HR: 1340h
AN: A43B-0099    [Abstracts]
TI: A New Linearized Photochemistry Parameterization for Operational Ozone Assimilation in Numerical Weather Prediction Systems
AU: * McCormack, J P
EM: john.mccormack@nrl.navy.mil
AF: E.O. Hulburt Center for Space Research, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375 United States
AU: Allen, D R
EM: dallen@dordt.edu
AF: Department of Physics and Astronomy, Dordt College, 498 4th Ave NE, Sioux Center, IA 51250 United States
AU: Coy, L
EM: lawrence.coy@nrl.navy.mil
AF: E.O. Hulburt Center for Space Research, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375 United States
AU: Eckermann, S D
EM: stephen.eckermann@nrl.navy.mil
AF: E.O. Hulburt Center for Space Research, Naval Research Laboratory, 4555 Overlook Avenue SW, Washington, DC 20375 United States
AU: Stajner, I
EM: ivanka@gmao.gsfc.nasa.gov
AF: Global Modeling and Assimilation Office Code 610.1, NASA Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: The Ozone Mapping and Profiler Suite (OMPS) will deliver real-time ozone data for assimilation in numerical weather prediction (NWP) models. This information will benefit forecasts by improving the modeled stratospheric heating rates and providing better first-guess temperature profiles needed for infrared satellite radiance retrieval algorithms. Operational ozone data assimilation for NWP requires a fast, accurate treatment of stratospheric ozone photochemistry. We present results from the new NRL CHEM2D Ozone Photochemistry Parameterization (CHEM2D-OPP), which is based on output from the zonally averaged NRL-CHEM2D middle atmosphere photochemical-transport model. CHEM2D-OPP is a linearized parameterization of gas-phase stratospheric ozone photochemistry developed for NOGAPS-ALPHA, the Navy's prototype global high altitude NWP model. A recent study of NOGAPS-ALPHA ozone simulations found that a preliminary version of the CHEM2D-based photochemistry parameterization generally performed better than other current photochemistry schemes that are now widely used in operational NWP and data assimilation systems. A new, improved version of CHEM2D-OPP is now available. Here we report the first quantitative performance assessments of the updated CHEM2D-OPP package in the NRL Global Ozone Assimilation Testing System (GOATS). This study compares the mean differences between GOATS ozone analyses and SBUV/2 ozone measurements (both vertical profile and total column) during September 2002 using several different ozone photochemistry schemes. We find that CHEM2D-OPP generally delivers the best performance out of all the photochemistry schemes we tested. Future development plans for CHEM2D-OPP, such as interfacing it with a "cold tracer" parameterization for heterogeneous ozone-hole chemistry, will also be presented.
UR: http://uap-www.nrl.navy.mil/dynamics/html/nogaps/chem2dopp/chem2d_opp.html
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 1640 Remote sensing (1855)
DE: 3300 ATMOSPHERIC PROCESSES
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005