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

Data Set Citation

Dataset Originator/Creator: UNEP/GRID-Arendal

Dataset Title: BALANS Wetlands

Dataset Publisher: UNEP/GRID-Arendal

Data Presentation Form: GIS map

Online Resource: http://www.grida.no/baltic/htmls/related.htm

Temporal Coverage

Start Date: 1997-07-11

Stop Date: 2000-09-19

Location Keywords

OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > BALTIC SEA

CONTINENT > EUROPE > EASTERN EUROPE > BELARUS

Science Keywords

BIOSPHERE > TERRESTRIAL ECOSYSTEMS > WETLANDS

BIOSPHERE > VEGETATION

ISO Topic Category

BIOTA

BOUNDARIES

Platform

IRS-1C > Indian Remote Sensing Satellite-1C

Project

BALANS > Land Cover Information for the Baltic Sea Drainage Basin

Access Constraints Free access, unrestricted

Ancillary Keywords

GIS

Wetlands ecosystems

Data Set Progress

COMPLETE

Originating Center

Data Center

Global Resource Information Database - Arendal, United Nations Environment Programme

Data Center URL: http://www.grida.no/

Data Center Personnel
Name: SINDRE LANGAAS Phone: +46-8-16 20 00 Fax: +46-8-16 20 00 Email: langaas at grida.no Contact Address: UNEP/GRID-Arendal c/o Dept. of Systems Ecology Stockholm University City: Stockholm Postal Code: s-106 91 Country: Sweden

Distribution

Distribution Media: Online/CD-ROM

Distribution Size: 185 KB

Distribution Format: ArcInfo GRID, ArcView Spatial Analyst

Fees: No fees

Distribution Media: Online/CD-ROM

Distribution Size: 184 KB

Distribution Format: ERDAS IMG

Fees: No fees

Personnel

TYLER B. STEVENS

Role: DIF AUTHOR

Phone: (301) 614-6898

Fax: 301-614-5268

Email: Tyler.B.Stevens at nasa.gov

Contact Address:

NASA Goddard Space Flight Center

Global Change Master Directory

City: Greenbelt

Province or State: MD

Postal Code: 20771

Country: USA

Creation and Review Dates

DIF Creation Date: 2003-06-24

Last DIF Revision Date: 2006-05-26

Reformat as FGDC document

View Text Only Format

[ Update this Record ]