A test of an optimal stomatal conductance scheme within the CABLE land surface model
Stomatal conductance (gs) affects the fluxes of carbon, energy and water between the vegetated land surface and the atmosphere. We test an implementation of an optimal stomatal conductance model within the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model (LSM). In common with...
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ftunivwestsyd:oai:researchdirect.westernsydney.edu.au:uws_29047 2023-05-15T18:40:15+02:00 A test of an optimal stomatal conductance scheme within the CABLE land surface model De Kauwe, Martin G. Kala, Jatin Lin, Yan-Shih Pitman, Andrew J. Medlyn, Belinda E. (R18040) Duursma, Remko A. (R12398) Abramowitz, Gab Wang, Yingping Miralles, Diego G. Hawkesbury Institute for the Environment (Host institution) 2015 print 22 http://handle.uws.edu.au:8081/1959.7/uws:29047 https://doi.org/10.5194/gmd-8-431-2015 eng eng Germany, Copernicus Geoscientific Model Development--1991-959X--1991-9603 Vol. 8 Issue. 2 pp: 431-452 http://purl.org/au-research/grants/arc/DP120104055 http://purl.org/au-research/grants/arc/CE1101028 © Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY XXXXXX - Unknown bioclimatography stomatal tundra journal article Text 2015 ftunivwestsyd https://doi.org/10.5194/gmd-8-431-2015 2020-12-05T18:17:00Z Stomatal conductance (gs) affects the fluxes of carbon, energy and water between the vegetated land surface and the atmosphere. We test an implementation of an optimal stomatal conductance model within the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model (LSM). In common with many LSMs, CABLE does not differentiate between gs model parameters in relation to plant functional type (PFT), but instead only in relation to photosynthetic pathway. We constrained the key model parameter “g1”, which represents plant water use strategy, by PFT, based on a global synthesis of stomatal behaviour. As proof of concept, we also demonstrate that the g1 parameter can be estimated using two long-term average (1960–1990) bioclimatic variables: (i) temperature and (ii) an indirect estimate of annual plant water availability. The new stomatal model, in conjunction with PFT parameterisations, resulted in a large reduction in annual fluxes of transpiration (approx. 30% compared to the standard CABLE simulations) across evergreen needleleaf, tundra and C4 grass regions. Differences in other regions of the globe were typically small. Model performance against upscaled data products was not degraded, but did not noticeably reduce existing model–data biases.We identified assumptions relating to the coupling of the vegetation to the atmosphere and the parameterisation of the minimum stomatal conductance as areas requiring further investigation in both CABLE and potentially other LSMs. We conclude that optimisation theory can yield a simple and tractable approach to predicting stomatal conductance in LSMs. Article in Journal/Newspaper Tundra University of Western Sydney (UWS): Research Direct Geoscientific Model Development 8 2 431 452 |
institution |
Open Polar |
collection |
University of Western Sydney (UWS): Research Direct |
op_collection_id |
ftunivwestsyd |
language |
English |
topic |
XXXXXX - Unknown bioclimatography stomatal tundra |
spellingShingle |
XXXXXX - Unknown bioclimatography stomatal tundra De Kauwe, Martin G. Kala, Jatin Lin, Yan-Shih Pitman, Andrew J. Medlyn, Belinda E. (R18040) Duursma, Remko A. (R12398) Abramowitz, Gab Wang, Yingping Miralles, Diego G. A test of an optimal stomatal conductance scheme within the CABLE land surface model |
topic_facet |
XXXXXX - Unknown bioclimatography stomatal tundra |
description |
Stomatal conductance (gs) affects the fluxes of carbon, energy and water between the vegetated land surface and the atmosphere. We test an implementation of an optimal stomatal conductance model within the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model (LSM). In common with many LSMs, CABLE does not differentiate between gs model parameters in relation to plant functional type (PFT), but instead only in relation to photosynthetic pathway. We constrained the key model parameter “g1”, which represents plant water use strategy, by PFT, based on a global synthesis of stomatal behaviour. As proof of concept, we also demonstrate that the g1 parameter can be estimated using two long-term average (1960–1990) bioclimatic variables: (i) temperature and (ii) an indirect estimate of annual plant water availability. The new stomatal model, in conjunction with PFT parameterisations, resulted in a large reduction in annual fluxes of transpiration (approx. 30% compared to the standard CABLE simulations) across evergreen needleleaf, tundra and C4 grass regions. Differences in other regions of the globe were typically small. Model performance against upscaled data products was not degraded, but did not noticeably reduce existing model–data biases.We identified assumptions relating to the coupling of the vegetation to the atmosphere and the parameterisation of the minimum stomatal conductance as areas requiring further investigation in both CABLE and potentially other LSMs. We conclude that optimisation theory can yield a simple and tractable approach to predicting stomatal conductance in LSMs. |
author2 |
Hawkesbury Institute for the Environment (Host institution) |
format |
Article in Journal/Newspaper |
author |
De Kauwe, Martin G. Kala, Jatin Lin, Yan-Shih Pitman, Andrew J. Medlyn, Belinda E. (R18040) Duursma, Remko A. (R12398) Abramowitz, Gab Wang, Yingping Miralles, Diego G. |
author_facet |
De Kauwe, Martin G. Kala, Jatin Lin, Yan-Shih Pitman, Andrew J. Medlyn, Belinda E. (R18040) Duursma, Remko A. (R12398) Abramowitz, Gab Wang, Yingping Miralles, Diego G. |
author_sort |
De Kauwe, Martin G. |
title |
A test of an optimal stomatal conductance scheme within the CABLE land surface model |
title_short |
A test of an optimal stomatal conductance scheme within the CABLE land surface model |
title_full |
A test of an optimal stomatal conductance scheme within the CABLE land surface model |
title_fullStr |
A test of an optimal stomatal conductance scheme within the CABLE land surface model |
title_full_unstemmed |
A test of an optimal stomatal conductance scheme within the CABLE land surface model |
title_sort |
test of an optimal stomatal conductance scheme within the cable land surface model |
publisher |
Germany, Copernicus |
publishDate |
2015 |
url |
http://handle.uws.edu.au:8081/1959.7/uws:29047 https://doi.org/10.5194/gmd-8-431-2015 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
Geoscientific Model Development--1991-959X--1991-9603 Vol. 8 Issue. 2 pp: 431-452 http://purl.org/au-research/grants/arc/DP120104055 http://purl.org/au-research/grants/arc/CE1101028 |
op_rights |
© Author(s) 2015. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/gmd-8-431-2015 |
container_title |
Geoscientific Model Development |
container_volume |
8 |
container_issue |
2 |
container_start_page |
431 |
op_container_end_page |
452 |
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1766229536203079680 |