scholarly journals Isotopes of oxygen-18 and deuterium in precipitation in Slovakia / Izotopy kyslíka-18 A deutéria v zrážkach na Slovensku

2012 ◽  
Vol 60 (4) ◽  
pp. 265-276 ◽  
Author(s):  
Ladislav Holko ◽  
Michal Dóša ◽  
Juraj Michalko ◽  
Martin Šanda
Keyword(s):  
Isotopic Composition ◽  
Air Temperature ◽  
Meteoric Water ◽  
Precipitation Amount ◽  
Data Series ◽  
Water Line ◽  
Temperature And Precipitation ◽  
Meteoric Water Line ◽  
The Mean ◽  
Available Information

The article synthesizes available information on isotopic composition of precipitation in Slovakia (the Western Carpathians). Monthly δ18O data from eleven stations and period 1988-1997 were used to investigate correlations among the stations, altitude, air temperature and precipitation amount effects. The mean annual altitude and air temperature gradients of δ18O in precipitation were 0.21‰/100 m and 0.36‰/1°C, respectively. Maps of spatial distribution of mean annual δ18O in precipitation based on both gradients were constructed. The two maps do not significantly differ for the majority of Slovakia. δ2H data were available for only three stations. Local meteoric water line derived for the station with the longest data series (δ2H = = 7.86δ18O + 6.99) was close to the Global Meteoric Water line. Its parameters in periods 1991-1993 and 1991-2008 did not change. The study indicates that a more detailed monitoring of isotopic composition of precipitation in mountains should be carried out in the future. The highest station exhibited very small seasonal variability of δ18O in precipitation compared to other Slovak stations. The second highest mountain station had significantly higher deuterium excess than the neighboring stations located in the valley. In some analyses the data from the nearest stations situated abroad (Vienna, Krakow) were used.

Isotopic composition of precipitation in a topographically steep, seasonally snow-dominated watershed and implications of variations from the global meteoric water line

2016 ◽  
Vol 30 (24) ◽  
pp. 4582-4592 ◽  
Author(s):  
Daniel J. Tappa ◽  
Matthew J. Kohn ◽  
James P. McNamara ◽  
Shawn G. Benner ◽  
Alejandro N. Flores
Keyword(s):  
Isotopic Composition ◽  
Meteoric Water ◽  
Water Line ◽  
Meteoric Water Line ◽  
Global Meteoric Water Line

scholarly journals Long-Term Isotope Records of Precipitation in Zagreb, Croatia

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 226 ◽  
Author(s):  
Ines Krajcar Bronić ◽  
Jadranka Barešić ◽  
Damir Borković ◽  
Andreja Sironić ◽  
Ivanka Lovrenčić Mikelić ◽  
...  
Keyword(s):  
Meteoric Water ◽  
Isotope Composition ◽  
Eastern Mediterranean ◽  
Meteorological Data ◽  
Precipitation Amount ◽  
Monthly Precipitation ◽  
Air Masses ◽  
Water Line ◽  
Meteoric Water Line

The isotope composition of precipitation has been monitored in monthly precipitation at Zagreb, Croatia, since 1976. Here, we present a statistical analysis of available long-term isotope data (3H activity concentration, δ2H, δ18O, and deuterium excess) and compare them to basic meteorological data. The aim was to see whether isotope composition reflected observed climate changes in Zagreb: a significant increase in the annual air temperature and larger variations in the precipitation amount. Annual mean δ18O and δ2H values showed an increase of 0.017‰ and 0.14‰ per year, respectively, with larger differences in monthly mean values in the first half of the year than in the second half. Mean annual d-excess remained constant over the whole long-term period, with a tendency for monthly mean d-excess values to decrease in the first half of the year and increase in the second half due to the influence of air masses originating from the eastern Mediterranean. Changes in the stable isotope composition of precipitation thus resembled changes in the temperature, the circulation pattern of air masses, and the precipitation regime. A local meteoric water line was obtained using different regression methods, which did not result in significant differences between nonweighted and precipitation-weighted slope and intercept values. Deviations from the Global Meteoric Water Line GMWL (lower slopes and intercepts) were observed in two recent periods and could be explained by changes in climate parameters. The temperature gradient of δ18O was 0.33‰/°C. The tritium activity concentrations in precipitation showed slight decreases during the last two decades, and the mean A in the most recent period, 2012–2018, was 7.6 ± 0.8 Tritium Units (TU).

scholarly journals Study on the isotopic compositionof rainwater in Long Khanh city,Southeast of the Mekong Delta region

