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Sources of Tropospheric Ozone along the Asian Pacific Rim: An Analysis of Ozonesonde ObservationsThe sources contributing to tropospheric ozone over the Asian Pacific Rim in different seasons are quantified by analysis of Hong Kong and Japanese ozonesonde observations with a global three-dimensional (3-D) chemical transport model (GEOS-CHEM) driven by assimilated meteorological observations. Particular focus is placed on the extensive observations available from Hong Kong in 1996. In the middle-upper troposphere (MT- UT), maximum Asian pollution influence along the Pacific Rim occurs in summer, reflecting rapid convective transport of surface pollution. In the lower troposphere (LT) the season of maximum Asian pollution influence shifts to summer at midlatitudes from fall at low latitudes due to monsoonal influence. The UT ozone minimum and high variability observed over Hong Kong in winter reflects frequent tropical intrusions alternating with stratospheric intrusions. Asian biomass burning makes a major contribution to ozone at less than 32 deg.N in spring. Maximum European pollution influence (less than 5 ppbv) occurs in spring in the LT. North American pollution influence exceeds European influence in the UT-MT, reflecting the uplift from convection and the warm conveyor belts over the eastern seaboard of North America. African outflow makes a major contribution to ozone in the low-latitude MT-UT over the Pacific Rim during November- April. Lightning influence over the Pacific Rim is minimum in summer due to westward UT transport at low latitudes associated with the Tibetan anticyclone. The Asian outflow flux of ozone to the Pacific is maximum in spring and fall and includes a major contribution from Asian anthropogenic sources year-round.
Document ID
20040111407
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Liu, Hong-Yu
(Harvard Univ. Cambridge, MA, United States)
Jacob, Daniel J.
(Harvard Univ. Cambridge, MA, United States)
Chan, Lo Yin
(Hong Kong Polytechnic Hong Kong)
Oltmans, Samuel J.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Bey, Isabelle
(Harvard Univ. Cambridge, MA, United States)
Yantosca, Robert M.
(Harvard Univ. Cambridge, MA, United States)
Harris, Joyce M.
(National Oceanic and Atmospheric Administration Boulder, CO, United States)
Duncan, Bryan N.
(Harvard Univ. Cambridge, MA, United States)
Martin, Randall V.
(Harvard Univ. Cambridge, MA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Publication Information
Publication: Journal of Geophysical Research
Publisher: American Geophysical Union
Volume: 107
Issue: D21
ISSN: 0148-0227
Subject Category
Environment Pollution
Funding Number(s)
CONTRACT_GRANT: NAG1-2307
Distribution Limits
Public
Copyright
Other

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