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Ocean and earth dynamics study by TOPEX/POSEIDON altimeter

通过 TOPEX/POSEIDON 高度计进行海洋和地球动力学研究

基本信息

批准号：
08044094
负责人：
IMAWAKI Shiro
金额：
$ 6.46万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044094/
关键词：
satellite altimetry TOPEX POSEIDON oceanic variability geoid gravity anomaly tide 動力異常

项目摘要

Micro-wave radar altimeters on board satellites can measure the sea surface hight globally with accuracy 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. The program sent the Principal Investigator and nine Co-Investigators to TOPEX/POSEIDON Science Working Team meetings held in England in 1996 and in France in 1997, in order to exchange information about international satellite altimetry studies. Scientific meetings were held in Tokyo in 1996 and 1997, in order to discuss about altimetry data processing and analyzes. For those meetings, four scientists of Australia, the United States and France were invited in order to stimulate international cooperation. Through those activities, following results have been obtained : (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) Features of surface circulations of the whole North Pacific were also revealed through combined use of altimetry data with in situ oceanographic data ; (3) The scheme has been developed to assimilate the altimetrly data to numerical models of the oceans ; (4) A precise global tide model was obtained from altimetry data ; (5) A high-resolution global map of gravity anomaly was obtained through the release of altimetry data during the GEOSAT Geodetic Mission, which has been unclassified recently ; and (6) A high-precision geoid map was obtained for the seas around Japan by combined use of altimetry data with in situ gravity anomaly data.

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非常有用。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。该方案派首席研究员和9名共同研究员参加1996年在英国和1997年在法国举行的TOPEX/POSEIDON科学工作组会议，以便交流有关国际卫星测高研究的信息。1996年和1997年在东京举行了科学会议，讨论测高数据的处理和分析。这些会议邀请了澳大利亚、美国和法国的四名科学家，以促进国际合作。通过这些工作，取得了以下成果：（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，揭示了整个北太平洋表层环流的特征;（3）发展了将测高资料同化到海洋数值模式中的方案：（4）利用测高资料建立了精确的全球潮汐模式;（5）通过GEOSAT大地测量使命期间发布的测高数据，获得了高分辨率的全球重力异常图，（6）结合测高数据和现场重力异常数据，获得了日本周边海域的高精度大地水准面图。