Eddy Energy along the Tropical Storm Track in Association with ENSO

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概要

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• The interaction between the seasonal mean circulation and the transient eddies over the western North Pacific (WNP) during El Nino-Southern Oscillation (ENSO) warm and cold years was investigated by the three-dimensional eddy kinetic energy (EKE) and eddy available potential energy (EAPE) budget equations for total eddy, high-frequency (<10 days) and low-frequency (20-70 days) components. Composites of the energy results indicate that low-level anomalous cyclonic circulation, westerly jet and ascending motion associated with the eastward extension of warm SST during warm ENSO years are favorable for eddy barotropic energy conversion (CK) and eddy baroclinic energy conversions (CE). The enhancement of CK and CE might provide kinetic energy for the growth of high- and low-frequency transient eddies including tropical storms (TSs) from the Philippine Sea to the date line over the tropical WNP during warm ENSO years. In contrast, high- and low-frequency eddies convert EKE to seasonal mean circulation over the subtropical and mid-latitude WNP during warm years. Enhanced eddy baroclinic energy conversion plays an important role in the maintenance and enhancement of the subsequent development of transient eddies including TSs as they propagate northward. The loss of EAPE to EKE due to the eddy baroclinic energy conversion is mainly supplemented by the generation of EAPE associated with eddy diabatic heating. However, the energy conversion from mean available potential energy (MAPE) to EAPE is also important due to the eddy vertical heat transport which is neglected in the two-dimensional EAPE budget equation. It is suggested that high- and low-frequency eddies including TSs may be self-development and intensify through their enhanced diabatic heating and vertical heat transport.

• 2009-08-25

著者

• HSU Pang-Chi

  Department of Earth Sciences, National Taiwan Normal University

• TSOU Chih-Hua

  Department of Earth Sciences, National Taiwan Normal University

• HSU Huang-Hsiung

  Department of Atmospheric Sciences, National Taiwan University

• CHEN Jui-Hsin

  Department of Mathematics, National Central University

• Tsou Chih-hua

  Department Of Earth Sciences National Taiwan Normal University

• Hsu Huang-hsiung

  Department Of Atmospheric Sciences National Taiwan University

• Hsu Pang-chi

  Department Of Earth Sciences National Taiwan Normal University

• Chen Jui-hsin

  Department Of Mathematics National Central University

• Tsou Chin-Hua

  Department of Earth Sciences, National Taiwan Normal University

関連論文

• Eddy Energy along the Tropical Storm Track in Association with ENSO
• Sub-Monthly Circulation Features Associated with Tropical Cyclone Tracks over the East Asian Monsoon Area during July-August Season
• Simulation of the 1998 East Asian Summer Monsoon using the Purdue Regional Model(Regional Climate Modeling for Monsoon System)
• Northward and Northwestward Propagation of 30-60 Day Oscillation in the Tropical and Extratropical Western North Pacific
• Stratospheric Antarctic Intraseasonal Oscillation during the Austral Winter

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