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CO 2 ‐vegetation feedbacks and other climate changes implicated in reducing base flow
Author(s) -
Trancoso Ralph,
Larsen Joshua R.,
McVicar Tim R.,
Phinn Stuart R.,
McAlpine Clive A.
Publication year - 2017
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 - 10.1002/2017gl072759
Subject(s) - evapotranspiration , base flow , environmental science , precipitation , vegetation (pathology) , streamflow , water cycle , climate change , water resources , hydrology (agriculture) , resource (disambiguation) , flow (mathematics) , atmospheric sciences , climatology , ecology , drainage basin , geography , meteorology , geology , biology , medicine , computer network , geometry , cartography , geotechnical engineering , mathematics , pathology , computer science
Changes in the hydrological cycle have a significant impact in water limited environments. Globally, some of these regions are experiencing declining precipitation yet are simultaneously becoming greener, partly due to vegetation feedbacks associated with increasing atmospheric CO 2 concentrations. Reduced precipitation together with increasing rates of actual evapotranspiration diminishes streamflow, especially base flow, a critical freshwater dry‐season resource. Here we assess recent changes in base flow in Australia from 1981–2013 and 1950–2013 and separate the contribution of precipitation, potential evapotranspiration, and other factors on base flow trends. Our findings reveal that these other factors influencing the base flow trends are best explained by an increase in photosynthetic activity. These results provide the first robust observational evidence that increasing atmospheric CO 2 and its associated vegetation feedbacks are reducing base flow in addition to other climatic impacts. These findings have broad implications for water resource management, especially in the world's water limited regions.