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| Titel |
Quantifying molecular oxygen isotope variations during a Heinrich stadial |
| VerfasserIn |
C. Reutenauer, A. Landais, T. Blunier, C. Bréant, M. Kageyama, M.-N. Woillez, C. Risi, V. Mariotti, P. Braconnot |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 11 ; Nr. 11, no. 11 (2015-11-19), S.1527-1551 |
| Datensatznummer |
250117458
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| Publikation (Nr.) |
 copernicus.org/cp-11-1527-2015.pdf |
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| Zusammenfassung |
| δ18O of atmospheric oxygen
(δ18Oatm) undergoes millennial-scale variations
during the last glacial period, and systematically increases during Heinrich
stadials (HSs). Changes in δ18Oatm combine
variations in biospheric and water cycle processes. The identification of the
main driver of the millennial variability in
δ18Oatm is thus not straightforward. Here, we
quantify the response of δ18Oatm to such
millennial events using a freshwater hosing simulation performed
under glacial boundary conditions. Our global approach takes into account the
latest estimates of isotope fractionation factor for respiratory and
photosynthetic processes and make use of atmospheric water isotope and
vegetation changes. Our modeling approach allows to reproduce the main
observed features of a HS in terms of climatic conditions, vegetation
distribution and δ18O of precipitation. We use it to
decipher the relative importance of the different processes behind the
observed changes in δ18Oatm. The results highlight
the dominant role of hydrology on δ18Oatm and
confirm that δ18Oatm can be seen as a global
integrator of hydrological changes over vegetated areas. |
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