The maximum extent of sea ice in the southern hemisphere by day and by winter season
Entry ID:
sea_ice_extent_winter
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Summary
These data give the maximum extent of sea ice in the southern hemisphere by day and by winter season. Data cover the 1979/1980 to 2007/2008 seasons.
The data are available in csv files.
Related URL
Link:
GET DATA
Description:
Download point for the seasonal data - csv file
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Geographic Coverage
Spatial coordinates
| N: -52.46 |
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S: -67.76 |
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E: 180.0 |
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W: -179.0 |
Temporal Coverage
Start Date:
1978-10-26
Stop Date:
2009-05-16
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Location Keywords
Science Keywords
ISO Topic Category
Platform
Instrument
Quality
Methods
Sea ice extents were calculated from passive microwave estimates of mean sea ice concentration (Cavalieri et al., 1996 updated 2008; Meier et al., 2006 updated quarterly).
Seasonal maximum extent
A season was considered to extend from the 1st of July of one year to 30th of June of the next. The extent of sea ice for a season was computed by ... searching for all pixels that were covered by at least 15% sea ice during at least one month of the season. The maximum latitude of sea ice extent was then calculated in one-degree longitude sectors, with sectors centred on integer longitudes from 179W to 180E. Areas of open water fully enclosed within the sea ice were disregarded for the purposes of calculating maximum latitude. Isolated regions of ice lying to the north of the main ice pack were also disregarded if they were separated from the main pack by at least 2 degrees of latitude (there were only a small number of instances of this situation).
Daily maximum extent
The maximum latitude of sea ice extent was calculated from daily estimates of sea ice concentration. Due to the increased presence of false ice in daily data (compared to monthly), an additional filtering step was applied during the calculation of daily extents. This filtering removed any areas of sea ice that were isolated from the Antarctic continent and which were less than 10 pixels in extent. The maximum latitude of sea ice was then calculated along transects centred on each integer degree of longitude. The area of open water lying to the south of the ice edge was also calculated for each transect (expressed as a fraction of the total area between the ice edge and the coastline).
Access Constraints
The csv files are available for download from the URLs given below.
Use Constraints
Please follow instructions listed in the citation reference provided at the URL below when using these data.
Ancillary Keywords
Data Set Progress
Data Center
Distribution
Distribution Media:
HTTP
Distribution Size:
32 kb
Distribution Format:
csv
Fees:
Free
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Personnel
BEN
RAYMOND
Role:
INVESTIGATOR
Role:
TECHNICAL CONTACT
Phone:
+61 3 6232 3336
Fax:
+61 3 6283 2336
Email:
ben.raymond at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City:
Kingston
Province or State:
Tasmania
Postal Code:
7050
Country:
Australia
DAVE
CONNELL
Role:
DIF AUTHOR
Phone:
+61 3 6232 3244
Fax:
+61 3 6232 3351
Email:
dave.connell at aad.gov.au
Contact Address:
Australian Antarctic Division
203 Channel Highway
City:
Kingston
Province or State:
Tasmania
Postal Code:
7050
Country:
Australia
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Publications/References
Cavalieri, D., C. Parkinson, P. Gloersen, and H. J. Zwally. 1996, updated 2008. Sea ice concentrations from Nimbus-7 SMMR and DMSP SSM/I passive microwave data. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media. http://nsidc.org/data/nsidc-0051.html
Meier, W., F. Fetterer, K. Knowles, M. Savoie, M. J. Brodzik. 2006, updated quarterly. Sea ice concentrations from Nimbus-7 SMMR and DMSP SSM/I passive microwave data. Boulder, Colorado USA: National Snow and Ice Data Center. Digital media. http://nsidc.org/data/nsidc-0051.html
Creation and Review Dates
DIF Creation Date:
2009-10-02
Last DIF Revision Date:
2009-10-16
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