Cumulus Cloud Model - Rain Formation in Warm Clouds: General Systems Theory - page 36

(2.3)

C
L

C
L

p p

q = θ = θ * fz qfz = ,

t *

where q ∗ is the production of LWC at the cloud-base level and is equal to C p θ ∗ / L .
The total cloud LWC q t profile follows the fz distribution (Fig. 1.5).

2.1.5.1 Cloud-Growth Time

The large eddy-growth time (Eq. 1.36) can be used to compute cloud-growth time
T c :

(2.4)

r
w

π
2

z

*

T = li (), z

2

c

z

1

*

where li is the Soldner's integral or the logarithm integral. The cloud growth time T c
using Eq. (2.4) is shown in Fig. 2.1 .

2.2 Cloud Model Predictions and Comparison

with Observations

Numerical computations of cloud parameters were performed for two different
cloud-base cloud condensation nuclei (CCN) mean volume radii, namely 2.2 and
2.5 µm, and computed values are compared with the observations. The results are
discussed below.