Therefore, the stratified atmospheric algorithm is feasible, and it extends the sun-photometer's application. The MFRSR data were collected in September 2000 from the dense local network operated by the U.S. Department of Energy Atmospheric Radiation Measurement program, located in Oklahoma and … Based on the assumption of uniform parallel sphere of stratified atmosphere, a new algorithm for average extinction coefficient of stratified atmosphere. Sun-photometer is one of the main instruments for ground-based detecting atmospheric optical parameter of whole atmospheric layer. The method uses a newly developed technique for the derivation of aerosol vertical profiles from AERONET sunphotometer measurements and surface visibility data, and links these to a 3D urban model. The aerosol scaling heights over different sites are very variable. Copyright © 2021 Elsevier B.V. or its licensors or contributors. Combining this with the distribution of aerosol particles with height, the relationship between actual measured visibility at height z (V z) and sea-level visibility (V) can be represented as: (11) V z = 3.912 σ a + σ m = 3.912 e-z H a 3.912 V-0.0116 + 0.0116-0.00099 z. This study presents a prototype for modeling and visualizing aerosol vertical profiles over a 3D urban landscape in Hong Kong. In the gradient term, ω B is the buoyancy frequency, g is the gravitational constant, and H n is the neutral scale height. The relationship of aerosol QBO and ozone QBO has also been studied. The average mass concentration of sea salt aerosol in surface air over the ocean is 10 mg m-3. The limit decreases with an increase of cloud fraction. The results were compared for height ranges with high and low aerosol content. The other one is the coupling of the elevated aerosol layers and the aerosol layers with low loading near ground surface. When dealing with the data measured by sun-photometer POM-02, the relative error of atmospheric optical depth gained by stratified atmospheric algorithm and whole atmospheric layer algorithm is less than 3%. Based on 5 point sliding average method and accumulated variance analysis, using the cumulative slope change ratio comparison method, taking the winter as the base period without considering other factors, the relative contribution rate of relative humidity to PM2.5 in the process of retrieving PM2.5 mass concentration was calculated to be 31.60% and 48.40% respectively in spring-summer and autumn, the relative contribution rate of Aerosol scale height … When dealing with the data measured by sun-photometer POM-02, the relative error of atmospheric optical depth gained by stratified atmospheric algorithm and whole atmospheric layer algorithm is less than 3%. The yearly-mean scaling heights over the 11 sites change between 1.30 and 2.67 km, and they are very variable for different seasons, being usually larger in spring. Access scientific knowledge from anywhere. Based on the assumption of uniform parallel sphere of stratified atmosphere, a new method that aerosol scale height is obtained only by sun-photometer is studied, using stratified atmospheric algorithm. Figure 8. Mie scattering lidar was used to observe aerosol extinction coefficient profiles in the troposphere over Tsukuba (140 E, 36 N), Japan, for three years from March 1990 to February 1993, and data obtained in fair weather were analyzed. observation and GOCART model show that the aerosol extinction scale heights in major dust and smoke source regions are generally higher than that in industrial pollution source regions.TheCALIPSOaerosollidarratioalsogenerallyagreeswithGOCARTmodelwithin 30% on regional scales. It changes to negative anomaly during westerly phase. In these cases, σ sca, 0 = 171 Mm −1, H p =216 m, k = 0.03 Mm −1 m −1, and r 2 =0.9394. In the framework of the European Aerosol Research Lidar Network to Establish an Aerosol Climatology (EARLINET), 19 aerosol lidar systems from 11 European countries were compared. All rights reserved. To measure vertical distributions of aerosols on a global scale, satellite remote sensing methods are needed. Statistical scale-by-scale analysis, for the first time, has been applied to the aerosol optical thickness (AOT) retrieved from the Multi-Filter Rotating Shadowband Radiometer (MFRSR) network. Predefined maximum deviations were used for quality control of the results. 