Influence of Regional Cold Okhotsk SST upon Remote Atmospheric Circulation in Summer

• Main Author: Fujita, Satoshi
• Other Authors: Tachibana, Yoshihiro, 26529
• Format: Other/Unknown Material
• Language: English
• Published: 三重大学 2014
• Subjects: Okhotsk; okhotsk sea
• Online Access: https://mie-u.repo.nii.ac.jp/record/10556/files/2013M362.pdf

application/pdf Okhotsk Sea, it is a sea area has been a "sea of mystery" from the lack of observational data. Okhotsk Sea is the north of Japan; Okhotsk high that occurs in summer is heavily involved in cool summer and Baiu season in Japan. To correctly evaluate the influence of Okhotsk high is essential to weather forecast of Japan. However, as mentioned, Okhotsk Sea is a "sea of mystery" from the lack of observational data, the detailed mechanism of Okhotsk high has not yet been clear. In this study, using the radiosonde data in Okhotsk Sea, which was observed in 2006 and 1998, and the calculation results of regional climate model in close vertical resolution, to clarify how the low sea surface temperature (SST) in Okhotsk Sea affects the synoptic scale disturbance and the atmospheric boundary layer. SST used as boundary conditions in the model is higher than SST observed in Bussol Sea, where is known SST is very low. To estimate the effect of low SST gives the atmosphere in Bussol Sea around, providing a run with a lower 5K boundary conditions of the SST (COLD), which is compared with a normal run (CTL). From the observation, large surface inversion layer is observed in Bussol Sea. Surface inversion layer is reproduced in the COLD run. However it is not reproduced in the CTL. It is clear that this surface inversion is formed by low SST around Bussol Sea. In comparing the COLD run and CTL run, high pressure deviation in SST decrease area and low pressure deviation in the southwest are formed in COLD run. The contitions to be formed this low pressure deviation is that high pressure is the north and low pressure is the south across the Kuril Islands, and northeast wind blow on SST decrease area. It is considered wave of pressure associated with baroclinic instability wave has propagated and low pressure deviation is formed. The results of this study suggest that low SST of Bussol Sea affects remotely. Climate and Ecosystems Dynamics Division Graduate school of Bioresources Mie University 36 thesis