Ecoinformatics Problems of Global Climate Change - New Ecoinformatics Tools in Environmental Science: Applications and Decision-making - page 481

V is ¼ K is C s ; i ¼ 1 ; 2

cient of proportionality K is can be function of time and space coor-
dinates and depends on the physical state of the surface. With the use of the
identi

The coef

er || ʼ ij || this dependence can be broadened. For instance, the version ʼ ij =0

can mean that the dry deposition in the model is neglected at all. For ʼ ij = 1 the

scheme proposed in [128] is taken into account]:
K 2s ¼ K 2s v ds d H mix t ; u; k

ð Þ;

where K 2s cient of proportionality, v ds is the rate of deposition of the s-th

type of aerosol (e.g., v ds = 0.008 m s − 1 for SO 2 , 0.002 m s − 1 for SO 4 , 0.001 m s − 1
for NO 2 and HNO 3 ), H mix is the height of the atmospheric mixed layer (m), d is the
parameter considering the physical state of the surface (d = 1 for dry surface, d =2
for wet surface, etc.).
With the use of the

is the coef

ʼ ij parameter the system of modeling can govern the choice
of various dependences of the rate of dry deposition in a wide range of synoptic
parameters and other environmental characteristics contained in the base of
knowledge. For instance, for

ʼ ij = 2 the following model is chosen:

(

0 : 002U for L 0 ;

h i

v 2s ¼ 2 = 3

:

1 þ 300

ð = Þ ;

0 002U L for L \ 0

where L is the (Monin-Obukhov length), U * is the rate of friction.
By analogy with the previous case, in modeling the rate of wet deposition of
aerosols from the atmosphere, it is expedient to consider the problem from different
positions, since in general, the v 1s value is the function of many factors, some of
them not always being estimated reliably. For convenience of computer modeling,
the identi er ||v ij || is introduced and, for instance, for v ij = 0 we assume automat-

ically v 1s = 0 (no washing out). For v ij = 1 there is a version when

v 1s ¼ K 2s C s r ;

where r is the rain rate.
With v ij = 2 we have the model of washing out:

@

C s =@ t ¼ /

ð ; u; k Þ C s t ð ; u; k; Þ

rt h

At ˕ = const we obtain a simple explicit scheme of C s recalculation in each cell:

¼ C s t exp / D

C s t þ D t ; u i ; k j ; h k ; u i ; k j ; h k rt ; u; i ; k j ; t