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The Impact of Boreal Summer ENSO Events on Tropical Lower Stratospheric Ozone
Author(s) -
Tweedy Olga V.,
Waugh Darryn W.,
Randel William J.,
Abalos Marta,
Oman Luke D.,
Kinnison Doug E.
Publication year - 2018
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2018jd029020
Subject(s) - anticyclone , climatology , boreal , stratosphere , environmental science , sea surface temperature , atmospheric sciences , ozone , monsoon , advection , zonal and meridional , subtropics , ozone depletion , oceanography , geology , geography , meteorology , paleontology , physics , fishery , biology , thermodynamics
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.