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Sensitivity of the surface responses of an idealized AGCM to the timing of imposed ozone depletion‐like polar stratospheric cooling
Author(s) -
Sheshadri Aditi,
Plumb R. Alan
Publication year - 2016
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 - 10.1002/2016gl067964
Subject(s) - ozone depletion , atmospheric sciences , polar , climatology , environmental science , general circulation model , ozone layer , ozone , mode (computer interface) , radiative cooling , climate model , stratosphere , climate change , meteorology , geology , physics , oceanography , astronomy , computer science , operating system
An idealized atmospheric general circulation model (AGCM) is used to investigate the sensitivity of model responses to the timing of imposed polar stratospheric cooling, intended to mimic the radiative effects of ozone depletion. The model exhibits circulation responses to springtime cooling that qualitatively match both observations and the responses of comprehensive chemistry climate models. The model's surface response is sensitive to the timing of the cooling, with the onset becoming delayed with later cooling, but with the termination occurring at similar times, suggesting that the meteorology plays an important role. The model's responses do not match the latitudinal structure of the leading annular mode; rather, the response described by the second empirical orthogonal function plays a substantial role, in addition to the first. It is suggested that the imposed cooling, when it delays the final warming, results in an extended period of lower stratospheric variability, which could be an important factor in producing realistic surface responses.