探空气球漂移位置订正对一次大风降温过程的模拟研究  

Positioning of Sounding Balloon Drifting Associated with a Gale Process and Temperature Drop

作　　者：嵇磊[1,2,3,4] 黄梦宇[2] 李书严[5] 周珺[1] 

机构地区：[1]中国科学院大气物理研究所,北京100029 [2]北京市人工影响天气办公室,北京100089 [3]北京市气象局云降水物理研究与云水资源开发北京市重点实验室,北京100089 [4]中国科学院大学,北京100049 [5]北京市气候中心,北京100089

出　　处：《气候与环境研究》2012年第6期848-854,共7页Climatic and Environmental Research

基　　金：公益性行业(气象)科研专项GYHY200906025;国家自然科学基金40975064;中国科学院知识创新工程重要方向项目KZCX2-EW-203;北京市优秀人才培养资助项目2012D002034000001

摘　　要：应用改进后的MM5模式,采用包含有实际探空气球在各个气压层上精确的经纬度信息的新型探空资料,研究探空资料对高分辨率中尺度数值模式的影响。通过对一次中尺度大风降温天气过程的模拟分析,可以看出:位置订正对初始气象要素场的改变虽然总体上有低层较小,高层较大的特征,但是在500hPa以下大气运动剧烈的情况下,低层气象要素场的改变量也会较大,甚至会超过高层相应的气象要素场的变化,速度场的改变尤为明显;位置订正使得模拟结果在数值和影响范围上都有效地减小了误差,更加接近实况;位置订正后,模式较准确的模拟出了该次向南推进的大风降温过程的移动变化,尤其是模拟的大风前沿位置与实况的对应关系较好,温度场的变化与速度场的变化有较好的一致性。With the improved model MM5, the impact of a height-dependent sounding balloon＇s drifting on a mesoscale numerical model is analyzed, using new sounding data with accurate position information at each pressure level. Simula- tions of a gale and a temperature decrease indicate the following： the differences in the initial meteorological element fields, especially the velocity field, caused by position correction would be great in the lower layers, even exceeding that in the upper layers, when the atmospheric motion becomes strong below 500 hPa, although the differences are greater in the upper layers than in the lower layers in the mass. Position correction can reduce the simulation errors not only in thenumerical values but also in the sphere of influence, so the results approach the observed data more closely. After position correction, the model can accurately simulate the southward movement of the strong wind and temperature decrease. The simulated foreland of the strong wind corresponds with the observed data, and the variation in the temperature field is quite consistent with the variation in the velocity field.

关 键 词：位置订正 探空气球 MM5 大风 降温 

分 类 号：P435[天文地球—大气科学及气象学]