干旱区生态环境知识资源中心(Arid): Global biosphere-climate interaction: a causal appraisal of observations and models over multiple temporal scales

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DOI	10.5194/bg-16-4851-2019
	Global biosphere-climate interaction: a causal appraisal of observations and models over multiple temporal scales
	Claessen, Jeroen 1; Molini, Annalisa 2; Martens, Brecht 1; Detto, Matteo 3; Demuzere, Matthias 1,4; Miralles, Diego G.1
通讯作者	Claessen, Jeroen
来源期刊	BIOGEOSCIENCES
ISSN	1726-4170
EISSN	1726-4189
出版年	2019
卷号	16 期号:24 页码:4851-4874
英文摘要	Improving the skill of Earth system models (ESMs) in representing climate-vegetation interactions is crucial to enhance our predictions of future climate and ecosystem functioning. Therefore, ESMs need to correctly simulate the impact of climate on vegetation, but likewise feedbacks of vegetation on climate must be adequately represented. However, model predictions at large spatial scales remain subjected to large uncertainties, mostly due to the lack of observational patterns to benchmark them. Here, the bidirectional nature of climate-vegetation interactions is explored across multiple temporal scales by adopting a spectral Granger causality framework that allows identification of potentially co-dependent variables. Results based on global and multi-decadal records of remotely sensed leaf area index (LAI) and observed atmospheric data show that the climate control on vegetation variability increases with longer temporal scales, being higher at inter-annual than multi-month scales. Globally, precipitation is the most dominant driver of vegetation at monthly scales, particularly in (semi-)arid regions. The seasonal LAI variability in energy-driven latitudes is mainly controlled by radiation, while air temperature controls vegetation growth and decay in high northern latitudes at inter-annual scales. These observational results are used as a benchmark to evaluate four ESM simulations from the Coupled Model Intercomparison Project Phase 5 (CMIP5). Findings indicate a tendency of ESMs to over-represent the climate control on LAI dynamics and a particular overestimation of the dominance of precipitation in arid and semi-arid regions at inter-annual scales. Analogously, CMIP5 models overestimate the control of air temperature on seasonal vege-tation variability, especially in forested regions. Overall, climate impacts on LAI are found to be stronger than the feedbacks of LAI on climate in both observations and models; in other words, local climate variability leaves a larger imprint on temporal LAI dynamics than vice versa. Note however that while vegetation reacts directly to its local climate conditions, the spatially collocated character of the analysis does not allow for the identification of remote feedbacks, which might result in an underestimation of the biophysical effects of vegetation on climate. Nonetheless, the widespread effect of LAI variability on radiation, as observed over the northern latitudes due to albedo changes, is overestimated by the CMIP5 models. Overall, our experiments emphasise the potential of benchmarking the representation of particular interactions in online ESMs using causal statistics in combination with observational data, as opposed to the more conventional evaluation of the magnitude and dynamics of individual variables.
类型	Article
语种	英语
国家	Belgium ; U Arab Emirates ; USA ; Germany
开放获取类型	Green Submitted, Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000504012300002
WOS关键词	LAND-SURFACE MODELS ; LEAF-AREA INDEX ; NET PRIMARY PRODUCTION ; EARTH SYSTEM MODEL ; DATA SETS ; VEGETATION ; SENSITIVITY ; FEEDBACKS ; CO2 ; VARIABILITY
WOS类目	Ecology ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
EI主题词	2019-12-20
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311859
作者单位	1.Univ Ghent, Dept Environm, Lab Hydrol & Water Management, Ghent, Belgium; 2.Khalifa Univ Sci & Technol, Masdar Inst, Abu Dhabi, U Arab Emirates; 3.Princeton Univ, Dept Ecol & Evolutionary Biol, Princeton, NJ 08544 USA; 4.Ruhr Univ Bochum, Dept Geog, Bochum, Germany
推荐引用方式 GB/T 7714	Claessen, Jeroen,Molini, Annalisa,Martens, Brecht,et al. Global biosphere-climate interaction: a causal appraisal of observations and models over multiple temporal scales[J],2019,16(24):4851-4874.
APA	Claessen, Jeroen,Molini, Annalisa,Martens, Brecht,Detto, Matteo,Demuzere, Matthias,&Miralles, Diego G..(2019).Global biosphere-climate interaction: a causal appraisal of observations and models over multiple temporal scales.BIOGEOSCIENCES,16(24),4851-4874.
MLA	Claessen, Jeroen,et al."Global biosphere-climate interaction: a causal appraisal of observations and models over multiple temporal scales".BIOGEOSCIENCES 16.24(2019):4851-4874.