Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211814l&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 11, CiteID L11814
Physics
7
Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Geographic Location: North America, Geographic Location: Europe, Geographic Location: Asia
Scientific paper
We estimate the average time required for inter-continental transport of atmospheric tracers based on simulations with the global chemical tracer model MOZART-2 driven with NCEP meteorology. We represent the average transport time by a ratio of the concentration of two tracers with different lifetimes. We find that average transport times increase with tracer lifetimes. With tracers of 1- and 2-week lifetimes the average transport time from East Asia (EA) to the surface of western North America (NA) in April is 2-3 weeks, approximately a half week longer than transport from NA to western Europe (EU) and from EU to EA. We develop an `equivalent circulation' method to estimate a timescale which has little dependence on tracer lifetimes and obtain similar results to those obtained with short-lived tracers. Our findings show that average inter-continental transport times, even for tracers with short lifetimes, are on average 1-2 weeks longer than rapid transport observed in plumes.
Liu Junfeng
Mauzerall Denise L.
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