Global gray-sky dT: the inverse of the surface psychrometric constant parameter in the SSEBop evapotranspiration model
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.
Resources
| Name |
Format |
Description |
Link |
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55 |
Landing page for access to the data |
https://doi.org/10.5066/P9JBW6R9 |
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55 |
The metadata original format |
https://data.usgs.gov/datacatalog/metadata/USGS.623a0aecd34e915b67cddd21.xml |
Tags
- climatologymeteorologyatmosphere
- usgs-623a0aecd34e915b67cddd21
- air-temperature
- geoscientificinformation
- net-radiation
- et-modeling
- ssebop-model
- psychrometric-constant