Annual means of delta 18O time series Colle Gnifetti ice cores
Among Alpine ice core drilling sites, the Colle Gnifetti glacier saddle situated in the Monte Rosa summit range is the only one whose net snow accumulation rate is low enough to offer climate records back to some 1000 yr. It is demonstrated that the strong snow erosion at this site particularly hamp...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.874205 2023-05-15T16:39:23+02:00 Annual means of delta 18O time series Colle Gnifetti ice cores Bohleber, Pascal Wagenbach, Dietmar Schöner, Wolfgang Böhm, Reinhard MEDIAN LATITUDE: 45.928880 * MEDIAN LONGITUDE: 7.875452 * SOUTH-BOUND LATITUDE: 45.928190 * WEST-BOUND LONGITUDE: 7.873650 * NORTH-BOUND LATITUDE: 45.929720 * EAST-BOUND LONGITUDE: 7.876960 * DATE/TIME START: 2005-08-28T00:00:00 * DATE/TIME END: 2005-09-04T00:00:00 2013-03-31 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.874205 https://doi.org/10.1594/PANGAEA.874205 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.874205 https://doi.org/10.1594/PANGAEA.874205 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Bohleber, Pascal; Wagenbach, Dietmar; Schöner, Wolfgang; Böhm, Reinhard (2013): To what extent do water isotope records from low accumulation Alpine ice cores reproduce instrumental temperature series? Tellus Series B-Chemical and Physical Meteorology, 65(1), 20148, https://doi.org/10.3402/tellusb.v65i0.20148 Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.874205 https://doi.org/10.3402/tellusb.v65i0.20148 2023-01-20T07:33:55Z Among Alpine ice core drilling sites, the Colle Gnifetti glacier saddle situated in the Monte Rosa summit range is the only one whose net snow accumulation rate is low enough to offer climate records back to some 1000 yr. It is demonstrated that the strong snow erosion at this site particularly hampers the interpretation of stable water isotope records d18O, dD in terms of atmospheric temperature changes. We evaluate the d18O records from four Colle Gnifetti cores for their common variability to extract a composite isotope record that may be compared with the instrumental temperature evidence. Time series analyses over the last 120 yr reveal that the common d18O signal is mainly reflected in the low frequency variability, starting at the decadal scale. Comparing the correspondingly smoothed composite record to the high-elevation temperature time series (specifically adjusted to the seasonality of the net snow accumulation) reveals the following findings: On the decadal scale, the isotope variability correlates with the temperature record at around R=0.65 but is interrupted by three, ca. 10-yr long mismatch periods. The multidecadal isotope signal closely reflects the strong overall 20th century temperature increase, thereby showing an up to three-fold higher isotope temperature sensitivity than commonly assumed. Over the entire instrumental period back to 1760, five more such mismatch periods are embedded in the generally coherent pattern of the d18O and instrumental temperature records (including the strong overestimate of the temperature around 1850 by the isotope temperature proxy). For the early instrumental period (1890-1760) characterized by a comparably weak long-term temperature trend, the isotope signal generally suggests warmer conditions of about 0.4°C compared to instrumental data. Dataset ice core PANGAEA - Data Publisher for Earth & Environmental Science Monte Rosa ENVELOPE(162.850,162.850,-70.917,-70.917) ENVELOPE(7.873650,7.876960,45.929720,45.928190) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Among Alpine ice core drilling sites, the Colle Gnifetti glacier saddle situated in the Monte Rosa summit range is the only one whose net snow accumulation rate is low enough to offer climate records back to some 1000 yr. It is demonstrated that the strong snow erosion at this site particularly hampers the interpretation of stable water isotope records d18O, dD in terms of atmospheric temperature changes. We evaluate the d18O records from four Colle Gnifetti cores for their common variability to extract a composite isotope record that may be compared with the instrumental temperature evidence. Time series analyses over the last 120 yr reveal that the common d18O signal is mainly reflected in the low frequency variability, starting at the decadal scale. Comparing the correspondingly smoothed composite record to the high-elevation temperature time series (specifically adjusted to the seasonality of the net snow accumulation) reveals the following findings: On the decadal scale, the isotope variability correlates with the temperature record at around R=0.65 but is interrupted by three, ca. 10-yr long mismatch periods. The multidecadal isotope signal closely reflects the strong overall 20th century temperature increase, thereby showing an up to three-fold higher isotope temperature sensitivity than commonly assumed. Over the entire instrumental period back to 1760, five more such mismatch periods are embedded in the generally coherent pattern of the d18O and instrumental temperature records (including the strong overestimate of the temperature around 1850 by the isotope temperature proxy). For the early instrumental period (1890-1760) characterized by a comparably weak long-term temperature trend, the isotope signal generally suggests warmer conditions of about 0.4°C compared to instrumental data. |
format |
Dataset |
author |
Bohleber, Pascal Wagenbach, Dietmar Schöner, Wolfgang Böhm, Reinhard |
spellingShingle |
Bohleber, Pascal Wagenbach, Dietmar Schöner, Wolfgang Böhm, Reinhard Annual means of delta 18O time series Colle Gnifetti ice cores |
author_facet |
Bohleber, Pascal Wagenbach, Dietmar Schöner, Wolfgang Böhm, Reinhard |
author_sort |
Bohleber, Pascal |
title |
Annual means of delta 18O time series Colle Gnifetti ice cores |
title_short |
Annual means of delta 18O time series Colle Gnifetti ice cores |
title_full |
Annual means of delta 18O time series Colle Gnifetti ice cores |
title_fullStr |
Annual means of delta 18O time series Colle Gnifetti ice cores |
title_full_unstemmed |
Annual means of delta 18O time series Colle Gnifetti ice cores |
title_sort |
annual means of delta 18o time series colle gnifetti ice cores |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.874205 https://doi.org/10.1594/PANGAEA.874205 |
op_coverage |
MEDIAN LATITUDE: 45.928880 * MEDIAN LONGITUDE: 7.875452 * SOUTH-BOUND LATITUDE: 45.928190 * WEST-BOUND LONGITUDE: 7.873650 * NORTH-BOUND LATITUDE: 45.929720 * EAST-BOUND LONGITUDE: 7.876960 * DATE/TIME START: 2005-08-28T00:00:00 * DATE/TIME END: 2005-09-04T00:00:00 |
long_lat |
ENVELOPE(162.850,162.850,-70.917,-70.917) ENVELOPE(7.873650,7.876960,45.929720,45.928190) |
geographic |
Monte Rosa |
geographic_facet |
Monte Rosa |
genre |
ice core |
genre_facet |
ice core |
op_source |
Supplement to: Bohleber, Pascal; Wagenbach, Dietmar; Schöner, Wolfgang; Böhm, Reinhard (2013): To what extent do water isotope records from low accumulation Alpine ice cores reproduce instrumental temperature series? Tellus Series B-Chemical and Physical Meteorology, 65(1), 20148, https://doi.org/10.3402/tellusb.v65i0.20148 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.874205 https://doi.org/10.1594/PANGAEA.874205 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.874205 https://doi.org/10.3402/tellusb.v65i0.20148 |
_version_ |
1766029726092099584 |