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 meterskappa : 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 passedT : float, optional
Parcel temperature; only necessary if no
sgi
was passedapprox : 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