Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1088/1748-9326/ab3012 |
A review of the major drivers of the terrestrial carbon uptake: model-based assessments, consensus, and uncertainties | |
Tharammal, Thejna1; Bala, Govindasamy1; Devaraju, Narayanappa2; Nemani, Ramakrishna3 | |
2019-09-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2019 |
卷号 | 14期号:9 |
文章类型 | Review |
语种 | 英语 |
国家 | India; France; USA |
英文摘要 | Terrestrial and oceanic carbon sinks together sequester >50% of the anthropogenic emissions, and the major uncertainty in the global carbon budget is related to the terrestrial carbon cycle. Hence, it is important to understand the major drivers of the land carbon uptake to make informed decisions on climate change mitigation policies. In this paper, we assess the major drivers of the land carbon uptake-CO2 fertilization, nitrogen deposition, climate change, and land use/land cover changes (LULCC)-from existing literature for the historical period and future scenarios, focusing on the results from fifth Coupled Models Intercomparison Project (CMIP5). The existing literature shows that the LULCC fluxes have led to a decline in the terrestrial carbon stocks during the historical period, despite positive contributions from CO2 fertilization and nitrogen deposition. However, several studies find increases in the land carbon sink in recent decades and suggest that CO2 fertilization is the primary driver (up to 85%) of this increase followed by nitrogen deposition (similar to 10%-20%). For the 21st century, terrestrial carbon stocks are projected to increase in the majority of CMIP5 simulations under the representative concentration pathway 2.6 (RCP2.6), RCP4.5, and RCP8.5 scenarios, mainly due to CO2 fertilization. These projections indicate that the effects of nitrogen deposition in future scenarios are small (similar to 2%-10%), and climate warming would lead to a loss of land carbon. The vast majority of the studies consider the effects of only one or two of the drivers, impairing comprehensive assessments of the relative contributions of the drivers. Further, the broad range in magnitudes and scenario/model dependence of the sensitivity factors pose challenges in unambiguous projections of land carbon uptake. Improved representation of processes such as LULCC, fires, nutrient limitation and permafrost thawing in the models are necessary to constrain the present-day carbon cycle and for more accurate future projections. |
英文关键词 | land carbon sink climate change CO2 fertilization effect drivers of land carbon uptake |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000485678300001 |
WOS关键词 | LAND-COVER CHANGE ; GREENHOUSE-GAS CONCENTRATIONS ; INCREASING ATMOSPHERIC CO2 ; NET PRIMARY PRODUCTION ; EARTH SYSTEM MODELS ; CLIMATE-CHANGE ; INTERCOMPARISON PROJECT ; NITROGEN INTERACTIONS ; EMERGENT CONSTRAINTS ; RELATIVE IMPORTANCE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/186627 |
专题 | 气候变化 |
作者单位 | 1.Indian Inst Sci, Ctr Atmospher & Ocean Sci, Bangalore, Karnataka, India; 2.Univ Paris Saclay, Unite Mixte CEA CNRS UVSQ, IPSL, LSCE, F-91191 Gif Sur Yvette, France; 3.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA |
推荐引用方式 GB/T 7714 | Tharammal, Thejna,Bala, Govindasamy,Devaraju, Narayanappa,et al. A review of the major drivers of the terrestrial carbon uptake: model-based assessments, consensus, and uncertainties[J]. ENVIRONMENTAL RESEARCH LETTERS,2019,14(9). |
APA | Tharammal, Thejna,Bala, Govindasamy,Devaraju, Narayanappa,&Nemani, Ramakrishna.(2019).A review of the major drivers of the terrestrial carbon uptake: model-based assessments, consensus, and uncertainties.ENVIRONMENTAL RESEARCH LETTERS,14(9). |
MLA | Tharammal, Thejna,et al."A review of the major drivers of the terrestrial carbon uptake: model-based assessments, consensus, and uncertainties".ENVIRONMENTAL RESEARCH LETTERS 14.9(2019). |
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