| Project/Area Number |
02452059
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
気象・海洋・陸水学
|
|---|
| Research Institution | KYOTO UNIVERSITY |
|---|
Principal Investigator |
IMASATO N. KYOTO UNIV., FAC. SCI., PROFESSOR, 理学部, 教授 (40025391)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
S.FUJIO UNIV. TOKYO, OCEAN RES. INST., RA., 海洋研究所, 助手 (00242173)
K.AKITOMO KYOTO UNIV., FAC. SCI., RA., 理学部, 助手 (10222530)
AWAJI T. KYOTO UNIV., FAC. SCI., AP., 理学部, 助教授 (40159512)
|
|---|
| Project Period (FY) |
1990 – 1992
|
| Project Status |
Completed (Fiscal Year 1992)
|
| Budget Amount *help |
¥5,900,000 (Direct Cost: ¥5,900,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1991: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥2,900,000 (Direct Cost: ¥2,900,000)
|
|---|
| Keywords | DIAGNOSTIC MODEL / VELOCITY FIELD IN THE GLOBAL OCEAN / LAGRANGIAN MOTION / WATER EXCHANGE / DISPERSION COEFFICIENTS / 全海洋物質循環 / 水塊形成過程 / オイラ-ラグランジュ法 / 粒子追跡 / 深層水の置換時間 / 各大洋間の海水交換 / 物質循環 / 全海洋 |
|---|
| Research Abstract |
1. Annual mean velocity field in the global ocean was diagnostically calculated by using the 2ﾟX2ﾟ grid data of water density (Levitus, 1982) and wind stress (Hellerman and Rosenstein, 1983). The three dimensional motions of a large number of labeled particles were calculated to clarify the water-mass movements in the global ocean. (1) The Indonesian through flow was found to affect on the transport of the Antarctic Circumpolar Current(ACC). (2) Water volumes exchanged between the basins were evaluated quantitatively by tracking the particles for 10 years. (3) Exchange process between the surface layer (0-500m) and the deep layer (2000m-bottom) was clarified. (4) Distributions of the three dimensional dispersion coefficients in the global ocean were evaluated by giving turbulent motions for each particle in a group of the particles and tracking them for one year.
2. Velocity fields for the four seasons were diagnostically calculated. Those in the tropical areas in the Indian and the Pacific Ocean and the Weddell Sea showed the large seasonal change. Seasonal change of the formation of deep water was clarified.
3. The velocity field was prognostically calculated to examine the difference from the diagnostically calculated velocity field. The difference was not so large except in the deep Atlantic Ocean.
4. To examine the effects of ACC on the Pacific. the Atlantic and the Indian Ocean. a numerical experiment was performed by using the regional model with the fine grids of 0.5ﾟX0.5ﾟ. Meridional heat transport is now examined.
|
