DOI: 10.5194/hess-21-5357-2017
Scopus记录号: 2-s2.0-85032467480
论文题名: Transfer of environmental signals from the surface to the underground at Ascunsa Cave, Romania
作者: Dragusin V ; , Balan S ; , Blamart D ; , Lázár Forray F ; , Marin C ; , Mirea I ; , Nagavciuc V ; , Oraseanu I ; , Peraoiu A ; , Tia L ; , Tudorache A ; , Vlaicu M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 10 起始页码: 5357
结束页码: 5373
语种: 英语
Scopus关键词: Carbon dioxide
; Caves
; Infrared radiation
; Isotopes
; Monitoring
; Rain
; Chemical determination
; Climate information
; Environmental Monitoring
; Environmental signals
; Infrared technology
; Meteoric water lines
; Seasonal differences
; Surface temperatures
; Reservoirs (water)
; air temperature
; carbon dioxide
; cave
; climate conditions
; concentration (composition)
; design method
; deuterium
; environmental monitoring
; karst
; meteoric water
; moisture
; organic matter
; physicochemical property
; precipitation (climatology)
; signal
; stable isotope
; surface temperature
; water vapor
; Romania
英文摘要: We present here the results of a 4-year environmental monitoring program at Ascunsa Cave (southwestern Romania) designed to help us understand how climate information is transferred through the karst system and archived by speleothems. The air temperature inside the cave is around 7g°C, with slight differences between the upper and lower parts of the main passage. CO2 concentrations in cave air have a seasonal signal, with summer minima and winter maxima. These might indicate the existence of an organic matter reservoir deep within the epikarst that continues to decompose over the winter, and CO2 concentrations are possibly modulated by seasonal differences in cave ventilation. The maximum values of CO2 show a rise after the summer of 2014, from around 2000 to about 3500gppm, following a rise in surface temperature. Using two newly designed types of water-air equilibrators, we were able to determine the concentration of CO2 dissolved in drip water by measuring its concentration in the equilibrator headspace and then using Henry's law to calculate its concentration in water. This method opens the possibility of continuous data logging using infrared technology, without the need for costly and less reliable chemical determinations. The local meteoric water line (/2Hg Combining double low line g7.7/18Og+g10.1), constructed using monthly aggregated rainfall samples, is similar to the global one, revealing the Atlantic as the strongly dominant vapor source. The deuterium excess values, as high as 17g, indicate that precipitation has an important evaporative component, possibly given by moisture recycling over the European continent. The variability of stable isotopes in drip water is similar at all points inside the cave, suggesting that the monitored drip sites are draining a homogenous reservoir. Drip rates, as well as stable isotopes, indicate that the transfer time of water from the surface is on the order of a few days. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79017
Appears in Collections: 气候变化事实与影响
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作者单位: Emil Racovia Institute of Speleology, Frumoasa 31, Romania; National Research and Development Institute for Marine Geology and Geoecology, Mamaia 304, Constana, Romania; Laboratoire des Sciences du Climat et de l'Environnement LSCE-IPSL CEA-CNRS-UVSQ, Paris-Saclay, Avenue de la Terrasse, Bât. 12, Gif-sur-Yvette Cedex, France; Department of Geology, Babea-Bolyai University, Kogalniceanu 1, Cluj-Napoca, Romania; Stable Isotope Laboratory, Stefan Cel Mare University, Universitaii 13, Suceava, Romania; Romanian Association of Hydrogeologists, Traian Vuia 6, Bucharest, Romania; Emil Racovia Institute of Speleology, Clinicilor 5, Cluj Napoca, Romania; Faculty of Geography, University of Bucharest, N. Balcescu 1, Romania
Recommended Citation:
Dragusin V,, Balan S,, Blamart D,et al. Transfer of environmental signals from the surface to the underground at Ascunsa Cave, Romania[J]. Hydrology and Earth System Sciences,2017-01-01,21(10)