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Advances in Atmospheric Sciences

, Volume 34, Issue 4, pp 559–570 | Cite as

Analysis of a vortex precipitation event over Southwest China using AIRS and in situ measurements

  • Chengcheng Ni
  • Guoping Li
  • Xiaozhen Xiong
Original Paper

Abstract

A strong precipitation event caused by the southwest vortex (SWV), which affected Sichuan Province and Chongqing municipality in Southwest China on 10–14 July 2012, is investigated. The SWV is examined using satellite observations from AIRS (Atmospheric Infrared Sounder), in situ measurements from the SWV intensive observation campaign, and MICAPS (Marine Interactive Computer-Aided Provisioning System) data. Analysis of this precipitation process revealed that: (1) heavy rain occurred during the development phase, and cloud water content increased significantly after the dissipation of the SWV; (2) the area with low outgoing longwave radiation values from AIRS correlated well with the SWV; (3) variation of the temperature of brightness blackbody (TBB) from AIRS reflected the evolution of the SWV, and the values of TBB reduced significantly during the SWV’s development; and (4) strong temperature and water vapor inversions were noted during the development of the SWV. The moisture profile displayed large vertical variation during the SWV’s puissant phase, with the moisture inversion occurring at low levels. The moisture content during the receding phase was significantly reduced compared with that during the developing and puissant phases. The vertical flux of vapor divergence explained the variation of the moisture profile. These results also indicate the potential for using AIRS products in studying severe weather over the Tibetan Plateau and its surroundings, where in situ measurements are sparse.

Key words

precipitation event AIRS southwest vortex temperature profile moisture profile 

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Notes

Acknowledgements

The authors would like to express their sincere thanks to the Plateau Meteorological Data Centre associated with the Chengdu Institute of Plateau Meteorology, CMA, which supplied the intensive sounding data for the SWV observation experiment. This work was supported by the Special Fund for Meteorological Research in the Public Interest (Grant No. GYHY201206042), and the National Natural Science Foundation of China (Grant No. 41675057, 91337215).

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.School of Atmospheric SciencesChengdu University of Information TechnologyChengduChina
  2. 2.Meteorological ObservatoryChengdu Meteorological BureauChengduChina
  3. 3.Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjingChina
  4. 4.Centre of Satellite Application and ResearchNOAACollege ParkUSA

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