Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Potential Impacts of Climate Change on Water Temperature of the Streams in Han-River Basin

기후변화 시나리오별 한강유역의 수계별 수온상승 가능성

  • Kim, Minhee (Hanriver Basin Environmental office, Ministry of Environment) ;
  • Lee, Junghee (Hanriver Basin Environmental office, Ministry of Environment) ;
  • Sung, Kyounghee (Hanriver Basin Environmental office, Ministry of Environment) ;
  • Lim, Cheolsoo (Hanriver Basin Environmental office, Ministry of Environment) ;
  • Hwang, Wonjae (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Hyun, Seunghun (Department of Environmental Science and Ecological Engineering, Korea University)
  • 김민희 (환경부 한강유역환경청 측정분석과) ;
  • 이정희 (환경부 한강유역환경청 측정분석과) ;
  • 성경희 (환경부 한강유역환경청 측정분석과) ;
  • 임철수 (환경부 한강유역환경청 측정분석과) ;
  • 황원재 (고려대학교 환경생태공학과) ;
  • 현승훈 (고려대학교 환경생태공학과)
  • Received : 2021.11.16
  • Accepted : 2021.12.21
  • Published : 2022.01.30
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Abstract

Climate change has increased the average air temperature. Rising air temperature are absorbed by water bodies, leading to increasing water temperature. Increased water temperature will cause eutrophication and excess algal growth, which will reduce water quality. In this study, long-term trends of air and water temperatures in the Han-river basin over the period of 1997-2020 were discussed to assess the impacts of climate change. Future (~2100s) levels of air temperature were predicted based on the climate change scenarios (Representative concentration pathway (RCP) 2.6, 4.5, 6.0, and 8.5). The results showed that air and water temperatures rose at an average rate of 0.027℃ year-1 and 0.038℃ year-1 respectively, over the past 24 years (1997 to 2020). Future air temperatures under RCP 2.6, 4.5, 6.0, and 8.5 increased up to 0.32℃ 1.18℃, 2.14℃, and 3.51℃, respectively. An increasing water temperature could dissolve more minerals from the surrounding rock and will therefore have a higher electrical conductivity. It is the opposite when considering a gas, such as oxygen, dissolved in the water. Water temperature also governs the kinds of organisms that can live in rivers and lakes. Fish, insects, zooplankton, phytoplankton, and other aquatic species all have a preferred temperature range. As temperatures get too far above or below this preferred range, the number of individuals of the species decreases until finally there are none. Therefore, changes of water temperature that are induced by climate change have important implications on water supplies, water quality, and aquatic ecosystems of a watershed.

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