DIAGNOSTIC ANALYSIS OF MOIST POTENTIAL VORTICITY ANOMALY IN TORRENTIAL RAIN SYSTEMS

Gao Shouting; Lei Ting; Zhou Yushu

Vol.13, NO.6, 2002

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Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(6): 662-670

Gao Shouting, Lei Ting, Zhou Yushu. Diagnostic analysis of moist potential vorticity anomaly in torrential rain systems. J Appl Meteor Sci, 2002, 13(6): 662-670.

Citation:

Gao Shouting, Lei Ting, Zhou Yushu. Diagnostic analysis of moist potential vorticity anomaly in torrential rain systems. J Appl Meteor Sci, 2002, 13(6): 662-670.

Gao Shouting, Lei Ting, Zhou Yushu. Diagnostic analysis of moist potential vorticity anomaly in torrential rain systems. J Appl Meteor Sci, 2002, 13(6): 662-670.

Citation:

Gao Shouting, Lei Ting, Zhou Yushu. Diagnostic analysis of moist potential vorticity anomaly in torrential rain systems. J Appl Meteor Sci, 2002, 13(6): 662-670.

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DIAGNOSTIC ANALYSIS OF MOIST POTENTIAL VORTICITY ANOMALY IN TORRENTIAL RAIN SYSTEMS

1.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029
2.
National Climate Center, Beijing 100081

Received Date: 2001-01-07
Rev Recd Date: 2002-04-18
Publish Date: 2002-12-31

Abstract

Abstract

The moist potential vorticity (MPV) equation with both heat and mass forcing is derived. It is clarified that both heat and mass forcing induced by the intensive precipitation in torrential rain systems can lead to moist potential vorticity anomaly. With NCEP/NCAR 1°×1° data, the moist potential vorticity anomaly is diagnosed along the Yangtze River from June 23 to June 26 1999. The results indicate that moist potential vorticity anomaly occurs between 700 hPa and 500 hPa, and the maximum anomaly value is up to 1.4 PVU. Both dynamical and diagnostic methods reveal that moist potential vorticity anomaly regions correspond well to the regions of intensive precipitation.
- Moist potential vorticity (MPV);
- Heat forcing;
- Mass Forcing;
- Torrential rain

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References(6)

Figures and Tables

图 1 1999 年6 月23 日08 :00 700 hPa 上湿位涡分布

(单位:PVU,虚线是相当位温单位:K)

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图 2 1999 年6 月23 日08 :00 降水实况(单位:mm)

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图 3 1999 年6 月26 日08 :00 700 hPa 上湿位涡分布

(单位:PVU,虚线为相当位温单位:K)

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图 4 1999 年6 月26 日08 :00 降水实况(单位:mm)

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图 5 1999 年6 月26 日08 :00 由质量强迫造成的湿位涡变化

(单位:10^-6 PV U/s)

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图 6 1999 年6 月26 日08 :00 由热力强迫造成的湿位涡变化

(单位:10^-6 PV U/s)

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图 7 1999 年6 月24 日08 :00 湿位涡(单位:PVU,实线>0,虚线<0) 和相当位温(单位:K,长虚线)沿116°E 的垂直剖面

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图 8 1999 年6 月26 日08 :00 湿位涡(单位:PVU,实线>0,虚线<0)) 和相当位温(单位:K,长虚线)沿117°E 的垂直剖面

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References

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