Ozone Loss and Recovery and the Preconditioning of Upward-Propagating Planetary Wave ActivitySource: Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012::page 3977DOI: 10.1175/JAS-D-12-0259.1Publisher: American Meteorological Society
Abstract: mechanistic chemistry?dynamical model is used to evaluate the relative importance of radiative, photochemical, and dynamical feedbacks in communicating changes in lower-stratospheric ozone to the circulation of the stratosphere and lower mesosphere. Consistent with observations and past modeling studies of Northern Hemisphere late winter and early spring, high-latitude radiative cooling due to lower-stratospheric ozone depletion causes an increase in the modeled meridional temperature gradient, an increase in the strength of the polar vortex, and a decrease in vertical wave propagation in the lower stratosphere. Moreover, it is shown that, as planetary waves pass through the ozone loss region, dynamical feedbacks precondition the wave, causing a large increase in wave amplitude. The wave amplification causes an increase in planetary wave drag, an increase in residual circulation downwelling, and a weaker polar vortex in the upper stratosphere and lower mesosphere. The dynamical feedbacks responsible for the wave amplification are diagnosed using an ozone-modified refractive index; the results explain recent chemistry?coupled climate model simulations that suggest a link between ozone depletion and increased polar downwelling. The effects of future ozone recovery are also examined and the results provide guidance for researchers attempting to diagnose and predict how stratospheric climate will respond specifically to ozone loss and recovery versus other climate forcings including increasing greenhouse gas abundances and changing sea surface temperatures.
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contributor author | Albers, John R. | |
contributor author | Nathan, Terrence R. | |
date accessioned | 2017-06-09T16:55:47Z | |
date available | 2017-06-09T16:55:47Z | |
date copyright | 2013/12/01 | |
date issued | 2013 | |
identifier issn | 0022-4928 | |
identifier other | ams-76613.pdf | |
identifier uri | http://onlinelibrary.yabesh.ir/handle/yetl/4219080 | |
description abstract | mechanistic chemistry?dynamical model is used to evaluate the relative importance of radiative, photochemical, and dynamical feedbacks in communicating changes in lower-stratospheric ozone to the circulation of the stratosphere and lower mesosphere. Consistent with observations and past modeling studies of Northern Hemisphere late winter and early spring, high-latitude radiative cooling due to lower-stratospheric ozone depletion causes an increase in the modeled meridional temperature gradient, an increase in the strength of the polar vortex, and a decrease in vertical wave propagation in the lower stratosphere. Moreover, it is shown that, as planetary waves pass through the ozone loss region, dynamical feedbacks precondition the wave, causing a large increase in wave amplitude. The wave amplification causes an increase in planetary wave drag, an increase in residual circulation downwelling, and a weaker polar vortex in the upper stratosphere and lower mesosphere. The dynamical feedbacks responsible for the wave amplification are diagnosed using an ozone-modified refractive index; the results explain recent chemistry?coupled climate model simulations that suggest a link between ozone depletion and increased polar downwelling. The effects of future ozone recovery are also examined and the results provide guidance for researchers attempting to diagnose and predict how stratospheric climate will respond specifically to ozone loss and recovery versus other climate forcings including increasing greenhouse gas abundances and changing sea surface temperatures. | |
publisher | American Meteorological Society | |
title | Ozone Loss and Recovery and the Preconditioning of Upward-Propagating Planetary Wave Activity | |
type | Journal Paper | |
journal volume | 70 | |
journal issue | 12 | |
journal title | Journal of the Atmospheric Sciences | |
identifier doi | 10.1175/JAS-D-12-0259.1 | |
journal fristpage | 3977 | |
journal lastpage | 3994 | |
tree | Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012 | |
contenttype | Fulltext |