The three-dimensional distribution of clouds around Southern Hemisphere extratropical cyclones

Pallavi Govekar, Christian Jakob, Michael Reeder, John Haynes

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The organization and, for the first time, the three-dimensional structure of clouds associated with the Southern Hemisphere cyclones are studied using active observations from the CloudSat and CALIPSO satellites. First, a composite cyclone is constructed from more than 800 individual cases in the years 2007 and 2008 using the cyclone centre as the composite reference point. It is shown that the three-dimensional cloud distribution around the composite cyclone agrees well with conceptual models of extratropical cyclones. Composite mean fields of sea level pressure, vertical motion, potential temperature and relative humidity are superposed on the three-dimensional cloud structure to better define the relationship between the clouds and dynamical properties of extratropical cyclones. The methodology used here reveals the relationship between dynamical and cloud processes in three dimensions around cyclones and provides the foundation for in-depth evaluations of the ability of climate models to simulate the cloud and dynamical structures of Southern Hemisphere extratropical cyclones.
Original languageEnglish
Pages (from-to)1 - 6
Number of pages6
JournalGeophysical Research Letters
Volume38
Issue numberL21805
DOIs
Publication statusPublished - 2011

Cite this

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title = "The three-dimensional distribution of clouds around Southern Hemisphere extratropical cyclones",
abstract = "The organization and, for the first time, the three-dimensional structure of clouds associated with the Southern Hemisphere cyclones are studied using active observations from the CloudSat and CALIPSO satellites. First, a composite cyclone is constructed from more than 800 individual cases in the years 2007 and 2008 using the cyclone centre as the composite reference point. It is shown that the three-dimensional cloud distribution around the composite cyclone agrees well with conceptual models of extratropical cyclones. Composite mean fields of sea level pressure, vertical motion, potential temperature and relative humidity are superposed on the three-dimensional cloud structure to better define the relationship between the clouds and dynamical properties of extratropical cyclones. The methodology used here reveals the relationship between dynamical and cloud processes in three dimensions around cyclones and provides the foundation for in-depth evaluations of the ability of climate models to simulate the cloud and dynamical structures of Southern Hemisphere extratropical cyclones.",
author = "Pallavi Govekar and Christian Jakob and Michael Reeder and John Haynes",
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journal = "Geophysical Research Letters",
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The three-dimensional distribution of clouds around Southern Hemisphere extratropical cyclones. / Govekar, Pallavi; Jakob, Christian; Reeder, Michael; Haynes, John.

In: Geophysical Research Letters, Vol. 38, No. L21805, 2011, p. 1 - 6.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The three-dimensional distribution of clouds around Southern Hemisphere extratropical cyclones

AU - Govekar, Pallavi

AU - Jakob, Christian

AU - Reeder, Michael

AU - Haynes, John

PY - 2011

Y1 - 2011

N2 - The organization and, for the first time, the three-dimensional structure of clouds associated with the Southern Hemisphere cyclones are studied using active observations from the CloudSat and CALIPSO satellites. First, a composite cyclone is constructed from more than 800 individual cases in the years 2007 and 2008 using the cyclone centre as the composite reference point. It is shown that the three-dimensional cloud distribution around the composite cyclone agrees well with conceptual models of extratropical cyclones. Composite mean fields of sea level pressure, vertical motion, potential temperature and relative humidity are superposed on the three-dimensional cloud structure to better define the relationship between the clouds and dynamical properties of extratropical cyclones. The methodology used here reveals the relationship between dynamical and cloud processes in three dimensions around cyclones and provides the foundation for in-depth evaluations of the ability of climate models to simulate the cloud and dynamical structures of Southern Hemisphere extratropical cyclones.

AB - The organization and, for the first time, the three-dimensional structure of clouds associated with the Southern Hemisphere cyclones are studied using active observations from the CloudSat and CALIPSO satellites. First, a composite cyclone is constructed from more than 800 individual cases in the years 2007 and 2008 using the cyclone centre as the composite reference point. It is shown that the three-dimensional cloud distribution around the composite cyclone agrees well with conceptual models of extratropical cyclones. Composite mean fields of sea level pressure, vertical motion, potential temperature and relative humidity are superposed on the three-dimensional cloud structure to better define the relationship between the clouds and dynamical properties of extratropical cyclones. The methodology used here reveals the relationship between dynamical and cloud processes in three dimensions around cyclones and provides the foundation for in-depth evaluations of the ability of climate models to simulate the cloud and dynamical structures of Southern Hemisphere extratropical cyclones.

UR - http://www.agu.org/journals/gl/gl1121/2011GL049091/2011GL049091.pdf

U2 - 10.1029/2011GL049091

DO - 10.1029/2011GL049091

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JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - L21805

ER -