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Western Pacific tropospheric ozone and potential vorticity: Implications for Asian pollution
Author(s) -
Newell Reginald E.,
Browell Edward V.,
Davis Douglas D.,
Liu Shaw C.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl02799
Subject(s) - troposphere , stratosphere , potential vorticity , subsidence , atmospheric sciences , environmental science , climatology , intertropical convergence zone , ozone , pollution , southern hemisphere , vorticity , geology , meteorology , precipitation , geography , vortex , ecology , biology , paleontology , structural basin
Tropospheric ozone (O 3 ) cross sections measured with lidar from a DC‐8 aircraft over the western Pacific correspond closely with potential vorticity (PV). Both are transported from the middle latitude stratosphere, although this is not the only source of O 3 , and both have sinks in the tropical boundary layer. O 3 and PV are good indicators of photochemical and transport process interactions. In summer, some Asian pollution, raised by convection to the upper troposphere, passes southward into the tropics and to the Southern Hemisphere. In winter, subsidence keeps the pollution at low altitudes where it moves over the ocean towards the ITCZ, with photochemical destruction and secondary pollutant generation occurring en route. Convection raises this modified air to the upper troposphere, where some may enter the stratosphere. Thus winter Asian pollution may have a smaller direct influence on the global atmosphere than it would if injected at other longitudes and seasons.