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The sensitivity of water availability to changes in the aridity index and other factors—A probabilistic analysis in the Budyko space
Author(s) -
Gudmundsson L.,
Greve P.,
Seneviratne S. I.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069763
Subject(s) - aridity index , arid , index (typography) , environmental science , context (archaeology) , sensitivity (control systems) , probabilistic logic , climate change , climatology , atmospheric sciences , statistics , mathematics , geography , computer science , ecology , geology , engineering , archaeology , electronic engineering , world wide web , biology
One of the pending questions in the context of global change is whether climatic drivers or other factors have stronger influences on water availability. Here we present an approach that allows to estimate the probability that changes in the aridity index have a larger effect on water availability than equal relative changes in other factors. The analysis builds upon a probabilistic extension of the Budyko framework, which is subject to an analytical sensitivity assessment. The results show that changes in water availability are only dominated by changes in the aridity index in very humid climates. This implies that projected intensifications of aridity in drylands may have less influence on water availability than commonly assumed. Instead, other climatic or nonclimatic factors are dominating. The analysis does hence allow to map regions in which water availability is more sensitive to equal relative changes in either the aridity index or all other factors.