Marine Ecosystems Research Department - jamstec japan agency ...

JAMSTEC 2002 Annual Report
Frontier Research System for Global Change
TRACE-P campaign was conducted. For evaluating
the model performance, modeled concentrations of OH
and HO were compared with observational data
obtained onboard the DC- and P-B during the campaign.
Comparison shows that simulated OH and HO
concentrations agree reasonably well with observations,
while calculated values are generally higher than
the observed values. Fig. shows calculated regional
distribution of OH and HO radicals in East Asia in the
daytime on March , .
The Air Quality Prediction Modeling System
(AQPMS) is used to perform year-long, quantitative
simulation of rainwater pH in East Asia. Monitoring
data of EANET (the Acid Deposition Monitoring
Network in East Asia) in addition to the field observation
data of SEPA (State Environmental Protection
Administration) of China are used to evaluate the
model, and a reasonable agreement is obtained.
c. Greenhouse Gases Modeling Group
Using inverse model techniques, we select most
effective procedures for future atmospheric CO observations.
An assessment of the utility of CO vertical
profile measurements by a solar occultation based
satellite sensor is made. We have compared the
impacts of these possible vertical profile observations
and optimal extensions of the present surface measurement
network on the estimation of CO regional
sources from annual average CO concentration patterns
by an inverse model. The satellite measurements
are valuable to constrain the CO source uncertainties
for the tropical lands with no existing observations.
The optimal extension of the surface network appears
to be the more effective way to reduce average inverse
model uncertainty; however, in high resolution inversion
the relative merit of the satellite data is higher
than that in the low-resolution case. We show that the
systematic errors in satellite observations can lead to
significant shifts in the inverse model-estimated fluxes.
Parallel version of the atmospheric transport model
has been developed for high-resolution, long-term,
multiple tracer simulations necessary for forward and
inverse model analysis. CO fluxes, simulated with
ecosystem model Biome-BGC, were prepared. We also
continue developing and improving data analysis software,
incorporating data fitting and filtering, editing
and visualization. The analysis system was applied to
shipboard measurement data of atmospheric N O over
the Pacific Ocean.
d. Atmospheric Composition Data Analysis Group
Carbon monoxide total column amount is regularly
measured over Hokkaido since and over Russia
since . A comparison of these total columns
reveals a systematic CO surplus over Hokkaido in
summer months. Calculations based on isentropic trajectories
and inventories of CO sources show that forest
fires and combustion processes in populated areas
contribute to this surplus (Fig.).
The surface O and CO data from continuous meas-
Fig.12 Simulated regional distribution of a) OH and b) HO 2 radicals in East Asia at 13Z
on March 7, 2001 during TRACE-P campaign period.
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