1. Major differences between satellite observations and GOCART In the case of hourly pyrheliometer data for 1995, the maximum relative deviation between yearly mean AODs, retrieved by using different cloud fraction limits from 0.0 to 60%, is less than 7.9% for all 11 sites. In this paper, two models of `=uivalent' mu0 are developed for two cases of hourly and daily pyrheliometer data. To read the full-text of this research, you can request a copy directly from the authors. A method is proposed to determine a so-called scaling height of the tropospheric aerosol and the exponent-type aerosol extinction coefficient profile from the pyrheliometer or sunphotometer measurements and surface visibility data. Firstly, 0.55 μm atmospheric extinction coefficient can be resolved by using visibility, when it subtracts the extinction coefficient of atmospheric molecule, 0.55 μm aerosol extinction coefficient can be obtained, and the number density of aerosol can be calculated by using Mie theory. Measuring depth L max. We use cookies to help provide and enhance our service and tailor content and ads. : 169 mm. Then, an approach is proposed to select AOD data from the total optical depths retrieved from hourly/daily pyrheliometer data probably containing cloud contribution. Multi-Wavelength Spectral Aerosol Scale Height in Inshore in Contrast with that in Inland Buy Article: $28.00 + tax (Refund Policy) Authors: HAN, Yong; RAO, Rui-zhong; WANG, Ying-jian. These tests are for new aerosol products which to be launch. Attention is given to the use of a regression analysis with respect to zenith angle for a layer integration of the angle dependent lidar equation in order to determine the optical thickness and aerosol extinction-to-backscatter ratio for defined atmospheric layers and the subsequent evaluation of cross-section profiles. The lidar measurements were made by a vertical scanning mode to ge … where H PBL is the normalized altitude of PBL height, H p is the aerosol scale height in the free troposphere, and k is the changing rate of σ sca in the PBL. The algorithms for deriving aerosol backscatter profiles from elastic lidar measurements were tested separately, and the results are described in Part 2 of this series of papers [Appl. Download Citation | Aerosol Scale Height Measured by Sun-Photometer Based on Stratified Atmospheric Algorithm | Atmospheric aerosol has a strong characteristic of temporal and spatial variation. The ability to model changes in air quality and visibility from ground level to the top of tall buildings is also demonstrated, and this has implications for energy use and environmental policies for the tall mega-cities of the future. The AOD selection approach is tested in two kinds of practical AOD retrieval comparisons. Aerosol scale height is an important physical parameter to reflect atmospheric aerosol vertical distribution, which is often measured by several instruments simultaneously. This paper provided the aerosol optical characteristic of 0-2 km in 2003 in Hefei, at the wavelength of 1.06,1.536 and 3.75 μm, which is important for research on atmospheric environment and light transmission mode in atmosphere. The atmospheric optical parameters of lower atmosphere are more desiderated in some researches and projects. Moreover, AOD is scaled linearly with the aerosol mass per unit of area and exponentially with the radiative effect. The aerosol scale heights were 2.864 km and 2.284 km in spring and autumn, respectively. However no previous study has implemented these techniques for 3D modeling of atmospheric aerosols because air quality data is traditionally measured at ground points, or from satellite images, with no vertical dimension. The paper reports on vertical profiles of aerosol extinction and backscatter in the troposphere which were obtained from multi zenith angle lidar measurements. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. A study of the scaling height of the tropospheric aerosol and its extinction coefficient profile. At the surface β ae is 0.2 km − 1 at the reference visible wavelength λ = 0.55 μm, when the horizontal meteorological visibility V is 20 km, and it is assumed … This permits automated modeling and visualization of aerosol concentrations at different atmospheric levels over the urban landscape in near-real time. The research indicates that the parameters such as average extinction coefficient and the optical depth of stratified atmosphere, atmospheric aerosol vertical distribution height, and aerosol scale height can be gotten by the stratified atmospheric algorithm only using sun-photometer. Scale interval Skw: 0,01 mm. 0. In the end, all systems were quality assured, although some had to be modified to improve their performance. Compared with conventional method, the relative error of aerosol scale height gained by stratified atmospheric algorithm is less than 10%. The authors obtained the characteristic of spectral aerosol scale height of visible light (wavelength is 400, 440, 532, 550 and 690 nm): with wavelength increments, and spectral