Subtropical Potential Vorticity Intrusion Drives Increasing Tropospheric Ozone over the Tropical Central Pacific.

(c) Decadal trend in Ozone concentration During boreal winter months we observe an increasing decadal trend (2 to 3 DU/decade) over the outer tropical central Pacific and a decreasing trend (−9 to −10 DU/decade) over the midlatitudes (30–45°N) in total columnar ozone measurements from Total Ozone Mapping Spectrometer (TOMS, 1983–2012, Fig. 4a ).

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To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ Abstract Drawn from multiple reanalysis datasets, an increasing trend and westward shift in the number of Potential Vorticity intrusion events over the Pacific are evident.

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