DOI: 10.1007/s00382-014-2185-6
Scopus记录号: 2-s2.0-84939875364
论文题名: On the Arctic near-surface permafrost and climate sensitivities to soil and snow model formulations in climate models
作者: Paquin J.-P. ; Sushama L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 44, 期: 2017-01-02 起始页码: 203
结束页码: 228
语种: 英语
英文关键词: Active layer thickness
; Land surface model
; Permafrost
; Regional climate model
; Soil carbon
英文摘要: This study investigates the sensitivity of the Canadian Regional Climate Model (CRCM5) simulated near surface permafrost and its climate interactions to soil and snow formulations. In particular, sensitivities to the depth of the soil column, inclusion of organic soils and modified snow conductivity formulation are investigated. The impact of these modifications are first assessed in offline simulations performed with the Canadian Land Surface Scheme (CLASS), which is the land surface scheme used in CRCM5, when driven by ERA-40/ERA-Interim for the 1957–2008 period. Analysis of CLASS simulations shows major improvements in the simulated permafrost extent, particularly with a deeper soil column. Inclusion of organic soil decreased the summer ground heat flux and therefore the summer soil temperatures, leading to improvements in the simulated active layer thickness (ALT). The impact of the new snow thermal conductivity formulation is moderate compared to the effect of organic soils, but reduces the cold biases in winter soil temperatures. CRCM5 experiments revealed similar sensitivities to soil depth, organic soil and snow conductivity changes as with the offline simulations. Significant changes are noted in the land–atmosphere interactions, through modified energy and moisture partitioning at the surface resulting from the inclusion of the organic soils. The inter-annual variability of the ALT shows larger sensitivities to summer temperatures for mineral soil while experiments including organic soils show increased sensitivities to annual temperatures. The ALT trends in the CRCM5 are similar to the observed values, despite the overestimation of ALT associated with a warm bias in the CRCM5 climate. © 2014, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54603
Appears in Collections: 过去全球变化的重建
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作者单位: Département des Sciences de la Terre et de l’atmosphère, Centre ESCER, Université du Québec à Montréal, 201 av. du Président-Kennedy, Montreal, QC, Canada
Recommended Citation:
Paquin J.-P.,Sushama L.. On the Arctic near-surface permafrost and climate sensitivities to soil and snow model formulations in climate models[J]. Climate Dynamics,2014-01-01,44(2017-01-02)