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Global Change Master Directory (GCMD)
Sea Ice Mass Balance in the Antarctic - Aspect Ice Observations
Entry ID: SIMBA_Aspect_Ice_Observations


Summary
Abstract: The dataset contains manual recordings transcribed into electronic format, following the ASPeCt (Antarctic Sea Ice Processes and Climate) protocol, for inclusion in the cruise data set. Although the observations are necessarily subjective to each person's individual biases, when taken as a whole, the data set revealed some statistically valid trends in winter sea ice conditions of Western Antarctica in the Bellingshausen/Amundsen Sea.

Throughout cruise NBP07-09 a team of 9 volunteers made 192 observations of local sea ice conditions over a period of 63 days broken up into two voyages. The protocol used was devised by the ASPeCt working group of the Scientific Committee of Antarctic Research (SCAR). This data set was supplemented by estimates of the number of icebergs.

This process entailed making qualitative observations every hour (GMT) of sea ice conditions, weather, and iceberg conditions from the bridge of the RVIB Nathaniel B. Palmer and recording them onto the ASPeCt standard log sheets. The observations included recording the latitude, longitude, overall sea ice concentration, and conditions for the primary, secondary, and tertiary ice types observed. The ice type descriptions incorporated the concentration of each ice type with regards to the overall concentration, ice type, ice thickness, floe size, topography, snow cover, and snow depth. The air/water temperature, wind speed, and direction were recorded from the vessel?s underway data acquisition system (DAS). NOAA's meteorological observation weather codes were used to identify the weather conditions for precipitation and visibility. Observations incorporated ice conditions within 1km from the ship per the ASPeCt protocol, and used radar images to estimate approximate icebergs within 6 nautical miles. In order to help determine the scale of ice thickness, an inflatable ball 0.5 meters in diameter was installed on the starboard side of the ship to gauge ice thickness more accurately as an ice piece was being turned on edge by the ship. Additionally, two time lapse cameras were installed with a 5 second shutter speed to help capture the ice conditions from the starboard side and the ice tower. Ultimately night observations were made by the light emitted from the ship at a range of a few tens of meters.


Purpose: ASPeCt is an expert working group of the SCAR whose aim is to help improve and standardize understanding of the Antarctic sea ice zone through ongoing field programs, remote sensing and numerical modeling. Towards the end of the cruise as the spring season was approaching, the ice edge seemed to retreat per images transmitted from radar images such as Radarsat and Envisat. With these resources, and the ASPeCt observations, we can determine preliminary ice conditions for this region to set a precedent for future studies. The observational data set has been contributed to an archive consisting of over 100 similar cruise data sets that in aggregate provide a circumpolar view of Antarctic sea ice properties.

Related URL
Link: View Related Information

Parent DIF
This description is a member of a collection. The collection is described in
Project ID: SIMBA Drift Station


Geographic Coverage
 N: -61.85 S: -70.683  E: -64.05  W: -94.85

Data Set Citation
Version: Not provided


Temporal Coverage
Start Date: 2007-09-06
Stop Date: 2007-10-27


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN > BELLINGSHAUSEN SEA


Science Keywords
CRYOSPHERE >SEA ICE >ICE FLOES    [Definition]
CRYOSPHERE >SEA ICE >ICE TYPES    [Definition]
CRYOSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS    [Definition]
CRYOSPHERE >SNOW/ICE >ICE GROWTH/MELT    [Definition]


Platform
SV >Snow Vehicle    [Information]
GPS >Global Positioning System Satellites    [Information]
R/V NBP >R/V Nathaniel B. Palmer    [Information]


Instrument
ICE AUGERS    [Information]
STD >Salinity, Temperature, Depth    [Information]
GPS >Global Positioning System    [Information]
ACOUSTIC RADAR    [Information]


Project
NSF/PLR >Division of Polar Programs, National Science Foundation    [Information]
IPY >INTERNATIONAL POLAR YEAR    [Information]
ANTARCTIC SEA ICE >Antarctic Sea Ice in International Polar Year    [Information]
SIMBA >Sea Ice Mass Balance in the Antarctic    [Information]
SIMBA DRIFT STATION >Sea Ice Mass Balance in the Antarctic-SIMBA Drift Station    [Information]


Access Constraints
None


Data Set Progress
COMPLETE


Data Center
National Snow and Ice Data Center    [Information]
Data Center URL: http://nsidc.org

Data Center Personnel
Name: STEPHEN ACKLEY
Phone: +1 1 210 341 6556
Email: sackley at pol.net, Stephen.ackley at utsa.edu
Contact Address:
118 W Castle Ln
City: San Antonio
Province or State: Texas
Postal Code: 78213
Country: USA



Data Center Personnel
Name: NSIDC USER SERVICES
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA


Personnel
STEPHEN ACKLEY
Role: INVESTIGATOR
Phone: +1 1 210 341 6556
Email: sackley at pol.net, Stephen.ackley at utsa.edu
Contact Address:
118 W Castle Ln
City: San Antonio
Province or State: Texas
Postal Code: 78213
Country: USA


Publications/References
Ozsoy-Cicek, B., Kern, S., Ackley, S.F., Xie, H., Tekeli, A.E. (), Intercomparisons of Antarctic sea ice properties from ship observations, active and passive microwave satellite observations in the Bellingshausen Sea, Deep Sea Research II, 58, 9-10, 1092-1111, doi:10.1016/j.dsr2.2010.10.031, http://www.sciencedirect.com/science/article/pii/S0967064510003164
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2012-02-07
Last DIF Revision Date: 2018-08-29



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