• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.04a
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• pp.242-245
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• 2003

본 연구는 무주군 적상산 부근에 위치하는 소유역에서 지표수와 인접한 천층 지하수의 안정동위원소 조성의 시공간적 변화를 규명하기 위해서 시행되었다. 조사는 2001년 8월과 10월, 2002년 4월 세 차례에 걸쳐 수행되었다. 각 계절에 따라 지표수와 지하수의 안정동위원소 조성이 비슷하게 나타나는 것은 이 지역 지표수와 지하수사이에는 배수와 충진이 지속적으로 생기고 있음을 암시한다. 조사지역의 안정동위원소 조성은 북쪽에 위치하는 한강의 안정동위원소 조성보다는 무거우며, 남쪽에 위치하는 섬진강의 안정동위원소 조성보다는 가벼운 위도효과를 잘 나타내고 있다. 또한 시료를 채취한 가장 높은 지점과 가장 낮은 지점의 고도차가 400m인 작은 소유 역에서도 계절의 변화와 관계없이 안정동위원소의 고도효과는 잘 나타나고 있다. 선행된 연구에서 우리나라 강우가 우량효과를 반영하는 결과를 나타내는 것과 같이 강우의 영향을 직접 받는 8월 지표수의 안정동위원소 조성은 10월과 4월보다 더 가벼운 조성을 나타내고 있다.

• Journal of Marine Life Science
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• v.7 no.2
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• pp.61-73
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• 2022

Stable isotope analysis (SIA) is being used in various research fields including environmental science, ecology, biogeochemistry, forensics, and archeology. In this paper, for the purpose of enhancing applications and utilizations stable isotope analysis techniques to aquaculture research, we would like to introduce the background knowledge necessary to utilize stable isotope analysis techniques. In particular, with a focus on the approach using natural abundance, the principle of fractionation (change in isotope ratio) that occurs in the process of the integration of elements into biological tissues and how stable isotope ratios are determined by fractionation. This paper is intended to suggest whether SIA is used as a valuable tool in the fields of ecology and environmental science. With the understanding of the field of stable isotopes through this paper, various applications of stable isotope ratios are expected in fisheries science and aquaculture research in the future.

• Radioisotope journal
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• v.20 no.4
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• pp.57-64
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• 2005

• Economic and Environmental Geology
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• v.50 no.6
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• pp.517-523
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• 2017

A linear relationship between two stable water isotopes, oxygen and hydrogen, has been used to understand the water cycle as a basic tool. A slope and intercept from the linear relationship indicates what kind of physical processes occur during movement of water. Traditionally, ordinary least squares (OLS) method has been utilized for the linear relationship, but total least squares (TLS) method provides more accurate slope and intercept theoretically because isotopic compositions of both oxygen and hydrogen have uncertainties. In this work, OLS and TLS were compared with isotopic compositions of snow and snowmelt collected from the King Sejong Station, Antarctica and isotopic compositions of water vapor observed by Lee et al. (2013) in the western part of Korea. The slopes from the linear relationship of isotopic compositions of snow and snowmelt at the King Sejong Station were estimated to be 7.00 (OLS) and 7.16(TLS) and the slopes of stable water vapor isotopes were 7.75(OLS) and 7.87(TLS). There was a melting process in the snow near the King Sejong Station and the water vapor was directly transported from the ocean to the study area based on the slope calculations. There is no significant difference in two slopes to interpret the physical processes. However, it is necessary to evaluate the slope differences from the two methods for studies for example, groundwater recharge processes, using the absolute slope values.

