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A new type research on hydrographic state using satellite-derived sea surface temperature, sea surface height, and solar insulation

利用卫星获取的海面温度、海面高度和太阳绝缘性进行水文状态的新型研究

基本信息

批准号：
04640408
负责人：
KAWAMURA Hiroshi
金额：
$ 0.96万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Using satellite-derived Sea Surface Temperature (SST), Sea Surface Height (SSH), and Solar Insulation, hydrographic state around Japan is investigated.Main results of the research is ;1.Derivation systems of the SST from AVHRR data and the SSH from the Topex altimeter data have been established.2.The sea surface cooling event caused by the passage of typhoons is found in the Tohoku area. The reason of the event is examined using the satellite SST,hydrographic observation data, and the numerical model, and is proved to be related to the vertical mixing of the strong wind and the stratification condition in the Tohoku Area.3.The SSHs derived from the Topex altimeter data are compared with the hydrographic observation data in the Tohoku Area. The satellite SSH has an rms error of about 13cm. The comparison with the SST images is also made, and good agreement is proved.4.A derivation method of the daily solar insulation over the ocean is developed, and one year estimation of the insulation is made. The validation of the estimated insulation using ship-observed insulation data shows an rms error of about 20W/m^2.5.The hydrographic state in the Pacific ocean off the Hokkaido is investigated using the Topex SST and the hydrographic observation data. The geostrophic velocities estimated from the SSH agrees well with those measured by moored current meter. The correlation coefficient is 0.55 and the rms error is 7.6cm/s. The combination of the satellite SSH,SST,and the hydrographic data is proved to contribute to detailed analyzes of the hydrographic state in this area.6.Using the satellite SST and SSH,wavy patterns propagating toward west at around the Subtropical front is found. The pattern has a wavelength of 800-1000km, and the phase speed of 7-8cm/s, and a characteristic period of 3-6months.

利用卫星反演的海表温度（SST）、海表高度（SSH）和太阳隔热率（Solar Insulation）资料，研究了日本周边地区的水文状况，主要结果如下：1.建立了AVHRR资料反演SST和Topex高度计资料反演SSH的系统; 2.在日本东北地区发现了台风过境引起的海表冷却事件。利用卫星SST、水文观测资料和数值模式分析了此次事件的成因，证实其与东北地区强风的垂直混合和层结条件有关。3.将Topex高度计资料反演的SSH与东北地区的水文观测资料进行了比较。卫星SSH的均方根误差约为13厘米。建立了海洋日太阳隔热量的计算方法，并对海洋日太阳隔热量进行了一年的估算。利用船舶绝缘观测资料对估算的绝缘值进行了验证，其均方根误差约为20 W/m^2。5.利用Topex SST和水文观测资料对北海道外太平洋的水文状况进行了研究。由SSH估算的地转流速与系留海流计测量的结果吻合较好。相关系数为0.55，均方根误差为7.6cm/s。6.利用卫星SST和SSH资料，在副热带锋附近发现了向西传播的波浪型，其波长为800- 1000 km，相速为7- 8 cm/s，特征周期为3- 6个月。