2021 ◽  
Vol 63 (8) ◽  
pp. 14-18
Author(s):  
Quang Tri Bui ◽  
◽  
Thi Thu Huong Huynh ◽  
Uyen Thi Pham ◽  
Thi Bich Chi Duong ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Meteoric Water ◽  
Mekong Delta ◽  
Reference Value ◽  
Isotope Ratios ◽  
Global Scale ◽  
Delta Region ◽  
Water Line ◽  
Average Value ◽  
Meteoric Water Line

The 2H/1H and 18O/16O isotope ratios in rainwater bring a lot of information about the fractionation of water molecules in the hydrosphere. The relationship between the isotope ratios of rainwater in an area characterised by the local meteoric water line, which is known as a reliable reference value for studies related to the identification of the recharge source of groundwater and climate change investigations. This study aims to establish a local meteoric water line in Long Khanh city (LK LMWL) in the period of 2020-2021, which is considered as a basis for research on the origin of groundwater in the area of Long Khanh city and subsequent studies on the origin of groundwater in the Southeast of the Mekong Delta region and the Dong Nai river basin. Results show that δ2H in rainwater ranges from -73.64 to 0.36 (‰ VSMOW) with an average value of -49.74‰ (n=19) and that figure of δ18O ranges from -10.91 to -1.59 (‰ VSMOW) with a mean of -7.68‰ (n=19). Due to the amount and specific meteorological conditions of the region, δ2H and δ18O in rainwater are enriched in the dry season but deplete in the rainy season. The LK LMWL follows a model of δ2H=(7.89±0.38)xδ18O + (10.28±2.93) (R2=0.96, n=19), which shows that the isotopic composition of δ18O in rainwater is more enriched than the isotopic composition of δ2H. The deuterium excess (d-excess) of rainwater in the region is found to be 10.28±2.93‰, which is comparable to those for the global scale of 10‰.

Temporal Variation in Stable Isotopic Composition of Rainfall and Groundwater in a Tropical Dry Forest in the Northeastern Caribbean

2013 ◽  
Vol 17 (27) ◽  
pp. 1-20 ◽  
Author(s):  
Y. Govender ◽  
E. Cuevas ◽  
L. D. S. Sternberg ◽  
M. R. Jury
Keyword(s):  
Puerto Rico ◽  
Isotopic Composition ◽  
Temporal Variation ◽  
Groundwater Recharge ◽  
Meteoric Water ◽  
Dry Forest ◽  
Water Line ◽  
Isotopic Signatures ◽  
Meteoric Water Line ◽  
Stable Isotopic

Abstract Karst topography links rainfall to groundwater recharge; therefore, possible changes in the hydrology can play an important role in ecosystem function especially in tropical dry forests where water is the most limiting resource. This study investigates the temporal variation in isotopic composition (δ18O and δD values) of rainwater and groundwater in the Guánica Dry Forest of southwestern Puerto Rico. The study not only establishes a dataset of oxygen and hydrogen isotopic composition of rainwater to assist in local ecohydrological studies but also establishes the origin of rainfall in the semiarid region of the island. The geographical position of Puerto Rico in the northeastern Caribbean causes the study site to receive marine air masses from the North Atlantic Ocean and Caribbean Sea. This research documents the monthly to annual variability in stable isotopic composition of rainwater and estimates the source of groundwater recharge in the Guánica Dry Forest. To calculate the local meteoric water line (LMWL), the authors analyzed the isotopic signatures of rainwater, collected at near-monthly intervals from January 2008 to December 2011. The LMWL (δD = 7.79δ18O + 10.85) is close to the global meteoric water line (δD = 8.17δ18O + 11.27). Isotopic signatures of rainwater for the Guánica Dry Forest are consistent with southeastern Caribbean, where rainfall is of marine origin with an annual cycle contributed by sea surface temperature (SST) and significant intermonthly fluctuations due to rainfall and winds during tropical weather events. The d-excess values in the period of data collection (2008–11) respond to the rainfall–evaporation balance, with little seasonal cycle and strong pulsing events. Comparison of rain and groundwater isotopic compositions in the United Nations Educational, Scientific and Cultural Organization (UNESCO) Man and the Biosphere Programme (MAB) Guánica Dry Forest indicates that groundwater recharge is confined to rainfall events of more than 90 mm. Imbalances between rainfall and drought place cumulative stresses on ecosystems where plants and animals synchronize their growth phenology and reproduction to climatic patterns, especially in areas with variable annual cycles. Therefore, it is useful in ecohydrological studies to determine the origins and temporal dynamics of rainfall and groundwater recharge in the Caribbean, where predictions of climate models indicate drying trends.

scholarly journals Isotope Composition of Precipitation, Groundwater, and Surface and Lake Waters from the Plitvice Lakes, Croatia

