云垂直重叠特性与风切变强度的参数化关系构建  

Construction of parametric relationship between cloud vertical overlap characteristics and wind shear intensity

作　　者：刘玉洁 彭杰 张峰 吴琨[1,5] 刘鹏[1] 陈国兴 LIU YuJie;PENG Jie;ZHANG Feng;WU Kun;LIU Peng;CHEN GuoXing(Key Laboratory of Meteorological Disaster,Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences,Fudan University,Shanghai 200438,China;Shanghai Ecological Forecasting and Remote Sensing Center,Shanghai 200030,China;Shanghai Qi Zhi Institute,Shanghai 200232,China;Institute for Climate and Application Research,Nanjing University of Information Science and Technology,Nanjing 210044,China;Luoyang Meteorological Bureau,Luoyang 471000,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心,南京210044 [2]复旦大学大气与海洋科学系/大气科学研究院,上海200438 [3]上海市生态气象和卫星遥感中心,上海200030 [4]上海期智研究院,上海200232 [5]南京信息工程大学气候与应用前沿研究院,南京210044 [6]洛阳市气象局,洛阳471000

出　　处：《地球物理学进展》2023年第3期1000-1012,共13页Progress in Geophysics

基　　金：国家重点研发计划(2020YFA0608003);国家自然科学基金(42075125,41905007)联合资助。

摘　　要：基于CloudSat/CALIPSO卫星在2007—2010年的观测数据,研究了气候模式中用于表达云层垂直方向上重叠关系的关键参数——抗相关厚度(L),并构建了L与风切变强度的参数化关系.结果表明:全球范围内,L与风切变总体呈现较为明显的负相关,该关系在北半球中纬度地区更为显著,两者的相关系数可达-0.94.但在以洋面为主的南半球中高纬度地区,L与风切变强度的负相关关系明显减弱.用于计算L的云层空间采样尺度与云样本对应的L呈现出近似线性的正相关,这表明随着云层空间采样尺度的变大,不同高度的云层在垂直方向上重叠的部分趋于更多.此外,在不同的空间采样尺度条件下,L与风切变强度参数化关系式中的系数也存在差异.因此,云层的空间采样尺度也是气候模式中建立精细化的L参数化方案时需要考虑的重要因子之一.Based on the observation of CloudSat/CALIPSO satellite from 2007 to 2010,the key parameter used to express the overlapping relationship in the vertical direction of cloud layer in climate model:the decorrelation length(L)is studied,and the parametric relationship between L and wind shear intensity is constructed.The results show that:L has an obvious negative correlation with wind shear on a global scale,which is more significant in the northern hemisphere's middle latitudes,and the correlation coefficient reaches-0.94.However,the negative correlation between L and wind shear intensity is significantly weaker at mid and high latitudes in the southern hemisphere,where the ocean surface is dominant.The spatial sampling scale of clouds used to calculate L shows an approximately linear positive correlation with the corresponding L of cloud samples.It indicates that clouds of different heights tend to overlap more in the vertical direction as the spatial sampling scale of clouds becomes larger.In addition,the coefficients in the parametric relationship between L and wind shear intensity also differ under different spatial sampling scales.Therefore,the spatial sampling scale of clouds is also an important factor to consider when establishing a refined L parameterization scheme in climate models.

关 键 词：云垂直重叠 抗相关厚度 风切变 空间采样尺度 

分 类 号：P401[天文地球—大气物理学与大气环境]