• Radioisotope journal
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• v.21 no.2
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• pp.19-25
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• 2006

• Journal of the Korean earth science society
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• v.35 no.2
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• pp.97-103
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• 2014

An isotopic hydrograph separation technique has been able to determine the contribution of new water (event water such as rain or snowmelt) and old water (pre-event water like groundwater) to a stream hydrograph for last several decades using stable water isotopes. It is based on the assumption that the isotopic compositions of both new water and old water at a given instant in time are known and the stream water is a mixture of the two waters. In this study, we show that there is a systematic error (standard error in the new water fraction) in the isotopic hydrograph separation if the average isotopic compositions of new water were used ignoring the temporal variations of those of new water. The standard error in the new water fraction is caused by: (1) the isotopic difference between the average value and temporal variations of new water; (2) the new water fraction as runoff contributing to the stream during rainfall or spring melt; and (3) the isotopic differences between new and old water (inversely). The standard error is large, in particular, when new water dominates the stream flow, such as runoff during intense rainfall and in areas of low infiltration during spring melt. To reduce the error in the isotopic hydrograph separation, incorporation of fractionation in the isotopic composition of new water observed at a point should be considered with simultaneous sampling of new water, old water and stream water.

• Radioisotope journal
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• v.20 no.2
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• pp.25-27
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• 2005

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.04a
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• pp.417-420
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• 2004

이 연구는 안정동위원소를 이용하여 제주도 한림 지역의 지하수 환경 및 오염 특성을 규명하고자 시행되었다. 이를 위해 2002년 8월, 11월과 2003년 4월, 8월 네 차례에 걸쳐 39개 지점에서 지하수 및 용천수 시료를 채취하였다. 연구지역은 농촌지역의 대표적 오염특성인 질산성 질소의 오염이 심각하게 나타났으며, 고도 100m 내외에서 급증하는 특성을 보인다. 특히, 집중 강수가 있었던 8월에는 이러한 현상이 심화되었다. 질소 동위원소를 이용한 오염원 추정 결과, 대부분 화학비료의 영향으로 나타났으며, 이는 토지 이용 특성과 일치한다. 강수의 산소ㆍ수소 동위원소 조성은 '우량효과'를 반영하였으며, 지하수 시료들의 경우 함양에서 배출까지 순환이 매우 빠른 지하수 환경을 나타낸다.

• Economic and Environmental Geology
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• v.48 no.5
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• pp.371-377
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• 2015

Isotopic compositions of precipitation have been used to understand moisture transport in the atmosphere and interactions between precipitation and groundwater. Isotopic compositions of speleothems and ice cores, so called, ''paleoarchives'', can be utilized to interpret climate of the past and global circulation models (GCMs). The GCMs are able to explain the paleoarchives, can be validated by the precipitation isotopes. The developments of stable isotope analyzers make high-resolution isotopic studies feasible. Therefore, a high-resolution study of precipitation isotopes is needed. For this study, precipitation samples were collected for every 5 to 15 minutes, depending on precipitation rates, using an auto-sampler for precipitation isotopes near coastal area. The isotopic compositions of precipitation range from -5.7‰ (-40.1‰) to -10.8‰ (-74.3‰) for oxygen (hydrogen). The slope of ${\delta}^{18}O-{\delta}D$ diagram for the whole period is 6.8, but that of each storm is 5.1, 4.2, 7.9 and 7.7, respectively. It indicates that evaporation occurred during the first two storms, while the latter two storm did not experience any evaporation. The isotopic fractionations of precipitation has significant implications for the water cycle and high-resolution data of precipitation isotopes will be needed for the future studies.

• Korean Journal of Heritage: History & Science
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• v.49 no.4
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• pp.38-51
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• 2016

This study reports on human dietary reconstruction of Joseon Dynasty using stable isotope analysis. The stable carbon and nitrogen isotope values were measured of bone collagen extracted from 25 human bones from archaeological site in Myeongam-ri, Asan. Average values of ${\delta}^{13}C$ and ${\delta}^{15}N$ are $-19.7{\pm}0.5$‰(n=23) and $9.6{\pm}1.1$‰(n=23), respectively. The isotopic data indicates that Myeongam-ri individuals consumed $C_3$ plants mainly and assumed of dietary resourced from a terrestrial animal protein. Previous isotopic studies of the Joseon era suggested that dietary composition of Joseon population was not influenced by region and burial type. Also comparison of the isotopic results of male and female from double burials showed sex-dependent dietary patterns among individuals living in the same circumstances.