Statistics – Methodology
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3323403t&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 23, CiteID L23403
Statistics
Methodology
14
Global Change: Land/Atmosphere Interactions (1218, 1843, 3322), Hydrology: Drought, Hydrology: Eco-Hydrology, Hydrology: Evapotranspiration, Hydrology: Soil Moisture
Scientific paper
The sensitivity of evapotranspiration (ET) to soil moisture storage plays an important role in the land-atmosphere system. Yet little is known about its magnitude, or its dependence on vegetation, soil, and/or climate characteristics. Here we relate the sensitivity to the timescale of ET decay in absence of rainfall, and show that it can thus be derived from time series of ET alone. We analyze ET observations from 15 vegetated sites covering a range of climates conditions, yielding timescales of 15-35 days. Longer timescales (weaker ET sensitivity) are found in regions with seasonal droughts, or at sites with woody vegetation. We compare observed values with output of different land surface models (LSMs) from the Second Global Soil Wetness Project, revealing large inter-model differences and significant differences with observations. Our methodology can lead to improved representation of soil moisture effects on ET in LSMs.
Seneviratne Sonia I.
Teuling Adriaan J.
Troch Peter A.
Williams Carlisle
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