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Sökning: onr:"swepub:oai:DiVA.org:su-207977" > Investigating stabl...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00006192naa a2200481 4500
001oai:DiVA.org:su-207977
003SwePub
008220817s2022 | |||||||||||000 ||eng|
009oai:lup.lub.lu.se:7f98f4c7-6216-43a4-9d47-5a25dfbf6f0d
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2079772 URI
0247 a https://doi.org/10.5194/cp-18-1625-20222 DOI
0247 a https://lup.lub.lu.se/record/7f98f4c7-6216-43a4-9d47-5a25dfbf6f0d2 URI
040 a (SwePub)sud (SwePub)lu
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Bühler, Janica C.u Heidelberg University4 aut
2451 0a Investigating stable oxygen and carbon isotopic variability in speleothem records over the last millennium using multiple isotope-enabled climate models
264 c 2022-07-13
264 1b Copernicus GmbH,c 2022
338 a print2 rdacarrier
520 a The incorporation of water isotopologues into the hydrology of general circulation models (GCMs) facilitates the comparison between modeled and measured proxy data in paleoclimate archives. However, the variability and drivers of measured and modeled water isotopologues, as well as the diversity of their representation in different models, are not well constrained. Improving our understanding of this variability in past and present climates will help to better constrain future climate change projections and decrease their range of uncertainty. Speleothems are a precisely datable terrestrial paleoclimate archives and provide well-preserved (semi-)continuous multivariate isotope time series in the lower latitudes and mid-latitudes and are therefore well suited to assess climate and isotope variability on decadal and longer timescales. However, the relationships of speleothem oxygen and carbon isotopes to climate variables are influenced by site-specific parameters, and their comparison to GCMs is not always straightforward.Here we compare speleothem oxygen and carbon isotopic signatures from the Speleothem Isotopes Synthesis and Analysis database version 2 (SISALv2) to the output of five different water-isotope-enabled GCMs (ECHAM5-wiso, GISS-E2-R, iCESM, iHadCM3, and isoGSM) over the last millennium (850–1850 CE). We systematically evaluate differences and commonalities between the standardized model simulation outputs. The goal is to distinguish climatic drivers of variability for modeled isotopes and compare them to those of measured isotopes.We find strong regional differences in the oxygen isotope signatures between models that can partly be attributed to differences in modeled surface temperature. At low latitudes, precipitation amount is the dominant driver for stable water isotope variability; however, at cave locations the agreement between modeled temperature variability is higher than for precipitation variability. While modeled isotopic signatures at cave locations exhibited extreme events coinciding with changes in volcanic and solar forcing, such fingerprints are not apparent in the speleothem isotopes. This may be attributed to the lower temporal resolution of speleothem records compared to the events that are to be detected. Using spectral analysis, we can show that all models underestimate decadal and longer variability compared to speleothems (albeit to varying extents).We found that no model excels in all analyzed comparisons, although some perform better than the others in either mean or variability. Therefore, we advise a multi-model approach whenever comparing proxy data to modeled data. Considering karst and cave internal processes, e.g., through isotope-enabled karst models, may alter the variability in speleothem isotopes and play an important role in determining the most appropriate model. By exploring new ways of analyzing the relationship between the oxygen and carbon isotopes, their variability, and co-variability across timescales, we provide methods that may serve as a baseline for future studies with different models using, e.g., different isotopes, different climate archives, or different time periods.
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskap0 (SwePub)1052 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciences0 (SwePub)1052 hsv//eng
650 7a NATURVETENSKAPx Geovetenskap och miljövetenskapx Klimatforskning0 (SwePub)105012 hsv//swe
650 7a NATURAL SCIENCESx Earth and Related Environmental Sciencesx Climate Research0 (SwePub)105012 hsv//eng
7001 a Axelsson, Josefineu Stockholm University,Stockholms universitet,Institutionen för naturgeografi4 aut0 (Swepub:su)joax1573
7001 a Lechleitner, Franziska A.u University of Bern4 aut
7001 a Fohlmeister, Jensu GFZ German Research Centre for Geosciences,Federal Office for Radiation Protection4 aut
7001 a LeGrande, Allegra N.u Center for Climate Systems Research4 aut
7001 a Midhun, Madhavanu University of California, Santa Barbara4 aut
7001 a Sjolte, Jesperu Lund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Kvartärgeologi,Geologiska institutionen,Centre for Environmental and Climate Science (CEC),Faculty of Science,Quaternary Sciences,Department of Geology4 aut0 (Swepub:lu)geol-jes
7001 a Werner, Martinu Alfred-Wegener Institute, Helmholtz Center for Polar and Marine Research, Bremerhaven4 aut
7001 a Yoshimura, Keiu University of Tokyo4 aut
7001 a Rehfeld, Kirau Heidelberg University4 aut
7102 a Heidelberg Universityb Institutionen för naturgeografi4 org
7730 t Climate of the Pastd : Copernicus GmbHg 18:7, s. 1625-1654q 18:7<1625-1654x 1814-9324x 1814-9332
8564 u https://doi.org/10.5194/cp-18-1625-2022y Fulltext
8564 u http://dx.doi.org/10.5194/cp-18-1625-2022x freey FULLTEXT
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-207977
8564 8u https://doi.org/10.5194/cp-18-1625-2022
8564 8u https://lup.lub.lu.se/record/7f98f4c7-6216-43a4-9d47-5a25dfbf6f0d

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