Argon isotope constraints on modification of oxygen isotopes in Iceland Basalts by surficial processes
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δ18O
Isotopes of argon
Crustal recycling
δ18O
Isotopes of argon
Crustal recycling
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Based on data of meteoric water hydrogen and oxygen isotopes and meteorology from 1986 to 1988 in Shijiazhuang and Taiyuan,we analyze the variation characteristics of stable isotopes in the two regions.It indicates that: 1) δD and δ18O in both regions show significant monsoon climate precipitation characteristics,which are high in the summer half year and low in the winter half year;2) The slope and intercept of meteoric water lines in Shijiazhuang and Taiyuan are smaller than that of China's meteoric water line equation;3) deuterium amount in both regions were relatively small,but both had seasonal characteristics,which was high in the winter half year and low in the summer half year;4) δ18O had relatively significant positive correlation with air temperature but weak positive correlation with precipitation in Shijiazhuang;δ18O had relatively significant negative correlation with precipitation but weak positive correlation with air temperature in Taiyuan.
δ18O
Positive correlation
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The variations of the stable isotope compositions in water provide critical information on hydroclimatic mechanisms. The climatological and hydrological processes in the Nujiang headwaters in the central Qinghai–Tibetan Plateau are extremely complex and are controlled by alternating continental/local recycled and maritime moisture. However, previous studies have only derived limited data from different types of water in the Nujiang headwaters. Therefore, aiming to understand the sources of stable oxygen (δ18O) and hydrogen (δ2H) isotopes’ compositional variability and how these are related to hydroclimatic processes, we measured δ18O and δ2H values from surface waters, snow and precipitation across the Nujiang headwaters from April to September 2018. We found higher δ18O (−13.7‰), δ2H (−101.8‰) and deuterium excess (d-excess; 7.6‰) values in the non-monsoon season and lower values in the summer monsoon season. Our findings indicated that the δ18O and δ2H compositions were significantly affected by different moisture sources in this region. The slope (6.66) and intercept (−14.90) of the surface water line (SWL: δ2H = 6.66 δ18O − 14.90, R2 = 0.98) were lower than those of the local meteoric water line (LMWL: δ2H = 9.50 δ18O + 41.80, R2 = 0.99) and global meteoric water line (GMWL), indicating that precipitation was the primary water vapor source for surface water, and evaporation was the dominant hydrological process for the Nujiang headwaters. In general, δ18O and δ2H tended to be negatively correlated with precipitation and air temperature. In addition, δ18O and δ2H values in the Nagqu River were inversely correlated with the intensity of discharge, highlighting a precipitation-driven isotope-discharge pattern. Our findings provide a theoretical basis for the hydroclimatic mechanisms occurring in the Nujiang headwaters and further augment our understanding of the southern–middle–northern hydroclimate in the Qinghai–Tibetan Plateau.
δ18O
East Asian Monsoon
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Isotopes of nitrogen
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δ18O
Stalagmite
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This paper researches the hydrogen and oxygen isotope compositions in precipitation in Baotou for eight years, and the meteoric water line was given: δD=6.36δ 18 O-5.21, which shows that some characteristics in the meteoric water line. The impact on precipitation isotope for the temperature and precipitation amount was analysed. The result shows that the impact factors of precipitation isotope was variational in the different seasons, and the degree of influence for several isotope effects is also various. The weighted-mean δD and δ 18 O values of precipitation tend to be more negative in January and December.
Line (geometry)
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The stable isotope composition of hydrogen (delta(2)H) and oxygen (delta(18)O) in monthly precipitation and river water (Sava River and Danube) samples in the Belgrade area gathered between 1992 and 2005 are determined. The local meteoric water line delta(2)H=7.8 (+/-0.2) delta(18)O+7.3(+/-1.6) (r(2)=0.98, n=60, sigma=0.52) for the whole period of observation is close to the global meteoric water line. The amount-weighted mean delta(2)H and delta(18)O values of precipitation were-65+/-27 per thousand and-9.4+/-3.4 per thousand, respectively. Good correlation between delta(18)O values (r approximately >0.67) and ambient temperature and relative humidity was obtained. Stream-water data ranged from-94 to-60 per thousand for delta(2)H and from-11.0 to approximately 5.7 per thousand for delta(18)O with highly statistically significant difference (p>0.01) between the Sava River and the Danube. In addition, the isotopic compositions of local precipitation and adjacent river water at monitoring sites were compared. Obtained data will give an opportunity to improve the knowledge of mixing stream water and local groundwater, and assessment of potential groundwater risks and pressures in the Belgrade basin.
δ18O
Oxygen-18
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Natural oxygen and hydrogen stable isotopes (δ18O-H2O and δD-H2O) in modern precipitation collected in five months event in 2001 in Northwestern Tunisia (El Kef area) are presented in this paper. The total correlation between δ18O and δD is obtained as the Global Meteoric Water Line and the Local Meteoric Water Line of the Tunis-Carthage. Seasonal variations of the precipitation D-excess provide more details for changes in moisture sources. The lower δD and δ18O values observed at the El Kef site reflect the combined effects of oceanic and sea vapor sources “Atlantic–Mediterranean origin”, fractionation due to local precipitation, and slower equilibration of the larger raindrops nucleated by a maritime aerosol.
δ18O
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The stable isotope compositions of soil water from the profiles at Jinan southern mountain reveal information about the mechanism of soil movement. The stable isotopes in soil water have a wide range from-8.92 to-5.95 forδ 18 O and-50.01 to-79.44 forδD . The mean isotope values is-7.75 forδ 18 O and 65.84 forδD. The low-δD of shallow (<5cm) soil water is due to the precipitation infiltration. And deep soil water (>5cm) is enrichment, which indicates the soil water is evaporated before recharging. The stable oxygen and hydrogen isotope are plotted near the meteoric water line. The trend line for the relationship between δ 18 O and δD of soil water is given.
Infiltration (HVAC)
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