Marine Ecosystems Research Department - jamstec japan agency ...

Japan Marine Science and Technology Center
Frontier Research System for Global Change
face chlorophyll distribution, in that the concentrations
are high in the areas with Ekman upwelling such as the
northern North Atlantic, northern North Pacific, equatorial
regions, and the Southern Ocean (Figure ). The
model also captures the distinct blooming event in the
northern North Atlantic due to the sudden shallowing
of the mixed layer depth in spring. Incorporation of the
carbonate system into the model is also completed.
Model integration of a few thousand model years,
required for achieving the stationary state, is going to
be conducted. The model has a relatively fine resolution
for a model for a global scale, and it is estimated
that approximately months are needed even using the
Earth Simulator to carry out such a long integration,
which means that the integration is virtually impossible
with other existing supercomputers.
a-. Dynamical Global Vegetation Model
The objective of this group is to establish a plantdynamics-model,
which will be incorporated into the
integrated-terrestrial-model in subject of the MEXT's
project. This plant-dynamics-model is specifically
designed for predicting vegetation changes at high latitudes
in the Northern Hemisphere, where potentially
large, rapid climate changes occur. Although most of the
present Dynamic Global Vegetation Models (DGVMs)
assume that vegetation dynamics were regulated by gap
mechanism, vegetation dynamics at high latitude would
be primarily regulated by climate and disturbance
regimes rather than gap mechanism. Accordingly, as a
base of the vegetation-dynamics-model, we employ
ALFRESCO that simulates vegetation change from arctic
tundra to boreal forest in response to global changes
in climate, fire, and land use. Although, ALFRESCO
predicts landscape-level response of vegetation, it does
not predict changes in plant biomass or forest size-structure,
which will be required for the integrated-terrestrialmodel.
Thus, we extend ALFRESCO to incorporate
plant growth models for predicting both of the changes
in plant biomass and forest size-structure. For finer simulation
of vegetation change, we are also looking to
incorporate () seed dispersal process, and () highly
heterogeneous landscapes in boreal and arctic areas.
b. Development of a Coupled Atmospheric Composition
– Climate Change Model
b-. Model for Global warming – Atmospheric
Composition Change Interaction
Feb. Apr.
May. Jul.
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Nov. Jan.
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Fig.31 Seasonal variation of surface chlorophyll in the model. Units are mg/m 3 .
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