Next Article in Journal
Optimal Decision Fusion for Urban Land-Use/Land-Cover Classification Based on Adaptive Differential Evolution Using Hyperspectral and LiDAR Data
Previous Article in Journal
Detection of Asian Dust Storm Using MODIS Measurements
Open AccessArticle

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

Division of Earth Environmental System Science Major of Spatial Information Engineering, Pukyong National University, Busan 608-737, Korea
Department of Atmosphere Science, Yonsei University, Seoul 03722, Korea
Harvard Smithonian Center for Astrophysics, Cambridge, MA 02421, USA
Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA
Goddard Space Flight Center, NASA, Greenbelt, MD 20771, USA
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Uwe Pfeifroth
Remote Sens. 2017, 9(8), 867;
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)
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
Show Figures

Graphical abstract

MDPI and ACS Style

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop