Comments on “The Evolution and Dynamical Role of Reduced Upper-Tropospheric Potential Vorticity in Intensive Observing Period One of FASTEX”

Stoelinga, Mark T.
August 2003
Monthly Weather Review;Aug2003 Parts 1 and 2, Vol. 131 Issue 8, p1944
Academic Journal
Using trajectory-based PV diagnosis on a case of extratropical cyclogenesis, Pomroy and Thorpe attempted to demonstrate that diabatic reduction of PV through direct Lagrangian change produces negative PV anomalies at the tropopause level that are comparable in importance to the diabatically produced positive PV anomaly in the lower troposphere. However, because they did not consider the indirect effect of latent heating in enhancing advection of PV at the tropopause, which previous studies had shown to be dominant over the direct effect, their finding of dynamically significant upper-level negative PV anomalies remains unreconciled with the results of those previous studies.


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