Study of Ocean and Earth Dynamics Using Satellite Altimeters

利用卫星高度计研究海洋和地球动力学

• 批准号: 10044088
• 负责人: IMAWAKI Shiro
• 金额: $ 5.38万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044088/
• 关键词: satellite altimetry; TOPEX; POSEIDON; oceanic variability; geoid; gravity anomaly; tide

Micro-wave radar altimeters on board satellites can measure the sea surface height globally with a ccuracy of a few centimeters, and are considered to be very useful for studies of dynamics both of the oceans and solid earth. In the present study, cooperative works between physical oceanographers and solid earth geophysicists have been intended. This program sent the Principal Investigator and several Co-Investigators to the joint TOPEX/POSEIDON and Jason-1 Science Working Team meetings held in the United States in 1998 and in France in 1999, in order to exchange information about international satellite altimetry studies. Scientific meetings were held in Fukuoka in 1998 and in Tokyo in 1999, in order to discuss about altimetry data processing and analyses. For those meetings, scientists from the Great Britain and Australia were invited in order to stimulate international cooperation. Through those activities, following progresses have been made : (1) A long time series of transport of the Kuroshio south of Japan was obtained by combined use of satellite altimetry data with in situ oceanographic data ; (2) Flow field and transport of the Oyashio and also features of surface circulations of the whole North Pacific were revealed through combined use of altimetry data with in situ oceanographic data ; (3) The scheme has been developed to assimilate the altimetry data to numerical models of the oceans, in order to obtain dynamically-consistent data sets ; (4) A precise global tide model for diurnal and semidiurnal tides was obtained from altimetry data, and also studies on long-period tides and tidal dissipation due to friction were started ; (5) Estimating the accuracy of local gravity field was mulated and also relationship between ocean variability and earth gravity variability was studied.

卫星上的微波雷达高度计可以测量全球范围内的海面高度，精度可达几厘米，对海洋动力学和固体地球动力学的研究都是非常有用的。在本研究中，物理海洋学家和固体地球物理学家之间的合作工作一直是打算的。该方案派主要研究员和几名共同研究员参加了1998年在美国和1999年在法国举行的TOPEX/POSEIDON和Jason-1科学工作组联合会议，以便交流有关国际卫星测高研究的信息。1998年在福冈和1999年在东京举行了科学会议，讨论测高数据的处理和分析问题。这些会议邀请了英国和澳大利亚的科学家，以促进国际合作。通过这些工作，取得了以下进展：（1）利用卫星测高资料和海洋实况资料，获得了日本以南黑潮输送的长时间序列：（2）利用卫星测高资料和海洋实况资料，揭示了北太平洋洋面环流特征和洋面流场、黑潮输送;（3）发展了将测高资料同化到海洋数值模式中的方案，以获得动力学一致的资料集：（4）利用测高资料获得了精确的全日潮和半日潮全球潮汐模式，并开始了长周期潮汐和摩擦耗散的研究;（5）模拟了局部重力场的估计精度，并研究了海洋变化与地球重力变化的关系。

项目成果

Imawaki,S.: "Observationally estimated transport of the Kuroshio south of Japan"Proc,International Symposium TRIANGLE '98. 65-73 (1998)

Imawaki,S.：“日本南部黑潮输送的观测估计”Proc，国际三角研讨会 98。

Uchida,H,: "On Kuroshio Surface veloctities derived from satellite altimeter and drifter data"Proc,Symposium Ocean-Earth Dynamics and Satellite Altimetry. 23-32 (1998)

Uchida，H：“关于从卫星高度计和漂流器数据导出的黑潮表面速度”Proc，海洋-地球动力学和卫星高度测量研讨会。

Tabahashi, S.: "Improve estimates of wide-ranging sea surface temperature from GMS S-VISSR data"J. Oceanography. (in press). (2000)

Tabahashi, S.：“根据 GMS S-VISSR 数据改进对大范围海面温度的估计”J。

Doi, K.: "Premilinary study to generate a DEM of Amundsen Bay, antarctica by Interferometric SAR"Polar Geosci.. 11. 14-22 (1998)

Doi, K.：“通过干涉 SAR 生成南极洲阿蒙森湾 DEM 的初步研究”Polar Geosci.. 11. 14-22 (1998)

Ebuchi, N.: "Growth of wind waves with fetch in the Sea of Japan under winter monsoon"Proc. PORSEC. '98. 378-382 (1998)

Ebuchi, N.：“冬季季风下日本海风浪的增长与回升”Proc。