Marine Ecosystems Research Department - jamstec japan agency ...

Japan Marine Science and Technology Center
Frontier Research System for Global Change
d-. Development of Assimilation Scheme Using
Statistical Method
The analysis scheme for the Ensemble Kalman
Filter has been implemented using MPI fortran on
the Compaq Alpha SC. The system has been tested
on the Compaq Alpha SC with an ensemble size of
members, assimilating a range of real data. The
analysis code has been successfully tested on the Earth
Simulator.
A further issue under investigation is the use of a
range of parameter values across the ensemble members.
This is intended to address the question of model
error, since using (incorrectly specified) fixed parameter
values contributes to structural model error. Some
preliminary experiments have been undertaken in collaboration
with the Paleoclimate Group of the Global
Warming Research Program using a low-resolution climate
model in identical twin tests.
7. International Pacific Research Center (IPRC)
Since FRSGC's IPRC Program is fully integrated
into the research at the IPRC, the IPRC research efforts
and results for FY are briefly summarized below.
For more detailed information visit the IPRC website,
http://iprc.soest.hawaii.edu, which posts the IPRC
annual reports and issues of the IPRC Climate, IPRC's
semiannual newsletter.
Science Plan
The work of the IPRC scientists is guided by the
IPRC Science Plan, which is reviewed annually and
updated to reflect developments. The newest version,
Version ., is posted on the IPRC website. The plan
consists of the following four scientific themes:
Theme : Indo-Pacific Ocean Climate
Theme : Regional Ocean Influences
Theme : Asian-Australian Monsoon System
Theme : Impacts of Global Environmental Change
Each theme has a Goal, which broadly outlines the
theme's subject matter and specific Objectives, which
are achievable within a finite amount of time and with
well-defined resources. It is expected that these four
themes will endure throughout the IPRC lifetime, but
additional themes may be added at some future time.
The objectives, on the other hand will change with
research developments.
The IPRC research strategy is to carry out diagnostic
analyses and modeling studies of the atmosphere,
ocean, and coupled ocean-atmosphere-land system,
rather than to conduct experimental programs.
Research on FY
a. Theme : Indo-Pacific Ocean Climate
Regarding Pacific Ocean circulation and climate,
research included modeling studies of the Kuroshio
Extension, the California Current, and the low-latitude
western boundary currents, as well as studies of inertial
instability of the equatorial undercurrent. Regional
atmospheric models, including the IPRC Regional
Climate Model, were applied to the study of the
Kuroshio, the East China Sea, and eastern tropical
Pacific climate–particularly the effects of the Andes.
Atmospheric and coupled GCMs were used to study the
effect of continental asymmetry on the northward-displaced
ITCZ and the influence of SST anomalies on
extratropical storm tracks. Regarding the Indian Ocean,
studies were conducted on the relationship between the
Indian Ocean Dipole and the El Niño-Southern
Oscillation; the remote climate effects of Indian Dipole
events; the effects of the monsoons, El Niño, La Niña,
and the Indian Ocean Dipole on Indian Ocean circulation
by using salinity tracers in a .-layer ocean
model; and the relative strength of the fall and spring
Wyrtki Jets by analyzing data products and comparing
them with ship-drift data.
Application of satellite observations to climate
research has emerged as a new strength of Theme-
research and has led to the discovery of SST effects on
local winds: From the equator to mid-latitudes, results
show a robust and ubiquitous pattern of ocean-toatmosphere
feedback, namely, surface wind speeds
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