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Derivation of 2m Temperatures
2m temperature is a diagnostic, not a direct output from the atmospheric model. Forecast screen level variables are not directly evaluated but are determined via knowledge of the the lowest model level temperature (at 10m) and the "skin" temperature of the underlying surface. In turn the skin temperature is determined via the land surface scheme HTESSEL, or the lake surface scheme FLake, or the sea-surface temperature (through NEMO). Temperatures at 2m are then derived by interpolation between the forecast 10m temperature and the forecast surface skin temperature.
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Note urban and heat island effects are not currently represented in HTESSEL. Users should assess the potential for deficiencies in low-level parameters and adjust as necessary.
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(Note: In older material there may be references to issues that have subsequently been addressed)
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