Calculates latent heat flux from a lake surface using the bulk aerodynamic method. Flux is capped at zero — only evaporative loss from the water is retained (condensation is excluded).
Usage
latent_heat_flux(
Ts,
wndspd,
prvapr,
prsttn = 981.9,
Ce = 0.0013,
rho_air = 1.168,
Lv = 2453000
)Arguments
- Ts
Numeric. Water surface temperature (°C).
- wndspd
Numeric. Wind speed (m/s).
- prvapr
Numeric. Air vapour pressure (hPa).
- prsttn
Numeric. Atmospheric pressure (hPa). Default 981.9.
- Ce
Numeric. Bulk transfer coefficient (Dalton number). Default 0.0013.
- rho_air
Numeric. Air density (kg/m³). Default 1.168.
- Lv
Numeric. Latent heat of vaporisation (J/kg). Default 2453000.
Details
The flux is calculated as: $$Q_{lh} = \min\!\left(\frac{0.622}{P}\,C_e\,\rho_{air}\,L_v\,U\,(e_a - e_s),\ 0\right)$$
where \(e_s\) is the saturation vapour pressure at the water surface
computed by sat_vapour_pressure.