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    Biases in the calculation of Southern Hemisphere mean baroclinic eddy growth rate

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    Biases in the calculation of Southern Hemisphere mean baroclinic eddy growth rate (636.6Kb)

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    Author
    SIMMONDS, IAN; LIM, EUN-PA
    Date
    2009
    Source Title
    Geophysical Research Letters
    Publisher
    American Geophysical Union
    University of Melbourne Author/s
    Simmonds, Ian
    Affiliation
    Science - Earth Sciences
    Metadata
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    Document Type
    Journal Article
    Citations
    Simmonds, I. & Lim, E. (2009). Biases in the calculation of Southern Hemisphere mean baroclinic eddy growth rate. Geophysical Research Letters, 36, doi:10.1029/2008GL036320.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/32754
    Description

    © 2009 American Geophysical Union

    Abstract
    The maximum Eady growth rate measure of baroclinic instability is very commonly used in the literature. Its average is usually calculated directly from the time-mean flow. It is suggested here that this approach is not entirely suitable, but rather one should obtain the Eady growth rates at all relevant synoptic times and average these. It is found at the 850 hPa level in the Southern Hemisphere that the time-mean of the instantaneous rates exceed those calculated from the time-mean field over much of the mid and high latitudes, and the difference is even more marked at 500 hPa. At both levels the axes of the maxima Eady growth rates are displaced to the south. Some implications are discussed, including the need for caution when diagnosing changes in cyclone properties from changes in Eady growth rate calculated directly from the time-mean flow in climate change model simulations.
    Keywords
    Eady growth rate; baroclinicity; Southern Hemisphere extratropical cyclones

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