Show simple item record

dc.contributor.author
Mariani, Isabella
dc.contributor.author
Eichler, Anja
dc.contributor.author
Jenk, Theo M.
dc.contributor.author
Brönnimann, Stefan
dc.contributor.author
Auchmann, Renate
dc.contributor.author
Leuenberger, Markus C.
dc.contributor.author
Schwikowski, Margit
dc.date.accessioned
2019-06-27T07:28:47Z
dc.date.available
2017-06-11T11:22:20Z
dc.date.available
2019-06-27T07:28:47Z
dc.date.issued
2014
dc.identifier.issn
1814-9324
dc.identifier.issn
1814-9332
dc.identifier.other
10.5194/cp-10-1093-2014
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/87121
dc.identifier.doi
10.3929/ethz-b-000087121
dc.description.abstract
Water stable isotope ratios and net snow accumulation in ice cores are commonly interpreted as temperature or precipitation proxies. However, only in a few cases has a direct calibration with instrumental data been attempted. In this study we took advantage of the dense network of observations in the European Alpine region to rigorously test the relationship of the annual and seasonal resolved proxy data from two highly resolved ice cores with local temperature and precipitation. We focused on the time period 1961–2001 with the highest amount and quality of meteorological data and the minimal uncertainty in ice core dating (±1 year). The two ice cores were retrieved from the Fiescherhorn glacier (northern Alps, 3900 m a.s.l.), and Grenzgletscher (southern Alps, 4200 m a.s.l.). A parallel core from the Fiescherhorn glacier allowed assessing the reproducibility of the ice core proxy data. Due to the orographic barrier, the two flanks of the Alpine chain are affected by distinct patterns of precipitation. The different location of the two glaciers therefore offers a unique opportunity to test whether such a specific setting is reflected in the proxy data. On a seasonal scale a high fraction of δ18O variability was explained by the seasonal cycle of temperature (~60% for the ice cores, ~70% for the nearby stations of the Global Network of Isotopes in Precipitation – GNIP). When the seasonality is removed, the correlations decrease for all sites, indicating that factors other than temperature such as changing moisture sources and/or precipitation regimes affect the isotopic signal on this timescale. Post-depositional phenomena may additionally modify the ice core data. On an annual scale, the δ18O/temperature relationship was significant at the Fiescherhorn, whereas for Grenzgletscher this was the case only when weighting the temperature with precipitation. In both cases the fraction of interannual temperature variability explained was ~20%, comparable to the values obtained from the GNIP stations data. Consistently with previous studies, we found an altitude effect for the δ18O of −0.17‰/100 m for an extended elevation range combining data of the two ice core sites and four GNIP stations. Significant correlations between net accumulation and precipitation were observed for Grenzgletscher during the entire period of investigation, whereas for Fiescherhorn this was the case only for the less recent period (1961–1977). Local phenomena, probably related to wind, seem to partly disturb the Fiescherhorn accumulation record. Spatial correlation analysis shows the two glaciers to be influenced by different precipitation regimes, with the Grenzgletscher reflecting the characteristic precipitation regime south of the Alps and the Fiescherhorn accumulation showing a pattern more closely linked to northern Alpine stations.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Temperature and precipitation signal in two Alpine ice cores over the period 1961-2001
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
dc.date.published
2014-06-04
ethz.journal.title
Climate of the Past
ethz.journal.volume
10
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Clim. past
ethz.pages.start
1093
en_US
ethz.pages.end
1108
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.nebis
005583758
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T11:24:03Z
ethz.source
ECIT
ethz.identifier.importid
imp593652217e81942841
ethz.ecitpid
pub:137182
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-20T15:50:27Z
ethz.rosetta.lastUpdated
2019-06-27T07:28:57Z
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.atitle=Temperature%20and%20precipitation%20signal%20in%20two%20Alpine%20ice%20cores%20over%20the%20period%201961-2001&rft.jtitle=Climate%20of%20the%20Past&rft.date=2014&rft.volume=10&rft.issue=3&rft.spage=1093&rft.epage=1108&rft.issn=1814-9324&1814-9332&rft.au=Mariani,%20Isabella&Eichler,%20Anja&Jenk,%20Theo%20M.&Br%C3%B6nnimann,%20Stefan&Auchmann,%20Renate&rft.genre=article&
 Search via SFX

Files in this item

Thumbnail

Publication type

Show simple item record