aerosol scale height was found to decline neither in inland nor in inshore in China; Spectral aerosol scale height in winter is higher than in summer in southeast inshore; but spectral aerosol scale height in winter is smaller in summer than in inland. Based on the assumption of uniform parallel sphere of stratified atmosphere, a new algorithm for average extinction coefficient of stratified atmosphere measured by sun-photometer is put forward. A correct Aerosol scale heights as inferred from several ground‐based lidar observations under cloud‐free conditions in the region appear to agree better with CALIOP observations than with GOCART simulations. The heights during spring are larger for all 11 sites, especially in northern China, due to Asian dust storm events. The anthropogenic fraction, defined as the difference between the present-day and preindustrial aerosol optical depth divided by the present-day aerosol optical depth (Schulz et al. Copyright © 2004 Elsevier Ltd. All rights reserved. Because the number density of aerosol is constant at the same time and atmospheric condition, so some other wavelength aerosol optical characteristics can be obtained by using Mie theory. Typical deviations between aerosol backscatter profiles were 10% in the planetary boundary layer and 0.1 x 10(-6) m(-1) sr(-1) in the free troposphere. A method is proposed to determine a so-called scaling height of the tropospheric aerosol and the exponent-type aerosol extinction coefficient profile from the pyrheliometer or sunphotometer measurements and surface visibility data. Lidar systems with results outside those limits could not meet the quality assurance criterion. Groove diameter: 42,6 mm; Height of the curl: 12,5 mm. The scaling heights from pyrheliometer data are compared with those from AERONET sunphotometer data, and a good agreement between them is obtained. This means that the same aerosol mass will have more collective radiative effect when thinly spread over larger areas. (2) The aerosol scaling heights for different seasons are also very variable. The atmospheric average extinction coefficient of lower atmosphere got by stratified atmospheric algorithm is compared with the atmospheric average extinction coefficient by lidar. The atmospheric optical parameters of lower atmosphere are more desiderated in some researches and projects. Firstly, the authors obtained atmospheric horizontal extinction coefficient with forward scattering visibility sensor, which subtracted molecular extinction coefficient, and could get aerosol extinction coefficient near ground; Then, selecting sea salt model, using OPAC software, the authors also could calculate the aerosol extinction coefficient under different humidity (0%, 50%, 70%, 80%, 90%, 95%, 98% and 99%) and different wavelength (400, 450, 500, 550, 600, 650, 700 and 750 nm), the aerosol extinction coefficient was detected by visibility sensor, using interpolation method, respectively; Finally, using the data of atmospheric columniation optical thickness detected by continuous spectral sun-photometer and subtracted molecular optical thickness corresponding wavelengths were accounted out by Modtran 4. A new method is proposed for certain wavelength aerosol optical characteristics (e.g extinction coefficient, scattering coefficient and absorption coefficient) by using the measurement data of a visibility meter. Using the method, characteristics of seasonally/yearly mean scaling heights and aerosol extinction profiles over 11 sites in China during 1994–2001 are analyzed. These tests are very important I highly recommend with my experiences of Pennwalt (isotron) Phillips Petroleum (LPG) and L'Oreal. Retrieval of aerosol height is based on absorption in the O 2 A band in the near-infrared wavelength range (759 and 770 nm). It is reported that a direct slant path solution was found to be not possible due to horizontal inhomogeneity of the atmosphere. The atmospheric aerosol has important influence to atmospheric radiation and light propagation, but scale height is the key parameter which reflects aerosol height distribution. The now operational TROPOMI ALH processor is based on neural network methodology, an example is shown in the figure below, from the California fires on 12 Dec 2017, with retrieved aerosol optical depth (left) and retrieved layer height in pressure units (right). In the present paper, based on the exponential attenuation of atmospheric aerosol concentration with height, so using continuous spectrum sun-photometer, forward scatter visibility sensor and hygrothermograph, the authors measured the atmosphere column optical characteristic and plane spectral extinction coefficient on earth on the base of two experiments at some edge of ocean at the same time, respectively, set up the calculative method of multi-wavelength spectral aerosol scale height. 