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Title: A global scale mechanistic model of photosynthetic capacity (LUNA V1.0)

Abstract

Although plant photosynthetic capacity as determined by the maximum carboxylation rate (i.e., Vc, max25) and the maximum electron transport rate (i.e.,Jmax25) at a reference temperature (generally 25 °C) is known to vary considerably in space and time in response to environmental conditions, it is typically parameterized in Earth system models (ESMs) with tabulated values associated with plant functional types. In this study, we have developed a mechanistic model of leaf utilization of nitrogen for assimilation (LUNA) to predict photosynthetic capacity at the global scale under different environmental conditions. We adopt an optimality hypothesis to nitrogen allocation among light capture, electron transport, carboxylation and respiration. The LUNA model is able to reasonably capture the measured spatial and temporal patterns of photosynthetic capacity as it explains ~55 % of the global variation in observed values of Vc, max25 and ~65 % of the variation in the observed values of Jmax25. Model simulations with LUNA under current and future climate conditions demonstrate that modeled values of Vc, max25 are most affected in high-latitude regions under future climates. ESMs that relate the values of Vc, max25 or Jmax25 to plant functional types only are likely to substantially overestimate future global photosynthesis.

Authors:
; ; ORCiD logo; ; ; ORCiD logo; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1237866
Alternate Identifier(s):
OSTI ID: 1267038; OSTI ID: 1336062; OSTI ID: 1409750
Report Number(s):
BNL-112436-2016-JA; LA-UR-14-23309
Journal ID: ISSN 1991-9603
Grant/Contract Number:  
NGEE-Arctic; AC05-00OR22725; SC0012704; AC52-06NA25396
Resource Type:
Published Article
Journal Name:
Geoscientific Model Development (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development (Online) Journal Volume: 9 Journal Issue: 2; Journal ID: ISSN 1991-9603
Publisher:
Copernicus Publications, EGU
Country of Publication:
Germany
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; carbon cycle; climate variables; leaf nitrogen optimization; model-data synthesis

Citation Formats

Ali, A. A., Xu, C., Rogers, A., Fisher, R. A., Wullschleger, S. D., Massoud, E. C., Vrugt, J. A., Muss, J. D., McDowell, N. G., Fisher, J. B., Reich, P. B., and Wilson, C. J. A global scale mechanistic model of photosynthetic capacity (LUNA V1.0). Germany: N. p., 2016. Web. doi:10.5194/gmd-9-587-2016.
Ali, A. A., Xu, C., Rogers, A., Fisher, R. A., Wullschleger, S. D., Massoud, E. C., Vrugt, J. A., Muss, J. D., McDowell, N. G., Fisher, J. B., Reich, P. B., & Wilson, C. J. A global scale mechanistic model of photosynthetic capacity (LUNA V1.0). Germany. https://doi.org/10.5194/gmd-9-587-2016
Ali, A. A., Xu, C., Rogers, A., Fisher, R. A., Wullschleger, S. D., Massoud, E. C., Vrugt, J. A., Muss, J. D., McDowell, N. G., Fisher, J. B., Reich, P. B., and Wilson, C. J. Fri . "A global scale mechanistic model of photosynthetic capacity (LUNA V1.0)". Germany. https://doi.org/10.5194/gmd-9-587-2016.
@article{osti_1237866,
title = {A global scale mechanistic model of photosynthetic capacity (LUNA V1.0)},
author = {Ali, A. A. and Xu, C. and Rogers, A. and Fisher, R. A. and Wullschleger, S. D. and Massoud, E. C. and Vrugt, J. A. and Muss, J. D. and McDowell, N. G. and Fisher, J. B. and Reich, P. B. and Wilson, C. J.},
abstractNote = {Although plant photosynthetic capacity as determined by the maximum carboxylation rate (i.e., Vc, max25) and the maximum electron transport rate (i.e.,Jmax25) at a reference temperature (generally 25 °C) is known to vary considerably in space and time in response to environmental conditions, it is typically parameterized in Earth system models (ESMs) with tabulated values associated with plant functional types. In this study, we have developed a mechanistic model of leaf utilization of nitrogen for assimilation (LUNA) to predict photosynthetic capacity at the global scale under different environmental conditions. We adopt an optimality hypothesis to nitrogen allocation among light capture, electron transport, carboxylation and respiration. The LUNA model is able to reasonably capture the measured spatial and temporal patterns of photosynthetic capacity as it explains ~55 % of the global variation in observed values of Vc, max25 and ~65 % of the variation in the observed values of Jmax25. Model simulations with LUNA under current and future climate conditions demonstrate that modeled values of Vc, max25 are most affected in high-latitude regions under future climates. ESMs that relate the values of Vc, max25 or Jmax25 to plant functional types only are likely to substantially overestimate future global photosynthesis.},
doi = {10.5194/gmd-9-587-2016},
journal = {Geoscientific Model Development (Online)},
number = 2,
volume = 9,
place = {Germany},
year = {Fri Feb 12 00:00:00 EST 2016},
month = {Fri Feb 12 00:00:00 EST 2016}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.5194/gmd-9-587-2016

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