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Photosynthesis-depe...
Photosynthesis-dependent isoprene emission from leaf to planet in a global carbon-chemistry-climate model
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Unger, N. (author)
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Harper, K. (author)
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Zheng, Y. (author)
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show more...
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Kiang, N. Y. (author)
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Aleinov, I. (author)
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Arneth, A. (author)
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- Schurgers, Guy (author)
- Lund University,Lunds universitet,Institutionen för naturgeografi och ekosystemvetenskap,Naturvetenskapliga fakulteten,Dept of Physical Geography and Ecosystem Science,Faculty of Science
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Amelynck, C. (author)
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Goldstein, A. (author)
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Guenther, A. (author)
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Heinesch, B. (author)
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Hewitt, C. N. (author)
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Karl, T. (author)
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Laffineur, Q. (author)
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Langford, B. (author)
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McKinney, K. A. (author)
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Misztal, P. (author)
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Potosnak, M. (author)
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Rinne, J. (author)
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Pressley, S. (author)
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Schoon, N. (author)
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Seraca, D. (author)
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(creator_code:org_t)
- 2013-10-22
- 2013
- English.
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In: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7324. ; 13:20, s. 10243-10269
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http://dx.doi.org/10... (free)
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https://www.atmos-ch...
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Abstract
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- We describe the implementation of a biochemical model of isoprene emission that depends on the electron requirement for isoprene synthesis into the Farquhar-Ball-Berry leaf model of photosynthesis and stomatal conductance that is embedded within a global chemistry-climate simulation framework. The isoprene production is calculated as a function of electron transport-limited photosynthesis, intercellular and atmospheric carbon dioxide concentration, and canopy temperature. The vegetation biophysics module computes the photosynthetic uptake of carbon dioxide coupled with the transpiration of water vapor and the isoprene emission rate at the 30 min physical integration time step of the global chemistry-climate model. In the model, the rate of carbon assimilation provides the dominant control on isoprene emission variability over canopy temperature. A control simulation representative of the present-day climatic state that uses 8 plant functional types (PFTs), prescribed phenology and generic PFT-specific isoprene emission potentials (fraction of electrons available for isoprene synthesis) reproduces 50% of the variability across different ecosystems and seasons in a global database of 28 measured campaign-average fluxes. Compared to time-varying isoprene flux measurements at 9 select sites, the model authentically captures the observed variability in the 30 min average diurnal cycle (R-2 = 64-96 %) and simulates the flux magnitude to within a factor of 2. The control run yields a global isoprene source strength of 451 TgC yr(-1) that increases by 30% in the artificial absence of plant water stress and by 55% for potential natural vegetation.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Unger, N.
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Harper, K.
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Zheng, Y.
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Kiang, N. Y.
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Aleinov, I.
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Arneth, A.
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show more...
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Schurgers, Guy
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Amelynck, C.
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Goldstein, A.
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Guenther, A.
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Heinesch, B.
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Hewitt, C. N.
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Karl, T.
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Laffineur, Q.
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Langford, B.
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McKinney, K. A.
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Misztal, P.
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Potosnak, M.
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Rinne, J.
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Pressley, S.
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Schoon, N.
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Seraca, D.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
- Articles in the publication
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Atmospheric Chem ...
- By the university
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Lund University