A Modified Moist Ageostrophic  Q Vector

YUE Caijun; SHOU Shaowen

doi:10.1007/s00376-008-1053-x

Impact Factor: 5.8

Volume 25 Issue 6

Nov. 2008

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Article > ADVANCES IN ATMOSPHERIC SCIENCES > 2008 > 25(6): 1053-1061

A Modified Moist Ageostrophic Q Vector

1.
Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030； Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai 200030;School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044

doi: 10.1007/s00376-008-1053-x

Abstract
References
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Abstract:
The quasi-geostrophic ${\boldsymbol Q}$ vector is an important diagnostic tool for studying development of surface rainfall associated with large-scale weather systems and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.
- moist ageostrophic Q vector,
- modification,
- latent heating,
- torrential rainfall associated with mei-yu front
References

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Manuscript History

Manuscript received: 10 November 2008

Manuscript revised: 10 November 2008

通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

A Modified Moist Ageostrophic Q Vector

1. Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030； Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai 200030;School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044

Manuscript received: 2008-11-10
Manuscript revised: 2008-11-10

Abstract: The quasi-geostrophic ${\boldsymbol Q}$ vector is an important diagnostic tool for studying development of surface rainfall associated with large-scale weather systems and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.

Keywords: