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長期衛星観測データから推定される雲エアロゾル相互作用
関口, 美保
Permalink : http://hdl.handle.net/2115/55031
Abstract
衛星解析から求められたエアロゾルと雲微物理量データを用いて, 両者の関係を統計的な手法を用いて解析することで雲エアロゾル相互作用の特性を調べた. 年変動より季節変動の方が大きいことから, 10年分のデータを集めて統計的に解析を行い, より精度の高い推定が可能になった. 鉛直積算エアロゾル数密度が109個/cm2より少ない範囲では,エアロゾルと雲の有効粒径は負の強い相関が, 光学的厚さとは正の強い相関が見られ, どちらも間接効果が現れていると考えられる. 鉛直積算エアロゾル数密度が109個/cm2より多い範囲では少ない範囲と逆の相関が現れるケースがみられた. これらの相互作用の季節変動及び地域変動を調べ, 夏期より冬期, 南半球より北半球の方が大きいことがわかった.
The present study investigated the correlations between aerosol and cloud parameters derived from satellite remote sensing to estimate properties of aerosol-cloud interactions. In this study, better evaluations are achieved to use monthly data from 2001 to 2010 at once, because seasonal variations are smaller than annual ones. The global statistics showed that effective particle radius and optical thickness of low clouds correlate well with column number concentration of the aerosol particles in small amount of aerosol loading in the atmosphere (about Na<109 (particles/cm2)), indicating aerosol indirect effects. In case of turbid atmosphere, inverse trends between aerosol and cloud microphysics parameters are appeared. Those regression slopes are steeper in winter than summer, and in northern than southern hemisphere, derived seasonal and regional statistics analyses.
The present study investigated the correlations between aerosol and cloud parameters derived from satellite remote sensing to estimate properties of aerosol-cloud interactions. In this study, better evaluations are achieved to use monthly data from 2001 to 2010 at once, because seasonal variations are smaller than annual ones. The global statistics showed that effective particle radius and optical thickness of low clouds correlate well with column number concentration of the aerosol particles in small amount of aerosol loading in the atmosphere (about Na<109 (particles/cm2)), indicating aerosol indirect effects. In case of turbid atmosphere, inverse trends between aerosol and cloud microphysics parameters are appeared. Those regression slopes are steeper in winter than summer, and in northern than southern hemisphere, derived seasonal and regional statistics analyses.
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