Environmental Engineering Reference
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Figure 3. Chart of isophases (deg) for the M2 wave in the Arctic Ocean.
Similarly, for the same ground-based gauge observational data, the mean absolute error
as applied to tidal sea surface level elevation amplitudes (
O and
N
1
O
M
, where
n
n
n
M
are observed and model values of the amplitude at the n-th measurement station), as
n
) (
)
(
s
/
s s
well as the linear correlation (
, where
1
,
s
=
N
OOMM
OM
O
M
OM
n
n
n
(
)
(
)
1
O
=
N
O
1
1
,
s
=
N
M
M
,
,
s
=
N
OO
n
M
n
O
n
n
n
n
)
(
(
)
1
1
M
=
N
M
N
M
O
),
the
bias
and
the
scatter
index
n
n
n
n
n
(
)
1
2
are 4.8 cm, 0.9899, 2.03 cm and 0.2980 for our model, whereas
N
M
O
/
O
n
n
n
for the Fairbanks University model and the Oregon State University model they are 6.55 cm,
0.9308, -0.02 cm, 0.4275 and 2.49 cm, 0.9922, -1.64 cm, 0.1426, respectively. We see that
our estimates are again generally better than those derived from the Fairbanks University
model and worse than those derived from the Oregon State University model. The reason for
this has already been indicated.
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