Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products
Solar ultraviolet (UV) radiation plays a significant role in climate, atmospheric chemical processes, and ecosystem balance. Aerosol optical depth (AOD) at UV wavelengths, the UV-AOD, is an important quantity for studying the extinction of UV radiation in the atmosphere. Ground-based UV-AOD observat...
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ftpekinguniv:oai:localhost:20.500.11897/148478 2023-05-15T13:07:12+02:00 Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products Li, Qian Li, Chengcai Mao, Jietai Li, CC (reprint author), Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, Beijing 100871, Peoples R China. Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. 2012 https://hdl.handle.net/20.500.11897/148478 https://doi.org/10.1080/02786826.2012.687475 en eng aerosol science and technology AEROSOL SCIENCE AND TECHNOLOGY.2012,46,(9),1025-1034. 890149 0278-6826 http://hdl.handle.net/20.500.11897/148478 1521-7388 doi:10.1080/02786826.2012.687475 WOS:000304670000008 EI SCI OZONE MONITORING INSTRUMENT CLIMATE-CHANGE RADIATION AERONET SPACE VARIABILITY VALIDATION ECOSYSTEMS RETRIEVAL RADIANCES Journal 2012 ftpekinguniv https://doi.org/20.500.11897/148478 https://doi.org/10.1080/02786826.2012.687475 2021-08-01T07:58:26Z Solar ultraviolet (UV) radiation plays a significant role in climate, atmospheric chemical processes, and ecosystem balance. Aerosol optical depth (AOD) at UV wavelengths, the UV-AOD, is an important quantity for studying the extinction of UV radiation in the atmosphere. Ground-based UV-AOD observations, such as those from the AErosol RObotic NETwork (AERONET), are limited in spatial coverage. Current space derived UV-AOD from the Total Ozone Mapping Spectrometer (TOMS) or the Ozone Monitoring Instrument (OMI), on the other hand, are subject to large errors associated with low resolution, cloud contamination, assumed height of aerosol layer, and low sensitivity to aerosols in the lower troposphere. In this study, a new UV-AOD product is derived for the year 2009 by extrapolating the Moderate Resolution Imaging Spectra-radiometer (MODIS) visible bands AOD product (VIS-AOD) to 380 and 340 nm. Results are evaluated against UV-AOD measurements taken at AERONET sites. Over the oceans, four extrapolating methods are investigated by using two to five wavelengths. The best result, which has a correlation coefficient (R) of 0.90 at both wavelengths and root mean square errors (RMSE) of 0.062 and 0.068 at 380 and 340 nm, respectively, is achieved by combining a linear-extrapolation and a second-order polynomial fitting that takes into account the wavelength dependence of the Angstrom exponent. Moreover, more than 80% of the data fall within the uncertainty range of +/- 0.05 +/- 0.20 tau. Over land, UV-AOD is extrapolated using the Angstrom exponent derived from VIS-AODs at 470 and 660 nm, the only two wavelengths available from the MODIS AOD product. Compared with AERONET observations, the correlation coefficient is about 0.90 at both 380 and 340 nm, while the RMSE increases to 0.152 at 380 nm and 0.174 at 340 nm, due to the larger uncertainty of MODIS AOD over land. With the relatively low biases, this UV-AOD product will be valuable for climate and atmospheric chemistry research. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000304670000008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Engineering, Chemical Engineering, Mechanical Environmental Sciences Meteorology & Atmospheric Sciences SCI(E) EI 5 ARTICLE 9 1025-1034 46 Journal/Newspaper Aerosol Robotic Network Peking University Institutional Repository (PKU IR) Aerosol Science and Technology 46 9 1025 1034 |
institution |
Open Polar |
collection |
Peking University Institutional Repository (PKU IR) |
op_collection_id |
ftpekinguniv |
language |
English |
topic |
OZONE MONITORING INSTRUMENT CLIMATE-CHANGE RADIATION AERONET SPACE VARIABILITY VALIDATION ECOSYSTEMS RETRIEVAL RADIANCES |
spellingShingle |
OZONE MONITORING INSTRUMENT CLIMATE-CHANGE RADIATION AERONET SPACE VARIABILITY VALIDATION ECOSYSTEMS RETRIEVAL RADIANCES Li, Qian Li, Chengcai Mao, Jietai Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
