<s>
HadCM3	B-Application
(	O
abbreviation	O
for	O
Hadley	O
Centre	O
Coupled	O
Model	O
,	O
version	O
3	O
)	O
is	O
a	O
coupled	O
atmosphere-ocean	O
general	B-Application
circulation	I-Application
model	I-Application
(	O
AOGCM	B-Application
)	O
developed	O
at	O
the	O
Hadley	O
Centre	O
in	O
the	O
United	O
Kingdom	O
.	O
</s>
<s>
Unlike	O
earlier	O
AOGCMs	B-Application
at	O
the	O
Hadley	O
Centre	O
and	O
elsewhere	O
(	O
including	O
its	O
predecessor	O
HadCM2	O
)	O
,	O
HadCM3	B-Application
does	O
not	O
need	O
flux	O
adjustment	O
(	O
additional	O
"	O
artificial	O
"	O
heat	O
and	O
freshwater	O
fluxes	O
at	O
the	O
ocean	O
surface	O
)	O
to	O
produce	O
a	O
good	O
simulation	O
.	O
</s>
<s>
The	O
higher	O
ocean	O
resolution	O
of	O
HadCM3	B-Application
is	O
a	O
major	O
factor	O
in	O
this	O
;	O
other	O
factors	O
include	O
a	O
good	O
match	O
between	O
the	O
atmospheric	O
and	O
oceanic	O
components	O
;	O
and	O
an	O
improved	O
ocean	O
mixing	O
scheme	O
(	O
Gent	O
and	O
McWilliams	O
)	O
.	O
</s>
<s>
HadCM3	B-Application
has	O
been	O
run	O
to	O
produce	O
simulations	O
for	O
periods	O
of	O
over	O
a	O
thousand	O
years	O
,	O
showing	O
little	O
drift	O
in	O
its	O
surface	O
climate	O
.	O
</s>
<s>
HadCM3	B-Application
is	O
composed	O
of	O
two	O
components	O
:	O
the	O
atmospheric	O
model	O
HadAM3	B-Application
and	O
the	O
ocean	O
model	O
HadOM3	O
(	O
which	O
includes	O
a	O
sea	O
ice	O
model	O
)	O
.	O
</s>
<s>
HadAM3	B-Application
is	O
a	O
grid	O
point	O
model	O
that	O
has	O
a	O
horizontal	O
resolution	O
of	O
3.75	O
×	O
2.5	O
degrees	O
in	O
longitude	O
×	O
latitude	O
.	O
</s>
<s>
Near	O
the	O
poles	O
,	O
fields	O
are	O
fourier-filtered	O
to	O
prevent	O
instabilities	O
due	O
to	O
the	O
CFL	B-Algorithm
criterion	O
.	O
</s>
<s>
This	O
is	O
the	O
model	O
behind	O
PRECIS	O
(	O
Providing	O
Regional	O
Climates	O
for	O
Impacts	O
Studies	O
)	O
as	O
well	O
as	O
being	O
the	O
atmosphere	O
component	O
of	O
the	O
distributed	B-Architecture
computing	I-Architecture
project	O
Climateprediction.net	B-Operating_System
.	O
</s>
