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Article Type:
Research Article

Groundwater Constraints on Simulated Transpiration Variability over Southeastern Australian Forests

M. Decker Climate Change Research Centre, University of New South Wales, Sydney, New South Wales, Australia

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A. J. Pitman ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, New South Wales, Australia

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J. P. Evans Climate Change Research Centre, University of New South Wales, Sydney, New South Wales, Australia

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Print Publication:
01 Apr 2013
DOI:
https://doi.org/10.1175/JHM-D-12-058.1
Page(s):
543–559
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Abstract

A land surface scheme with and without groundwater–vegetation interactions is used to explore the impact of rainfall variability on transpiration over drought-vulnerable regions of southeastern Australia. The authors demonstrate that if groundwater is included in the simulations, there is a low correlation between rainfall variability and the response of transpiration to this variability over forested regions. Groundwater reduces near-surface water variability, enabling forests to maintain transpiration through several years of low rainfall, in agreement with independent observations of vegetation greenness. If groundwater is not included, the transpiration variability matches the rainfall variability independent of land cover type. The authors’ results suggest that omitting groundwater in regions where groundwater sustains forests will 1) probably overestimate the likelihood of forest dieback during drought, 2) overestimate a positive feedback linked with declining transpiration and a drying boundary layer, and 3) underestimate the impact of land cover change due to inadequately simulating the different responses to drought for different land cover types.

Corresponding author address: Mark Decker, Climate Change Research Centre, Level 4 Mathews Building, University of New South Wales, Sydney, NSW 2052, Australia. E-mail: m.decker@unsw.edu.au

Abstract

A land surface scheme with and without groundwater–vegetation interactions is used to explore the impact of rainfall variability on transpiration over drought-vulnerable regions of southeastern Australia. The authors demonstrate that if groundwater is included in the simulations, there is a low correlation between rainfall variability and the response of transpiration to this variability over forested regions. Groundwater reduces near-surface water variability, enabling forests to maintain transpiration through several years of low rainfall, in agreement with independent observations of vegetation greenness. If groundwater is not included, the transpiration variability matches the rainfall variability independent of land cover type. The authors’ results suggest that omitting groundwater in regions where groundwater sustains forests will 1) probably overestimate the likelihood of forest dieback during drought, 2) overestimate a positive feedback linked with declining transpiration and a drying boundary layer, and 3) underestimate the impact of land cover change due to inadequately simulating the different responses to drought for different land cover types.

Corresponding author address: Mark Decker, Climate Change Research Centre, Level 4 Mathews Building, University of New South Wales, Sydney, NSW 2052, Australia. E-mail: m.decker@unsw.edu.au
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