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2414
Author(s):  
Ines Krajcar Bronić ◽  
Jadranka Barešić ◽  
Andreja Sironić ◽  
Ivanka Lovrenčić Mikelić ◽  
Damir Borković ◽  
...  
Keyword(s):  
Air Temperature ◽  
Lake Water ◽  
Isotope Composition ◽  
Precipitation Amount ◽  
Ordinary Least Squares ◽  
Water Line ◽  
Significant Difference ◽  
The Mean ◽  
Lake Waters ◽  
Plitvice Lakes

The application of tritium, 2H, and 18O in the characterization of the precipitation, groundwater, and surface and lake water of the Plitvice Lakes (PL), Croatia, over the 1979–2019 period is presented. An increase in the mean annual air temperature of 0.06 °C/year and in the annual precipitation amount of 10 mm/year is observed. The good correlation of the tritium activity concentration in the PL and Zagreb precipitation implies that the tritium data for Zagreb are applicable for the study of the PL area. The best local meteoric water line at PL was obtained by the reduced major axis regression (RMA) and precipitation-weighted ordinary least squares regression (PWLSR) approaches: δ2HPWLSR = (7.97 ± 0.12) δ18O + (13.8 ± 1.3). The higher deuterium excess at PL (14.0 ± 2.2 ‰) than that at Zagreb reflects the higher altitude and influence of the Mediterranean precipitation. The δ2H in precipitation ranges from −132.4‰ to −22.3‰ and δ18O from −18.3 ‰ to −4.1‰. The much narrower ranges in the groundwater (<1‰ in δ18O, <10‰ in δ2H) indicate the good mixing of waters in aquifers and short mean residence times. The higher average δ2H in all three karst springs observed after 2003 can be attributed to the increase in the mean air temperature. The mean δ2H and δ18O values in the surface and lake water increase downstream due to the evaporation of surface waters. There is no significant difference between the surface water line and the lake water line (2011–2014). The stable isotope composition of the surface and lake waters reacts to extreme hydrological conditions.

scholarly journals A new local meteoric water line for Inuvik (NT, Canada)

2021 ◽  
Author(s):  
Michael Fritz ◽  
Sebastian Wetterich ◽  
Joel McAlister ◽  
Hanno Meyer
Keyword(s):  
Isotopic Composition ◽  
Meteoric Water ◽  
Environmental Geochemistry ◽  
Sampling Period ◽  
Water Line ◽  
Meteoric Water Line ◽  
Oxygen And Hydrogen Isotopes ◽  
Western Arctic ◽  
Stable Oxygen ◽  
Data Gap

Abstract. The paper presents a new local meteoric water line (LMWL) of precipitation stable oxygen and hydrogen isotopes from Inuvik in the Western Canadian Arctic. Data were obtained over 37 months between August 2015 and August 2018 resulting in 134 measurements of the isotopic composition of both types of precipitation, snow and rain. For 33 months of the sampling period each month is represented at least two times from different years. The new LMWL from Inuvik is characterized by a slope of 7.39 and an intercept of –6.70, and fills a data gap in the Western Arctic where isotopic composition data of precipitation are scarce and stem predominantly from before the year 1990. Regional studies of meteorology, hydrology, environmental geochemistry and paleoclimate will likely benefit from the new Inuvik LMWL.

scholarly journals Characteristics and moisture sources of the stable isotopes in precipitation in the monsoon marginal region of north-central China

2021 ◽  
Author(s):  
Yiping Zhang ◽  
Junliang Xu ◽  
Yafei Yan ◽  
Wei Su ◽  
Zhiqiang Shi ◽  
...  
Keyword(s):  
Meteoric Water ◽  
Precipitation Amount ◽  
Central China ◽  
Positive Temperature ◽  
North Central ◽  
Water Line ◽  
Moisture Sources ◽  
Meteoric Water Line ◽  
Δd And Δ18o ◽  
Marginal Region

