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Simulation of the anthropogenic aerosols over South Asia and their effects on Indian summer monsoon

机译：南亚人为气溶胶的模拟及其对印度夏季风的影响

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摘要

A regional climate model coupled with a chemistry-aerosol model is employed to simulate the anthropogenic aerosols including sulfate, black carbon and organic carbon and their direct effect on climate over South Asia. The model is driven by the NCAR/NCEP re-analysis data. Multi-year simulations with half, normal and double emission fluxes are conducted. Results show that the model performs well in reproducing present climate over the region. Simulations of the aerosol optical depth and surface concentration of aerosols are also reasonable although to a less extent. The negative radiative forcing is found at the top of atmosphere and largely depended on emission concentration. Surface air temperature decreases by 0.1-0.5℃ both in pre-monsoon and monsoon seasons. The range and intensity of cooling areas enlarge while aerosol emission increases. Changes in precipitation are between -25 and 25%. Different diversifications of rainfall are showed with three emission scenarios. The changes of precipitation are consistent with varieties of monsoon onset dates in pre-monsoon season. In the regions of increasing precipitation, monsoon onset is advanced and vice versa. In northeast India and Myanmar, aerosols lead the India summer monsoon onset advancing 1-2 pentads, and delaying by 1-2 pentads in central and southeast India. These changes are mainly caused by the anomaly of local Hadley circulations and enhancive precipitation. Tibetan Plateau played a crucial role in the circulation changes.
机译：结合化学-气溶胶模型的区域气候模型被用于模拟人为气溶胶，包括硫酸盐，黑碳和有机碳及其对南亚气候的直接影响。该模型由NCAR / NCEP重新分析数据驱动。进行了具有一半，正常和两倍排放通量的多年模拟。结果表明，该模型在再现该地区目前的气候方面表现良好。气溶胶光学深度和气溶胶表面浓度的模拟也是合理的，尽管程度较小。负辐射强迫存在于大气层的顶部，在很大程度上取决于排放浓度。在季风前和季风季节，地面空气温度降低0.1-0.5℃。冷却区域的范围和强度增大，而烟雾排放增加。降水变化在-25％到25％之间。三种排放情景显示了降雨的不同多样性。降水的变化与季风前季节季风发作日期的变化一致。在降水增加的地区，季风发作提前，反之亦然。在印度东北部和缅甸，气溶胶导致印度夏季风发作提前1-2候，在印度中部和东南部推迟1-2候。这些变化主要是由当地哈德利环流异常和降水增加引起的。青藏高原在环流变化中起着至关重要的作用。

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  • 来源
    《Climate dynamics》 |2011年第10期|p.1633-1647|共15页
  • 作者

    Zhenming Ji; Shichang Kang; Dongfeng Zhang; Chunzi Zhu; Jia Wu; Ying Xu;

  • 作者单位

    Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085 Beijing, China,National Climate Center, 100081 Beijing, China,Graduate University of Chinese Academy of Sciences, 100049 Beijing, China;

    rnKey Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, 100085 Beijing, China,State Key Laboratory of Cryospheric Science, Chinese Academy of Sciences, 730000 Lanzhou, China;

    rnShanxi Meteorological Bureau, 030002 Taiyuan, China;

    rnCollege of Atmospheric Science, Nanjing University of Information Science Technology, 210044 Nanjing, China;

    rnNational Climate Center, 100081 Beijing, China;

    rnNational Climate Center, 100081 Beijing, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    indian summer monsoon; regional climate; model; aerosols; climate effect;

    机译：印度夏季风;区域气候;模型;气雾剂气候影响;

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