DOI: 10.1175/JCLI-D-16-0576.1
Scopus记录号: 2-s2.0-85019055706
论文题名: Glacial inception on Baffin Island: The role of insolation, meteorology, and topography
作者: Birch L. ; Cronin T. ; Tziperman E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 11 起始页码: 4047
结束页码: 4064
语种: 英语
Scopus关键词: Climate change
; Glacial geology
; Incident solar radiation
; Meteorology
; Snow
; Solar radiation
; Topography
; Weather forecasting
; Climate variability
; Glaciation
; Horizontal resolution
; Last glacial inception
; Paleoclimates
; Snow-albedo feedbacks
; Surface mass balance
; Weather research and forecasting models
; Climate models
英文摘要: Geologic evidence suggests that the last glacial inception (115 kya) occurred within the mountains of Baffin Island. Global climate models (GCMs) have difficulty simulating this climate transition, likely because of their coarse horizontal resolution that smooths topography and necessitates the use of cumulus parameterizations. A regional configuration of the Weather Research and Forecasting (WRF) Model is used to simulate the small-scale topographic and cloud processes neglected by GCMs, and the sensitivity of the region to Milankovitch forcing, topography, and meteorology is tested. It is found that ice growth is possible with 115-kya insolation, realistic topography, and slightly colder-than-average meteorology, represented by specific years within the past three decades. The simulation with low GCM-like topography shows a negative surface mass balance, even with the relevant orbital parameter configuration, demonstrating the criticality of realistic topography. The downslope growth of the ice sheets is studied by looking at the sensitivity of the mass balance to initial snow cover prescribed beyond that of the present day. It is found that the snow-albedo feedback, via its effects on the mass balance, allows such larger snow cover to persist. Implications for GCM studies of glacial inception are discussed. © 2017 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48885
Appears in Collections: 气候变化与战略
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作者单位: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
Birch L.,Cronin T.,Tziperman E.. Glacial inception on Baffin Island: The role of insolation, meteorology, and topography[J]. Journal of Climate,2017-01-01,30(11)