The Signature of Southern Hemisphere Atmospheric Circulation Patterns in Antarctic Precipitation

We provide the first comprehensive analysis of the relationships between large‐scale patterns of Southern Hemisphere climate variability and the detailed structure of Antarctic precipitation. We examine linkages between the high spatial resolution precipitation from a regional atmospheric model and...

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Vydáno v:Geophysical research letters Ročník 44; číslo 22; s. 11,580 - 11,589
Hlavní autoři: Marshall, Gareth J., Thompson, David W. J., Broeke, Michiel R.
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States John Wiley & Sons, Inc 28.11.2017
John Wiley and Sons Inc
Témata:
Antarctic climate
Antarctic Oscillation
Antarctic precipitation
Antarctica
Arctic and Antarctic oceanography
Atmospheric circulation
Atmospheric circulation patterns
Atmospheric models
Atmospheric Processes
Atmospheric variability
Biogeosciences
circulation
Circulation patterns
Climate
Climate and Interannual Variability
Climate Change and Variability
Climate Dynamics
Climate models
Climate Variability
Climatology
Cryosphere
Decadal Ocean Variability
Extreme weather
Fluxes
Geodesy and Gravity
Geographic Location
Global Change
Mass Balance
Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions
Oceanography: General
Oceanography: Physical
Oceans
Precipitation
Precipitation variability
Research Letter
Research Letters
Southern Hemisphere
Spatial discrimination
Spatial resolution
Teleconnection patterns
Variability
precipitation
Antarctica
climate
mass balance
circulation
ISSN:0094-8276, 1944-8007
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Shrnutí:We provide the first comprehensive analysis of the relationships between large‐scale patterns of Southern Hemisphere climate variability and the detailed structure of Antarctic precipitation. We examine linkages between the high spatial resolution precipitation from a regional atmospheric model and four patterns of large‐scale Southern Hemisphere climate variability: the southern baroclinic annular mode, the southern annular mode, and the two Pacific‐South American teleconnection patterns. Variations in all four patterns influence the spatial configuration of precipitation over Antarctica, consistent with their signatures in high‐latitude meridional moisture fluxes. They impact not only the mean but also the incidence of extreme precipitation events. Current coupled‐climate models are able to reproduce all four patterns of atmospheric variability but struggle to correctly replicate their regional impacts on Antarctic climate. Thus, linking these patterns directly to Antarctic precipitation variability may allow a better estimate of future changes in precipitation than using model output alone. Key Points The primary Southern Hemisphere extratropical circulation patterns all influence the spatial distribution of Antarctic precipitation They impact not only the mean but also the incidence of extreme precipitation events Locally, extreme precipitation may be associated especially with one polarity of a circulation pattern
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ISSN:0094-8276
1944-8007
DOI:10.1002/2017GL075998