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Stochastic Forcing of Potential Vorticity: Observations

Egger, Joseph and Hoinka, Klaus-Peter (2011) Stochastic Forcing of Potential Vorticity: Observations. Journal of the Atmospheric Sciences, 68, pp. 1340-1346. DOI: 10.1175/2011JAS3654.1.

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Official URL: http://journals.ametsoc.org/toc/atsc/68/6

Abstract

The linear theory of point correlation maps for synoptic systems relies so far mainly on specifications of stochastic forcing due to nonlinear processes that are not based on observations. Forty-year ECMWF Re- Analysis (ERA-40) data are used to derive time series of the forcing terms in a potential vorticity equation for a correlation point in the North Atlantic storm-track region. It is found that the forcing correlations are restricted to distances less than 1500 km to the correlation point in zonal direction and just a few hundred kilometers in meridional direction. The forcing is not even approximately white in time. Covariances of forcing and potential vorticity are presented as well. An advection equation with simple damping and realistic stochastic forcing is solved to approximate the observed covariances of forcing and potential vorticity.

Document Type:Article
Title:Stochastic Forcing of Potential Vorticity: Observations
Authors:
AuthorsInstitution or Email of Authors
Egger, JosephUniv. München, München
Hoinka, Klaus-PeterUNSPECIFIED
Date:2011
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:68
DOI:10.1175/2011JAS3654.1
Page Range:pp. 1340-1346
Status:Published
Keywords:mountain torque, ERA40
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:16 Jun 2011 16:03
Last Modified:07 Feb 2013 20:13

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