Drawn from multiple reanalysis datasets (ECMWF, NCEP, Japanese Reanalysis, MERRA, etc.), an increasing trend and westward shift in the number of PV intrusion events over the Pacific Ocean are observed 8 .
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Contrasting subtropical PV intrusion frequency and their impact on tropospheric Ozone distribution over Pacific Ocean in El-Niño and La-Niña conditions.
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The TOMS (total column) and AIRS (vertical profile) ozone concentration exhibits an increasing trend in the outer tropics and a decreasing trend in mid latitudes, which is in line with the trends in PV inducing equatorward transport and downward mixing of ozone from the midlatitude UT and lower stratosphere during PV intrusions.