DOI: 10.1175/JCLI-D-15-0044.1
Scopus记录号: 2-s2.0-84950117585
论文题名: The North American Cordillera-An impediment to growing the continent-wide laurentide ice sheet
作者: Löfverström M. ; Liakka J. ; Kleman J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9433
结束页码: 9450
语种: 英语
Scopus关键词: Atmospheric temperature
; Clouds
; Earth atmosphere
; Glacial geology
; Glaciers
; Mechanical waves
; Surface properties
; Coupled models
; Ice loss/growth
; Large scale motion
; Rossby wave
; Topographic effects
; Ice
; advection
; atmospheric circulation
; atmospheric dynamics
; atmospheric general circulation model
; atmospheric modeling
; atmospheric wave
; continental interior
; ice margin
; ice sheet
; regional climate
; Rossby wave
; surface temperature
; topographic effect
; North America
英文摘要: This study examines the evolution of a continental-scale ice sheet on a triangular representation of North America, with and without the influence of the Cordilleran region. Simulations are conducted using a comprehensive atmospheric general circulation model asynchronously coupled to a three-dimensional thermomechanical ice-sheet model. The atmospheric state is updated for every 2 × 106 km3 increase in ice volume, and the coupled model is integrated to steady state. In the first experiment a flat continent with no background topography is used. The ice sheet evolves fairly zonally symmetric, and the equilibriumstate is continent-wide and has the highest point in the center of the continent. This equilibrium ice sheet forces an anticyclonic circulation that results in relatively warmer (cooler) summer surface temperatures in the northwest (southeast), owing to warm (cold) air advection and radiative heating due to reduced cloudiness. The second experiment includes a simplified representation of the Cordilleran region. The ice sheet's equilibrium state is here structurally different from the flat continent case; the center of mass is strongly shifted to the east and the interior of the continent remains ice free-an outline broadly resembling the geologically determined ice margin in Marine Isotope Stage 4. The limited glaciation in the continental interior is the result of warm summer surface temperatures primarily due to stationary waves and radiative feedbacks. © 2015 American Meteorological Society. 资助项目: MOHE, Ministry of Higher Education
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50802
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Meteorology, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Climate Change Research Section, Climate and Global Dynamics Division, NCAR, Boulder, CO, United States; Biodiversity and Climate Research Centre (BiK-F), Senckenberg Gesellschaft für Naturforschung, Frankfurt, Germany; Department of Physical Geography and Quaternary Geology, Stockholm University, Stockholm, Sweden
Recommended Citation:
Löfverström M.,Liakka J.,Kleman J.. The North American Cordillera-An impediment to growing the continent-wide laurentide ice sheet[J]. Journal of Climate,2015-01-01,28(23)