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Title: Do land surface models need to include differential plant species responses to drought? Examining model predictions across a mesic-xeric gradient in Europe

Journal Article · · Biogeosciences (Online)
 [1];  [2];  [3];  [4];  [5];  [6]; ORCiD logo [7]
  1. Macquarie Univ., New South Wales (Australia)
  2. Macquarie Univ., New South Wales (Australia); CSIRO Agriculture Flagship, Glen Osmond (Australia)
  3. Macquarie Univ., New South Wales (Australia); Western Sydney Univ., Penrith, NSW (Australia)
  4. Australian Research Council Centre of Excellence for Climate Systems Science and Climate Change Research Centre, Sydney (Australia)
  5. CSIRO Ocean and Atmosphere Flagship, Aspendale, VIC (Australia)
  6. Western Sydney Univ., Penrith, NSW (Australia)
  7. Macquarie Univ., New South Wales (Australia); Imperial College London (United Kingdom)

Future climate change has the potential to increase drought in many regions of the globe, making it essential that land surface models (LSMs) used in coupled climate models realistically capture the drought responses of vegetation. Recent data syntheses show that drought sensitivity varies considerably among plants from different climate zones, but state-of-the-art LSMs currently assume the same drought sensitivity for all vegetation. We tested whether variable drought sensitivities are needed to explain the observed large-scale patterns of drought impact on the carbon, water and energy fluxes. We implemented data-driven drought sensitivities in the Community Atmosphere Biosphere Land Exchange (CABLE) LSM and evaluated alternative sensitivities across a latitudinal gradient in Europe during the 2003 heatwave. The model predicted an overly abrupt onset of drought unless average soil water potential was calculated with dynamic weighting across soil layers. We found that high drought sensitivity at the most mesic sites, and low drought sensitivity at the most xeric sites, was necessary to accurately model responses during drought. Furthermore, our results indicate that LSMs will over-estimate drought impacts in drier climates unless different sensitivity of vegetation to drought is taken into account.

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:
1312907
Journal Information:
Biogeosciences (Online), Vol. 12, Issue 24; ISSN 1726-4189
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 75 works
Citation information provided by
Web of Science

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Joint structural and physiological control on the interannual variation in productivity in a temperate grassland: A data-model comparison journal May 2018
Gross primary production responses to warming, elevated CO 2 , and irrigation: quantifying the drivers of ecosystem physiology in a semiarid grassland journal March 2017
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High water use in desert plants exposed to extreme heat journal May 2020
Water-stress-induced breakdown of carbon–water relations: indicators from diurnal FLUXNET patterns journal January 2018
Challenges and opportunities in land surface modelling of savanna ecosystems journal January 2017
Bridging Drought Experiment and Modeling: Representing the Differential Sensitivities of Leaf Gas Exchange to Drought journal January 2019
Challenges and opportunities in land surface modelling of savanna ecosystems text January 2017
A roadmap for improving the representation of photosynthesis in Earth system models journal November 2016
Earth System Model Needs for Including the Interactive Representation of Nitrogen Deposition and Drought Effects on Forested Ecosystems journal July 2017
Impact of the representation of stomatal conductance on model projections of heatwave intensity journal March 2016
State-of-the-art global models underestimate impacts from climate extremes journal March 2019
Using models to guide field experiments: a priori predictions for the CO 2 response of a nutrient- and water-limited native Eucalypt woodland journal May 2016
Triggers of tree mortality under drought journal June 2018
A model inter-comparison study to examine limiting factors in modelling Australian tropical savannas journal December 2015
Challenging terrestrial biosphere models with data from the long‐term multifactor Prairie Heating and CO 2 Enrichment experiment journal March 2017
State-of-the-art global models underestimate impacts from climate extremes. journalarticle January 2019
Plant profit maximization improves predictions of European forest responses to drought journal January 2020
State-of-the-art global models underestimate impacts from climate extremes text January 2019
Land-atmospheric feedbacks during droughts and heatwaves: state of the science and current challenges: Land feedbacks during droughts and heatwaves journal June 2018