The Response of Large-Scale Circulation to Obliquity-Induced Changes in Meridional Heating GradientsSource: Journal of Climate:;2014:;volume( 027 ):;issue: 014::page 5504Author:Mantsis, Damianos F.
,
Lintner, Benjamin R.
,
Broccoli, Anthony J.
,
Erb, Michael P.
,
Clement, Amy C.
,
Park, Hyo-Seok
DOI: 10.1175/JCLI-D-13-00526.1Publisher: American Meteorological Society
Abstract: he inter- and intrahemispheric climate responses to a change in obliquity are investigated using the Geophysical Fluid Dynamics Laboratory Climate Model, version 2.1. (GFDL CM2.1). Reduced obliquity causes a weakening of the seasonal insolation contrast between the summer and winter hemispheres and a strengthening of the meridional insolation gradient within the summer hemisphere. The interhemispheric insolation change is associated with weakening of the cross-equatorial Hadley circulation and reduced heat transport from the summer hemisphere to the winter hemisphere, in both the ocean and atmosphere. In contrast, the intrahemispheric insolation change is associated with increased midlatitude summer eddy activity as seen by the increased atmospheric heat transport at those latitudes. Analysis of the zonal mean atmospheric meridional overturning circulation on isentropic surfaces confirms the increase of the midlatitude eddy circulation, which is driven by changes of sensible and latent heat fluxes, as well as changes in the stratification or distribution of entropy. It is suggested that the strengthening of this circulation is associated with an equatorward shift of the ascending branch of the winter Hadley cell.
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contributor author | Mantsis, Damianos F. | |
contributor author | Lintner, Benjamin R. | |
contributor author | Broccoli, Anthony J. | |
contributor author | Erb, Michael P. | |
contributor author | Clement, Amy C. | |
contributor author | Park, Hyo-Seok | |
date accessioned | 2017-06-09T17:09:19Z | |
date available | 2017-06-09T17:09:19Z | |
date copyright | 2014/07/01 | |
date issued | 2014 | |
identifier issn | 0894-8755 | |
identifier other | ams-80239.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4223109 | |
description abstract | he inter- and intrahemispheric climate responses to a change in obliquity are investigated using the Geophysical Fluid Dynamics Laboratory Climate Model, version 2.1. (GFDL CM2.1). Reduced obliquity causes a weakening of the seasonal insolation contrast between the summer and winter hemispheres and a strengthening of the meridional insolation gradient within the summer hemisphere. The interhemispheric insolation change is associated with weakening of the cross-equatorial Hadley circulation and reduced heat transport from the summer hemisphere to the winter hemisphere, in both the ocean and atmosphere. In contrast, the intrahemispheric insolation change is associated with increased midlatitude summer eddy activity as seen by the increased atmospheric heat transport at those latitudes. Analysis of the zonal mean atmospheric meridional overturning circulation on isentropic surfaces confirms the increase of the midlatitude eddy circulation, which is driven by changes of sensible and latent heat fluxes, as well as changes in the stratification or distribution of entropy. It is suggested that the strengthening of this circulation is associated with an equatorward shift of the ascending branch of the winter Hadley cell. | |
publisher | American Meteorological Society | |
title | The Response of Large-Scale Circulation to Obliquity-Induced Changes in Meridional Heating Gradients | |
type | Journal Paper | |
journal volume | 27 | |
journal issue | 14 | |
journal title | Journal of Climate | |
identifier doi | 10.1175/JCLI-D-13-00526.1 | |
journal fristpage | 5504 | |
journal lastpage | 5516 | |
tree | Journal of Climate:;2014:;volume( 027 ):;issue: 014 | |
contenttype | Fulltext |