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Soil moisture timescales reference site
Upcoming events
2 Events found:
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Thu 14. Jun. 2012 14:00
: ETH Zentrum, CHN P 12
Neville Nicholls : El Nino in climate models, global frontal precipitation, drought impacts on heat waves, and historical changes in the usage of weather terms
Special Event (Extraordinary Seminar) ABSTRACT_Neville_Nichols.pdf
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Mon 18. Jun. 2012 13:15
: ETH Zentrum, CHN L 17.1
Dr. Scott Power : Water circulation, tropical cyclones, global warming and future precipitation change
Special Event (Extraordinary Seminar)
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ETH-Klimablog
Das IAC bloggt auf dem ETH-Klimablog, der Informationsplattform der ETH Zürich zum Klimawandel. Mehr auf www.klimablog.ethz.ch.
Soil moisture is an important memory component in the coupled land-atmosphere system. Previously, the soil moisture reservoir characteristics (the "memory") have been derived mainly from sparse soil moisture observations through autocorrelation decay analysis. Teuling et al (2007) have proposed to derive the reservoir constant directly from observations of evapotranspiration during prolonged rainless periods. An overview of land surface response times can aid in land surface model parameterisation, calibration, and validation. This site aims to establish such an overview.
Timescales from field observations (summary)
| Site | Vegetation/Land use | Year | e-folding time ET [d] | e-folding time ET/Rg | e-folding time ET/Rn |
| Audubon | Desert grassland | 2004 | 34.7 | 32.9 | 34.7 |
| Bondville | Cropland | 1998 | 18.0 | 18.8 | 22.5 |
| 1999 | 13.4 | 15.5 | 18.9 | ||
| Ejura | Transitional savanna | 2002 | 117 | 116 | -228 |
| Ghanzi | Grassland | 2002 | 14.2 | 13.8 | 20.1 |
| Ghanzi | Mixed (shrub/trees) | 2002 | 16.2 | 16.7 | 21.3 |
| Ione (Tonzi ranch) | Oak savanna | 2001 | 36.8 | 35.0 | |
| Ione (Vaira ranch) | Annual grassland | 2001 | 14.1 | 13.4 | 15.1 |
| Konza Prairie | Tallgrasss prairie | 1987 | 12.4 | 15.8 | 22.3 |
| Little Washita | Grassland | 1997 | 23.7 | 26.0 | 37.2 |
| 1998 | 32.3 | 29.7 | 39.9 | ||
| Rheindahlen | Grassland | 1990 | 21.0 | 36.9 | 37.9 |
| 1991 | 19.1 | 26.5 | 33.8 | ||
| 1995 | 20.3 | 25.3 | 29.8 | ||
| Roccarespampani | Deciduous broadleaf forest | 2003 | 36.0 | 36.8 | 35.2 |
| SEBEX | Fallow savanna | 1989 | 47.2 | 50.7 | 78.3 |
| SEBEX | Tiger-bush | 1989 | 118 | 136 | 758 |
| Tamale | Guinea savanna | 2002 | 19.0 | 20.8 | 25.7 |
| Twizel | Tussock grassland | 1998 | 16.6 | 15.3 | 16.7 |
Contributing data
Scientists are invited to add their observations of long drydowns to the dataset. This can be done by sending an email to ryan.teuling@env.ethz.ch, containing the site name, lat/lon coordinates, vegetation type/land cover, reference to any papers, year, observations of daily ET [mm/d] and dates at which the observations were made.
Reference paper
Teuling, A.J.; S.I. Seneviratne; C. Williams; and P.A. Troch (2006), Observed timescales of evapotranspiration response to soil moisture. Geophys. Res. Lett., 33(23), L23403, doi:10.1029/2006GL028178.
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