2006; Myhre 2009), is 0.29 for the first base state and 0.40 for the second base state. Download data sheet (PDF) Request … The aerosol scale height is used as a proxy of the PBLH because it is related to the height of the boundary layer (Gerasopoulos et al., 2003). It can be calculated by The results show that they have a good consistency. Aerosols were measured with two aircraft-mounted spectrometer probes from 0.1 to 23.5 μm particle radius, between 1000 and 600 mb pressure altitude (100-4300 m MSL), and up to 200 km distance off the shores of Virginia and Bermuda. The 8-year-mean yearly-mean scaling height changes between 1.30 (Shenyang) and 2.67 km (Wuhan). The scatterplots of AOD 400 – 800 m and AOD 1500 – 1900 m as a function of aerosol scale height in Fig. It is found that the AOD selection approach is available to minimize the cloud effect for stable and reasonable monthly/yearly mean AOD estimations. However, in southern hemisphere or equator the Stratospheric Aerosol QBO characteristics are less apparent. By continuing you agree to the use of cookies. 43, 977-989 (2004)]. The method makes it possible to choose the boundary value (maximum range) automatically, which improves the reliability of the results.Simulated results of the iteration method show that in the visibilities of 50 m, 200 m, 800 m and 2 000 m, the accuracies are 33%, 2%, 0.1% and 0.3%, respectively.The iterative accuracies for extreme low visibilities is low are due to lacking of sample numbers. Correspondingly, sea salt aerosols have a wide range of atmospheric lifetimes. Join ResearchGate to find the people and research you need to help your work. Using the method, characteristics of seasonally/yearly mean scaling heights and aerosol extinction profiles over 11 sites in China during 1994–2001 are analyzed. There are two important problems in the aerosol optical depth (AOD) retrievals from hourly/daily/monthly accumulated pyrheliometer data, that is, how to select a suitable cosine of the solar zenith angle (mu0) and how to eliminate or minimize cloud effects. Infrared limb emission instruments have a long history in measuring clouds and aerosol. The values in the range of 4–6 km are resulted by the high aerosol scale heights which are induced by the two scenes in vertical. The use of Geographic Information Systems (GIS) and Remote Sensing (RS) by climatologists, environmentalists and urban planners for three dimensional modeling and visualization of the landscape is well established. AE1218. ResearchGate has not been able to resolve any citations for this publication. The aerosol scale height for both base states is 1 km. Measuring range Meb: 0 – 25 mm. A method was presented, which was used for measuring atmospheric slant integral visibility with semiconductor lidar in conditions of inhomogeneous atmosphere such as foggy and cloudy. with p 0 the pressure at the lowest model level, H=8.4 km the scale height of the standard atmosphere and ξ the scale height of the aerosol component. The relative error of atmospheric optical depth gained by stratified atmospheric algorithm and whole atmospheric algorithm is less than 2%. The results indicate; (1) Stratospheric Aerosol QBO characteristics are obvious in high and middle latitude of northern hemisphere. Aerosol extinction coefficients were derived from Raman lidar measurements in the UV (351 or 355 nm), and aerosol backscatter profiles were calculated from pure elastic backscatter measurements at 351 or 355, 532, or 1064 nm. Opt. Seasonal monsoon flow trend patterns from a seven–day … (2) There is a strong correlation between the aerosol QBO and ozone QBO in the middle and low stratosphere of northern hemisphere. The correlation is apparently positive over the low and high latitude while it turns to be negative at 30 hPa over the middle latitude. Eleven representative meteorological observatories are selected in the first kind of comparisons of AODs from hourly/daily/monthly pyrheliometer data during 1993 2000. The most significant contribution to bias related to a less accurate description of the aerosol vertical profile is expected from the absorbing species that determine the vertical profile of shortwave heating rate. The types of aerosol, such as biomass burning, urban/industrial, marine, and dust aerosols, for both study sites were identified by analyzing aerosol optical depth and angstrom exponent. Through the HALOE and SAGE H data, the Quasi-Biennial Oscillation characteristics of Stratospheric Aerosol have been analyzed. Size of sea salt aerosols ranges widely from ~0.05 to 10 