File(s) not publicly available
Uncertainty in the estimation of potential evapotranspiration under climate change
journal contributionposted on 2023-06-07, 17:19 authored by Daniel G Kingston, Martin ToddMartin Todd, Richard G Taylor, Julian R Thompson, Nigel W Arnell
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.
JournalGeophysical Research Letters
Department affiliated with
- Geography Publications
Full text available