Current,Température and Salinity Observations in the Terra Nova Bay
167
Table 1. Type, range and accuracy of the CTD sensors
Parameter
Type of sensor
Range
Accuracy/stability
Température
SBE3/F
-5 to +35°C
±0.002 °C/year
Conductivity
SBE4
0.0 to 7 S/m
±0.0003 S/m/month
Pressure
Paroscientific
0 to 10.000 psi
±1.5 psi
Oxygen
SBE 13Y
0 to 15 ml/1
±0.1 ml/1
Light transmission Sea Tech 25 cm
0 to 100%
±0.5%
Fluorescence
Acquatracka III
0.01 to 100 mg/1 ±0.01 mg/1
pH
Distance
SBE18
Oto 14
±0.1
from bottom
Datasonic PSA-900
0 to 300 m
±0.75 cm
ature and 0.00095 S/m for conductivity were applied to the raw data. The mooring was composed of five Eulerian current métrés (Aanderaa RCM7) (Table 2)
with température and conductivity sensors, two sedimentary traps and a turbidimeter. The upper current meter was 55 m below the sea surface, the deepest
at about 30 m from the bottom. The initial and final records of the température
and conductivity time sériés were compared with CTD data collected near the
mooring position during February and December 1995, without finding significant différences. Unfortunately some salinity sensors were found broken; as a
conséquence it was not possible to investigate the salinity changes over the water
column from 55 to 800 m.
The current data were rotated to align the v-component with the local isobath.
In this way, the major energy was présent in this component. Data were low-pass
filtered and daily resampled; reported températures are in-situ data.
3 Distribution of Water Masses in the Ross Sea
During Summer 1995
The Terra Nova Bay bottom topography is made up of a deep pit, reaching more
than 1100 m, bounded approximately by the 500-m isobath. The Southern end of
this pit is open toward the Ross Ice Shelf by a sill deeper than 600 m. In general,
the Ross Sea continental shelf is characterised by a high variable bathymetry and
by the presence of many banks.
Table 2. Mooring details
Depth Current
Thermistor
Conductivity
(m)
meter Type
Accuracy
Cell
Accuracy
55
RCM7 Seacat SBE3
±0.01 °C/6 months -
140 RCM7
Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month
402 RCM7 Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month
748 RCM7
Seacat SBE3
±0.01°C/6 months Seacat SBE4
±0.001 S/m/month
882 RCM7
Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month
167
Table 1. Type, range and accuracy of the CTD sensors
Parameter
Type of sensor
Range
Accuracy/stability
Température
SBE3/F
-5 to +35°C
±0.002 °C/year
Conductivity
SBE4
0.0 to 7 S/m
±0.0003 S/m/month
Pressure
Paroscientific
0 to 10.000 psi
±1.5 psi
Oxygen
SBE 13Y
0 to 15 ml/1
±0.1 ml/1
Light transmission Sea Tech 25 cm
0 to 100%
±0.5%
Fluorescence
Acquatracka III
0.01 to 100 mg/1 ±0.01 mg/1
pH
Distance
SBE18
Oto 14
±0.1
from bottom
Datasonic PSA-900
0 to 300 m
±0.75 cm
ature and 0.00095 S/m for conductivity were applied to the raw data. The mooring was composed of five Eulerian current métrés (Aanderaa RCM7) (Table 2)
with température and conductivity sensors, two sedimentary traps and a turbidimeter. The upper current meter was 55 m below the sea surface, the deepest
at about 30 m from the bottom. The initial and final records of the température
and conductivity time sériés were compared with CTD data collected near the
mooring position during February and December 1995, without finding significant différences. Unfortunately some salinity sensors were found broken; as a
conséquence it was not possible to investigate the salinity changes over the water
column from 55 to 800 m.
The current data were rotated to align the v-component with the local isobath.
In this way, the major energy was présent in this component. Data were low-pass
filtered and daily resampled; reported températures are in-situ data.
3 Distribution of Water Masses in the Ross Sea
During Summer 1995
The Terra Nova Bay bottom topography is made up of a deep pit, reaching more
than 1100 m, bounded approximately by the 500-m isobath. The Southern end of
this pit is open toward the Ross Ice Shelf by a sill deeper than 600 m. In general,
the Ross Sea continental shelf is characterised by a high variable bathymetry and
by the presence of many banks.
Table 2. Mooring details
Depth Current
Thermistor
Conductivity
(m)
meter Type
Accuracy
Cell
Accuracy
55
RCM7 Seacat SBE3
±0.01 °C/6 months -
140 RCM7
Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month
402 RCM7 Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month
748 RCM7
Seacat SBE3
±0.01°C/6 months Seacat SBE4
±0.001 S/m/month
882 RCM7
Fenwall GB32JM19 ±0.05°C
Inductive 2994 ±0.01 S/m/month