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.

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

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

    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

    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)

    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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    • Received : 2007-03-30
    • Accepted : 2007-07-11
    • Published : 2007-12-31

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