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Remote Sens. 2017, 9(8), 867; https://doi.org/10.3390/rs9080867

The Effects of Aerosol on the Retrieval Accuracy of NO2 Slant Column Density

1
Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University, Busan 608-737, Korea
2
Department of Atmosphere Science, Yonsei University, Seoul 03722, Korea
3
Harvard Smithonian Center for Astrophysics, Cambridge, MA 02421, USA
4
Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
5
Goddard Space Flight Center, NASA, Greenbelt, MD 20771, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Uwe Pfeifroth
Received: 27 July 2017 / Revised: 16 August 2017 / Accepted: 19 August 2017 / Published: 22 August 2017
(This article belongs to the Section Atmosphere Remote Sensing)
Full-Text   |   PDF [5375 KB, uploaded 22 August 2017]   |  

Abstract

We investigate the effects of aerosol optical depth (AOD), single scattering albedo (SSA), aerosol peak height (APH), measurement geometry (solar zenith angle (SZA) and viewing zenith angle (VZA)), relative azimuth angle, and surface reflectance on the accuracy of NO2 slant column density using synthetic radiance. High AOD and APH are found to decrease NO2 SCD retrieval accuracy. In moderately polluted (5 × 1015 molecules cm−2 < NO2 vertical column density (VCD) < 2 × 1016 molecules cm−2) and clean regions (NO2 VCD < 5 × 1015 molecules cm−2), the correlation coefficient (R) between true NO2 SCDs and those retrieved is 0.88 and 0.79, respectively, and AOD and APH are about 0.1 and is 0 km, respectively. However, when AOD and APH are about 1.0 and 4 km, respectively, the R decreases to 0.84 and 0.53 in moderately polluted and clean regions, respectively. On the other hand, in heavily polluted regions (NO2 VCD > 2 × 1016 molecules cm−2), even high AOD and APH values are found to have a negligible effect on NO2 SCD precision. In high AOD and APH conditions in clean NO2 regions, the R between true NO2 SCDs and those retrieved increases from 0.53 to 0.58 via co-adding four pixels spatially, showing the improvement in accuracy of NO2 SCD retrieval. In addition, the high SZA and VZA are also found to decrease the accuracy of the NO2 SCD retrieval. View Full-Text
Keywords: NO2; slant column density; DOAS method; aerosol properties; aerosol peak height NO2; slant column density; DOAS method; aerosol properties; aerosol peak height
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hong, H.; Kim, J.; Jeong, U.; Han, K.-S.; Lee, H. The Effects of Aerosol on the Retrieval Accuracy of NO2 Slant Column Density. Remote Sens. 2017, 9, 867.

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