The effect of a Holocene climatic optimum on the evolution of the Greenland ice sheet during the last 10 kyr
The effect of a Holocene climatic optimum on the evolution of the Greenland ice sheet during the last 10 kyr
复制标题
过去10年间全新世气候最适期对格陵兰冰盖演化的影响
作者：
L. T. Nielsen;G. Aðalgeirsdóttir;V. Gkinis;R. Nuterman;C. Hvidberg
全新世气候最佳时期是8-5 kyr前，格陵兰的年平均地表温度比现在高2-3°C。然而，这种变暖对常用的温度代用指标几乎没有留下任何印记，这些代用指标通常用于推导格陵兰冰盖过去演变模拟的气候强迫。在这项研究中，我们调查了格陵兰冰盖的演变，通过全新世时，被迫从冰芯记录不同的代理派生的温度历史，专注于持续较高的表面温度在全新世早期的影响。我们发现，冰盖退缩到一个最小的体积~0.15-1.2米的海平面相当于小于目前在全新世早期或中期时，迫使冰盖模型与温度重建，包含一个气候最佳，冰盖已继续恢复从这个最小到今天。在全新世早期没有温暖的气候最佳条件的重建导致较小的冰损失持续整个过去10 kyr。对于所有模拟的冰盖历史，冰盖在世纪末接近稳定状态。
ABSTRACT The Holocene climatic optimum was a period 8–5 kyr ago when annual mean surface temperatures in Greenland were 2–3°C warmer than present-day values. However, this warming left little imprint on commonly used temperature proxies often used to derive the climate forcing for simulations of the past evolution of the Greenland ice sheet. In this study, we investigate the evolution of the Greenland ice sheet through the Holocene when forced by different proxy-derived temperature histories from ice core records, focusing on the effect of sustained higher surface temperatures during the early Holocene. We find that the ice sheet retreats to a minimum volume of ~0.15–1.2 m sea-level equivalent smaller than present in the early or mid-Holocene when forcing an ice-sheet model with temperature reconstructions that contain a climatic optimum, and that the ice sheet has continued to recover from this minimum up to present day. Reconstructions without a warm climatic optimum in the early Holocene result in smaller ice losses continuing throughout the last 10 kyr. For all the simulated ice-sheet histories, the ice sheet is approaching a steady state at the end of the 20th century.
影响因子：
5.2
作者：
Bamber, J. L.;Griggs, J. A.;Steinhage, D.
通讯作者：
Steinhage, D.