DOI: 10.1007/s00382-012-1495-9
Scopus记录号: 2-s2.0-84875732013
论文题名: An estimate of equilibrium sensitivity of global terrestrial carbon cycle using NCAR CCSM4
作者: Bala G. ; Krishna S. ; Devaraju D. ; Cao L. ; Caldeira K. ; Nemani R.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-07-08 起始页码: 1671
结束页码: 1686
语种: 英语
英文关键词: Carbon cycle feedback
; Climate change
; Terrestrial carbon cycle
英文摘要: Increasing concentrations of atmospheric CO2influence climate, terrestrial biosphere productivity and ecosystem carbon storage through its radiative, physiological and fertilization effects. In this paper, we quantify these effects for a doubling of CO2using a low resolution configuration of the coupled model NCAR CCSM4. In contrast to previous coupled climate-carbon modeling studies, we focus on the near-equilibrium response of the terrestrial carbon cycle. For a doubling of CO2, the radiative effect on the physical climate system causes global mean surface air temperature to increase by 2. 14 K, whereas the physiological and fertilization on the land biosphere effects cause a warming of 0. 22 K, suggesting that these later effects increase global warming by about 10 % as found in many recent studies. The CO2-fertilization leads to total ecosystem carbon gain of 371 Gt-C (28 %) while the radiative effect causes a loss of 131 Gt-C (~10 %) indicating that climate warming damps the fertilization-induced carbon uptake over land. Our model-based estimate for the maximum potential terrestrial carbon uptake resulting from a doubling of atmospheric CO2concentration (285-570 ppm) is only 242 Gt-C. This highlights the limited storage capacity of the terrestrial carbon reservoir. We also find that the terrestrial carbon storage sensitivity to changes in CO2and temperature have been estimated to be lower in previous transient simulations because of lags in the climate-carbon system. Our model simulations indicate that the time scale of terrestrial carbon cycle response is greater than 500 years for CO2-fertilization and about 200 years for temperature perturbations. We also find that dynamic changes in vegetation amplify the terrestrial carbon storage sensitivity relative to a static vegetation case: because of changes in tree cover, changes in total ecosystem carbon for CO2-direct and climate effects are amplified by 88 and 72 %, respectively, in simulations with dynamic vegetation when compared to static vegetation simulations. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55004
Appears in Collections: 过去全球变化的重建
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作者单位: Divecha Center for Climate Change, Center for Atmospheric and Oceanic Sciences, Indian Institute of Science, Bangalore, 560012, India; Department of Earth Sciences, Zhejiang University, Hangzhou, 310027 Zhejiang Province, China; Department of Global Ecology, Carnegie Institution, 260 Panama Street, Stanford, CA 94305, United States; NASA Ames Research Center, Moffett Field, CA 94035, United States
Recommended Citation:
Bala G.,Krishna S.,Devaraju D.,et al. An estimate of equilibrium sensitivity of global terrestrial carbon cycle using NCAR CCSM4[J]. Climate Dynamics,2013-01-01,40(2017-07-08)