topic_facet |
OZONE MONITORING INSTRUMENT CLIMATE-CHANGE RADIATION AERONET SPACE VARIABILITY VALIDATION ECOSYSTEMS RETRIEVAL RADIANCES |
description |
Solar ultraviolet (UV) radiation plays a significant role in climate, atmospheric chemical processes, and ecosystem balance. Aerosol optical depth (AOD) at UV wavelengths, the UV-AOD, is an important quantity for studying the extinction of UV radiation in the atmosphere. Ground-based UV-AOD observations, such as those from the AErosol RObotic NETwork (AERONET), are limited in spatial coverage. Current space derived UV-AOD from the Total Ozone Mapping Spectrometer (TOMS) or the Ozone Monitoring Instrument (OMI), on the other hand, are subject to large errors associated with low resolution, cloud contamination, assumed height of aerosol layer, and low sensitivity to aerosols in the lower troposphere. In this study, a new UV-AOD product is derived for the year 2009 by extrapolating the Moderate Resolution Imaging Spectra-radiometer (MODIS) visible bands AOD product (VIS-AOD) to 380 and 340 nm. Results are evaluated against UV-AOD measurements taken at AERONET sites. Over the oceans, four extrapolating methods are investigated by using two to five wavelengths. The best result, which has a correlation coefficient (R) of 0.90 at both wavelengths and root mean square errors (RMSE) of 0.062 and 0.068 at 380 and 340 nm, respectively, is achieved by combining a linear-extrapolation and a second-order polynomial fitting that takes into account the wavelength dependence of the Angstrom exponent. Moreover, more than 80% of the data fall within the uncertainty range of +/- 0.05 +/- 0.20 tau. Over land, UV-AOD is extrapolated using the Angstrom exponent derived from VIS-AODs at 470 and 660 nm, the only two wavelengths available from the MODIS AOD product. Compared with AERONET observations, the correlation coefficient is about 0.90 at both 380 and 340 nm, while the RMSE increases to 0.152 at 380 nm and 0.174 at 340 nm, due to the larger uncertainty of MODIS AOD over land. With the relatively low biases, this UV-AOD product will be valuable for climate and atmospheric chemistry research. http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000304670000008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 Engineering, Chemical Engineering, Mechanical Environmental Sciences Meteorology & Atmospheric Sciences SCI(E) EI 5 ARTICLE 9 1025-1034 46 |
author2 |
Li, CC (reprint author), Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, Beijing 100871, Peoples R China. Peking Univ, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies, Sch Phys, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. |
format |
Journal/Newspaper |
author |
Li, Qian Li, Chengcai Mao, Jietai |
author_facet |
Li, Qian Li, Chengcai Mao, Jietai |
author_sort |
Li, Qian |
title |
Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
title_short |
Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
title_full |
Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
title_fullStr |
Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
title_full_unstemmed |
Evaluation of Atmospheric Aerosol Optical Depth Products at Ultraviolet Bands Derived from MODIS Products |
title_sort |
evaluation of atmospheric aerosol optical depth products at ultraviolet bands derived from modis products |
publisher |
aerosol science and technology |
publishDate |
2012 |
url |
https://hdl.handle.net/20.500.11897/148478 https://doi.org/10.1080/02786826.2012.687475 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
EI SCI |
op_relation |
AEROSOL SCIENCE AND TECHNOLOGY.2012,46,(9),1025-1034. 890149 0278-6826 http://hdl.handle.net/20.500.11897/148478 1521-7388 doi:10.1080/02786826.2012.687475 WOS:000304670000008 |
op_doi |
https://doi.org/20.500.11897/148478 https://doi.org/10.1080/02786826.2012.687475 |
container_title |
Aerosol Science and Technology |
container_volume |
46 |
container_issue |
9 |
container_start_page |
1025 |
op_container_end_page |
1034 |
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1766040134316195840 |