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Kang, Sarah M.
Climate Dynamics Lab
Research Interests
  • Climate change, ITCZ, Atmospheric general circulation, Polar amplification

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Impact of Polar Ozone Depletion on Subtropical Precipitation

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Title
Impact of Polar Ozone Depletion on Subtropical Precipitation
Author
Kang, Sarah M.Polvani, L. M.Fyfe, J. C.Sigmond, M.
Keywords
SOUTHERN ANNULAR MODE; HEMISPHERE CLIMATE-CHANGE; GLOBAL PRECIPITATION; PART II; TRENDS; ICE; CIRCULATION; REANALYSIS; ATMOSPHERE
Issue Date
2011-05
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.332, no.6032, pp.951 - 954
Abstract
Over the past half-century, the ozone hole has caused a poleward shift of the extratropical westerly jet in the Southern Hemisphere. Here, we argue that these extratropical circulation changes, resulting from ozone depletion, have substantially contributed to subtropical precipitation changes. Specifically, we show that precipitation in the southern subtropics in austral summer increases significantly when climate models are integrated with reduced polar ozone concentrations. Furthermore, the observed patterns of subtropical precipitation change, from 1979 to 2000, are very similar to those in our model integrations, where ozone depletion alone is prescribed. In both climate models and observations, the subtropical moistening is linked to a poleward shift of the extratropical westerly jet. Our results highlight the importance of polar regions for the subtropical hydrological cycle.
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DOI
10.1126/science.1202131
ISSN
0036-8075
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UEE_Journal Papers
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