气候变化领域集成服务门户(CCPortal): Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure

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DOI	10.1029/2018GB006135
	Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure
	Braghiere R.K.; Quaife T.; Black E.; He L.; Chen J.M.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1358
结束页码	1369
卷号	33 期号:11
英文摘要	The impact of vegetation structure on the absorption of shortwave radiation in Earth System Models (ESMs) is potentially important for accurate modeling of the carbon cycle and hence climate projections. A proportion of incident shortwave radiation is used by plants to photosynthesize and canopy structure has a direct impact on the fraction of this radiation which is absorbed. This paper evaluates how modeled carbon assimilation of the terrestrial biosphere is impacted when clumping derived from satellite data is incorporated. We evaluated impacts of clumping on photosynthesis using the Joint UK Land Environment Simulator, the land surface scheme of the UK Earth System Model. At the global level, Gross Primary Productivity (GPP) increased by 5.53 ± 1.02 PgC/year with the strongest absolute increase in the tropics. This is contrary to previous studies that have shown a decrease in photosynthesis when similar clumping data sets have been used to modify light interception in models. In our study additional transmission of light through upper canopy layers leads to enhanced absorption in lower layers in which photosynthesis tends to be light limited. We show that this result is related to the complexity of canopy scheme being used. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Earth System Models; light interception; photosynthesis; radiative transfer schemes; tropical forests; vegetation clumping
语种	英语
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129701
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; INRA-Supagro, Montpellier, France; National Centre for Earth Observation, Department of Meteorology, University of Reading, Reading, United Kingdom; National Centre for Atmospheric Science, Department of Meteorology, University of Reading, Reading, United Kingdom; Department of Geography and Program in Planning, University of Toronto, Toronto, ON, Canada; Laboratory of Environmental Model and Data Optima, Laurel, MD, United States
推荐引用方式 GB/T 7714	Braghiere R.K.,Quaife T.,Black E.,et al. Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure[J],2019,33(11).
APA	Braghiere R.K.,Quaife T.,Black E.,He L.,&Chen J.M..(2019).Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure.Global Biogeochemical Cycles,33(11).
MLA	Braghiere R.K.,et al."Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure".Global Biogeochemical Cycles 33.11(2019).