Global Change Master Directory (GCMD)

Data Sets

Services / Tools

Ancillary Descriptions

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

Fluid permeability measurements taken on vertical component of sea ice during the SIPEX II voyage of the Aurora Australis, 2012

Entry ID: SIPEX_II_Fluid_Permeability

[ Get Data ]
[ Update this Record ]

Summary

Abstract: A 9 cm diameter Kovacs corer was used to drill holes partially through the ice. The core was removed, creating a pressure head in the hole. Packers made of ABS tubing wrapped with foam to create a tight seal were inserted into the holes to block the horizontal component of flow. A "Levelogger", which is a pressure transducer for monitoring well-water, created by Solinst, was then inserted into ... each hole to record the change in water level over time. Each Levelogger was fitted into a plastic holder to keep it upright during measurement, which is a requirement for accurate data from the device. The temperature at the bottom of the core was measured immediately after removal, and the bottom 2 centimetres were removed for melting and subsequent measurement of salinity. The measurements of salinity and temperature enable calculation of the brine volume fraction. Solinst Levelogger software was then used to compensate for local barometric changes recorded using a Solinst Barologger. Following each measurement an auger was used to drill through the bottom of each hole to measure the ice thickness and freeboard in each hole.

A full core was taken at each worksite for crystallographic study, immediately adjacent to where permeability measurements were taken. A temperature profile was taken on each of these cores immediately after extraction. Cores were then moved to a -20 degree C cold room for further processing. 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 polarised plates and photographed. Each photo was labelled with the core and date it was taken, and was photographed with a meter stick 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.

Recorded values required to determine permeability are contained within the Master_Core_List.xls Excel spreadsheet, found in the Permeability worksheet. This worksheet is generated directly from notebook data, and contains the date, start and end time for each permeability record, the core number assigned, the depth of the partial sackhole, the levelogger serial number used, the station (site), the temperature 2cm from the bottom of the removed core, the bulk salinity from the bottom 2cm of the removed core, as well as the measured freeboard and thickness at each site. This worksheet also contains a column to indicate which crystal structure the crystallographic core taken from this site and depth had, as well as which crystallographic core this came from. Finally, the worksheet contains notes, and a column to indicate whether we believe this data is somehow bad. Please see the notes section for reasons why a data point was determined invalid. Typically was due to heavy rafting beneath the flow or too quick an influx of water to properly measure.

All permeability data can be found both in the original binary .xle format used by Solinst levelogger software, as well as exported into comma separated value (CSV) files. These files are located in the datalogger_data directory. Binary files are contained in the raw folder, organised into sub folders by station number. The CSV files are located in the csv folder, again organised into sub folders by station number.

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.

Scans of the original notebooks from which the Permeability worksheet were created are provided in the scanned_notebook directory.

Related URL

Link: GET DATA

Description: Download point for the data

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -64.39

S: -64.45

E: 120.25

W: 119.93

N: -64.88

S: -64.96

E: 121.03

W: 120.9

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: 2012-09-26

Stop Date: 2012-09-26

Start Date: 2012-10-03

Stop Date: 2012-10-03

Start Date: 2012-10-06

Stop Date: 2012-10-06

Start Date: 2012-10-13

Stop Date: 2012-10-13

Start Date: 2012-10-19

Stop Date: 2012-10-19

Start Date: 2012-10-28

Stop Date: 2012-10-28

Location Keywords

OCEAN > SOUTHERN OCEAN

CONTINENT > ANTARCTICA

GEOGRAPHIC REGION > POLAR

Science Keywords

CRYOSPHERE > SEA ICE

CRYOSPHERE > SEA ICE > ICE TEMPERATURE

ISO Topic Category

OCEANS

Platform

R/V AA > R/V Aurora Australis

Quality Please see the Permeability worksheet in the Master_Permeability.xls spreadsheet for individual data points marked bad, as well as notes regarding why they were bad. In general, these data points were marked bad for one of three reasons.

The first occurred when the sack hole was drilled too deep. Within the bottom few centimetres of ice the ice became too permeable to block the ...

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

Permeability

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: 31 MB

Distribution Format: csv

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

(Click to view more)

Creation and Review Dates

DIF Creation Date: 2013-01-18

Last DIF Revision Date: 2013-01-22

Reformat as FGDC document

View Text Only Format

[ Update this Record ]