太平洋上云水路径反演产品及其气候变化特征分析  

Cloud Liquid Water Path Retrieval Products over the Pacific Ocean and Their Climate Change Characteristics

作　　者：钱小立 秦正坤[1,2] 张文君[1] QIAN Xiaoli;QIN Zhengkun;ZHANG Wenjun(School of Atmospheric Science,Nanjing University of Information Science&Technology,Nanjing 210044;Joint Center of data assimilation research and applications,school of atmospheric science,Nanjing University of Information Science&Technology,Nanjing 210044)

机构地区：[1]南京信息工程大学大气科学学院,南京210044 [2]南京信息工程大学大气科学学院资料同化研究与应用联合中心,南京210044

出　　处：《大气科学》2022年第6期1381-1393,共13页Chinese Journal of Atmospheric Sciences

基　　金：国家重点研发计划项目2016YFC0402702;国家自然科学基金青年项目41805076;中国气象科学研究院基本科研业务费专项资金项目2019Z006。

摘　　要：基于极轨卫星NOAA-15上的微波温度计AMSU-A(Advanced Microwave Sounding Unit-A)多年亮温观测资料,建立了全球海洋上的云液态水路径反演产品,并通过对比ERA5和FNL/NCEP再分析资料的云水路径产品,分析了反演产品对云液态水路径气候变化特征的再现能力,进一步通过线性回归和EEMD(Ensemble Empirical Mode Decomposition)方法分别分析了太平洋地区大气云水路径的线性和非线性气候变化趋势特征。结果表明,云水路径反演资料可以很好的再现多年平均空间分布特征及相应的气候变化趋势,云水路径气候趋势表现出明显的纬度带特征,增多和减小趋势随纬度带间隔出现,而且在北半球东太平洋地区,云水路径气候趋势的纬度带特征有向北迁移的现象。相比而言,反演产品的气候趋势与ERA5再分析资料有更好的相似性,而FNL资料对趋势的纬度带特征,尤其是纬度带特征的北移现象未能很好的再现,只是表现为赤道地区水汽减少,而两侧云水路径显著增加的特征。Based on the multi-year brightness temperature observation data of the AMSU-A(Advanced Microwave Sounding Unit-A)on the polar-orbiting satellite NOAA-15,a product of cloud liquid water path on the global ocean has been established and compared with ERA5 and FNL/NCEP.We analyzed the ability of retrieval products to reproduce the climate change characteristics of cloud liquid water path,and further analyzed the linear and nonlinear climate change trend characteristics of cloud water path in the Pacific region through linear regression and EEMD(Ensemble Empirical Mode Decomposition)methods.The results show that the CLWP(Cloud Liquid Water Path)inversion data can well reproduce the average spatial distribution characteristics of the years and the corresponding climate change trend.The CLWP climate trend shows obvious latitude zone characteristics,and the increasing and decreasing trends appear with the latitude zone interval.Moreover,in the eastern Pacific region of the northern hemisphere,the latitude zone characteristic of the climatic trend of the CLWP has a phenomenon of migration northward.In contrast,the climatic trend of the inversion product has better similarity with the ERA5 reanalysis data.While the latitude zone characteristics of the trend,especially the northward movement of the latitude zone characteristics,cannot be reproduced well by the FNL data.It is characterized by a decrease in water vapor in the equatorial region,and a significant increase in cloud liquid water paths on both sides.

关 键 词：微波温度计 云液态水路径 EEMD方法 气候变化趋势 

分 类 号：P467[天文地球—大气科学及气象学]