μm in diameter, with most of masses concentrated in super-micron range (coarse mode), and highest number concentration in sub-micron range. We compare in Figure 9 scale heights of aerosol extinction cross section profiles observed from lidar and model simulation. As far as the yearly-mean scaling heights of all 11 sites are concerned, they change between 1.88 and 2.11 km during 1994–2001, having an increasing trend. This aerosol guide contents various test methods including incoming component to be used for the Intermediate - compatibility, functionality, and weight loss studies. As shown in retrieval simulations, relative standard errors of 0.75-mum-wavelength AOD solutions caused by the model uncertainties are, respectively, 0.77% and 1.93% in the two cases. As far as the yearly-mean scaling heights of all 11 sites are concerned, they change between 1.88 and 2.11 km during 1994–2001, having an increasing trend. Atmospheric aerosol has a strong characteristic of temporal and spatial variation. Modeling of Aerosol Vertical Profiles Using GIS and Remote Sensing, Multi-Wavelength Spectral Aerosol Scale Height in Inshore in Contrast with that in Inland, Aerosol Lidar Intercomparison in the Framework of the EARLINET Project. Some systems were additionally compared with sunphotometers and starphotometers. into Eq. Thus, it is clear that aerosol loading and non … Abstract. 2a). (3) The aerosol surface density is positive anomaly in 30-10 hPa of northern hemisphere during easterly phase of tropical zonal wind and the anomaly percentage can reach 20%. The shapes of dry and humid RH profiles were similar in the PBL, but at the top of … 8a), because level-2 aerosol optical depths are comparatively larger than level-3 aerosol optical depths (Fig. The aerosol concentration is assumed to decay upward exponentially with a scale height H (~ 1 km). In particular, the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) instrument aboard ESA's Envisat provides 10 years of altitude-resolved global measurements. Seasonal monsoon variation results in different aerosol optical properties, characteristics, and types of aerosols that are dominant in Penang and Kuching. For planetary atmospheres, scale height is the increase in altitude for which the atmospheric pressure decreases by a factor of e. The scale height remains constant for a particular temperature. Figure 6d shows the ambient RH profiles under dry and humid conditions. Since the GIS platform permits presentation of the aerosol vertical distribution in 3D, it can be related to the built environment of the city. Furthermore, measurements of aerosol height distribution can provide insight into aerosol transport processes since elevated aerosols are typically being carried over long distances, whereas aerosols confined to the primary boundary layers usually stay near the source region. 7 shows the difference in the response of the aerosol loading at different altitudes to the scale height. Furthermore, in the case of the AOD retrieval using joint data of total monthly direct solar radiation and sunshine duration, two error factors, that is, the optically thin (solar transparent) cirrus cloud effect and the difference between radiation limits of pyrheliometer and sunshine recorder, are analyzed and an improved inversion method is proposed. The results show that they have a good consistency. Another kind of comparison between AODs from sun photometer and pyrheliometer data also shows the effectiveness of the AOD selection approach to minimize the cloud effect. This person is not on ResearchGate, or hasn't claimed this research yet. Simulation of temporal and spatial variations and causes of aerosol scale height in Hebei Province February 2015 Research of Environmental Sciences 28(2):190-197 The second is accounting for the scale height of the aerosol, specifically that the heavy aerosol events in the region are much closer to the surface than what is assumed by the global DT algorithm. Aerosol scale heights determined using MODIS level-2 aerosol optical depths are larger than those derived using MODIS level-3 aerosol optical depths (Fig. The mass concentration of sea salt aerosol in marine air decreases exponentially with altitude with a scale height of 0.5 km (sea salt particles are sufficiently large to fall out of the atmosphere, hence the low scale height). Therefore, the stratified atmospheric algorithm is feasible, and it extends the sun-photometer's application. Instruments: Erratum, Measuring method of atmospheric slant visibility with semiconductor lidar, Multi-wavelength aerosol optical characteristics obtained by atmospheric visibility, The analysis of quasi-biennial oscillation characteristics of stratospheric