pyrcel.activation.lognormal_activation¶
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pyrcel.activation.
lognormal_activation
(smax, mu, sigma, N, kappa, sgi=None, T=None, approx=True)¶ Compute the activated number/fraction from a lognormal mode
Parameters: - smax : float
Maximum parcel supersaturation
- mu, sigma, N : floats
Lognormal mode parameters;
mu
should be in meters- kappa : float
Hygroscopicity of material in aerosol mode
- sgi :float, optional
Modal critical supersaturation; if not provided, this method will go ahead and compute them, but a temperature
T
must also be passed- T : float, optional
Parcel temperature; only necessary if no
sgi
was passed- approx : boolean, optional (default=False)
If computing modal critical supersaturations, use the approximated Kohler theory
Returns: - N_act, act_frac : floats
Activated number concentration and fraction for the given mode