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Study on actual behavior of mesoscale eddies in oceanic turbulence with satellite-image analysis and numerical simulation

利用卫星图像分析和数值模拟研究海洋湍流中中尺度涡流的实际行为

基本信息

批准号：
15560446
负责人：
NISHIMURA Tsukasa
金额：
$ 2.3万
依托单位：
Tokyo University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Ocean currents such as the Kuroshio and Oyashio, which strongly influence on the flow fields around Japan-Island-Chain, are characterized by the mesoscale eddies with the representative horizontal length scale of a few hundreds kilometers. Although the behaviors of the mesoscale eddies are closely related with the coastal environments, there are a number of unknown factors for the dynamical evolution of the mesoscale eddies. On the other hand, the head investigator in this project has been monitoring the large-scale patterns of the water temperature and velocity vectors on sea surfaces with the image processing for the polar orbiting meteorological satellite NOAA, and then attempted to examine ocean current structures and the actual motion of mesoscale eddies around Japan-Island-Chain. For further evolutions of the above study, in the present project, we investigate the actual behavior of mesoscale eddies in the flow fields around Japan-Island-Chain. Furthermore we try to develop the n … More umerical method of ocean current including the mesoscale eddies. The main results of the project are expressed in the followings.(1)Measurements for oceanic turbulence with the satellite-image analysisWe have conducted flow visualizations and sea-surface velocity measurements with NOAA/AVHRR thermal infrared data. Every day the monitoring of the oceanic turbulence has been continuously performed by capturing the satellite data. Combing the above satellite-based data and other published data concerning the oceanic turbulence, we have constructed the database for the oceanic turbulence around Japan-Island-Chain.(2)Ocean current simulations with a new nesting approachTo effectively incorporate the above measured ocean-current data on ocean current simulations, a new nesting procedure for ocean current model was developed and then applied to the ocean current simulation. Through the comparison of the computed and observed results, we have confirmed the fundamental validity of the present method. Less

对日本岛链周围流场有重要影响的黑潮、亲潮等海流，其特征是具有数百公里水平尺度的中尺度涡旋。虽然中尺度涡旋的行为与海岸环境密切相关，但中尺度涡旋的动力演变仍存在许多未知因素。另一方面，该项目的首席研究员一直在利用极地轨道气象卫星NOAA的图像处理监测海面水温和速度矢量的大尺度模式，然后试图研究日本岛链周围的洋流结构和中尺度涡旋的实际运动。为了进一步发展上述研究，在本计画中，我们调查日本岛链周围流场中中尺度涡的实际行为。此外，我们还试图开发N 关于我们包括中尺度涡旋的海流数值计算方法。该项目的主要成果如下。（1）海洋湍流的卫星图像分析测量我们利用NOAA/AVHRR热红外资料进行了流场显示和海面速度测量。每天都通过捕获卫星数据对海洋湍流进行连续监测。结合上述卫星资料和已发表的海洋湍流资料，建立了日本岛链海洋湍流数据库。（2）海流数值模拟中嵌套方法的研究为了有效地将上述实测海流资料应用于海流数值模拟中，本文提出了一种新的海流模型嵌套方法，并应用于海流数值模拟中。通过计算结果与实测结果的比较，证实了本文方法的基本有效性。少