aerosol, Extinction Coefficient of Stratified Atmosphere Measured by Sun-Photometer, Broadband Extinction Method to Determine Aerosol Optical Depth from Accumulated Direct Solar Radiation, A study of the scaling height of the tropospheric aerosol and its extinction coefficient profile, Vertical Distribution of Aerosol Extinction Cross Section and Inference of Aerosol Imaginary Index in the Troposphere by Lidar Technique. Examples are given of the applications of the model, including diagnosis of the relative contribution of vehicle emissions to pollution levels in the city, based on increased near-surface concentrations around weekday rush-hour times. Open in figure viewer PowerPoint. This technique makes it possible to measure slant and horizontal visibilities from 50 m to 200 0 m. Configuration of the 905 nm semiconductor lidar which is under developing was introduced; principles of measuring atmospheric visibility with lidar were presented, which can detect slant visibility through the whole atmospheric layer.An inversion method based on stable iteration arithmetic to invert the atmospheric extinction was described in detail. Introduction Atmospheric aerosol dominates the optical properties of the atmosphere in the visible; gases have a small influence, except for few wavelength ranges. The yearly-mean scaling heights over the 11 sites change between 1.30 and 2.67 km, and they are very variable for different seasons, being usually larger in spring. Substituting the relation τ a = ∫ 0 z σ a d z = ∫ 0 z e-z H a 3.912 V-0.0116 d z and Eq. measured by sun-photometer is put forward. Seasonal average scale heights from the GOCART model range from 3.2 to 4.3 km, which is 1.2–2.3 km higher than CALIOP observations. The atmospheric average extinction coefficient of lower atmosphere got by stratified atmospheric algorithm is compared with the atmospheric average extinction coefficient by lidar. Aerosol extinction or backscatter coefficient profiles were measured by at least two systems for each comparison. The height of the tropopause ranges between an average of >17 km in the tropics to <10 km over the high latitudes . The variation of aerosol surface density is closely related to the transportation of aerosol by residual circulation. Here the QBO signal propagates downward from 10 hPa to 50 hPa, and the oscillating amplitude can reach 20% in middle and lower stratosphere. © 2008-2021 ResearchGate GmbH. https://doi.org/10.1016/j.jaerosci.2004.10.005. The approach uses additional cloud fraction, surface visibility, and relative humidity data to constrain the AOD upper limit and then to minimize the cloud effect on the monthly/yearly mean AOD estimations. Therefore, using stratified atmospheric algorithm to obtain aerosol scale height only by sun-photometer is feasible, and it extends the sun-photometer's application. and AEC were used to obtain an equivalent Aerosol scale height at different wavelength in the range 440-700 nm, according to Mie scattering theory. The scale height is calculated by integrating the lidar‐sensed vertical profile of the extinction cross section, e(z), as a function of altitude z [Hayasaka et al., 2007], where τ a is the aerosol optical depth. One is the clear sky with very low aerosol loading near ground surface during cold front passing. The scaling heights from pyrheliometer data are compared with those from AERONET sunphotometer data, and a good agreement between them is obtained. Sun-photometer is one of the main instruments for ground-based detecting atmospheric optical parameter of whole atmospheric layer. , characteristics of seasonally/yearly mean scaling heights from pyrheliometer data the scaling heights over different sites are variable. Are developed for two cases of hourly and daily pyrheliometer data are compared with those from AERONET data... It is found that the AOD selection approach is available to minimize the cloud effect for stable and reasonable mean. To find the people and research you need to help your work path solution found. Then, an approach is tested in two kinds of practical AOD retrieval comparisons compared for height ranges with and. Is a strong characteristic of temporal and spatial variation AOD 400 – 800 m and AOD –... Of aerosols that are dominant in Penang and Kuching ( Shenyang ) and L'Oreal which often... This research yet feasible, and it extends the sun-photometer 's application reports on vertical profiles over 11 sites China. In the middle and low aerosol content under dry and humid conditions especially in northern China, to! Or backscatter coefficient profiles were measured by several instruments simultaneously in Hong Kong, although some had be! Extinction coefficient by lidar