Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model
Abstract
Surface fluxes from land surface models (LSMs) have traditionally been evaluated against monthly, seasonal or annual mean states. The limited ability of LSMs to reproduce observed evaporative fluxes under water-stressed conditions has been previously noted, but very few studies have systematically evaluated these models during rainfall deficits. We evaluated latent heat fluxes simulated by the Community Atmosphere Biosphere Land Exchange (CABLE) LSM across 20 flux tower sites at sub-annual to inter-annual timescales, in particular focusing on model performance during seasonal-scale rainfall deficits. The importance of key model processes in capturing the latent heat flux was explored by employing alternative representations of hydrology, leaf area index, soil properties and stomatal conductance. We found that the representation of hydrological processes was critical for capturing observed declines in latent heat during rainfall deficits. By contrast, the effects of soil properties, LAI and stomatal conductance were highly site-specific. Whilst the standard model performs reasonably well at annual scales as measured by common metrics, it grossly underestimates latent heat during rainfall deficits. A new version of CABLE, with a more physically consistent representation of hydrology, captures the variation in the latent heat flux during seasonal-scale rainfall deficits better than earlier versions, but remaining biases point to future researchmore »
- Authors:
-
- Univ. of New South Wales, Kensington, NSW (Australia)
- Macquarie Univ., North Ryde, NSW (Australia)
- Univ. of New South Wales, Kensington, NSW (Australia); Murdoch Univ., Murdoch, WA (Australia)
- CSIRO Ocean and Atmosphere, Aspendale, VIC (Australia)
- Publication Date:
- Research Org.:
- Oregon State Univ., Corvallis, OR (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1311615
- Grant/Contract Number:
- FG02-04ER63917; FG02-04ER63911
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Hydrology and Earth System Sciences (Online)
- Additional Journal Information:
- Journal Name: Hydrology and Earth System Sciences (Online); Journal Volume: 20; Journal Issue: 6; Journal ID: ISSN 1607-7938
- Publisher:
- European Geosciences Union (EGU)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Ukkola, Anna M., Pitman, Andy J., Decker, Mark, De Kauwe, Martin G., Abramowitz, Gab, Kala, Jatin, and Wang, Ying -Ping. Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model. United States: N. p., 2016.
Web. doi:10.5194/hess-20-2403-2016.
Ukkola, Anna M., Pitman, Andy J., Decker, Mark, De Kauwe, Martin G., Abramowitz, Gab, Kala, Jatin, & Wang, Ying -Ping. Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model. United States. https://doi.org/10.5194/hess-20-2403-2016
Ukkola, Anna M., Pitman, Andy J., Decker, Mark, De Kauwe, Martin G., Abramowitz, Gab, Kala, Jatin, and Wang, Ying -Ping. Tue .
"Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model". United States. https://doi.org/10.5194/hess-20-2403-2016. https://www.osti.gov/servlets/purl/1311615.
@article{osti_1311615,
title = {Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model},
author = {Ukkola, Anna M. and Pitman, Andy J. and Decker, Mark and De Kauwe, Martin G. and Abramowitz, Gab and Kala, Jatin and Wang, Ying -Ping},
abstractNote = {Surface fluxes from land surface models (LSMs) have traditionally been evaluated against monthly, seasonal or annual mean states. The limited ability of LSMs to reproduce observed evaporative fluxes under water-stressed conditions has been previously noted, but very few studies have systematically evaluated these models during rainfall deficits. We evaluated latent heat fluxes simulated by the Community Atmosphere Biosphere Land Exchange (CABLE) LSM across 20 flux tower sites at sub-annual to inter-annual timescales, in particular focusing on model performance during seasonal-scale rainfall deficits. The importance of key model processes in capturing the latent heat flux was explored by employing alternative representations of hydrology, leaf area index, soil properties and stomatal conductance. We found that the representation of hydrological processes was critical for capturing observed declines in latent heat during rainfall deficits. By contrast, the effects of soil properties, LAI and stomatal conductance were highly site-specific. Whilst the standard model performs reasonably well at annual scales as measured by common metrics, it grossly underestimates latent heat during rainfall deficits. A new version of CABLE, with a more physically consistent representation of hydrology, captures the variation in the latent heat flux during seasonal-scale rainfall deficits better than earlier versions, but remaining biases point to future research needs. Lastly, our results highlight the importance of evaluating LSMs under water-stressed conditions and across multiple plant functional types and climate regimes.},
doi = {10.5194/hess-20-2403-2016},
journal = {Hydrology and Earth System Sciences (Online)},
number = 6,
volume = 20,
place = {United States},
year = {Tue Jun 21 00:00:00 EDT 2016},
month = {Tue Jun 21 00:00:00 EDT 2016}
}
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