CAJ | 학술논문

运用区域气候模式RegCM4.0（Regional Climate Model Verson 4.0）耦合入一个化学过程，对硫酸盐、黑碳、有机碳这3种人为气溶胶的时空分布特征和直接辐射效应进行了数值模拟，进而研究了气溶胶对南亚冬季风的影响。结果表明：光学厚度和地表短波辐射强迫的时空变化可能主要受硫酸盐气溶胶的影响。在南亚夏季风向冬季风转换时期和南亚冬季风盛行时期，大气层顶和地表的负短波辐射强迫分布与气溶胶分布基本一致，地表辐射强迫强度绝对值比大气层顶辐射强迫强度绝对值大得多。相关分析和合成分析表明：在南亚夏季风向冬季风转换时期和南亚冬季风盛行时期，南亚人为气溶胶主要分布区中的气溶胶柱浓度含量与南亚冬季风的建立和强度有反相关关系。这与气溶胶吸收太阳辐射，从而引起气温和位势高度的变化有关。
운용구역기후모식RegCM4.0（Regional Climate Model Verson 4.0）우합입일개화학과정，대류산염、흑탄、유궤탄저3충인위기용효적시공분포특정화직접복사효응진행료수치모의，진이연구료기용효대남아동계풍적영향。결과표명：광학후도화지표단파복사강박적시공변화가능주요수류산염기용효적영향。재남아하계풍향동계풍전환시기화남아동계풍성행시기，대기층정화지표적부단파복사강박분포여기용효분포기본일치，지표복사강박강도절대치비대기층정복사강박강도절대치대득다。상관분석화합성분석표명：재남아하계풍향동계풍전환시기화남아동계풍성행시기，남아인위기용효주요분포구중적기용효주농도함량여남아동계풍적건립화강도유반상관관계。저여기용효흡수태양복사，종이인기기온화위세고도적변화유관。
The spatial-temporal distribution and direct radiative effect of three anthropogenic aerosols (sulfate, black carbon, and organic carbon) were simulated by using the regional climate model RegCM4.0 (Regional Climate Model verson 4.0) coupled with a chemistry module. Results from our investigation of the effect of aerosols on the South Asian winter monsoon show that the temporal and spatial changes in optical depth and surface short wave radiative forcing may be caused primarily by the sulfate aerosol. In the transition period between the South Asian summer and winter monsoons and during the prevailing South Asian winter monsoon, the distributions of negative short wave radiative forcing at the top of the atmosphere and at the surface are nearly consistent with the distribution of the aerosols. The absolute value of the intensity of the radiative forcing at the surface is much greater than its intensity at the top of the atmosphere. Correlation and composite analyses show that the aerosols’ column burdens in the main distribution area of anthropogenic aerosols in South Asia is negatively correlated with the onset and intensity of the South Asian winter monsoon in the transition period between the South Asian summer and winter monsoons and during the prevailing South Asian winter monsoon.These effects may be attributed to the fact that aerosols absorb solar radiation, thereby inducing the changes in temperature and geopotential height.