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하계 대한해협 저층냉수의 물리·화학적인 특성 및 기원

Physicochemical Properties and the Origin of Summer Bottom Cold Waters in the Korea Strait

김일남|이동섭
한국해양과학기술원 (Korea Institute of Ocean Science & Technology)|2004.12|Ocean and Polar Research|제26권 제4호|pp. 595-606

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참고문헌

키워드

대한해협Korea Strait최적화 다인자 분석대한해협 저층냉수동해 순환OMPKorea Strait Cold WaterEast Sea circulation
주제분류해양학

초록

Abstract

Hydrographic survey in the Korea Strait has long history that has begun in August 1917 at the Busan - Tsushima cross section, still continues to date. However, chemical properties of bottom cold water found exclusively in the western channel of the Korea Strait during summer did not receive much scientific attention. The aim of the study is to decipher the enigmatic origin of the Korea Strait Bottom Cold Water (KSBCW) in terms of chemical properties. The physicochemical properties of the KSBCW are extracted from the CREAMS II hydrographic data. OMP method was applied to analyze origin of the KSBCW quantitatively. The KSBCW is well defined by low temperature below 10oC. The cold waters exhibited the local presence near the coast at about 120 m depth with a thickness of 20 m to 30 m. The cold water was characterized by relatively cold, saline and higher chemical concentrations than adjacent waters. The KSBCW seems to have different origin from that of the coastal upwelled waters at the Ulgi-Gampo because it is saline, denser and contains considerably less dissolved oxygen than upwelled waters. The physicochemical properties are reported to have noticeable annual variations which suggest the complex origin of the KSBCW. OMP analysis show that the KSBCW is a mixture of three water types; TMW (24%), ESIW (36%) and ESPW (40%). Relationship between the KSBCW and the East Sea circulation is traced by mapping the water masses that have similar T, S and DO of KSBCW. The result showed that the KSBCW is most possibly an extension of southward flowing coastal intermediate waters. From these results, we expect that the monitoring KSBCW will provide us valuable information about the East Sea circulation.

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