DOI: 10.5194/cp-12-1933-2016
Scopus记录号: 2-s2.0-84989858370
论文题名: How warm was Greenland during the last interglacial period?
作者: Landais A. ; Masson-Delmotte V. ; Capron E. ; Langebroek P.M. ; Bakker P. ; Stone E.J. ; Merz N. ; Raible C.C. ; Fischer H. ; Orsi A. ; Prié F. ; Vinther B. ; Dahl-Jensen D.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2016
卷: 12, 期: 9 起始页码: 1933
结束页码: 1948
语种: 英语
英文摘要: The last interglacial period (LIG, ∼ 129-116 thousand years ago) provides the most recent case study of multimillennial polar warming above the preindustrial level and a response of the Greenland and Antarctic ice sheets to this warming, as well as a test bed for climate and ice sheet models. Past changes in Greenland ice sheet thickness and surface temperature during this period were recently derived from the North Greenland Eemian Ice Drilling (NEEM) ice core records, northwest Greenland. The NEEM paradox has emerged from an estimated large local warming above the preindustrial level (7.5 ± 1.8 °C at the deposition site 126 kyr ago without correction for any overall ice sheet altitude changes between the LIG and the preindustrial period) based on water isotopes, together with limited local ice thinning, suggesting more resilience of the real Greenland ice sheet than shown in some ice sheet models. Here, we provide an independent assessment of the average LIG Greenland surface warming using ice core air isotopic composition (δ15N) and relationships between accumulation rate and temperature. The LIG surface temperature at the upstream NEEM deposition site without ice sheet altitude correction is estimated to be warmer by +8.5 ± 2.5 °C compared to the preindustrial period. This temperature estimate is consistent with the 7.5 ± 1.8 °C warming initially determined from NEEM water isotopes but at the upper end of the preindustrial period to LIG temperature difference of +5.2 ± 2.3 °C obtained at the NGRIP (North Greenland Ice Core Project) site by the same method. Climate simulations performed with present-day ice sheet topography lead in general to a warming smaller than reconstructed, but sensitivity tests show that larger amplitudes (up to 5 °C) are produced in response to prescribed changes in sea ice extent and ice sheet topography. © Author(s) 2016.
资助项目: ERC, European Research Council
; ERC, European Research Council
; ANR, Agence Nationale de la Recherche
; ANR, Agence Nationale de la Recherche
; University of Bristol
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48970
Appears in Collections: 气候变化与战略
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Recommended Citation:
Landais A.,Masson-Delmotte V.,Capron E.,et al. How warm was Greenland during the last interglacial period?[J]. Climate of the Past,2016-01-01,12(9)