DerivedVPD

GlobalNVIDIAPyTorch

Import path: earth2studio.models.dx.DerivedVPD

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Documentation

Bases: Module

Calculates the Vapor Pressure Deficit (VPD) in hPa from relative humidity and temperature fields. The calculation is based on the formula:

VPD = es * ((100 - rh) / 100)

The variable es is the saturation vapor pressure calculated using the formula:

es = 6.11 * exp((L / Rv) * ((1 / 273) - (1 / T)))

where L is the latent heat of vaporization (2.26e6 J/kg), Rv is the gas constant for water vapor (461 J/kg/K).

Note

For additional information on the VPD calculation in millibars, please refer to:

• Dennis Hartman "Global Physical Climatology" (p 350)
• www.sciencedirect.com/book/9780123285317/global-physical-climatology

Parameters:

• levels (list[int | str], default: [100] ) –

  Pressure / height levels to compute VPD for. The resulting expected input fields are temperature and relative humidity pairs for each level. E.g. for level 100 the input fields should be [t100, r100], by default [100]

__call__

__call__(
    x: Tensor, coords: CoordSystem
) -> tuple[Tensor, CoordSystem]

Forward pass of diagnostic