NDLI: Retrieval of Black Carbon Absorption Aerosol Optical Depth from AERONET Observations over the World during 2000–2018

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Retrieval of Black Carbon Absorption Aerosol Optical Depth from AERONET Observations over the World during 2000–2018

Content Provider	MDPI
Author	Dehkhoda, Naghmeh Sim, Juhyeon Joo, Sohee Shin, Sungkyun Noh, Youngmin
Copyright Year	2022
Description	Black carbon (BC) absorption aerosol optical depth $(AAOD_{BC}$) defines the contribution of BC in light absorption and is retrievable using sun/sky radiometer measurements provided by Aerosol Robotic Network (AERONET) inversion products. In this study, we utilized AERONET-retrieved depolarization ratio (DPR, $δp$ ), single scattering albedo (SSA, ω), and Ångström Exponent (AE, å) of version 3 level 2.0 products as indicators to estimate the contribution of BC to the absorbing fractions of AOD. We applied our methodology to the AERONET sites, including North and South America, Europe, East Asia, Africa, India, and the Middle East, during 2000–2018. The long-term $AAOD_{BC}$ showed a downward tendency over Sao Paulo (−0.001 $year^{−1}$), Thessaloniki (−0.0004 $year^{−1}$), Beijing (−0.001 $year^{−1}$), Seoul (−0.0015 $year^{−1}$), and Cape Verde (−0.0009 $year^{−1}$) with the highest values over the populous sites. This declining tendency in $AAOD_{BC}$ can be attributable to the successful emission control policies over these sites, particularly in Europe, America, and China. The $AAOD_{BC}$ at the Beijing, Sao Paulo, Mexico City, and the Indian sites showed a clear seasonality indicating the notable role of residential heating in BC emissions over these sites during winter. We found a higher correlation between $AAOD_{BC}$ and fine mode AOD at 440 nm at all sites except for Beijing. High pollution episodes, BC emission from different sources, and aggregation properties seem to be the main drivers of higher $AAOD_{BC}$ correlation with coarse particles over Beijing.
Starting Page	1510
e-ISSN	20724292
DOI	10.3390/rs14061510
Journal	Remote Sensing
Issue Number	6
Volume Number	14
Language	English
Publisher	MDPI
Publisher Date	2022-03-21
Access Restriction	Open
Subject Keyword	Remote Sensing Imaging Science Aerosol Optical Depth (aod) Absorption Aerosol Optical Depth (aaod) Black Carbon (bc) Ångström Exponent (ae, Å) Single Scattering Albedo (ssa, Ω) Depolarization Ratio (dpr, Δp)
Content Type	Text
Resource Type	Article

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