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OALib Journal期刊
ISSN: 2333-9721
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气溶胶直接效应对中国夏季降水影响的数值模拟研究
DOI: 10.13232/j.cnki.jnju.2015.03.015
Keywords: 中国,气溶胶,直接效应,降水
Abstract:
在东亚地区，气溶胶是一个重要的气候强迫因子，它与季风之间的相互作用具有很强的不确定性，利用数值模式进一步研究气溶胶与季风降水之间的关系十分必要。本文采用ictp(internationalcentrefortheoreticalphysics)第四代区域气候模式(regcm4)，通过两组对比试验和多年长期积分来研究气溶胶直接效应对中国夏季降水的影响。采用trmm卫星降水资料和modis卫星气溶胶光学厚度资料评估了区域气候模式对中国夏季气溶胶和降水的模拟能力。总体来看，regcm4能够再现我国夏季气候的主要特征，对我国夏季风环流和降水具有一定的模拟能力。气溶胶直接效应使得对流层温度降低，减弱了经向风环流，加强了位于20°n-30°n范围的上升气流和35°n以北地区的下沉气流，在我国东部引起了气旋式环流异常，并在110°e附近产生了速度接近1m/s的北风增强。总降水量的变化呈现出“南多北少”的趋势。在季风区，对流性降水和非对流性降水分别减少了0.05mm/day和0.07mm/day，其中非对流性降水的相对变化较大。从各类型降水的日变化可以看出，降水的减少主要发生在夜间至凌晨时段。
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