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Impacts of Cloud-Induced Mass Forcing on the Development of Moist Potential Vorticity Anomaly During Torrential Rains


doi: 10.1007/BF02915594

  • The impacts of cloud-induced mass forcing on the development of the moist potential vorticity (MPV)anomaly associated with torrential rains are investigated by using NCEP/NCAR 1°× 1° data. The MPV tendency equation with the cloud-induced mass forcing is derived, and applied to the torrential rain event over the Changjiang River-Huaihe River Valleys during 26-30 June 1999. The result shows that positive anomalies are located mainly between 850 hPa and 500 hPa, while the maximum MPV, maximum positive tendency of the MPV, and maximum surface rainfall are nearly collocated. The cloud-induced mass forcing contributes to the positive tendency of the moist potential vorticity anomaly. The results indicate that the MPV may be used to track the propagation of rain systems for operational applications.
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Manuscript History

Manuscript received: 10 November 2004
Manuscript revised: 10 November 2004
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Impacts of Cloud-Induced Mass Forcing on the Development of Moist Potential Vorticity Anomaly During Torrential Rains

  • 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,100029,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing,100029,Beijing University of Technology, Beijing,100022

Abstract: The impacts of cloud-induced mass forcing on the development of the moist potential vorticity (MPV)anomaly associated with torrential rains are investigated by using NCEP/NCAR 1°× 1° data. The MPV tendency equation with the cloud-induced mass forcing is derived, and applied to the torrential rain event over the Changjiang River-Huaihe River Valleys during 26-30 June 1999. The result shows that positive anomalies are located mainly between 850 hPa and 500 hPa, while the maximum MPV, maximum positive tendency of the MPV, and maximum surface rainfall are nearly collocated. The cloud-induced mass forcing contributes to the positive tendency of the moist potential vorticity anomaly. The results indicate that the MPV may be used to track the propagation of rain systems for operational applications.

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