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Uncertainty in the estimation of potential evapotranspiration under climate change.

Kingston, D., Todd, M., Taylor, R., Thompson, J. and Arnell, N. W. (2009) Uncertainty in the estimation of potential evapotranspiration under climate change. Geophysical Research Letters, 36. L20403. ISSN 0094-8276

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To link to this article DOI: 10.1029/2009GL040267

Abstract/Summary

21st century climate change is projected to result in an intensification of the global hydrological cycle, but there is substantial uncertainty in how this will impact freshwater availability. A relatively overlooked aspect of this uncertainty pertains to how different methods of estimating potential evapotranspiration (PET) respond to changing climate. Here we investigate the global response of six different PET methods to a 2 °C rise in global mean temperature. All methods suggest an increase in PET associated with a warming climate. However, differences in PET climate change signal of over 100% are found between methods. Analysis of a precipitation/PET aridity index and regional water surplus indicates that for certain regions and GCMs, choice of PET method can actually determine the direction of projections of future water resources. As such, method dependence of the PET climate change signal is an important source of uncertainty in projections of future freshwater availability.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
Interdisciplinary centres and themes > Walker Institute for Climate System Research
ID Code:2025
Uncontrolled Keywords:climate change; potential evapotranspiration; uncertainty Evapotranspiration; Atmospheric Processes: Climate change and variability; Hydrology: Water budgets; Hydroclimatology Hydrological cycles and budgets
Publisher:American Geophysical Union

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