DOI: 10.5194/cp-14-887-2018
Scopus记录号: 2-s2.0-85049228407
论文题名: Arctic warming induced by the Laurentide Ice Sheet topography
作者: Liakka J. ; Lofverstrom M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 6 起始页码: 887
结束页码: 900
语种: 英语
Scopus关键词: albedo
; atmospheric circulation
; atmospheric modeling
; atmospheric wave
; climate feedback
; elevation
; energy flux
; glacial-interglacial cycle
; global warming
; Last Glacial Maximum
; Laurentide Ice Sheet
; proxy climate record
; reconstruction
; topography
; water vapor
; Arctic
英文摘要: It is well known that ice sheet-climate feedbacks are essential for realistically simulating the spatiotemporal evolution of continental ice sheets over glacial-interglacial cycles. However, many of these feedbacks are dependent on the ice sheet thickness, which is poorly constrained by proxy data records. For example, height estimates of the Laurentide Ice Sheet (LIS) topography at the Last Glacial Maximum (LGM; ∼21 000 years ago) vary by more than 1 km among different ice sheet reconstructions. In order to better constrain the LIS elevation it is therefore important to understand how the mean climate is influenced by elevation discrepancies of this magnitude. Here we use an atmospheric circulation model coupled to a slab-ocean model to analyze the LGM surface temperature response to a broad range of LIS elevations (from 0 to over 4 km).We find that raising the LIS topography induces a widespread surface warming in the Arctic region, amounting to approximately 1.5 °C per km of elevation increase, or about 6.5 °C for the highest LIS. The warming is attributed to an increased poleward energy flux by atmospheric stationary waves, amplified by surface albedo and water vapor feedbacks, which account for about twothirds of the total temperature response. These results suggest a strong feedback between continental-scale ice sheets and the Arctic temperatures that may help constrain LIS elevation estimates for the LGM and explain differences in ice distribution between the LGM and earlier glacial periods. © 2018 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109553
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Nansen Environmental and Remote Sensing Center, Bjerknes Centre for Climate Research, Thormøhlensgate 47, Bergen, 5006, Norway; National Center for Atmospheric Research, 3090 Center Green Dr., Boulder, CO 80301, United States
Recommended Citation:
Liakka J.,Lofverstrom M.. Arctic warming induced by the Laurentide Ice Sheet topography[J]. Climate of the Past,2018-01-01,14(6)