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(SST)、海面高度(SSH)和太阳绝热系数，对日本周边地区的水文状况进行了研究。主要研究结果如下：1.建立了由AVHRR资料推算SST和TOPEX高度计资料推算SSH的系统。2.在东北地区发现了台风过境引起的海面降温事件。利用卫星海温资料、水文观测资料和数值模式分析了这次天气过程的成因，认为这与东北地区大风的垂直混合和层结条件有关。3.将TOPEX高度计资料得到的SSHs与东北地区的水文观测资料进行了对比。卫星SSH的均方根误差约为13厘米。并与SST图像进行了对比，取得了较好的一致性。4.提出了一种海洋日太阳保温量的计算方法，并对其进行了一年的估算。利用船舶观测的绝缘数据对估计的绝缘进行了验证，其均方根误差约为20W/m^2.5。利用Topex SST和水文观测数据研究了北海道附近太平洋的水文状况。由SSH估算的地转速度与系泊流速仪测得的结果吻合较好。相关系数为0.55，均方根误差为7.6 cm/S。卫星SSH、SST和水文资料的结合有助于详细分析该地区的水文状况。6.利用卫星SST和SSH，发现副热带锋附近有向西传播的波型。该模式波长800-1000公里，相速度7-8厘米/S，特征周期为3-6个月。

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.