1. Transpacific Transport of Ozone Pollution During INTEX-B Lin Zhang, Daniel J. Jacob, INTEX-B Science Team, TES Science Team GEOS-Chem User Meeting Harvard University Apr 13 2007

2. GEOS-Chem simulation  V7-04-09 with GEOS-4, 2º x 2.5º  Lightning 6 Tg N/yr, regional rescaled with OTD/LIS climatology (Lee Murray)  2004 NOx emission for China (Q. Zhang et al. 2007) (Yuxuan Wang, 65% higher than 2000)  Streets et al [2006] CO emission for China increased by 57% (number from B. Pierce/D. Streets at the INTEX-B workshop) INTEX-B flight tracks INTEX-B pacific part (Apr 17-May 15, 2006)  Characterize ozone production in transpacific plumes.  Measurements from M. A. Avery, W. H. Brune, T. Campos, C. A. Cantrell, R. C. Cohen, F. M. Flocke, B. Heikes, G. Huey, L. Mauldin, G. W. Sachse, H. B. Singh, A. J. Weinheimer, and P. O. Wennberg

3. MOPITT observed CO column trend over China Eastern China (20N-50N, 100E-130E) 1.6% relative to 2000

4. DC8 C130 CO NO x PAN Ozone Comparisons of mean vertical profiles of CO, NO 2, PAN and ozone

5. Ozone production in transpacific plumes  Direct ozone transport and ozone produced during transport  Transpacific plumes often split into two branches. Ozone production takes place in the south branch. L H

6. The mean Asian ozone, CO, NOx, and PAN enhancements over the North Pacific at 800 hPa during the INTEX-B period Latitudinal distribution of NO 2 and PAN below 4 km Conversion from PAN to NO x in the subtropics Ozone CO NO x PAN NO 2 PAN

7. Altitude-longitude section of the Asian ozone enhancement at 30-40N NA for the INTEX-B period mean for the May 5-11 plume NA

8. A B Aircraft measured transpacific plume on May 9th A B A-south branch GEOS-Chem Tropospheric CO Column on May 9 Simulated net ozone production at 680 hPa on May 9 Solid: observations Dot: GEOS-Chem B-north branch PAN HNO 3 NO O3O3 CO O3O3

9. May 5 May 6 May 7 May 8 May 9 TES observations of the transpacific plume TESGEOS-Chem Tropospheric CO column GEOS-Chem with TES AK

10. TES observed transpacific transport of ozone pollution TES GEOS-Chem simulated Asian ozone enhancement Ozone concentration at 500 hPa GEOS-Chem with TES AK May 5-6 May 7-8 May 9-10

11. Measurements by Dan Jaffe at Mt. Bachelor (2.7 km) Bias = -14 ppbv R = 0.34 Bias = -1ppbv R = 0.74 observed CO (139 ± 14) model CO (125 ± 12) model Asian CO enhancement (47 ± 7) observed ozone (54 ± 10) model ozone (53 ± 8) Asian Ozone enhancement (10 ± 2 ) Ozone produced in Asian BL (4 ± 1.4)

12. Back-ups

13. Model Ozone at Surface for the INTEX-B period

14. MOPITT and AIRS observations of the Asian plume MOPITT (AM)AIRS Total CO column May 5 May 6 May 7 May 8 May 9