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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. American Meteorological Society. doi: 10.1175/2011JAS3654.1.

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


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.

Item URL in elib:https://elib.dlr.de/70116/
Document Type:Article
Title:Stochastic Forcing of Potential Vorticity: Observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Egger, JosephUniv. München, MünchenUNSPECIFIED
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1175/2011JAS3654.1
Page Range:pp. 1340-1346
Publisher:American Meteorological Society
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 - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Freund, Jana
Deposited On:16 Jun 2011 16:03
Last Modified:06 Sep 2019 15:27

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