Marine Ecosystems Research Department - jamstec japan agency ...

Japan Marine Science and Technology Center
Frontier Research System for Global Change
lived greenhouse gasses (CO , CH , N O, etc.), shortlived
reactive gaseous species (O , CO, NOx, VOC,
SO , OH, HO , etc.) and aerosols.
As a part of chemical transport model development,
regional-scale model and higher resolution global
model using the TRACE-P aircraft campaign data have
been successfully verified, which opened the way to
further development of process study. Also, a parallel
version of higher resolution atmospheric transport
model for analysis of sources and sinks of greenhouse
gases has been developed, enabling the use of the Earth
Simulator for future studies.
OH and HO radical field in North and Southeast
Asia has been obtained for the first time by using a
regional chemical transport model. Methane emission
from rice fields in mainland China has been estimated
by using the regional specific emission factors based
on thoroughly compiled datasets. The obtained value
. Tg yr - is substantially lower than the previously
reported values. This lower value is recommended to
be used in future studies.
a. Global Chemical Transport Modeling Group
Using the FRSGC/UCI CTM in conjunction with aircraft
observations from the NASA TRACE-P campaign,
it has been demonstrated that current global
chemical transport models run at high resolution can
successfully reproduce the regional distribution of
ozone over the western Pacific in springtime, including
the high variability induced by the passage of frontal
systems, photochemical production, and intrusion of air
from the stratosphere. In addition, it has been shown
that the chemical production of ozone can be simulated
well compared with observations, and hence that this
type of model is capable of addressing the global implications
for air quality and climate of regional emissions
of ozone precursors with high reliability. Fig. compares
the net production rate of ozone along the flight
tracks of the DC- and P-B aircraft over the western
Pacific during the TRACE-P campaign. The model
reproduced the observed zonal mean vertical profile of
net ozone production successfully.
We participated in the NASDA PEACE-A/B with a
global chemical transport model, CHASER, based on
CCSR/NIES AGCM. The chemical weather forecast
by the model well captured the transport of air pollutant
accompanying with a cold front.
The reaction scheme of SEAMAC is updated to
incorporate an explicit description of the degradation
of up to C hydrocarbons including ethene, propene,
and acetylene. Model calculations evaluated the effect
of these compounds on halogen chemistry in the
marine boundary layer.
b. Regional Chemical Transport Modeling Group
The CMAQ/RAMS model was applied to study the
temporal and spatial distributions of OH and HO in
the springtime of in East Asia when the NASA
12
11
10
9
8
7
6
5
4
3
2
1
0
Altitude /km
Net Ozone Production (FRSGC CTM)
2
-2
4
2
-8
2
10N 15N 20N 25N 30N 35N 40N 45N
12
11
10
9
8
7
6
5
4
3
2
1
0
Altitude /km
Net Ozone Production (Observations)
2
4 0 4
-2
2-2
4
2
16
8 32
10N 15N 20N 25N 30N 35N 40N 45N
-32 -16 -8 -4 -2 0 2 4 8 16 32
1e5 mol / cm 3 / s
Fig.11 Net production rate of ozone along the flight tracks of the DC-8 and P-3B aircraft
over the western Pacific during the TRACE-P campaign, showing boundary layer
production over Northeast Asia, destruction over marine regions, and slow production
in the upper troposphere.
129