巴丹吉林和腾格里沙漠降水特征初步分析

摘要

As the most important deserts in Northern China,the precipitation in the Badain Jaran and Tengger deserts played a signifi-cant role on their formation and evolution.In this paper,based on the hourly merged precipitation during 2008 -2013,the NCEP/NCAR reanalysis data and observations from weather stations on 19 August 2010,the spatial and temporal distributions of precipitation in the Badain Jaran and Tengger deserts were studied,firstly.And on this basis,the precipitaion of a typical precipitation process oc-curring on 19 August 2010 there was contrastively analyzed.The results are as follows:(1)The precipitation in the Badain Jaran and Tengger deserts concentrated on May to September,while it was less in other months.(2)The merged data of precipitation could me-ticulously describe the hourly change characteristics of precipitation in four seasons in the two deserts.(3)By analyzing the circulation pattern and relevant physical quantities of a rainfall case,it was found that the observed precipitation from sites around the desert couldn't entirely reflect the precipitation in the whole desert,however the merged precipitation product was closely related with the at-mospheric circulation situation and element fields from NCEP data,and it can embody the panorama of precipitation in the Badain Jaran and Tengger deserts.%巴丹吉林沙漠和腾格里沙漠作为中国北方最重要的两大沙漠,降水对其形成和演变意义重大.本文利用2008~2013年中国降水融合资料以及2010年8月19日NCEP再分析资料、地面台站观测资料,对比研究了巴丹吉林和腾格里两大沙漠区的降水时空分布特征和一次典型降水个例.结果表明:(1)巴丹吉林沙漠和腾格里沙漠地区的降水主要集中在5~9月,其它月份降水量均较少;(2)降水融合资料能够细致地刻画出两大沙漠不同季节日均逐时降水量的变化特征;(3)通过个例分析发现,沙漠周边站点资料无法全面反映整个沙漠的降水情况,而降水融合资料显示的降水过程与NCEP资料的高空形势以及要素场分布有很好的对应关系,能够较为细致地反映沙漠降水的全貌.