Geology Reference
In-Depth Information
Growth rate
ν
×
10
-
5
(cm/s)
0.8
1. 0
1. 2
1. 4
1. 6
1. 8
2.0
9
0.25
8
7
0.20
6
5
0.15
20 < No. OF. DATA
15 < No. OF. DATA ≤ 20
10 < No. OF. DATA ≤ 15
No. OF. DATA ≤ 10
4
0.10
3
2
0.6
0.8
1. 0
1.2
1. 4
1. 6
1.8
Growth rate
ν
×
10
-
5
(cm/day)
Figure 3.11
Plots of stable salinity of each 25 mm segment of curve
a
versus corresponding growth rate of curve
b
of Figure 3.10 for columnar‐grained ice at depths between 0.25 and 1.25 m. The number of segment salinities avail-
able for determining each salinity value is shown. Solid line represents equation (2.32), giving /
D
42 10
4
s/cm
.
and
K
0
= 0.12 [
Nakawo and Sinha,
1981].
26 OCT
1 MAY
1 NOV1 DEC
1 JAN1 FEB
1 MAR
1 APR
0
-10
Stable salinity s (‰)
-20
0
5
10
-30
0
-40
High salinity
high growth rate
cold period
50
Low salinity
slow growth rate
warm period
100
Theoretical
150
200
Figure 3.12
Composite diagram of stable salinity profile, temporal variation of daily mean air temperature and
growth history of the ice (observed and calculated). High salinity is related to high growth that corresponds to
colder periods. Warmer days slowed the growth of ice, resulting in lower salinity. Open and solid circles are
measured and calculated ice thicknesses, respectively. The dashed line is an “eye‐fit“ to the observed thickness
data and the solid line is based on theory. Both indicate ice growth rate [
Nakawo and Sinha,
1981].
