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dc.contributor.author
Piovano, Eduardo L.
dc.contributor.author
Ariztegui, Daniel
dc.contributor.author
Bernasconi, Stefano M.
dc.contributor.author
McKenzie, Judith A.
dc.date.accessioned
2022-08-26T11:02:23Z
dc.date.available
2022-08-26T10:58:18Z
dc.date.available
2022-08-26T11:02:23Z
dc.date.issued
2004-05-01
dc.identifier.issn
0959-6836
dc.identifier.issn
1477-0911
dc.identifier.other
10.1191/0959683604hl729rp
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/566761
dc.description.abstract
Laguna Mar Chiquita, a highly variable closed saline lake located in the Pampean plains of cetral Argentina, is presently the largest saline lake in South America ("-6000km2). The availability of hitorical, instrumental lake-level and salinity data for the past 100 years allows for the calibration of the isotopic archive recorded in the lake sediments. Prolonged intervals with either negative or positive hydrlogical balances have severely modified lakewater levels, salinity and primary productivity, and have also controlled the isotopic composition of both the authigenic carbonate (&8Ooarb and f133Ccarb) and sedimetary organic matter (6"C0,,). Extensive evaporation during lowstand stages results in an enrichment of 180 and 13C in the lake waters, and is recorded in the sediments as the most positive &8O8arb and 613C carb compositions (0.0%o and-1.9Yoo, respectively). Conversely, more negative 6f'8Ocarb and 813Ccarb values (-1.8%o and-3.8Yoo, respectively) are the result of increasing freshwater input into the lake system. The fi3Com values are related to the isotopic composition of the dissolved inorganic carbon pool and the cabonate equilibrium of the lake water. Relatively low 613COm values correspond with high lake levels, low salinity, low alkalinity and high lake productivity. High salinity during lowstands diminishes the amount of primary production and the 613Com value is correspondingly high. The calibrated isotopic model was extrapolated to reconstruct precipitation-evaporation variability from the end of the‘Little Ice Age’ (c. AD 1770) to the present. Low water levels predominated until the last quarter of the twentieth century, when a positive hydrological balance without equivalent in the previous history of Laguna Mar Chiquita became dominant.
en_US
dc.language.iso
en
en_US
dc.publisher
Sage
en_US
dc.subject
Stable isotopes
en_US
dc.subject
Saline lake
en_US
dc.subject
Palaeohydrology
en_US
dc.subject
'Little Ice Age'
en_US
dc.subject
Twentieth century
en_US
dc.subject
Central Argentina
en_US
dc.title
Stable isotopic record of hydrological changes in subtropical Laguna Mar Chiquita (Argentina) over the last 230 years
en_US
dc.type
Journal Article
ethz.journal.title
The Holocene
ethz.journal.volume
14
en_US
ethz.journal.issue
4
en_US
ethz.pages.start
525
en_US
ethz.pages.end
535
en_US
ethz.identifier.wos
ethz.publication.place
Los Angeles, CA
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03459 - McKenzie, Judith A.
en_US
ethz.leitzahl.certified
03459 - McKenzie, Judith A.
ethz.date.deposited
2017-06-10T01:11:38Z
ethz.source
ECIT
ethz.identifier.importid
imp593652f46528978392
ethz.identifier.importid
imp59364f42e3e0518121
ethz.ecitpid
pub:153889
ethz.ecitpid
pub:81554
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2022-08-26T10:58:27Z
ethz.rosetta.lastUpdated
2022-08-26T10:58:27Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/164282
dc.identifier.olduri
http://hdl.handle.net/20.500.11850/49679
ethz.COinS
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