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Late‐spring increase of trans‐Pacific pollution transport in the upper troposphere
Author(s) -
Wang Yuhang,
Choi Yunsoo,
Zeng Tao,
Ridley Brian,
Blake Nicola,
Blake Donald,
Flocke Frank
Publication year - 2006
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 - 10.1029/2005gl024975
Subject(s) - troposphere , subsidence , environmental science , ozone , atmospheric sciences , spring (device) , climatology , equinox , tropospheric ozone , pollutant , latitude , geology , meteorology , geography , chemistry , mechanical engineering , paleontology , geodesy , organic chemistry , structural basin , engineering
The observations during the Tropospheric Ozone Production about the Spring Equinox (TOPSE) experiment show large enhancements of NO x , PAN, O 3 , CO, CFCs, and Halon‐1211 in the upper troposphere over North America in late spring. Analysis of these observations and model results indicate that the enhancements are most likely driven by a surge of trans‐Pacific pollutant transport in late spring. The rapid seasonal transition is particularly striking for upper tropospheric NO x , resulting in large increases in photochemical oxidation and O 3 production during the period. The transition is later in season than that of low‐altitude trans‐Pacific transport, which peaks in March and April. The current generation of global chemical transport models clearly underestimates this long‐range transport of pollutants, implying an underestimation in the model‐projected impact on regional air quality over North America (through subsidence).