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Original Research Papers

Piecewise potential vorticity diagnosis of the development of a polar low over the Sea of Japan

Authors:

Longtao Wu ,

Department of Atmospheric and Oceanic Sciences University of Wisconsin-Madison, Madison, WI 53706, US
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Jonathan E. Martin,

Department of Atmospheric and Oceanic Sciences University of Wisconsin-Madison, Madison, WI 53706, US
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Grant W. Petty

Department of Atmospheric and Oceanic Sciences University of Wisconsin-Madison, Madison, WI 53706, US
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Abstract

The piecewise potential vorticity (PV) inversion method developed by Davis and Emanuel (1991) is used to diagnose the development processes of a polar low over the Sea of Japan in December 2003. The synoptic scale-balanced flows associated with the polar low are successfully captured using the inversion method. It is shown that, antecedent to the development of the polar low, a positive lower-tropospheric temperature anomaly was induced by the approach of a positive tropopause-level PV anomaly over the northern Sea of Japan. The analysis suggests that the polar low was initiated as a result of the combined effect of the positive PV anomaly near the tropopause and the near-surface positive temperature anomaly. The rapid height falls in the lower troposphere were primarily contributed by the upper tropospheric PV anomaly. Further intensification of the polar low was afforded by latent heat release associated with cloud and precipitation processes. After the polar low moved over northern Honshu, quick dissipation was primarily rendered by the thinning and elongating of the upper level PV anomaly that led to a rapid reduction of the lower troposphere height perturbations associated with it.

How to Cite: Wu, L., Martin, J.E. and Petty, G.W., 2011. Piecewise potential vorticity diagnosis of the development of a polar low over the Sea of Japan. Tellus A: Dynamic Meteorology and Oceanography, 63(2), pp.198–211. DOI: http://doi.org/10.1111/j.1600-0870.2010.00494.x
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  Published on 01 Jan 2011
 Accepted on 22 Dec 2010            Submitted on 6 Jul 2010

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