Back to Search
Start Over
Underestimation of Global Photosynthesis in Earth System Models Due to Representation of Vegetation Structure
- Source :
- Global Biogeochemical Cycles, Global Biogeochemical Cycles, 2019, pp.1358-1369. ⟨10.1029/2018GB006135⟩, Global Biogeochemical Cycles, American Geophysical Union, 2019, pp.1358-1369. ⟨10.1029/2018GB006135⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- International audience; 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.
- Subjects :
- 0106 biological sciences
Canopy
Atmospheric Science
010504 meteorology & atmospheric sciences
Photosynthesis
Atmospheric sciences
01 natural sciences
light interception
Carbon cycle
Environmental Chemistry
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
radiative transfer schemes
Shortwave radiation
Absorption (electromagnetic radiation)
0105 earth and related environmental sciences
General Environmental Science
tropical forests
Global and Planetary Change
photosynthesis
010604 marine biology & hydrobiology
Earth System Models
Biosphere
Vegetation
15. Life on land
13. Climate action
Environmental science
vegetation clumping
Interception
Subjects
Details
- Language :
- English
- ISSN :
- 08866236 and 19449224
- Database :
- OpenAIRE
- Journal :
- Global Biogeochemical Cycles, Global Biogeochemical Cycles, 2019, pp.1358-1369. ⟨10.1029/2018GB006135⟩, Global Biogeochemical Cycles, American Geophysical Union, 2019, pp.1358-1369. ⟨10.1029/2018GB006135⟩
- Accession number :
- edsair.doi.dedup.....dc4d93e506aba206523c3d4f0c39a3c9
- Full Text :
- https://doi.org/10.1029/2018GB006135⟩