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Science Lecture by Brad Pierce |
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Date: February 16, 2005
Time: 2:00pm
Location: NIA, Rm 404
Speaker: R. Bradley Pierce, NASA Langley Research Center
Subject: "RAQMS Chemical & Aerosol Studies During the 2004 NASA INTEX-NA Field Campaign"
Additional Information: Presentation (PDF) Webcast
The NASA LaRC/UW-Madison Regional Air Quality Modeling System (RAQMS) is a multi-scale meteorological and chemical modeling system for assimilating satellite observations of atmospheric composition and predicting atmospheric trace gas distributions [Pierce et al., 2003]. RAQMS combines two University of Wisconsin meteorological forecast models, the global UW-Hybrid Model (RAQMSG) and the nested UW-Non Hydrostatic Modeling System (RAQMSN) with an on-line unified stratosphere/troposphere chemical prediction scheme that was developed at LaRC. Ozone measurements obtained from near-real-time solar occultation (HALOE, SAGE III) and nadir viewing (EP-TOMS) instruments are assimilated within RAQMSG, which provides chemical boundary conditions for RAQMSN.
During summer 2004 RAQMSG provided daily meteorological and chemical composition forecasts, initialized with GFS analysis and constrained with assimilated satellite ozone measurements, for flight planning during INTEX-NA1. This talk presents preliminary evaluation of these forecasts based on comparisons with insitu surface measurements from the EPA AIRNow network, ozone-sonde data, and aircraft measurements collected during INTEX-NA. Results from RAQMS studies designed to evaluate the impact of long-range transport on regional air quality predictions will also be discussed.
1 The 2004 Intercontinental Chemical Transport Experiment - North America (INTEX-NA) is a NASA mission designed to quantify North American pollution and its impact on global air quality and climate. INTEX-NA is part of the International Consortium on Atmospheric Transport and Transformation
(ICARTT) which was formed to take advantage of concurrent NASA (INTEX-NA), NOAA (NEAQS-ITCT) and EU (ITOP) missions by planning and executing a series of coordinated experiments to study the emissions of aerosol and ozone precursors and their chemical transformations and removal during transport to and over the North Atlantic.
Pierce et al., Regional Air Quality Modeling System (RAQMS) predictions of the tropospheric ozone budget over east Asia, J. Geophys. Res., 108, D21, 8825, doi: 10.1029/2002JD003176, 2003.
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