DOI: 10.1016/j.quascirev.2013.01.009
Scopus记录号: 2-s2.0-84874721108
论文题名: Warm climate isotopic simulations: What do we learn about interglacial signals in Greenland ice cores?
作者: Sime L.C. ; Risi C. ; Tindall J.C. ; Sjolte J. ; Wolff E.W. ; Masson-Delmotte V. ; Capron E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 67 起始页码: 59
结束页码: 80
语种: 英语
英文关键词: Atmospheric modelling
; Greenland
; Ice cores
; Interglacials
; Stable water isotopes
Scopus关键词: Atmospheric modelling
; Greenland
; Ice core
; Interglacials
; Stable water isotopes
; Atmospheric temperature
; Greenhouse gases
; Lasers
; Sea ice
; Snow
; Thermal gradients
; Isotopes
; atmospheric modeling
; ice core
; interglacial
; Last Interglacial
; paleoclimate
; precipitation (climatology)
; sea ice
; sea surface temperature
; stable isotope
; Arctic
; Greenland
英文摘要: Measurements of Last Interglacial stable water isotopes in ice cores show that central Greenland δ18O increased by at least 3‰ compared to present day. Attempting to quantify the Greenland interglacial temperature change from these ice core measurements rests on our ability to interpret the stable water isotope content of Greenland snow. Current orbitally driven interglacial simulations do not show δ18O or temperature rises of the correct magnitude, leading to difficulty in using only these experiments to inform our understanding of higher interglacial δ18O. Here, analysis of greenhouse gas warmed simulations from two isotope-enabled general circulation models, in conjunction with a set of Last Interglacial sea surface observations, indicates a possible explanation for the interglacial δ18O rise. A reduction in the winter time sea ice concentration around the northern half of Greenland, together with an increase in sea surface temperatures over the same region, is found to be sufficient to drive a >3‰ interglacial enrichment in central Greenland snow. Warm climate δ18O and δD in precipitation falling on Greenland are shown to be strongly influenced by local sea surface condition changes: local sea surface warming and a shrunken sea ice extent increase the proportion of water vapour from local (isotopically enriched) sources, compared to that from distal (isotopically depleted) sources. Precipitation intermittency changes, under warmer conditions, leads to geographical variability in the δ18O against temperature gradients across Greenland. Little sea surface warming around the northern areas of Greenland leads to low δ18O against temperature gradients (0.1-0.3‰ per °C), whilst large sea surface warmings in these regions leads to higher gradients (0.3-0.7‰ per °C). These gradients imply a wide possible range of present day to interglacial temperature increases (4 to >10 °C). Thus, we find that uncertainty about local interglacial sea surface conditions, rather than precipitation intermittency changes, may lead to the largest uncertainties in interpreting temperature from Greenland ice cores. We find that interglacial sea surface change observational records are currently insufficient to enable discrimination between these different δ18O against temperature gradients. In conclusion, further information on interglacial sea surface temperatures and sea ice changes around northern Greenland should indicate whether +5 °C during the Last Interglacial is sufficient to drive the observed ice core δ18O increase, or whether a larger temperature increases or ice sheet changes are also required to explain the ice core observations. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60677
Appears in Collections: 过去全球变化的重建
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作者单位: British Antarctic Survey, Ice Cores, Cambridge CB3 0ET, United Kingdom; Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, United States; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, United Kingdom; Niels Bohr Institute, Centre for Ice and Climate, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark; Laboratoire des Sciences du Climat et de l'Environnement, UMR 8212 CEA-CNRS-UVSQ, Gif-sur-Yvette, France; Laboratoire de Météorologie Dynamique, IPSL/CNRS/UPMC, Paris, France; GeoBiosphere Science Centre, Quaternary Sciences, Lund University, Slvegatan 12, SE-223 62 Lund, Sweden
Recommended Citation:
Sime L.C.,Risi C.,Tindall J.C.,et al. Warm climate isotopic simulations: What do we learn about interglacial signals in Greenland ice cores?[J]. Quaternary Science Reviews,2013-01-01,67