DOI: 10.1175/JCLI-D-12-00305.1
Scopus记录号: 2-s2.0-84878300798
论文题名: Effects of soil moisture on the responses of soil temperatures to climate change in cold regions
作者: Subin Z.M. ; Koven C.D. ; Riley W.J. ; Torn M.S. ; Lawrence D.M. ; Swenson S.C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 10 起始页码: 3139
结束页码: 3158
语种: 英语
Scopus关键词: Air temperature changes
; Atmospheric forcing
; Community land models
; Latent heat of fusion
; Model experiments
; Permafrost region
; Soil thermal conductivity
; Water-filled pore space
; Carbon dioxide
; Climate change
; Experiments
; Rain
; Soil moisture
; Temperature
; Permafrost
; air temperature
; atmospheric forcing
; carbon dioxide
; climate change
; cold region
; concentration (composition)
; permafrost
; rainfall
; soil moisture
; soil temperature
; thermal conductivity
; vegetation
; warming
英文摘要: At high latitudes, changes in soil moisture could alter soil temperatures independently of air temperature changes by interacting with the snow thermal rectifier. The authors investigated this mechanism with model experiments in the Community Land Model 4 (CLM4) with prescribed atmospheric forcing and vegetation state. Under equilibriumhistorical conditions, increasing CO2 concentrations experienced by plants from 285 to 857 ppm caused local increases in soil water-filled pore space of 0.1-0.2 in some regions throughout the globe. In permafrost regions that experienced this moistening, vertical- and annual- mean soil temperatures increased by up to 3°C (0.27°C averaged over all permafrost areas). A similar pattern of moistening and consequent warming occurred in simulations with prescribed June-September (JJAS) rainfall increases of 25% over historical values, a level of increase commensurate with projected future rainfall increases. There was a strong sensitivity of the moistening responses to the baseline hydrological state. Experiments with perturbed physics confirmed that the simulated warming in permafrost soils was caused by increases in the soil latent heat of fusion per unit volume and in the soil thermal conductivity due to the increased moisture. In transient Representative Concentration Pathway 8.5 (RCP8.5) scenario experiments, soil warming due to increased CO2 or JJAS rainfall was smaller in magnitude and spatial extent than in the equilibrium experiments. Active-layer deepening associated with soil moisture changes occurred over less than 8% of the current permafrost area because increased heat of fusion and soil thermal conductivity had compensating effects on active-layer depth. Ongoing modeling challenges make these results tentative. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51931
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Princeton Environmental Institute, Princeton, NJ, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States; National Center for Atmospheric Research, Boulder, CO, United States
Recommended Citation:
Subin Z.M.,Koven C.D.,Riley W.J.,et al. Effects of soil moisture on the responses of soil temperatures to climate change in cold regions[J]. Journal of Climate,2013-01-01,26(10)