Brief description
This dataset contains data resulting from the measurement of brine samples extracted from the sea-ice during the 2012 SIPEX 2 (Sea Ice Physics and Ecosystems Experiment) marine science voyage. The Brine was collected from partially drilled holes in the ice using suction. In some of these cases the brine analysed came from holes which correspond to permeability measurements. In these cases a core number is associated with the brine data which will correspond to the core number in the permeability data set. Brine was also made on the ship by repeatedly freezing sea water collected from site 8. Measurements of the electrical permittivity of the brine were measured from 200MHz-4GHz with varying temperature and salinity. The measurements were carried out using the FieldFox portable network analyser from Agilent technologies along with the Agilent 85070e high temperature dielectric probe. Typically the brine was cooled and measured as the temperature changed over time once removed from a freezer. Some samples were measured before and after filtering out any biology that may have been present to see any biological effect on the electrical properties of the brine, in particular any effect extra cellular carbon may have. Measurements of the biology in the brine were performed by Sarah Ugalde please refer to the biophysical folder for further information and the data. The actual permittivity measurements can be found in the Brine_Frequency_Temp Excel file. In the file each set of measurements has its own tab. Each measurement has a temperature and salinity associated with it. For a variability study measurements were repeated on some samples in which case the tab contains the sample name as well as an index indicating which repetition the data corresponds to. For example Core 85 6 would be the 6th measurement for core 85. You will also find the Excel file Brine_Calibration_Record which logs each calibration preformed before each measurement. The calibration for a given brine measurement has the same name as that brine measurement so that they can be matched. The permittivity measurements for each frequency, salinity and temperature are given in the real (e') and imaginary part (e").Lineage
Progress Code: completed
Statement: For some of the samples the salinity was very close to that of sea water indicating that ocean water from below had made its way into the brine sample. This would most likely be a problem for the samples from site 4 as the brine was collected at the termination of the permeability experiments which last on the order of 20 min to 1 hour. For the samples at station 7 the permeability experiments were shortened in an attempt to prevent sea water from filling the hole however for deep holes this likely unavoidable. A further complication is the need for at least 1 litre of brine in order to complete the biological experiments, for deeper holes there might not be 1 litre of brine in the ice before sea water makes its way up into the hole. Brine from site 8 however was collected as it came from the partial hole at shallow depth in low quantity and should not have sea water in it. During measurement in the lab temperature was difficult to hold constant but was constantly monitored and recorded. For samples with less brine, thus covering less of the temperature probe, inaccuracy of temperature may be an issue. For salinities over 70PSU measurement had to be made by watering down a part of the sample rather than direct measurement from a salinometer.
Data time period: 2012-09-26 to 2012-11-08
text: westlimit=120.63; southlimit=-65.1336; eastlimit=121.672; northlimit=-65.0779
text: westlimit=118.3249; southlimit=-65.2643; eastlimit=119.0013; northlimit=-65.1421
text: westlimit=116.8338; southlimit=-64.8729; eastlimit=116.8338; northlimit=-64.8729
Subjects
ACE/CRC |
AMD |
AMD/AU |
Brine |
CEOS |
CONTINENT > ANTARCTICA |
EARTH SCIENCE > CRYOSPHERE > SEA ICE |
EARTH SCIENCE > CRYOSPHERE > SEA ICE > ICE ROUGHNESS |
EARTH SCIENCE > CRYOSPHERE > SEA ICE > SALINITY |
EARTH SCIENCE > OCEANS > SEA ICE |
EARTH SCIENCE > OCEANS > SEA ICE > ICE TEMPERATURE |
EARTH SCIENCE > OCEANS > SEA ICE > SALINITY |
GEOGRAPHIC REGION > POLAR |
OCEAN > SOUTHERN OCEAN |
R/V AA > R/V Aurora Australis |
Relative Permittivity |
SALINOMETERS |
SIPEX |
oceans |
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Other Information
Download point for the data (GET DATA)
Identifiers
- global : SIPEX_II_Brine_Permittivity
