Journal of the Korean Geographical Society (대한지리학회지)

The Korean Geographical Society (대한지리학회)
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East Asian Monsoon History as Indicated by C/N Ratios and ${\delta}^{13}C$ Evidence from the Estuarine Tidal Flat Sediments in the West Coast of Korea

서해안 염하구 습지 퇴적물의 지화학적 분석 (C/N 및 ${\delta}^{13}C$)에 기반한 동아시아 몬순 변동 연구

  • Received : 2010.08.17
  • Accepted : 2010.09.25
  • Published : 2010.10.31
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Abstract

Geochemical and physical investigations such as ${\delta}^{13}C$ isotope ratio, carbon/nitrogen (C/N) ratio, magnetic susceptibility (MS), and particle size analyses were carried out on the estuarine tidal flat sediments from the west coast of Korea in order to reconstruct the East Asian summer monsoon variability during the late Pleistocene and Holocene Our results indicated that the summer monsoon probably peaked around 7,700-7,800 yr BP and then started to decline about 7,400 yr BP in the Korean peninsular, and that the monsoon was relatively weak between 24,000-24,500 yr BP but relatively strong between 18,500-19,500 yr BP during the Last Glacial Maximum. Our estuarine geochemical data have proven to be valuable as a new proxy for detecting the shifts in monsoon strength. This new evidence will be helpful, especially for Korean paleoenvironmental studies with few proxy data archives.

후기 플라이스토신 및 홀로신 시기 동아시아 여름 몬순의 변화를 밝히기 위해 지화학적 분석 방법(탄소동원원소(${\delta}^{13}C$), 탄질율(C/N), 대자율, 입도 분석 등)을 활용하여 서해안 염하구 습지 퇴적물을 분석하였다. 연구 결과에 따르면 한반도에서 여름 몬순은 7,700-7,800년 전에 정점이었고 7,400년 전 경부터 약화되기 시작한다. 그리고 마지막 빙하 최성기 중 24,000-24,500년 전 경에는 몬순이 상대적으로 약했고 18,500-19,500년 전 경에는 상대적으로 강했다. 염하구 습지 퇴적물의 지화학적 분석 자료는 과거 여름 몬순의 변동을 밝힐 수 있는 새로운 고환경 자료로서 가치를 갖는다. 특히 고환경 자료가 부족한 한국 학계에 큰 도움이 될 것으로 사료된다.

Keywords

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