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Atmospheric Composition

Previous NASA MAP work with GMI on CTMs will be continued with the development and testing of critical components in climate system modeling of atmospheric chemistry and composition. There is renewed emphasis on merging models, measurements, and error analysis. Beyond current GMI-deliverables, we will develop, test and quantify the errors for MAP components needed for GMI and GEOS climate modeling: (i) an optimized fast-JX based photolysis and solar heating code, (ii) a precipitation scavenging model focusing on NOy, (iii) delivery of independent, multi-year met fields (EC/Oslo) necessary for evaluation of errors in simulating campaign or satellite observations, (iv) an optional tracer-advection code for GMI, (v) simplified stratospheric chemistry module (O3 & NOy) for long-term climate runs, and (vi) application of a resolution error analysis / correction scheme (being developed under NSF funding). Much of this development will rely on use of atmospheric observations to quantify and reduce model error: model & measurement tests of our CTM ozone fields (funded under the NASA-Aura science team) will be extended to GMI/GEOS modules and met fields; evaluation of the precipitation scavenging of HNO3 will be based on free-troposphere observations to calibrate the impact of scavenging on tropospheric NOx and O3 levels. A small effort is also proposed (vii) to participate in international community projects (SPARC CCMVal, IGAC AC&C;, EU QUANTIFY) so that new findings, e.g., from the QUANTIFY multi-model assessment of the climate impacts of the transport sector, are incorporated into the NASA MAP effort. The research is guided by overall science questions: What is the right answer? How can we quantify errors in chemistry-climate modeling? When do improved algorithms pay off, e.g., alter the scientific conclusions? Which components of our chemistry and climate models lead to the greatest uncertainty in simulations of future composition and climate forcing?

Project PI: Michael Prather/University of California, Irvine

University of California, Irvine 3329 Croul Hall Mail Code: 3100 Irvine, CA 92697

Phone: (949) 824-5838

Fax: (949) 824-3256

Email: mprather@uci.edu

http://www.faculty.uci.edu/profile.cfm?faculty_id=2039

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Started: Aug 10, 2010

Last Activity: Dec 15, 2010

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