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高原气象  2009 

南亚地区黑碳气溶胶对亚洲夏季风的影响

, PP. 419-424

Keywords: 南亚,黑碳气溶胶,亚洲夏季风

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Abstract:

利用NCAR的全球大气模式CAM3,模拟了南亚地区黑碳气溶胶对亚洲夏季风的影响。结果表明:晚春时期,南亚地区黑碳气溶胶强烈吸收太阳辐射,加热低层大气,造成孟加拉湾及沿岸地区雨季的提前,可能导致南亚夏季风提前爆发。夏季,被加热的大气沿青藏高原南坡爬升,在高空形成一个稳定的加热层。高空的持续加热,引起局地的深对流活动,使得印度洋和南亚大陆之间产生一个北升南降的经圈环流,导致印度洋洋面上的向北运动加强,从而使南亚夏季风的强度增大。但是,南亚地区黑碳气溶胶通过影响表面气压、垂直运动、降水和850hPa风场等减弱了东亚夏季风,且导致西太平洋副热带高压北移西伸,使我国梅雨带位置向东北方向移动。

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