Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/79719
Title: Isentropic zonal average formalism and the near-surface circulation
Authors: Koh, Tieh Yong
Plumb, Alan R.
Keywords: DRNTU::Science::Astronomy
Issue Date: 2003
Source: Koh, T. Y. & Plumb, R. A. (2003). Isentropic zonal average formalism and the near-surface circulation. Proceedings of the 14th Conference on Atmospheric and Oceanic Fluid Dynamics, American Meteorological Society, 9-13 June 2003.
Conference: Proceedings of the Conference on Atmospheric and Oceanic Fluid Dynamics, American Meteorological Society (14th : 2003)
Abstract: Hoskins (1991) proposed dividing the atmosphere into 3 regions: Overworld, Middleworld and Underworld, using potential temperature θ and potential vorticity (PV) as reference (Fig. 1). In the Underworld (θ < 300 K), isentropes intercept the Earth’s surface and a direct isentropic zonal average circulation exists in the mid-latitudes. Held and Schneider (1999) suggested that this circulation may be understood as follows: the equator-pole temperature gradient determines the near-surface eddy heat flux via an eddydiffusion mechanism. The poleward eddy heat flux in turn drives an equatorward mean flow next to the surface whose horizontal convergence in the subtropics forces the mean quasi-isentropic ascent of air into the troposphere. Radiative cooling causes air to sink back to the surface, thus closing the circulation.
URI: https://hdl.handle.net/10356/79719
http://hdl.handle.net/10220/20355
Rights: © 2003 The Author(s). This is the author created version of a work that has been peer reviewed and accepted for publication by Proceedings of the 14th Conference on Atmospheric and Oceanic Fluid Dynamics, American Meteorological Society, 9-13 June 2003. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EOS Conference Papers

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