气象科学2024，Vol.44Issue(6)：1122-1133,12.DOI:10.12306/2024jms.0045
利用卫星微波观测亮温监测东北冷涡移动路径
A comparative study on the movement paths of Northeast China cold vortex between satellite microwave observations and all-sky simulations
摘要
Abstract
Reanalysis data had extensively employed for investigating of Northeast China Cold Vortices(NCCVs),which frequently occur in late spring and early summer and cause cold temperature and thunderstorms.In this study,the MetOp-B Advanced Microwave Sounding Unit-A(AMSU-A)brightness temperature observations in the upper troposphere were used to track the movement paths of NCCV.Four NCCV cases that occurred in May,June and July 2020 were selected.The brightness temperature observations at AMSU-A channels 7 and 8,whose peak weighting function are located near 250 and 200 hPa vertical levels,respectively,have clear warm core structures,whose temporal evolutions followed a continuing southward and downward intrusion of stratospheric air of NCCVs.The movement paths of NCCV can thus be determined by the center positions of warm cores of brightness temperature observations at AMSU-A channels 7 and 8.The moving paths of the four NCCVs compared favorably with the ERA5 all-sky simulations and operational analysis,which had drawn high-vertical-resolution radiosondes and satellite observations including AMSU-A.Originating in central Siberia,the movement paths of four NCCVs headed southeastward,reaching different latitudes before heading eastward,southeastward or northeastward.MetOp-B is a morning orbit satellite which provides global observations twice daily.Together with microwave temperature-sounding instruments onboard an early-morning(FY-3E)and an afternoon orbit(FY-3D or NOAA-20)satellites,an NCCV moving path can be monitored six times daily with a three-orbit constellation in real time.关键词
星载微波温度计/全天空模拟亮温/东北冷涡/移动路径/临边订正Key words
microwave temperature sounder onboard satellite/all-sky simulation of brightness temperature/NCCVs/moving path/limb correction分类
天文与地球科学引用本文复制引用
毛严,邹晓蕾,董慧杰..利用卫星微波观测亮温监测东北冷涡移动路径[J].气象科学,2024,44(6):1122-1133,12.基金项目
国家重点研发计划资助项目(2018YFC1506702) （2018YFC1506702）
