华北地区沙尘气溶胶对云辐射强迫的影响

采用CERES SSF Aqua MODIS Edition 2B/2C和CALIPSO卫星探测资料结合地面台站沙尘观测资料,通过对强沙尘天气过程中纯云区与沙尘云区大气层顶处辐射强迫值的对比分析,研究了我国华北地区沙尘气溶胶对云辐射强迫的影响.研究发现, 2006年4月16日、5月16日、2007年3月30日3次过程沙尘云区大气层顶云的净辐射强迫绝对值比纯云区分别减小了7.1%,17.2%和3.1%,云的冷却效应受到不同程度抑制.纯云区与沙尘云区云的光学特性参量的对比分析结果表明,绝大部分沙尘云区的云粒径、云水路径和光学厚度值均比纯云区的要小.

Influence of dust aerosols on cloud radiative forcing over Northern China

Influence of dust aerosols on top-of-atmosphere (TOA) radiative forcing (RF) of clouds over Northern China was analyzed by comparing that of pristine cloudy regions with that of dust contaminated cloudy regions using data from CERES SSF Aqua MODIS Edition 2B/2C, CALIPSO satellite and dust observations from meteorological stations. The results show that for the three episodes of April 16, 2006, May 16, 2006 and March 30, 2007, the TOA net RF over dusty clouds was 7.1%, 17.2% and 3.1% less than that over pure clouds. The cooling effect of clouds was weakened to varying degrees. The comparison of cloud optical properties between pristine cloudy regions and dust contaminated cloudy regions showed that in most cases the particle radius/diameter, water path and optical depth of dusty clouds were less than the same parameters of pure clouds.