人为气溶胶对中国东部冬季风影响的模拟研究
投稿时间: 2016-05-25  最后修改时间: 2016-06-07  点此下载全文
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王东东 南京信息工程大学大气物理学院 33478522@qq.com 
朱彬 南京信息工程大学大气物理学院 binzhu@nuist.edu.cn 
江志红 南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室江苏 南京 210044  
廖宏 南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室江苏 南京 210044  
陈海山 南京信息工程大学气象灾害教育部重点实验室气候与环境变化国际合作联合实验室气象灾害预报预警与评估协同创新中心中国气象局气溶胶与云降水重点开放实验室江苏 南京 210044  
基金项目:国家自然科学基金项目(91544229;41575148);国家重点基础研究发展计划(2010CB428505)
中文摘要:本文利用美国国家大气研究中心(NCAR)的公共大气模式CAM5.1研究了人为气溶胶排放增加对中国东部冬季风的影响。通过改变东亚区域人为气溶胶排放源的不同敏感性试验,研究了人为硫酸盐、黑碳气溶胶的增加及共同增加对东亚冬季风的影响。冬季硫酸盐气溶胶的直接和第一间接效应减少了到达地表的短波辐射通量,引起了陆地地表和对流层低层降温,海平面气压升高,增加了海陆间气压梯度,增强东亚冬季风;第二间接效应导致中国南部大尺度降水率减少。黑碳气溶胶导致到达地表的短波辐射通量减少和大气中短波辐射通量增加,半直接效应部分抵消了直接效应,地表温度变化微小且不显著;加热的低层对流层导致了中国南部对流活动和对流降水率的增加。总人为气溶胶(硫酸盐和黑碳共同)导致的大气温度变化为弱的降温作用,是两种人为气溶胶的共同结果;中国北部对流和大尺度降水率减少,而南部对流降水率增加。总人为气溶胶和黑碳气溶胶导致中国北部的东亚冬季风增强,而中国南部减弱。
中文关键词:冬季气候  人为硫酸盐气溶胶  人为黑碳气溶胶  东亚冬季风
 
A numerical study of the effects of anthropogenic aerosol on the East Asian winter monsoon over eastern China
Abstract:In this study, the impact of the increases in anthropogenic aerosol on the East Asian winter monsoon (EAWM) over eastern China are investigated using the NCAR Community Atmospheric Model version 5.1 (CAM5.1). The effects of the increases in anthropogenic sulfate, black carbon (BC) and both of them on the EAWM are decomposed from different sensitivity simulations by changing the anthropogenic aerosol emission sources in East Asian region. The direct and 1st indirect effects of sulfate reduce the solar flux reaching the surface in winter, leading to a reduction of the air temperature of surface and low troposphere and an increase of the sea level pressure over land. The gradient of pressure between land and sea is increased and the EAWM is enhanced. The large-scale precipitation in South China is reduced by the 2nd indirect effects of sulfate. The effects of BC reduce the solar flux reaching the surface and increase the solar flux in the atmosphere by absorbing. The BC have an insignificant reduction of the surface air temperature, because of the semi-direct effects of BC partly offset the direct. The heating of the low troposphere leads to an enhanced convection and an increased convective precipitation in South China. The effects of total anthropogenic aerosol (both sulfate and BC aerosol) result to a weaker reduction of air temperature, which are the common result of two kinds of aerosols. The convective and large-scale precipitation are both reduced in North China, and the convective precipitation is increased in South China. The effects of total aerosol and BC result to an enhanced EAWM in North China, and weakened in South China.
keywords:Winter climate  anthropogenic sulfate aerosol  anthropogenic black carbon aerosol  East Asian Winter Monsoon
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