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Title: Modelling evapotranspiration during precipitation deficits: Identifying critical processes in a land surface model

Journal Article · · Hydrology and Earth System Sciences (Online)
 [1];  [1];  [1];  [2];  [1];  [3];  [4]
  1. Univ. of New South Wales, Kensington, NSW (Australia)
  2. Macquarie Univ., North Ryde, NSW (Australia)
  3. Univ. of New South Wales, Kensington, NSW (Australia); Murdoch Univ., Murdoch, WA (Australia)
  4. CSIRO Ocean and Atmosphere, Aspendale, VIC (Australia)

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.

Research Organization:
Oregon State Univ., Corvallis, OR (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
FG02-04ER63917; FG02-04ER63911
OSTI ID:
1311615
Journal Information:
Hydrology and Earth System Sciences (Online), Vol. 20, Issue 6; ISSN 1607-7938
Publisher:
European Geosciences Union (EGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Cited By (8)

Evaluation of Groundwater Storage Variations Estimated from GRACE Data Assimilation and State-of-the-Art Land Surface Models in Australia and the North China Plain journal March 2018
On the use of the GRACE normal equation of inter-satellite tracking data for estimation of soil moisture and groundwater in Australia journal January 2018
Multimodel‐based analyses of evapotranspiration and its controls in China over the last three decades journal April 2020
The interactions between soil–biosphere–atmosphere (ISBA) land surface model multi-energy balance (MEB) option in SURFEXv8 – Part 2: Introduction of a litter formulation and model evaluation for local-scale forest sites journal January 2017
Intercomparison and Uncertainty Assessment of Nine Evapotranspiration Estimates Over South America journal April 2018
Land surface models systematically overestimate the intensity, duration and magnitude of seasonal-scale evaporative droughts journal October 2016
Global Investigation of Soil Moisture and Latent Heat Flux Coupling Strength journal October 2018
Testing water fluxes and storage from two hydrology configurations within the ORCHIDEE land surface model across US semi-arid sites journal January 2020

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