globalchange  > 气候变化与战略
DOI: 10.1029/2018GB006135
论文题名:
Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure
作者: Braghiere R.K.; Quaife T.; Black E.; He L.; Chen J.M.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期:11
语种: 英语
学科: Earth System Models ; light interception ; photosynthesis ; radiative transfer schemes ; tropical forests ; vegetation clumping
中文摘要: 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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160096
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Braghiere R.K.,Quaife T.,Black E.,et al. Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure[J]. Global Biogeochemical Cycles,2019-01-01,33(11)
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