Marine Ecosystems Research Department - jamstec japan agency ...

Japan Marine Science and Technology Center
Frontier Research System for Global Change
with energy and enstrophy
conservation scheme
without energy and enstrophy
conservation scheme
Fig.21 Free surface height field of the Rossby-Haurwitz test case (Case 6 of Williamson's test suit)
wave (test case of Williamson's test suit). The resolutions
of both calculation were about deg. The height
field of the model with energy and enstrophy conserving
scheme was much smoother than that of the other
model. In addition, no apparent noise was generated
from the singularity, which is shown as the threeforked
line points on the figures.
c. Development of an Integrated Earth System Model
for Global Warming Prediction
Climate change, such as global warming, is an outcome
of complex interactions among climate, terrestrial
and oceanic ecosystems, and chemical composition
of the atmosphere. The purpose of this project is to
develop an integrated earth system model that can simulate
these interactions, and provide reliable predictions
for change of the global environment.
In current studies of climate change due to an
increase of greenhouse gases, specifically CO , the
atmospheric CO concentration is first calculated using
CO emission scenarios and simple models of terrestrial
and oceanic carbon budgets. The calculated atmospheric
CO concentration is then substituted into a climate
model, and predictions of the future climate are
made. However, this approach does not consider any
feedbacks between climate and carbon cycle; while
increase of atmospheric CO concentration would
cause global warming, global warming could in turn
affect the process of CO release and uptake by terrestrial
and oceanic ecosystems and by the sea water.
Moreover, climate change could also affect concentration
of tropospheric ozone, which is another greenhouse
effect gas. Therefore, for providing reliable predictions
of global warming and climate change, it is
strongly required to develop an integrated earth system
model combining climate, carbon cycle, and chemical
composition of the atmosphere and to use it for global
warming prediction.
This is a project originally planned as the third target
of the model development at the Integrated Model
Development Program. The project team was organized
by participation of members from many other programs
of FRSGC. The project started from FY as
Subject of the MEXT project for Sustainable Coexistence
of Human, Nature and the Earth. For details,
refer the report of this project.
d. Data Assimilation Group
d-. Improved Estimates of Dynamical State of the
North Pacific
We have validated our global ocean dataset derived
from our D-VAR data assimilation experiment for climatological
seasonal state by comparison with recent
observational/reanalysis datasets.
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