科研进展
科研进展
您的当前位置:首页 > 科研成果 > 科研进展

Atmospheric boundary layer sources for upper tropospheric air over the Asian summer monsoon region

发布人:ljh  |  来自:本站  |  发布时间:2017-11-09 17:40:31  |  点击次数:71
全文下载链接:http://lageo.iap.ac.cn/uploads/171110014224ku1tp3863gvp.pdf

Previous satellite measurements and model simulations have shown that the Asian summer monsoon (ASM) anticyclone is co-located with higher concentrations of pollutants, which are emitted in the continental atmospheric boundary layer (ABL). Backward trajectory calculations show that the air at the 150-hPa level has the maximum frequency of ABL sources within 30 days over the most intensive convection regions and their downwind areas, which are not located within the ASM anticyclone, but rather at the southern flank or periphery of the ASM anticyclone. The upper tropospheric airs originated from the ABL sources include two parts: one from the ocean, which has the dominant impact to the south of 20°N, particularly over the South China Sea (SCS) and the west tropical Pacific Ocean; and another from the continent, which is dominant between 10°N and 30°N, particularly over the Bay of Bengal (BoB), continental India, the Arabian Sea, and the Arabian Peninsula. It is the latter part that forms the higher pollutant concentration within the ASM anticyclone as shown by satellite measurements. Air in the ABL sources (both polluted and unpolluted) converges to the intensive convection region in the lower troposphere, and then traverses the middle troposphere through a wide group of upward pipes, and finally to the upper troposphere. These pipes in the middle troposphere are defined by the ASM intensive convections and cover the south of continental India, the BoB, the Tibetan Plateau, the Indochina Peninsula, the SCS, and the Philippine Sea.

摘要

利用TRAJ3D模拟亚洲夏季风区空气的边界层来源。30天后向轨迹的统计结果显示,150hPa上,源于边界层的空气主要集中在亚洲夏季风反气旋南侧的深对流区及其下风向,而不是反气旋中心;将边界层源分为海洋(20°N以南的中国南海和西太平洋)和陆地(10–30°N之间的孟加拉湾、印度、环阿拉伯海地区)分别进行考察,携带高浓度污染物的陆地边界层空气在150hPa上的集中位置与卫星观测到的CO高值中心相对应,洁净的海洋边界层空气对反气旋东南侧的高浓度污染物起到稀释作用。

  • 卫星数据中心
  • |
  • 大气物理所
  • |
  • 北京朝阳区华严里40号, 100029 电话:010-82995065,82995091 传真:010-82995073
    版权所有:中国科学院大气物理研究所中层大气和全球环境探测重点实验室
    京ICP备1234556号