1 / 9

Modeling Support for Harvard University Summer 2004 Field Studies on North American Outflow Mechanisms

This paper discusses the findings and recommendations from Harvard University's summer 2004 field studies on North American outflow mechanisms and the chemical and aerosol characteristics of the outflow. The study utilizes hindcast simulations and satellite data to investigate the pathways and make recommendations for future flight patterns. The paper also covers inverse model analyses of ozone and aerosol precursors, as well as the integration of aircraft, satellites, and models.

hallc
Download Presentation

Modeling Support for Harvard University Summer 2004 Field Studies on North American Outflow Mechanisms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SUMMER 2004 FIELD STUDIESModeling support by Harvard University A. MISSION PLANNING • GEOS-CHEM hindcast simulations for 1997, 2000, 2001 • Investigate main N American outflow mechanisms and pathways • Examine chemical and aerosol characteristics of the outflow • Make recommendations for ITCT/2K4 and INTEX flight patterns Paper to be completed in fall 2003 (Qinbin Li and Rynda Hudman)

  2. B. MISSION EXECUTION • GEOS-CHEM chemical forecasts (Duncan Fairlie, Rynda Hudman, Bob Yantosca): • GEOS-4 met. forecasts from NASA/GMAO (1ox1o horiz. res.) • 6 tracers: North American FF CO and BB CO, rest of world FF CO and BB CO, soot (water-soluble), stratospheric ozone • continuous presence of Harvard team in the field • Near-real-time satellite data from GOME, SCIAMACHY (Kelly Chance, Randall Martin) • CO, NO2, HCHO column imagery • Also possibly early data from Aura (TES) • Design of satellite validation flights

  3. C. POST-MISSION ANALYSES Central theme: inverse model analyses of North American sources of ozone precursors, aerosol precursors, and long-lived GGs A PRIORIKNOWLEDGE Bottom-up inventories Chemical/aerosol processing TOP-DOWN CONSTRAINTS FORWARD MODEL satellite GEOS-CHEM CTM Ozone-aerosols-GG coupled simulation validation in situ (aircraft and other) INVERSE MODEL ANALYSIS IMPROVED KNOWLEDGE

  4. INTEGRATION OF AIRCRAFT, SATELLITES, MODELS, AND a priori EMISSION INVENTORIES IN TRACE-P • Chinese anthrop ECO 50% too low • biomass burning ECO 70% too high CO aircraft observations (G.W. Sachse) MOPITT CO observations Inversion (P. Palmer) Top-down constraints CTMs validation Chemical forecasts Daily CO biomass burning emissions from AVHRR (C.L. Heald) CO fossil and biofuel bottom-up emission inventory (D.R. Streets, ANL)

  5. MOPITT VALIDATION PROFILES DURING TRACE-P Aircraft w/ av. kernels Aircraft MOPITT (v3, Dx = ±100 km) Averaging kernels

  6. TRACE-P VALIDATION PROFILES:MOPITT vs. DC-8 CO columns DC-8 w/avKer r2 > 0.99 DC-8 950-300 hPa r2 =0.98

  7. MEAN CO COLUMNSDURING TRACE-P (Mar-Apr 2001) MOPITT GEOS-CHEM w/ adjusted anthrop source, original biomass burning source Top-down constraints from MOPITT on Asian CO sources are consistent with aircraft observations Difference Heald et al. [2003]

  8. NOy export efficiency out of the North American boundary layer: NOy-CO correlations along the NARE’97 flight tracks Export efficiency of NOy (mixing model of Parrish et al. ). Li et al. [2003]

  9. Ozone production from exported North American anthropogenic NOy GEOS-CHEM, September 1997 • Half the ozone production from exported anthopogenic NOy takes place in the very near-field from exported NOx; the other half is driven by PAN decomposition and is dispersed over the NH • This eventual ozone production due to exported NOy is comparable to direct export of ozone pollution in terms of contribution to the global tropospheric ozone reservoir. Li et al. [2003]

More Related