Periodic Variations Of Water Temperature In The Seas Around Korea(II). Annual And Long Term Variations Of Surface Water Temperature In The Regions Of Mishima And Okinoshima

한국 근해 수온의 주기적 변화(II). 삼도와 중지도 해역 표면수온의 년주변화 및 장주기 변화

Periodic characters of water temperature in the regions of the Mishima and the Okinoshima were derived through the analysis of the five days interval data during 1914 to 1970 mainly. In terms of ten days mean temperatures, annual variation function of the Mishima region, Korea Strait, is F($\theta_d$)=17.45-5.34 cos $\theta_d$-3.77 sin $\theta_d$+0.62 sin $2\theta_d$ -0.52 sin $3\theta_d$, where $\theta_d$=$\frac{\pi}{18}$(d-2), d is the order of ten days period 1 to 36. And in the region of Okinoshima, Tsushima Strait, we find F($\theta_d$)=18.88-5.39 cos $\theta_d$-3.60 sin $\theta_d$+0.52 sin $2\theta_d$. The annual mean temperature is 17.4$^{\circ}C$ in the Mishima region, 18.9$^{\circ}C$ in the Okinoshima region, and the amplitudes of annual variation functions are 7$^{\circ}C$ in both regions with minimum temperature in the middle ten days of February, maximum in the middle ten days of August. The long term variations of surface water temperature with 12 5 years period were observed in the annual mean temperature, monthly mean temperatures and the fixed day temperatures of every year. In addition to these, relatively short term variations were also found significant periods of 3 years, 4 years and 2 years, respectively.

수권(Hydrosphere)은 기권(Atmosphere)과 암권(Lithosphere)의 중간에 있으며 이에 대한 연구는 지구 물리학 분야에서 가장 중요하게 다루어 지는 것 중의 하나이다. 특히 수권의 70% 이상을 차지하고 있는 해양에서의 환경 변화를 조사하는 것은 해황의 변동을 예측하여 수산업이나 기타의 해중 시설물을 설치하는 데 중요한 자료를 제공해 주는 기초 적인 분야이다.