sigma_to_pressure#

metpy.calc.sigma_to_pressure(sigma, pressure_sfc, pressure_top)#

Calculate pressure from sigma values.

Parameters

  • sigma (ndarray) – Sigma levels to be converted to pressure levels

  • pressure_sfc (pint.Quantity) – Surface pressure value

  • pressure_top (pint.Quantity) – Pressure value at the top of the model domain

Returns

pint.Quantity – Pressure values at the given sigma levels

Notes

Sigma definition adapted from [Philips1957]:

\[p = \sigma * (p_{sfc} - p_{top}) + p_{top}\]

  • \(p\) is pressure at a given sigma level

  • \(\sigma\) is non-dimensional, scaled pressure

  • \(p_{sfc}\) is pressure at the surface or model floor

  • \(p_{top}\) is pressure at the top of the model domain

Changed in version 1.0: Renamed psfc, ptop parameters to pressure_sfc, pressure_top

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