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DC Conductivity of sea-ice measured during the SIPEX II voyage of the Aurora Australis, 2012

Entry ID: SIPEX_II_Ice_Conductivity

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Summary

Abstract: DC Electrical:

In order to relate the fluid permeability to the electrical properties of sea ice, we also took measurements of the vertical component of the DC electrical conductivity tensor of sea ice. Cores extending to the bottom of an ice floe were taken and laid out holder. With the exception of sites 7 and 8 where we encountered a slush layer below the hard ice and could not core down to ... the ocean. The core bottom was determined at sites 7 and 8 to be the ice slush interface. Immediately upon extraction, holes that fit our thermistor probes were drilled every ten centimetres and a temperature profile was taken. Subsequently, slightly larger holes were drilled which fit our electrical probes (stainless steel nails). An AEMC Earth Resistivity Meter was then used to measure the resistance over 10 cm sections of the core (usually offset by 5 cm so that the measured temperature was in the centre of the section where electrical resistance was measured).

The cores used in resistance measurements were taken very close to where the crystallographic cores were taken. In almost all cases the cores extracted for electrical measurements were also used for crystallographic analysis, so that there was an exact match of electrical properties with crystal structure. In such cases the DC electrical cores were then moved to a -20 degree C cold room for further processing immediately after measurements in the field.

A thin vertical section, approximately 3mm thick, was taken from each of the cores stored for analysis. These sections were placed between a pair of cross polarized plates and photographed. Each photo was labelled with the core and date it was taken, and was photographed with a meter stick alongside for scale.

After the thin sections were photographed, the remaining samples were melted to measure salinity. Some of the melted sea ice was saved for later O18 analysis to distinguish samples containing snow ice from those containing marine granular ice. The temperature and salinities we are then used to calculate brine volume fractions along the 10 cm sections of the core.

The DC conductivity data collected can be found in the Electrical tab of the Master_Core_List.xls Excel file. The raw data can be found in the scans of our field note books located in the folder named notebooks. In the spread sheet the measured resistances of the 10 cm sections, temperatures, salinities and corresponding brine volume fractions are listed per core.

For each core the supporting crystallography core number can be found in the crystallography column of the spread sheet. The photos of the crystallography cores can be found in the crystallography folder, separated into subfolders labelled with the site and core number, Each photo also contains a tag indicating the core number , site taken , date, and what depth range this covers. Tags may not contain a depth range for cores less than 1 meter. Please see the meter stick in each photo for scale.

Related URL

Link: GET DATA

Description: Download point for the data

Geographic Coverage

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Spatial coordinates

N: -65.08

S: -65.13

E: 121.67

W: 120.63

N: -65.26

S: -65.29

E: 120.08

W: 119.93

N: -65.14

S: -65.26

E: 119.0

W: 118.32

N: -64.68

S: -64.87

E: 116.83

W: 115.71

Parent DIF

This data set description is a member of a collection. The collection is described in
SIPEX_II

Temporal Coverage

Start Date: 2012-10-06

Stop Date: 2012-10-06

Location Keywords

OCEAN > SOUTHERN OCEAN

CONTINENT > ANTARCTICA

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > SALINITY/DENSITY > CONDUCTIVITY

CRYOSPHERE > SEA ICE

OCEANS > SEA ICE

ISO Topic Category

OCEANS

Platform

R/V AA > R/V Aurora Australis

Quality For the moment the spread sheet contains an ice type column which only allows for a statement of granular or columnar ice for each 10 cm section. At 10 cm resolution one can have a mix of the two. Exactly how we will quantify each section with a mix if ice types is yet to be determined and as such this data set will change as the photos are analysed in greater detail.

Access Constraints These data are not yet publicly available.

Use Constraints This data set conforms to the PICCCBY Attribution License
(http://creativecommons.org/licenses/by/3.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIPEX_II... when using these data.

Ancillary Keywords

SIPEX

Conductivity

Data Set Progress

IN WORK

Originating Center

Australian Antarctic Division

Data Center

Australian Antarctic Data Centre, Australia

Data Center URL: http://data.aad.gov.au

Data Center Personnel
Name: DATA OFFICER AADC Phone: +61 3 6232 3244 Fax: +61 3 6232 3351 Email: metadata at aad.gov.au Contact Address: Australian Antarctic Division 203 Channel Highway City: Kingston Province or State: Tasmania Postal Code: 7050 Country: Australia

Distribution

Distribution Media: HTTP

Distribution Size: 76 kb

Distribution Format: Excel

Fees: Free

Personnel

KENNETH M GOLDEN

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Role: DIF AUTHOR

Email: golden at math.utah.edu

Contact Address:

University of Utah

Department of Mathematics

155 S. 1400 E. JWB 233

City: Salt Lake City

Province or State: Utah

Postal Code: 84112-0090

Country: USA

DAVID LUBBERS

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Email: david.lubbers at utah.edu

Contact Address:

University of Utah

City: Salt Lake City

Province or State: Utah

Postal Code: 84112-0090

Country: USA

CHRISTIAN SAMPSON

Role: INVESTIGATOR

Role: TECHNICAL CONTACT

Email: christian.sampson at gmail.com

Contact Address:

University of Utah

City: Salt Lake City

Province or State: Utah

Postal Code: 84112-0090

Country: USA

Extended Metadata Properties

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Creation and Review Dates

DIF Creation Date: 2013-01-18

Last DIF Revision Date: 2013-01-18

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