1996 Fiscal Year Final Research Report Summary
Development of Data Assimilation Methods for Mesoscale Processes and General Circulation in the Ocean
| Project/Area Number |
07044050
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Hokkaido University |
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Principal Investigator |
IKEDA Motoyoshi Graduate School of Environmental Earth Science, Hokkaido University, Professor, 大学院・地球環境科学研究科, 教授 (50261227)
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| Co-Investigator(Kenkyū-buntansha) |
キュー ハワイ大学, 助教授
ベル 連合王国気象局, 研究員
ギル カリフォルニア大学, 教授
FUKUMORI Ichiro Jet Propulsion Laboratory, NASA, 研究員
シュローター アルフレッド, ウェグナ研究所, 研究員
エヴェンセン ナンセン, センター, 研究員
ウー 中国海洋局, 主任研究員
ネシャエフ シャーショフ海洋研究所, 研究員
ヤレムチャック シャーショフ海洋研究所, 研究員
SHIMA Shigeki Mutsu Institute of Oceanography, Japan Marine Science Foundation, むつ海洋研究所, 主任研究員
WAKATA Yoshinobu Graduate School of Science, University of Tokyo, 大学院・理学系研究科, 助教授 (90201871)
KUBOTA Masahisa Faculty of Oceanography, Tokai University, 海洋学部, 教授 (90147124)
KAMACHI Masafumi Meteorological Research Institute, Japan Meteorological Agency, 主任研究官
YAMAGATA Toshio Graduate School of Science, University of Tokyo, 大学院・理学系研究科, 教授 (50091400)
SHROETER Jens Alfred Wegner Institute of Polar Research
EVENSEN Geir Nansen Remote Sensing and Environment Center
WU Huiding State Oceanographic Administration
NECHAEV Dmitry Shirshov Institute of Oceanography
YAREMCHUK Max Shirshov Institute of Oceanography
QIU Bo University of Hawaii
BELL Michaei British Meteorological Office
GHIL Michael University of California
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| Project Period (FY) |
1995 – 1996
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| Keywords | physical oceanography / data assimilation / satellite remote sensing / variational method / adjoint equation method / Kalman filter method |
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| Research Abstract |
1995-96
Since data assimilation is a new approach for revealing oceanographic processes, it was extremely useful for the principal investigator (PI) and the co-investigators (CI) to exchange the information that they had among them. Hence, we held a meeting in Tsukuba in July, in which the other researchers were also invited and worked together to review the existing methods and search data sets.
The PI visited Canada and did Research on the adjoint equation method taht Russian CI (living in Canada) developed. They visited Japan for one and half months to participate in the PI's projects. They visited many research institutes in Japan and exchanged their knowledge with Japanese scientists. The PI and Russian CI submitted a paper to Journal of Oceanography. One CI (Kamachi) visited Norway to investigate the Kalman filter method. This trip was highly necessary, because there was no specialist in Japan in this field.
1996-97
Following the first meeting in the first year, we held the second, m
… More
ore international meeting in Mutsu by inviting five CI from various countries. The total number of the participants wa more than 40. The participants exchanged the information on the more advanced methods of data assimilation than the first year. Some suggestions include (1) in the adjoint method, a dynamical model with a simpler physics may be more suitable as a constraint model, and (2) in the Kalman filter method, it is necessary to remove instability when a strongly nonlinear system is dealt with.
The PI visited University of Hawaii to exchange information on data assimilation for general circulation in the North Pacific.
Outcomes from this projects are
(1) it is possible to reconstruct subsurface field from satellite altimeter data using the adjoint method,
(2) it is possible to reconstruct shelf circulation from surface velocity data,
(3) it is useful to include both altimeter data and drifter data to reconstruct large scale circulation,
(4) it is possible to reconstruct the oceanic field beneath the surface mixed layr by assimilating surface data.
The objectives initially listed in the proposal have been achieved. The information exchange was extremely useful for the PI and CI to develop their research at the initial stage. Less
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Research Products
(2 results)
