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- Title
Northeast China Cold Vortex Observed by FY‐3 MWTS‐2 and MetOp AMSU‐A.
- Authors
Niu, Zeyi; Zou, Xiaolei; Li, Deqin
- Abstract
The northeast China cold vortex (NCCV) refers to a closed low‐pressure system over northeast China extending from China‐Siberia to the northwest Pacific coast region. It is cut off from the westerly jet belt in the middle and upper troposphere, has a cold core, lasts several days, and could bring heavy rain events in late spring and summer that are of great challenge to weather forecasters. This study investigates the possibility of observing temperature structures of NCCVs by two microwave temperature sounders, that is, the Microwave Temperature Sounder‐2 (MWTS‐2) and the Advanced Microwave Sounding Unit‐A (AMSU‐A) onboard the two polar‐orbiting operational environmental satellites (POES) Fenyun‐3 satellite FY‐3D and Meteorological Operational satellite MetOp‐B, respectively. The MWTS‐2 and AMSU‐A together provide 3D atmospheric temperatures in the middle and upper troposphere, as well as the lower stratosphere four times daily. Both limb‐corrected direct observations of brightness temperature and retrievals of atmospheric temperature within NCCVs are characterized by cold and warm cores below and above the tropopause, respectively, comparing favorably with the European Centre for Medium‐Range Weather Forecasts ERA5 reanalysis. Compared with the ERA5 reanalysis in June 2019, the MWTS‐2 retrieved atmospheric temperatures have no scan‐dependent biases, the biases are smaller than ±0.2K, and root‐mean‐square errors (RMSEs) are smaller than and 2.0K at all altitudes. This study suggests the possibility of using multiple POES microwave‐temperature‐sounding observations for near‐real‐time monitoring of NCCVs' 3D temperature structures. Plain Language Summary: Near‐real‐time monitoring of the northeast China cold vortex (NCCV)'s 3D temperature structures by the polar‐orbiting satellite microwave observations. Both limb‐corrected direct observations of brightness temperature and temperature retrievals within NCCVs are characterized by cold and warm cores below and above the tropopause, respectively, comparing favorably with ERA5 reanalysis. Key Points: This study investigates the possibility of observing temperature structures of NCCVs by two microwave temperature sounders MWTS‐2 and AMSU‐A
- Subjects
PERSONAL propulsion units; WEATHER forecasting; TROPOPAUSE; METEOROLOGICAL precipitation; HYDROLOGIC cycle
- Publication
Journal of Geophysical Research. Atmospheres, 2021, Vol 126, Issue 23, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2021JD035471