globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2017.12.035
Scopus记录号: 2-s2.0-85044589232
论文题名:
Impact of topography, climate and moisture sources on isotopic composition (δ18O & δD) of rivers in the Pyrenees: Implications for topographic reconstructions in small orogens
作者: Huyghe D.; Mouthereau F.; Sébilo M.; Vacherat A.; Ségalen L.; Richard P.; Biron P.; Bariac T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484
起始页码: 370
结束页码: 384
语种: 英语
英文关键词: climate ; meteoric water ; orographic effect ; paleoaltimetry ; stable isotopes ; western Europe
Scopus关键词: Atmospheric movements ; Catchments ; Moisture ; Rain ; Repair ; Rivers ; Topography ; climate ; Meteoric waters ; Orographic effects ; Paleoaltimetry ; Stable isotopes ; Western Europe ; Isotopes ; altimetry ; climate effect ; deuterium ; isotopic composition ; meteoric water ; moisture content ; orographic effect ; oxygen isotope ; precipitation quality ; river water ; stable isotope ; topographic effect ; Pyrenees ; Western Europe
英文摘要: Understanding how orogenic topography controls the spatial distribution and isotopic composition of precipitation is critical for paleoaltitudinal reconstructions. Here, we determine the isotopic composition (δ18O and δD) of 82 small rivers and springs from small catchments in the Pyrenees. Calculation of the deuterium excess (d-excess) parameter allows the distinction of four distinct isotopic provinces with d-excess values of between 15 and 22‰ in the northwest, between 7 and 14‰ in the central northern Pyrenees and between 3 and 11‰ in the northeast. The southern Pyrenees have a homogenous d-excess signature ranging from 7 to 14‰. Our results show significant local moisture recycling and/or rain amount effect in the northwestern Pyrenees, and control by evaporation processes during rainfall events in the southern Pyrenees and for low elevated samples of the northeast of the range. Based on the distribution of d-excess values, we estimate contrasting isotope lapse rates of −2.9/−21.4‰/km (δ18O/δD) in the northwest, −2.7/−21.4‰/km (δ18O/δD) in the north central and −3.7/−31.7‰/km (δ18O/δD) in the northeastern Pyrenees. The southern Pyrenees show distinctly higher lapse rates of −9.5/−77.5‰/km (δ18O/δD), indicating that in this area the altitudinal effect in not the only parameter driving isotopic composition of rivers. Despite their relatively low topographic gradient, the Pyrenees exert a direct control on the isotopic composition of river waters, especially on their northern side. The variations in isotopic composition–elevation relationships documented along the strike of the range are interpreted to reflect an increasing continentality effect driven by wind trajectories parallel to the range, and mixing with Mediterranean air masses. Despite these effects, the measurable orographic effect on precipitation in the Pyrenees proves that the isotopic composition approach for reconstructing past topography is applicable to low-elevation orogens. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110047
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Géosciences Environnement Toulouse (GET), Université Paul Sabatier Toulouse 3, 14 Avenue Edouard Belin, Toulouse, 31400, France; Sorbonne Universités, UPMC-Paris 06, UMR 8222, Lab. Ecogéochimie des environnements benthiques (LECOB), Observatoire Océanologique, Banyuls-sur-mer, F-66650, France; Sorbonne Université UPMC Université Paris 06, Institut d'Ecologie et des Sciences de l'Environnement de Paris (IEES Paris), CNRS, Campus INRA, AgroParisTech, Bâtiment EGER, Thiverval-Grignon, 78550, France; Sorbonne Universités, UPMC-Paris 06, UMR CNRS 7193, ISTeP, Paris, F-75005, France

Recommended Citation:
Huyghe D.,Mouthereau F.,Sébilo M.,et al. Impact of topography, climate and moisture sources on isotopic composition (δ18O & δD) of rivers in the Pyrenees: Implications for topographic reconstructions in small orogens[J]. Earth and Planetary Science Letters,2018-01-01,484
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