The impact of boreal summer ENSO events on tropical lower stratospheric ozone

The interannual variability of tropical lower stratosphere ozone and its connections to sea surface temperatures in the equatorial Pacific are examined using a combination of chemistry climate model simulations, satellite observations, and reanalyses. The model simulations and observations show large differences in the magnitude of interannual variability in ozone between northern tropic (NT; EQ‐18° N) and southern tropic (EQ‐18° S) during boreal summer but small differences in winter. The interannual variability during boreal summer is highly correlated with summer sea surface temperatures in the eastern and central Pacific Ocean and El Niño–Southern Oscillation (ENSO) events. Larger variability in NT ozone is primarily due to meridional advection, connected to the changes in the onset date and strength of the Asian summer monsoon anticyclone. The Asian summer monsoon anticyclone forms earlier in a season and tends to be stronger during cold (La Niña) events leading to more isentropic transport of ozone from the extratropics into the NT, with the reverse for warm (El Niño) events.

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Copyright 2018 American Geophysical Union.

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Author Tweedy, Olga V.
Waugh, Darryn W.
Randel, William J.
Abalos, Marta
Oman, Luke D.
Kinnison, Doug E.
Publisher UCAR/NCAR - Library
Publication Date 2018-09-16T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-04-14T21:42:02.214906
Metadata Record Identifier edu.ucar.opensky::articles:22001
Metadata Language eng; USA
Suggested Citation Tweedy, Olga V., Waugh, Darryn W., Randel, William J., Abalos, Marta, Oman, Luke D., Kinnison, Doug E.. (2018). The impact of boreal summer ENSO events on tropical lower stratospheric ozone. UCAR/NCAR - Library. Accessed 03 June 2023.

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