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Paleohydrological history of Lake Allos (2200 m a.s.l) since 13 500 cal a bp in the Mediterranean Alps inferred from an ostracod δ18O record

Cartier, Rosine LU ; Vidal, Laurence ; Sylvestre, Florence ; Sonzogni, Corinne ; Guiter, Frédéric ; Brisset, Elodie and Miramont, Cécile (2022) In Journal of Quaternary Science
Abstract

This paper presents the first Lateglacial/Holocene (the last 13 500 cal a bp) ostracod δ18O record to infer hydroclimate variability in the Southern French Alps. Cytherissa lacustris (δ18Osp) shells extracted from the sediments of Lake Allos allowed a reconstruction of δ18Olake water18Olw) except for the interval 5800–2800 cal a bp. The shape of the Younger Dryas (YD) clearly differed from records documented in the northern Alps. First, δ18Olw values remained close to modern values before a marked drop ca. 12 000 cal a bp. Then, after several oscillations, δ18Olw values increased, reaching the highest value of the... (More)

This paper presents the first Lateglacial/Holocene (the last 13 500 cal a bp) ostracod δ18O record to infer hydroclimate variability in the Southern French Alps. Cytherissa lacustris (δ18Osp) shells extracted from the sediments of Lake Allos allowed a reconstruction of δ18Olake water18Olw) except for the interval 5800–2800 cal a bp. The shape of the Younger Dryas (YD) clearly differed from records documented in the northern Alps. First, δ18Olw values remained close to modern values before a marked drop ca. 12 000 cal a bp. Then, after several oscillations, δ18Olw values increased, reaching the highest value of the record ca. 6100 cal a bp during a thermal optimum for this latitude. Finally, low δ18Olw values occurred from 450 to 100 cal a bp during the Little Ice Age (LIA) following the Medieval Climate anomaly. At the beginning of the YD, δ18Olw probably reflected changes in local glacier dynamics and precipitation sources. The following decrease in δ18Olw values was associated with higher freshwater inputs during the second half of the YD. During the LIA, the low δ18O values are consistent with a higher torrential activity and lower air temperatures.

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organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Lateglacial/Holocene, Mediterranean Alps, ostracods, oxygen isotopes, paleohydrology
in
Journal of Quaternary Science
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85128198071
ISSN
0267-8179
DOI
10.1002/jqs.3425
language
English
LU publication?
yes
id
7e72e430-04fc-4490-b1a3-c969852a8931
date added to LUP
2022-07-05 13:26:57
date last changed
2022-07-05 13:26:57
@article{7e72e430-04fc-4490-b1a3-c969852a8931,
  abstract     = {{<p>This paper presents the first Lateglacial/Holocene (the last 13 500 cal a bp) ostracod δ<sup>18</sup>O record to infer hydroclimate variability in the Southern French Alps. Cytherissa lacustris (δ<sup>18</sup>O<sub>sp</sub>) shells extracted from the sediments of Lake Allos allowed a reconstruction of δ<sup>18</sup>O<sub>lake water</sub> (δ<sup>18</sup>O<sub>lw</sub>) except for the interval 5800–2800 cal a bp. The shape of the Younger Dryas (YD) clearly differed from records documented in the northern Alps. First, δ<sup>18</sup>O<sub>lw</sub> values remained close to modern values before a marked drop ca. 12 000 cal a bp. Then, after several oscillations, δ<sup>18</sup>O<sub>lw</sub> values increased, reaching the highest value of the record ca. 6100 cal a bp during a thermal optimum for this latitude. Finally, low δ<sup>18</sup>O<sub>lw</sub> values occurred from 450 to 100 cal a bp during the Little Ice Age (LIA) following the Medieval Climate anomaly. At the beginning of the YD, δ<sup>18</sup>O<sub>lw</sub> probably reflected changes in local glacier dynamics and precipitation sources. The following decrease in δ<sup>18</sup>O<sub>lw</sub> values was associated with higher freshwater inputs during the second half of the YD. During the LIA, the low δ<sup>18</sup>O values are consistent with a higher torrential activity and lower air temperatures.</p>}},
  author       = {{Cartier, Rosine and Vidal, Laurence and Sylvestre, Florence and Sonzogni, Corinne and Guiter, Frédéric and Brisset, Elodie and Miramont, Cécile}},
  issn         = {{0267-8179}},
  keywords     = {{Lateglacial/Holocene; Mediterranean Alps; ostracods; oxygen isotopes; paleohydrology}},
  language     = {{eng}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Journal of Quaternary Science}},
  title        = {{Paleohydrological history of Lake Allos (2200 m a.s.l) since 13 500 cal a bp in the Mediterranean Alps inferred from an ostracod δ<sup>18</sup>O record}},
  url          = {{http://dx.doi.org/10.1002/jqs.3425}},
  doi          = {{10.1002/jqs.3425}},
  year         = {{2022}},
}