Stable Isotope Studies of the Water Cycle and Terrestrial Environments

This volume is devoted to Earth surface environmental reconstructions and environmental changes that may be deciphered and modelled using stable isotopes along with mineralogical/chemical, sedimentological, palaeontological/biological and climatological methodologies. The book is divided into two sections, both using stable isotopes (δD, δ18O, δ13C, d15N, δ34S, clumped isotopes Δ47) in various samples and phases as the main research tool. The first section is devoted to studies focusing on the distribution of isotopes in precipitation, groundwater, lakes, rivers, springs, tap water, mine water and their relationship with terrestrial environments at regional to continental scale. In relation to this, the second section includes case studies from a range of continental settings, investigating cave deposits (stalagmites, bat guano), animal skeletons (dinosaurs, alligators, turtles, bivalves), present and past soils (palaeosols) and limestones. The sections focus on the interaction between the surficial water cycle and underground water storage with deposits acting as archives of short- to long-term climatic and environmental changes. Examples from the Early Cretaceous to present time come from Europe, Asia, Africa, North and South America.
Time series analysis of the δ2H, δ18O and dexcess values in correlation with monthly temperature, relative humidity and precipitation in Râmnicu Vâlcea, Romania: 2012–2018
Correspondence: [email protected]
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Published:October 28, 2021
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CiteCitation
Carmen Varlam, Octavian G. Duliu, Roxana Elena Ionete, Diana Costinel, 2021. "Time series analysis of the δ2H, δ18O and dexcess values in correlation with monthly temperature, relative humidity and precipitation in Râmnicu Vâlcea, Romania: 2012–2018", Stable Isotope Studies of the Water Cycle and Terrestrial Environments, A.-V. Bojar, A. Pelc, C. Lécuyer
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Abstract
To investigate the influence of local climate and transboundary circulation of moisture on the stable isotope of precipitation in Ramnicu Valcea, Romania, monthly values of δ2H, δ18O, deuterium excess (dexcess), temperature, relative humidity and precipitation were determined between January 2012 and December 2018. Monthly analysis showed differences in dexcess varying between 24.2‰ (October 2015) and −23.7‰ (July 2013) with a multi-annual average of 6.1 ± 5.9‰, suggesting an Atlantic origin of moisture with episodic Mediterranean transport. Also a significant correlation between the North Atlantic Oscillation on the local temperature during winter season was noticed. The local meteoric water line (LMWL) for the entire period showed slope and intercept values similar to those for neighbouring localities with the same altitude. When the analysis was extended to summer (April–October) and winter (November–March) seasons, the LMWL slope and intercept were different, reflecting the summer–winter difference in temperatures and air circulation. The monthly values of all parameters formed equal-spaced time series whose detailed analysis confirmed at p <0.01 that δ2H, δ18O, temperature and relative humidity show a well-evidenced one-year periodicity. In contrast, precipitation and dexcess seasonality were almost unrecognizable, most probably owing to the reduced number of observations.
- atmospheric circulation
- atmospheric precipitation
- climate
- correlation
- D/H
- deuterium
- environmental analysis
- Europe
- humidity
- hydrogen
- isotope ratios
- isotopes
- Mediterranean Sea
- meteoric water
- moisture
- monthly variations
- North Atlantic Oscillation
- O-18/O-16
- oxygen
- Romania
- sampling
- seasonal variations
- Southern Europe
- stable isotopes
- statistical analysis
- temperature
- time series analysis
- Ramnicu Valcea Romania