Journal
REMOTE SENSING
Volume 14, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/rs14020406
Keywords
columnar aerosol optical properties; sun photometer; meteorological factors; hygroscopic growth; aerosol classification; aerosol long-range transportation; rural YRD
Categories
Funding
- National Natural Science Foundation of China [42176176]
- Guangxi Innovative Development Grand Grant [GuikeAA18118038]
- Land Observation Satellite Supporting Platform of the National Civil Space Infrastructure Project
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Accurate and updated aerosol optical properties are important for climate and environment-related studies. This study comprehensively analyzed AOP observations from a ground-based remote sensing instrument in Central China and used two classification methods to investigate aerosol types under different aerosol loadings. The results showed significant variation in aerosol optical depth during the daytime and throughout the year, with dominance of fine-mode aerosols with low absorptivity.
Accurate and updated aerosol optical properties (AOPs) are of vital importance to climatology and environment-related studies for assessing the radiative impact of natural and anthropogenic aerosols. We comprehensively studied the columnar AOP observations between January 2019 and July 2020 from a ground-based remote sensing instrument located at a rural site operated by Central China Comprehensive Experimental Sites in the center of the Yangtze River Delta (YRD) region. In order to further study the aerosol type, two threshold-based aerosol classification methods were used to investigate the potential categories of aerosol particles under different aerosol loadings. Based on AOP observation and classification results, the potential relationships between the above-mentioned results and meteorological factors (i.e., humidity) and long-range transportation processes were analyzed. According to the results, obvious variation in aerosol optical depth (AOD) during the daytime, as well as throughout the year, was revealed. Investigation into AOD, single-scattering albedo (SSA), and absorption aerosol optical depth (AAOD) revealed the dominance of fine-mode aerosols with low absorptivity. According to the results of the two aerosol classification methods, the dominant aerosol types were continental (accounting for 43.9%, method A) and non-absorbing aerosols (62.5%, method B). Longer term columnar AOP observations using remote sensing alongside other techniques in the rural areas in East China are still needed for accurate parameterization in the future.
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