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Dependence of model‐simulated response to ozone depletion on stratospheric polar vortex climatology
Author(s) -
Lin Pu,
Paynter David,
Polvani Lorenzo,
Correa Gustavo J. P.,
Ming Yi,
Ramaswamy V.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl073862
Subject(s) - polar vortex , ozone depletion , climatology , polar , atmospheric sciences , environmental science , sudden stratospheric warming , ozone layer , climate model , ozone , atmospheric model , stratosphere , vortex , polar night , climate change , meteorology , geology , physics , oceanography , astronomy
We contrast the responses to ozone depletion in two climate models: Community Atmospheric Model version 3 (CAM3) and Geophysical Fuild Dynamics Laboratory (GFDL) AM3. Although both models are forced with identical ozone concentration changes, the stratospheric cooling simulated in CAM3 is 30% stronger than in AM3 in annual mean, and twice as strong in December. We find that this difference originates from the dynamical response to ozone depletion, and its strength can be linked to the timing of the climatological springtime polar vortex breakdown. This mechanism is further supported by a variant of the AM3 simulation in which the southern stratospheric zonal wind climatology is nudged to be CAM3‐like. Given that the delayed breakdown of the southern polar vortex is a common bias among many climate models, previous model‐based assessments of the forced responses to ozone depletion may have been somewhat overestimated.