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The NCEP/NCAR Reanalyses provides diabatic heating components, with unit K/s. Is this heating the tendency of the POTENTIAL temperature, or just of temperature itself?

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The NCEP/NCAR Reanalyses provides diabatic heating components, with unit K/s. Is this heating the tendency of the POTENTIAL temperature, or just of temperature itself?

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[Jan, 1999] The diabatic heating (K/s) is the temperature tendancy and not the potential temperature tendancy. • How is the PV (potential vorticity) on the theta surface computed? [Jan 1999] The PV is first interpolated to theta surfaces and then the PV is calculated. • How are 2 meter temperatures derived?[Feb 1999] Please contact Hua-Lu Pan at NCEP. • How is 4LFTXsfc computed?[Jun 1999] The Best Lifted Index is computed by finding the parcel with the warmest equivalent potential temperature. Then raising it to 500mb and subtracting its parcel temperature from the environment temperature. • How are SW radiative fluxes derived?[Jun 1999] The SW parameterization used is obtained from GFDL. The clear sky part is from Lacis and Hansen, 1974, JAS. The SW fluxes are broad band fluxes over the solar spectrum from 0.2-4.0 microns. • Is the concentration of CO2 constant throughout the reanalysis or is it changing according to some measurements? what is the concentration used? The model used ha

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