Effects of Black Carbon Aerosol in South Asia on Asian Summer Monsoon
Effects of Black Carbon Aerosol in South Asia on Asian Summer Monsoon
复制标题
南亚黑碳气溶胶对亚洲夏季风的影响
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Wang Zhi
中科院分区：
文献类型：
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作者：
Wang Zhi
利用国家大气研究中心(NCAR)开发的共同体大气模式第3版(CAM3)，研究了南亚黑碳气溶胶(BC)对亚洲夏季风的影响。结果表明，在晚春，由于BC对南亚地区太阳辐射的强吸收，使得对流层下部受到加热，从而可能导致孟加拉湾及其沿岸雨期提前和印度夏季风爆发。夏季，加热的空气沿青藏高原南坡上升，在高空形成一个稳定的加热层，从而导致孟加拉湾及其沿岸雨季提前和印度夏季风爆发。南亚大陆与印度洋之间出现北升南降的经向环流，加强了北上运动，加强了印度夏季风；而南亚的BC减弱了东亚夏季风，导致西太平洋副热带高压向西北延伸，并通过影响地面气压、垂直运动、降水、850百帕风场等，使中国梅雨带向东北偏移。
The effects of black carbon aerosol(BC) in the South Asia on Asian summer monsoon have been investigated by using the Community Atmosphere Model Version 3(CAM3) developed by the National Center for Atmospheric Research(NCAR).The results show that BC heats the lower troposphere because of strongly absorbing the solar radiation in the South Asia during the late spring.This may lead to an advance of the rainy periods of the Bay of Bengal and its coast and the outbreak of the Indian summer monsoon.In summer,the heated air forms a steady heating layer at upper air through ascending along the southern slope of the Tibetan Plateau,which gives birth to a local motion of deep convection.Thus,a meridional circulation that ascends in the north and subsides in the south appears between the South Asia continent and the Indian Ocean,which enhance the northward motion and intensifies the Indian summer monsoon.However,the BC of the South Asia weakens the East Asian summer monsoon,induces western Pacific Subtropical High to extend northwestward,and causes the Meiyu belt of China to shift northeastward through impacting on the surface pressure,vertical motion,precipitation,wind field of 850 hPa and so on.