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Long-range Transport of Asian Pollution to North America: Transport, chemistry and variability

Long-range Transport of Asian Pollution to North America: Transport, chemistry and variability. Qing Liang and Lyatt Jaegl é University of Washington, Seattle. Meteorological Indices for Asian Outflow and Transpacific Transport on Daily to Interannual Timescales.

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Long-range Transport of Asian Pollution to North America: Transport, chemistry and variability

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  1. Long-range Transport of Asian Pollution to North America: Transport, chemistry and variability Qing Liang and Lyatt Jaeglé University of Washington, Seattle

  2. Meteorological Indices for Asian Outflow and Transpacific Transport on Daily to Interannual Timescales • Model: GEOS-CHEM Tagged CO simulation • 10 year simulation (1992-2002), 2˚x2.5˚ • Use seasonal climatological biomass burning and same OH field for each year. • Method • Correlate tagged Asian CO tracer with Sea Level Pressure (SLP) to form simple transport indices Liang et al. [2005], submitted to J. Geophys. Res.

  3. Daily variability in Asian Outflow Asian Outflow Index: SLP anomalies over NE China SLP anti-correlated with export • Cyclones over NE China favors export Asian CO R (Asian CO, SLP) R = 0.38-0.47 1993

  4. Daily variability in transpacific transport Transpacific Transport index: SLP anomalies in E. Pacific SLP correlated with transport • Strong Pacific High favors transpacific transport Asian CO R (Asian CO, SLP) R = 0.27-0.53 1993

  5. Interannual variability of Transpacific Transport Winter & Spring Monthly Asian CO in the western North America is correlated with the meridional SLP gradient Index: Weighted SLP anomalies over the N. Pacific R = 0.65 Enhanced Transpacific Transport

  6. What drives the interannual variability of transpacific transport? • LRT3 strongly projects on Pacific and North American (PNA) index R(LRT3, PNA)=0.69 for 1948-2004 Enhanced Transpacific Transport

  7. Summertime influence of Asian pollution in the middle and upper troposphere during INTEX-A • INTEX-A: 18 flights, Jun. 29 – Aug. 14, 2004 • Goals and Methods • What was the extent of Asian influence over the U.S. during INTEX-A? • Use GEOS-CHEM to identify Asian plumes in observations, characterize their composition, and elucidate their chemical evolution and transport mechanisms Asian plumes sampled during INTEX-A (Modeled Asian CO > 25-30 ppbv) 6 Asian plumes GEOS-CHEM Model Observ. Asian CO

  8. Chemical Composition of Asian Plumes July 1, 2004 – Asian Plume Asian Plume Modeled Asian CO [ppbv] Enhancement in Asian Plumes vs. Background 1 3 2 DIAL+ In Situ O3 Observations [ppbv] 3 1 2

  9. Future work • Chemical properties and evolution of the Asian plumes • Origin of discrepancy between model and observations (transport, STE, chemistry?) • Impact on Ozone in UT over US • Was transpacific transport during INTEX-A unusual?

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