Comparison of tropical cyclone thermal structures derived from ATMS and synthetic AMSU-A/MHS  

作　　者：Wenyu Li Fuzhong Weng 

机构地区：[1]Chinese Academy of Meteorological Sciences,Beijing,China [2]Center for Earth System Modeling and Prediction of CMA,Beijing,China

出　　处：《Atmospheric and Oceanic Science Letters》2024年第4期29-34,共6页大气和海洋科学快报（英文版）

基　　金：This study was supported by the Hunan Provincial Natural Science Foundation of China[grant number 2021JC0009];the Natural Science Foundation of China[grant number U2142212];the National Key R&D Program of China[grant number 2022YFC3004200].

摘　　要：热带气旋(TC)的暖心反映了其强度和变化.微波探测数据被广泛用于探测TC暖心,但观测到的TC暖心强度可能因仪器而异.本研究利用先进技术微波探测仪(ATMS)的过采样数据重采样至与先进微波探测仪(AMSU-A)一致的亮温,称为类AMSU数据.通过对比发现,ATMS的观测更加细致,较好地刻画了TC眼区和云带.使用ATMS和类-AMSU数据反演多个TC的暖心发现,在250 hPa,使用ATMS数据反演的暖心强度比类-AMSU高约1-2K,并且其暖心结构更详细.The warm core of a tropical cyclone(TC)reflects its intensity and evolution.In the past,microwave sounding data have been widely used for detecting the TC warm core.However,the observed magnitude of the TC warm core can vary with instruments.This study utilizes the oversampling data from the Advanced Technology Microwave Sounder(ATMS)to reconstruct the brightness temperature data consistent with the data from Advanced Microwave Sounding Unit-A(AMSU-A),which is referred to as AMSU-like data.Through comparisons,it is found that brightness temperature from the original ATMS has more detailed structures,depicting well the TC eye region and cloud bands.Both ATMS and AMSU-like data are used as inputs to the Global Scene-Dependent Atmospheric Retrieval Testbed(GSDART)to retrieve the warm cores of multiple TCs.At 250 hPa,the warm-core intensity retrieved using ATMS data is about 1-2 K higher than that from AMSU-like data and the warm-core structure from ATMS is more detailed.It is recommended that the warm-core intensity retrieved from AMSU-A be corrected to the ATMS values for multi-sensor monitoring of TCs using our newly defined relationship.

关 键 词：热带气旋 暖心 ATMS AMSU-A 微波探测数据 

分 类 号：P407.7[天文地球—大气科学及气象学] P444