Regional Chemistry from Global CTMs with
EC-Modeled Met-fields for the TRACE-P Mission

UC Irvine: M. J. Prather, PI, C. McLinden, B. Pak (mprather@uci.edu);
FRSGC Japan: J. Oliver Wild, co-I (oliver@frontier.esto.or.jp);
U. Oslo: J. Sundet and I. Isaksen, co-I's (j.k.sundet@geofysikk.uio.no)

Proposed Research & Scientific Goals

The IJO (Irvine-Japan-Oslo) group will enhance their existing 3-D global chemistry-transport
models (CTM) to build a higher-resolution CTM (based on EC forecast fields)
to focus on the TRACE-P region and time frame. The goal would be to understand how
different source regions and emission types in Asia are responsible for primary and
secondary pollutants over the Pacific as measured in TRACE-P. Specifically, the IJO
group will:

(1) provide a preliminary 3-D chemical climatology for the TRACE-P period and region
based on a previous year (199x) meteorology for the purposes of mission planning.
(when needed? when available?);

(2) provide general field-support for chemical modeling based out of FRSGC (Frontier
Research System for Global Change), Tokyo, but no real-time forecasts;

(3) post-mission, develop CTM met-fields based on EC forecasts for the TRACE-P
period and apply them in the IJO chemical model;

(4) determine the contributions to global tropospheric oxidant capacity (O3 and OH)
from different source regions and emissions types in the Asian outflow; and

(5) use TRACE-P observations with CTM sensitivity studies to understand how different
source regions and emission types in Asia are responsible for primary and
secondary pollutants over the Pacific.

Direct Field Involvement

Participation in deployment is desirable, but not absolutely required. It would focus
through FRSGC Japan. The IJO group will be able to provide some quick turn-around
for low-resolution CTM simulations in response to questions raised in the field

Basic Tools

The modeling will be derived from two established CTMs developed at UCI/FRSGC and
U.Oslo. The met fields will be taken from EC forecasts at T63 (1.9 o x 1.9 o ), 19 levels,
with 3-hourly averages. The CTM will use the same resolution, but can also run with
reduced resolution (T42, T21) for fast turnaround.
Existing diagnostics allow detailed chemical budget calculations, including net
production-loss over any spatial and temporal scales.
The global CTM with accurate stratospheric ozone fluxes allows identification of
stratospheric and long-range sources during TRACE-P.