| 硫酸盐气溶胶直接辐射效应对东亚副热带季风进程的影响 |
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| 引用本文： | 王东东,朱彬,江志红,杨修群.硫酸盐气溶胶直接辐射效应对东亚副热带季风进程的影响[J].大气科学,2014,38(5):897-908. |
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| 作者姓名： | 王东东 朱彬 江志红 杨修群 |
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| 作者单位： | 1.南京信息工程大学气象灾害预报预警与评估协同创新中心, 南京 210044 |
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| 基金项目： | 国家重点基础研究发展计划项目2010CB428505，江苏省高校自然科学研究重大基础研究项目12KJA170003，江苏省“333”高层次人才培养工程，江苏省“六大人才高峰”计划，江苏省2011 年度普通高校研究生科研创新计划项目CXLX11_0620 |
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| 摘 要： | 本文利用全球气候—大气化学模式CAM5 并结合NCEP/NCAR（National Centers for EnvironmentalPrediction/National Center for Atmospheric Research）1950～2009 年再分析资料，讨论硫酸盐气溶胶直接辐射效应对东亚副热带季风爆发、发展和结束进程的影响。模拟结果表明:硫酸盐气溶胶通过直接辐射效应引起东亚大陆大部分地区近地面降温，进而降低了中纬度东亚大陆与西太平洋之间的纬向热力对比，延迟春初、提早夏末海陆纬向热力差异逆转时间，由此引发东亚副热带季风爆发时间延后了4 候左右，结束时间提前了3 候左右；减小的海陆热力差异导致东亚大陆偏南风减弱、东亚季风减弱以及季风降水的区域调整。我们通过NCEP/NCAR 再分析资料分析亦发现，1980 年以后中纬度东亚大陆与西太平洋之间的纬向热力差异逆转时间比1980 年以前在春初延迟、夏末提前，导致了副热带季风爆发时间比1980 年之前延后，结束时间提前，东亚大陆偏南风减弱，副热带夏季风系统性减弱，硫酸盐直接辐射效应可能是造成这一结果的原因之一。以往的观测和模拟都表明，由于人为活动的增加，导致1980 年后东亚大陆硫酸盐气溶胶负荷较之前大幅增加，而东亚夏季风减弱，本文的研究进一步确认了两者间关系。
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| 关 键 词： | 东亚副热带季风 硫酸盐气溶胶 直接效应 |
| 收稿时间： | 2013/6/11 0:00:00 |
| 修稿时间： | 2014/2/11 0:00:00 |
Direct Effect of Sulfate Aerosols on the Process of the East Asian Subtropical Monsoon |
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| WANG Dongdong,ZHU Bin,JIANG Zhihong and YANG Xiuqun.Direct Effect of Sulfate Aerosols on the Process of the East Asian Subtropical Monsoon[J].Chinese Journal of Atmospheric Sciences,2014,38(5):897-908. |
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| Authors: | WANG Dongdong ZHU Bin JIANG Zhihong and YANG Xiuqun |
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| Institution: | 1.Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 2100442.Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 2100443.School of Atmospheric Sciences, Nanjing University, Nanjing 210093 |
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| Abstract: | The direct effect of sulfate aerosols on the process of the East Asian subtropical monsoon was investigated using the interactive global climate-chemistry model version 5 of the Community Atmosphere Model combined with the NCEP/NCAR reanalysis dataset. The simulation results suggest that the surface temperature in most parts of the East Asian land has decreased, and the zonal thermal difference between the East Asian mid-latitude land and the western Pacific has weakened. The reversal time of the land-sea zonal thermal difference is later/earlier in early spring/late summer, and the onset/retreat times of the subtropical monsoon have been shifted to later/earlier by approximately 3 pentads because of the direct radiation effect of sulfate aerosols. The decreasing land-sea zonal thermal difference has led to the weakening of the south wind over the East Asian land and the East Asian monsoon, and a regional adjustment in monsoon rainfall. The results also imply that the reversal time of the land-sea zonal thermal difference between the East Asian mid-latitude land and the western Pacific after 1980 is later/earlier in early spring/late summer than before 1980 from the analysis of the NCEP/NCAR reanalysis data, leading to a/an later/earlier onset/retreat of the subtropical monsoon, weakening of the south wind over the East Asian land, and weakening of the subtropical monsoon after 1980. The sulfate aerosol direct radiation effect is likely to be one of the causes of this result. Both previous observational and model studies have shown that the sulfate aerosol loading increased markedly in the East Asian land after 1980 as a result of human activity, and the East Asian monsoon weakened. This study further confirms the relationship between them. |
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| Keywords: | East Asian subtropical monsoon Sulfate aerosol Direct effect |
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