Global gray-sky dT: the inverse of the surface psychrometric constant parameter in the SSEBop evapotranspiration model
The surface psychrometric constant (spc) is a key model parameter in actual evapotranspiration modeling using the Operational Simplified Surface Energy Balance (SSEBop) model for establishing model boundary limits for the dry/bare and wet/vegetated surface conditions. The inverse of the constant (1/spc) represents the temperature difference (dT) between the bare/dry surface and the air temperature at the canopy level. The main output of the SSEBop model is an ET fraction (0-1) and, when combined with reference (“maximum”) ET, produces an actual ET estimate from satellite-observed land surface temperature. This dT is determined using net radiation inputs under gray-sky radiations from the ERA-5 datasets, i.e., Surface Solar Radiation Downwards instead of clear-sky assumptions used for the previous dT versions. The dT estimates are adjusted for elevation effects using established equations.
Complete Metadata
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"fn": "Stefanie Kagone (CTR)",
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| description | The surface psychrometric constant (spc) is a key model parameter in actual evapotranspiration modeling using the Operational Simplified Surface Energy Balance (SSEBop) model for establishing model boundary limits for the dry/bare and wet/vegetated surface conditions. The inverse of the constant (1/spc) represents the temperature difference (dT) between the bare/dry surface and the air temperature at the canopy level. The main output of the SSEBop model is an ET fraction (0-1) and, when combined with reference (“maximum”) ET, produces an actual ET estimate from satellite-observed land surface temperature. This dT is determined using net radiation inputs under gray-sky radiations from the ERA-5 datasets, i.e., Surface Solar Radiation Downwards instead of clear-sky assumptions used for the previous dT versions. The dT estimates are adjusted for elevation effects using established equations. |
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| identifier | http://datainventory.doi.gov/id/dataset/USGS_623a0aecd34e915b67cddd21 |
| keyword |
[
"ET modeling",
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"USGS:623a0aecd34e915b67cddd21",
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| modified | 2022-04-06T00:00:00Z |
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| spatial | 179.9906, -89.0207, -180.0000, 83.6922 |
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| title | Global gray-sky dT: the inverse of the surface psychrometric constant parameter in the SSEBop evapotranspiration model |