The stable hydrogen and oxygen isotopes in precipitation (δD and δ18O, respectively) are important source signatures for understanding the hydrological cycle and paleoclimatic reconstruction. In this study, 32 precipitation samples were collected from April to October 2014 at the Luya Mountain summit, a representative site in the monsoon marginal area of north-central China. The isotopic signatures of precipitation exhibited strong seasonal variations ranging from -185.61‰ to -18.50‰ and -25.51‰ to -4.59‰ for δD and δ18O, respectively, which were relatively higher in August and lower in September. The local meteoric water line was δD=(7.95±0.16) δ18O+(15.79±1.77) (R2 = 0.988, N = 32, p < 0.001), which had a similar slope but higher intercept than that of the global meteoric water line, indicating that the precipitation in this area is mainly sourced from the ocean surface transported via monsoons. Additionally, the secondary evaporated water by continental recycled moisture was identified by the significantly higher deuterium excess value (16.09‰). Backward trajectories generated via the Hybrid Single-Particle Lagrangian Integrated Trajectory model indicated seasonal moisture transport changes in the studied monsoonal marginal region, in which the main moisture sources were the Westerly winds in April, the Pacific Ocean in July, and the Indian Ocean in September. Secondary evaporated water from the alpine ecosystem may also influence the local atmospheric water cycle throughout the year. Positive temperature-isotopic signature effect (δD and δ18O) was observed in the cold season (before mid-May); however, the precipitation amount effect was observed in the monsoon season from June to August, and both effects became vague across the entire period. These findings suggest that the stable isotope compositions of precipitation can be utilized to determine the moisture sources in the monsoon marginal region of north-central China and potentially be utilized to reconstruct the precipitation signals in this region.

Stable isotope tracers as diagnostic tools in studying water sources in a humid bamboo watershed during the plum rainfall events

Water Policy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 368-381
Author(s):  
Jianfeng Gou ◽  
Simin Qu ◽  
Peng Shi ◽  
Dachen Li ◽  
Xueqiu Chen ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Isotopic Composition ◽  
Temporal Variation ◽  
Soil Water ◽  
Meteoric Water ◽  
Water Sources ◽  
Rainfall Events ◽  
Water Line ◽  
Isotopic Variation ◽  
Meteoric Water Line

Abstract This study investigates the temporal variation of stable isotopic composition in precipitation, soil water, and streamflow water during the plum rainfall events in an upland headwater watershed which is mainly covered with bamboo. The results show that the isotopic composition of various water sources exhibit significant temporal variation. The local meteoric water line is established by using the relationship between the stable isotope of oxygen-18 and deuterium, which is slightly different from the meteoric water line of China. The isotopic temporal variation of precipitation is closely related to exchange effect between raindrops and environmental vapor, evaporation fractionation and rainfall intensity. The isotopic variation of shallow soil water is mainly determined by canopy interception, ground evaporation and the mixing with pre-event water; as for the isotopic variation of deep soil water, it is virtually influenced by pre-event water. The most enriched isotopic composition of streamflow and deuterium excess (d-excess) differences between streamflow and rainfall both indicate that streamflow is recharged not only by event water but also by pre-event water. Hence, a better understanding of precipitation formation and the hydrological response under the plum rainfall system may be instructive for the management of water resources in humid watersheds in southern China.

scholarly journals Determination of isotopic composition of rainwater to generate local meteoric water line in Thohoyandou, Limpopo Province, South Africa

Water SA ◽  
2019 ◽  
Vol 45 (2 April) ◽  
Author(s):  
Olatunde S Durowoju ◽  
John O Odiyo ◽  
Georges-Ivo E Ekosse
Keyword(s):  
Isotopic Composition ◽  
Meteoric Water ◽  
Limpopo Province ◽  
Seasonal Effect ◽  
Weighted Mean ◽  
Water Line ◽  
Meteoric Water Line ◽  
Wide Range ◽  
Continental Effect ◽  
Rain Formation

Hydrogen (D) and oxygen (18O) isotopic compositions of precipitation are useful tools to delineate the nature of precipitation, groundwater recharge and climatological investigations. This study investigated the isotopic composition of 12 rainfall occurrences at Thohoyandou, with the objective of generating the local meteoric water line (LMWL) and determining the factors controlling the isotopic composition of the rain. The delta (δ) values for D and 18O of the samples were determined using a Thermo Delta V mass spectrometer connected to a Gasbench. Thohoyandou rainwater showed a wide range of stable isotope values; δD values of the rainwater varied from −76.3‰ to +22.7‰ (SMOW) with a weighted mean of −9.8‰ and δ18O values ranged from −10.78‰ to +3.07‰ (SMOW) with a weighted mean of −2.7‰. δ-values of rainwater were more enriched during winter and more depleted during summer, due to the amount of rainfall and seasonal effect. The LMWL in Thohoyandou is defined by δD = 7.56δ18O + 10.64, which shows a similar slope to the global meteoric water line (GMWL) but with a slightly higher intercept, of 10.64‰ instead of 10‰. This implies that the process of rain formation in Thohoyandou occurred under equilibrium conditions which are not significantly affected by evaporation. The slightly higher d-intercept value above the GMWL reflects an additional supply of recycled moisture across the regions. This implies that there is no continental effect but inland moisture from various water bodies and vegetation.

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