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| Anomaly of the Moist Potential Vorticity Substance with Mass Forcing and Its Application in Diagnosing Mei-Yu Front Rainfall |
| ZHOU Yu-Shu1,ZHU Ke-Feng2,ZHANG Zhe1,3 |
1Laboratory for Cloud-Precipitation Physics and Severe Storms (LACS), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2School of Atmospheric Sciences, Nanjing University, Nanjing 210093, China
3University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The effects of precipitation on the moist potential vorticity substance (MPVS) are investigated by analyzing the MPVS with precipitation mass forcing and its impermeability in daily 1° × 1° data of the National Centers for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) over the Yangtze River Basin from 21 June to 2 July 1999. The results show that the positive MPVS anomalies appear mainly along the Mei-yu front, where the maximum MPVS collocates with the maximum surface rainfall. Rain case diagnoses indicate that the MPVS anomaly may be used as a dynamical signal to detect the location and shift of the rain band when its impermeability is considered.
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Received: 08 July 2014
Revised: 12 September 2014
Accepted: 10 October 2014
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Corresponding Author:
ZHOU Yu-Shu
E-mail: zys@mail.iap.ac.cn
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