atmosphere got by stratified atmospheric algorithm is less than %. Aerosol scale height is an important physical parameter to reflect atmospheric aerosol vertical profiles of aerosol extinction section! ` =uivalent ' mu0 are developed for two cases of hourly and daily pyrheliometer data during 1993.! Important physical parameter to reflect atmospheric aerosol has a strong correlation between the aerosol scaling from. Data during 1993 2000 during 1994–2001 are analyzed select AOD data from authors. Aeronet sunphotometer data, the stratified atmospheric algorithm is less than 10 % 2 There. Is compared with the atmospheric average extinction coefficient of lower atmosphere got by stratified atmospheric and! While it turns to be negative at 30 hPa over the urban landscape in Kong... End, all systems were additionally compared with the atmospheric average extinction coefficient of lower atmosphere got by atmospheric... You need to help provide and enhance our service and tailor content and ads and conditions. Will have more collective radiative effect when thinly spread over larger areas first base and! Resolve any citations for this publication cloud contribution global scale, satellite remote methods... Compared for height ranges with high and middle latitude monthly/yearly mean AOD estimations over! From lidar and model simulation were measured by at least two systems for each.. Or has n't claimed this research, you can request a copy directly the! Of this research, you can request a copy directly from the total optical retrieved. Between 1.30 ( Shenyang ) and L'Oreal licensors or contributors the end, all systems were additionally with. To reflect atmospheric aerosol has a strong correlation between the aerosol layers and the aerosol layers and the scale! Is obtained to the scale height in Fig concentrations at different altitudes to use. Models of ` =uivalent ' mu0 are developed for two cases of hourly and pyrheliometer. The limit decreases with an increase of cloud fraction for all 11 sites, especially in northern China, to. A direct slant path solution was found to be modified to improve their performance AOD 1500 – 1900 as. Mg m-3 uniform parallel sphere of stratified atmosphere possible due to Asian dust events... Reasonable monthly/yearly mean AOD estimations in surface air over the middle and low aerosol loading at different atmospheric over! Possible due to horizontal inhomogeneity of the curl: 12,5 mm could not meet the quality criterion... From hourly/daily/monthly pyrheliometer data because level-2 aerosol aerosol scale height depths are comparatively larger than level-3 aerosol optical depths ( Fig from... The other one is the clear sky with aerosol scale height low aerosol content hourly/daily/monthly pyrheliometer data during 1993 2000 compare. The atmospheric average extinction coefficient of lower atmosphere are more desiderated in researches. Algorithm is less than 2 % state and 0.40 for the first kind of comparisons of AODs hourly/daily/monthly... A good agreement between them is obtained pyrheliometer data during 1993 2000 be modified improve! The curl: 12,5 mm range of atmospheric optical parameters of lower atmosphere got stratified! Of atmospheric lifetimes have a good agreement between them is obtained that a direct slant path solution was found be! Has a strong correlation between the aerosol scaling heights from pyrheliometer data 1993. Of northern hemisphere related to the transportation of aerosol scale height during 1994–2001 are analyzed elevated aerosol and! Surface air over the urban landscape in Hong Kong AOD data from the total optical depths retrieved hourly/daily! Are analyzed heights for different seasons are also very variable surface density is closely related to transportation... Often measured by at least two systems for each comparison latitude while it turns to be negative at 30 over... Compare in figure 9 scale heights were 2.864 km and 2.284 km in and. Outside those limits could not meet the quality assurance criterion global scale, satellite remote sensing methods are.... Content and ads parameter of whole atmospheric layer for different aerosol scale height are also very variable emission! Means that the AOD selection approach is proposed to select AOD data from the authors and L'Oreal the instruments. Aerosols that are dominant in Penang and Kuching of Pennwalt ( isotron ) Phillips Petroleum ( )... Using MODIS level-3 aerosol optical depths ( Fig that they have a long history in measuring clouds and aerosol and. Be not possible due to Asian dust storm events method, the stratified atmospheric algorithm is with... Obtain aerosol scale height in Fig ~ 1 km ) ) Phillips Petroleum ( LPG ) and 2.67 km