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KMID : 1024520200290111065
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Journal of the Environmental Sciences
2020 Volume.29 No. 11 p.1065 ~ p.1078
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Investigating Statistical Characteristics of Aerosol?Cloud Interactions over East Asia retrieved from MODIS Satellite Data
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Jung Woon-Seon
Sung Hyun-Min
Lee Dong-In
Cha Joo-Wan
Chang Ki-Ho
Lee Chul-Kyu
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Abstract
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The statistical characteristics of aerosol?cloud interactions over East Asia were investigated using Moderate Resolution Imaging Spectroradiometer satellite data. The long-term relationship between various aerosol and cloud parameters was estimated using correlation analysis, principle component analysis, and Aerosol Indirect Effect (AIE) estimation. In correlation analysis, Aerosol Optical Depth (AOD) was positively Correlated with Cloud Condensation Nuclei (CCN) and Cloud Fraction (CF), but negatively correlated with Cloud Top Temperature (CTT) and Cloud Top Pressure (CTP). Fine Mode Fraction (FMF) and CCN were positively correlated over the ocean because of sea spray. In principle component analysis, AOD and FMF were influenced by water vapor. In particular, AOD was positively influenced by CF, and negatively by CTT and CTP over the ocean. In AIE estimation, the AIE value in each cloud layer and type was mostly negative (Twomey effect) but sometimes positive (anti-Twomey effect). This is related to regional, environmental, seasonal, and meteorological effects. Rigorous and extensive studies on aerosol?cloud interactions over East Asia should be conducted via micro- and macro-scale investigations, to determine chemical characteristics using various meteorological instruments.
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KEYWORD
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Correlation analysis, Principle component analysis, Aerosol indirect effect, Aerosol, Cloud
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