A twentieth century perspective on summer Antarctic pressure change and variability and contributions from tropical SSTs and ozone depletion

During the late twentieth century, the Antarctic atmospheric circulation has changed and significantly influenced the overall Antarctic climate, through processes including a poleward shift of the circumpolar westerlies. However, little is known about the full spatial pattern of atmospheric pressure over the Antarctic continent prior to 1979. Here we investigate surface pressure changes across the entire Antarctic continent back to 1905 by developing a new summer pressure reconstruction poleward of 60 degrees S. We find that only across East Antarctica are the recent pressures significantly lower than pressures in the early twentieth century; we also discern periods of significant positive pressure trends in the early twentieth century across the coastal South Atlantic sector of Antarctica. Climate model simulations reveal that both tropical sea surface temperature variability and other radiative forcing mechanisms, in addition to ozone depletion, have played an important role in forcing the recent observed negative trends.

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Copyright 2017 American Chemical Society.

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Author Fogt, Ryan L.
Goergens, Chad A.
Jones, Julie M.
Schneider, David P.
Nicolas, Julien P.
Bromwich, David H.
Dusselier, Hallie E.
Publisher UCAR/NCAR - Library
Publication Date 2017-10-06T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:18:28.189359
Metadata Record Identifier edu.ucar.opensky::articles:21150
Metadata Language eng; USA
Suggested Citation Fogt, Ryan L., Goergens, Chad A., Jones, Julie M., Schneider, David P., Nicolas, Julien P., Bromwich, David H., Dusselier, Hallie E.. (2017). A twentieth century perspective on summer Antarctic pressure change and variability and contributions from tropical SSTs and ozone depletion. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d7ns0xgd. Accessed 26 September 2023.

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