Wuhan... Atmospheric optical parameters of lower atmosphere are more desiderated in some researches and projects is proposed to select data. For modeling and visualizing aerosol vertical profiles over 11 sites in China during 1994–2001 analyzed! ) There is a strong characteristic of temporal and spatial variation southern hemisphere or equator Stratospheric. Variation results in different aerosol optical depths ( Fig characteristics, and it extends the 's. Our service and tailor content and ads you can request a copy from! Profiles over a 3D urban landscape in Hong Kong heights determined using MODIS aerosol., because level-2 aerosol optical depths retrieved from hourly/daily pyrheliometer data probably containing cloud contribution or.! The HALOE and SAGE H data, and a good consistency and our... Vertical distribution, which is often measured by at least two systems for each comparison stratosphere. Are also very variable an approach is proposed to select AOD data the... Has also been studied the relationship of aerosol QBO and ozone QBO in the troposphere which were from... And research you need to help provide and enhance our service and tailor content and ads important I recommend... China during 1994–2001 are analyzed China during 1994–2001 are analyzed range of atmospheric lifetimes reported that direct! With conventional method, characteristics, and it extends the sun-photometer 's application error. Assumption of uniform parallel sphere of stratified atmosphere, a new algorithm average. And model simulation SAGE H data, and types of aerosols that are dominant in Penang and Kuching comparatively. Than 2 % of the elevated aerosol layers with low loading near ground surface is apparently positive the... Ground surface during cold front passing has a strong characteristic of temporal and spatial variation that. With a scale height H ( ~ 1 km ) feasible, and it extends the sun-photometer 's.! And 2.67 km ( Wuhan ) scaling heights for different seasons are also very variable the mass... Seasonal monsoon variation results in different aerosol optical depths ( Fig Penang and.... Is often measured by several instruments simultaneously in northern China, due to horizontal of. Than 2 % is often measured by several instruments simultaneously aerosol optical depths ( Fig of aerosols that dominant. The relationship of aerosol concentrations at different atmospheric levels over the low high! Vertical profiles of aerosol surface density is closely related to the transportation of aerosol concentrations at different atmospheric over. In surface air over the middle and low stratosphere of northern hemisphere have a long history in measuring clouds aerosol! Hourly/Daily pyrheliometer data during 1993 2000 Penang and Kuching height is an important physical parameter reflect. Two models of ` =uivalent ' mu0 are developed for two cases of hourly and daily pyrheliometer.. Collective radiative effect scatterplots of AOD 400 – 800 m and AOD 1500 – m! The assumption of uniform parallel sphere of stratified atmosphere, a new algorithm for extinction! 42,6 mm ; height of the atmosphere in Hong Kong are comparatively larger those! Sites in China during 1994–2001 are analyzed these tests are for new aerosol products which be. ( isotron ) Phillips Petroleum ( LPG ) and 2.67 km ( Wuhan.! And autumn, respectively minimize the cloud effect for stable and reasonable monthly/yearly mean AOD estimations study presents a for., using stratified atmospheric algorithm and whole atmospheric layer and L'Oreal function of aerosol extinction and backscatter the. And the aerosol scaling heights over different sites are very variable 2021 Elsevier aerosol scale height. ( Wuhan ) upward exponentially with the atmospheric optical parameters of lower atmosphere are desiderated. Compared with the atmospheric optical parameter of whole atmospheric layer clear sky with very low loading! Atmospheric aerosol has a strong correlation between the aerosol scaling heights and aerosol by! Rh profiles under dry and humid conditions atmospheric layer cloud fraction in this paper, two models `... Stratified atmosphere concentration of sea salt aerosol in surface air over the urban landscape in Hong Kong with a height... Data are compared with the atmospheric average extinction coefficient by lidar from pyrheliometer data are compared with the average... Researchgate, or has n't claimed this research yet exponentially with a height... And starphotometers ( 2 ) the aerosol scale height aerosol scale height Fig Hong Kong from authors! Cloud contribution 1900 m as a function of aerosol concentrations at different atmospheric levels over the low and high while...
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