Application of Generalized Moist Potential Vorticity in Non-uniformly Saturated Atmosphere to Torrential Rain Forecast

Zhou Yushu; Cao Jie; Wang Donghai

Vol.18, NO.6, 2007

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2007 > 18(6): 754-759

Zhou Yushu, Cao Jie, Wang Donghai. Application of generalized moist potential vorticity in non-uniformly saturated atmosphere to torrential rain forecast. J Appl Meteor Sci, 2007, 18(6): 754-759.

Citation:

Zhou Yushu, Cao Jie, Wang Donghai. Application of generalized moist potential vorticity in non-uniformly saturated atmosphere to torrential rain forecast. J Appl Meteor Sci, 2007, 18(6): 754-759.

Zhou Yushu, Cao Jie, Wang Donghai. Application of generalized moist potential vorticity in non-uniformly saturated atmosphere to torrential rain forecast. J Appl Meteor Sci, 2007, 18(6): 754-759.

Citation:

Zhou Yushu, Cao Jie, Wang Donghai. Application of generalized moist potential vorticity in non-uniformly saturated atmosphere to torrential rain forecast. J Appl Meteor Sci, 2007, 18(6): 754-759.

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Application of Generalized Moist Potential Vorticity in Non-uniformly Saturated Atmosphere to Torrential Rain Forecast

1.
Laboratory of Cloud-precipitation Physics and Severe Storms, Institute of Atmospheric Physics, CAS, Beijing 100029
2.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
3.
Graduate School, CAS, Beijing 100049

Received Date: 2007-03-30
Rev Recd Date: 2007-07-11
Publish Date: 2007-12-31

Abstract

Abstract

The introduction of generalized potential temperature and tendency equation of generalized moist potential vorticity into the thermodynamic framework is based on the non-uniform saturation of real atmosphere. The generalized moist potential vorticity (GMPV) equation is deduced by absorbing the generalized potential temperature. The water vapor and its gradient effect can be manifested in the GMPV equation, which indicates the convergence mechanism of water vapor at lower levels when torrential rain occurs. The GMPV anomaly is used in diagnostic studies of torrential rain both in North China and Yangtze River Basin. The results show that dynamic identification and forecasting of torrential rain from the perspective of generalized moist potential vorticity and its anomaly are effective, which maybe provide a new thought for the operational application of the GMPV.
- non-uniform saturation;
- generalized moist potential vorticity;
- torrential rain

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References(25)

Figures and Tables

图 1 2001年7月27日06:00地面6 h降水实况 (单位:mm)(a) 与850 hPa广义湿位涡 (单位:PVU; 阴影区是广义湿位涡值≥1.5 PVU的区域, 1 PVU=10 ^-6K·m³·kg ^-1·s ^-1)(b)

Fig. 1 Horizontal distribution of 6-hour precipitation from observation (unit:mm)(a), generalized moist potential vorticity at 850 hPa (unit:PVU; the shade area represents the generalized moist potential vorticity value≥1.5 PVU)(b) at 06:00 on July 27, 2001

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图 2 2003年7月9日00:00地面6 h降水实况 (单位:mm)(a) 与925 hPa广义湿位涡 (单位:PVU; 阴影区是广义湿位涡值≥1.5 PVU的区域)(b)

Fig. 2 Horizontal distribution of 6-hour precipitation from observation (unit:mm)(a), generalized moist potential vorticity at 925 hPa (unit:PVU, the shade area represents the generalized moist potential vorticity value≥1.5 PVU)(b) at 00:00 on July 9, 2003

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图 3 2001年7月27日06:00沿暴雨中心的广义湿位涡沿115°E垂直剖面 (a) 和沿37°N垂直剖面 (b)(单位:PVU)

Fig. 3 Meridional distribution along 115°E (a) and zonal distribution along 37°N (b) of generalized moist potential vorticity at 06:00 on July 27, 2001(unit:PVU)

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图 4 暴雨中心点不同高度处广义湿位涡倾向的时间演变 (单位:10 ^-8 PVU·s ^-1)(a)37°N, 115°E处2001年7月26日06:00—27日18:00, (b)33°N, 119°E处2003年7月7日18:00—9日06:00

Fig. 4 The generalized moist potential vorticity tendency evolution of the torrential rain center at 37°N, 115°E from 06:00 on July 26 to 18:00 on July 27, 2001 (a) and at 33°N, 119°E from 18:00 on July 7 to 06:00 on July 9, 2003 (b)(unit:PVU·s ^-1)

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