<s>
CLaMS	B-Application
(	O
Chemical	O
Lagrangian	O
Model	O
of	O
the	O
Stratosphere	O
)	O
is	O
a	O
modular	O
chemistry	O
transport	O
model	O
(	O
CTM	O
)	O
system	O
developed	O
at	O
Forschungszentrum	O
Jülich	O
,	O
Germany	O
.	O
</s>
<s>
CLaMS	B-Application
was	O
first	O
described	O
by	O
McKenna	O
et	O
al	O
.	O
</s>
<s>
CLaMS	B-Application
has	O
been	O
employed	O
in	O
recent	O
European	O
field	O
campaigns	O
THESEO	O
,	O
EUPLEX	O
,	O
TROCCINOX	O
SCOUT-O3	O
,	O
and	O
RECONCILE	O
with	O
a	O
focus	O
on	O
simulating	O
ozone	O
depletion	O
and	O
water	O
vapour	O
transport	O
.	O
</s>
<s>
SLIMCAT	B-Application
,	O
REPROBUS	O
)	O
,	O
CLaMS	B-Application
operates	O
on	O
a	O
Lagrangian	O
model	O
grid	O
(	O
see	O
section	O
about	O
model	O
grids	O
in	O
general	B-Application
circulation	I-Application
model	I-Application
)	O
:	O
an	O
air	O
parcel	O
is	O
described	O
by	O
three	O
space	O
coordinates	O
and	O
a	O
time	O
coordinate	O
.	O
</s>
<s>
The	O
time	O
evolution	O
path	O
that	O
an	O
air	O
parcels	O
traces	O
in	O
space	O
is	O
called	O
a	O
trajectory	B-Application
.	O
</s>
<s>
trajectories	B-Application
in	O
regions	O
of	O
high	O
wind	O
shear	O
.	O
</s>
<s>
CLaMS	B-Application
operates	O
on	O
arbitrarily	O
resolved	O
horizontal	O
grids	O
.	O
</s>
<s>
CLaMS	B-Application
is	O
composed	O
of	O
four	O
modules	O
and	O
several	O
preprocessors	O
.	O
</s>
<s>
Integration	O
of	O
trajectories	B-Application
with	O
4th	O
order	O
Runge-Kutta	B-Algorithm
method	I-Algorithm
,	O
integration	O
time	O
step	O
30	O
minutes	O
.	O
</s>
<s>
Vertical	O
displacement	O
of	O
trajectories	B-Application
is	O
calculated	O
from	O
radiation	O
budget	O
.	O
</s>
<s>
To	O
initialize	O
the	O
chemical	O
fields	O
in	O
CLaMS	B-Application
,	O
data	O
from	O
a	O
large	O
variety	O
of	O
instruments	O
have	O
provided	O
data	O
.	O
</s>
