DOI: 10.5194/cp-8-483-2012
Scopus记录号: 2-s2.0-84858854717
论文题名: Persistent influence of ice sheet melting on high northern latitude climate during the early Last Interglacial
作者: Govin A. ; Braconnot P. ; Capron E. ; Cortijo E. ; Duplessy J.-C. ; Jansen E. ; Labeyrie L. ; Landais A. ; Marti O. ; Michel E. ; Mosquet E. ; Risebrobakken B. ; Swingedouw D. ; Waelbroeck C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2012
卷: 8, 期: 2 起始页码: 483
结束页码: 507
语种: 英语
Scopus关键词: air-sea interaction
; climate change
; computer simulation
; ice sheet
; Last Interglacial
; latitude
; melting
; numerical model
; paleoclimate
; paleoenvironment
; resolution
; surface water
; uncertainty analysis
; Arctic Ocean
; Atlantic Ocean
; Labrador Sea
; Norwegian Sea
英文摘要: Although the Last Interglacial (LIG) is often considered as a possible analogue for future climate in high latitudes, its precise climate evolution and associated causes remain uncertain. Here we compile high-resolution marine sediment records from the North Atlantic, Labrador Sea, Norwegian Sea and the Southern Ocean. We document a delay in the establishment of peak interglacial conditions in the North Atlantic, Labrador and Norwegian Seas as compared to the Southern Ocean. In particular, we observe a persistent iceberg melting at high northern latitudes at the beginning of the LIG. It is associated with (1) colder and fresher surface-water conditions in the North Atlantic, Labrador and Norwegian Seas, and (2) a weaker ventilation of North Atlantic deep waters during the early LIG (129-125 ka) compared to the late LIG. Results from an ocean-atmosphere coupled model with insolation as a sole forcing for three key periods of the LIG show warmer North Atlantic surface waters and stronger Atlantic overturning during the early LIG (126 ka) than the late LIG (122 ka). Hence, insolation variations alone do not explain the delay in peak interglacial conditions observed at high northern latitudes. Additionally, we consider an idealized meltwater scenario at 126 ka where the freshwater input is interactively computed in response to the high boreal summer insolation. The model simulates colder, fresher North Atlantic surface waters and weaker Atlantic overturning during the early LIG (126 ka) compared to the late LIG (122 ka). This result suggests that both insolation and ice sheet melting have to be considered to reproduce the climatic pattern that we identify during the early LIG. Our model-data comparison also reveals a number of limitations and reinforces the need for further detailed investigations using coupled climate-ice sheet models and transient simulations. © 2012 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49603
Appears in Collections: 气候变化与战略
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Recommended Citation:
Govin A.,Braconnot P.,Capron E.,et al. Persistent influence of ice sheet melting on high northern latitude climate during the early Last Interglacial[J]. Climate of the Past,2012-01-01,8(2)