DBCP Workshop, Buenos Aires, October 2005
A novel ice platform for IPY
DBCP Workshop, Buenos Aires, October 2005
Background
• Role of sea ice in climate
change
• Several polar deployments
over last few years• Use of Iridium and Argos• Opportunities during IPY
2007-8• Development of new
platform for flux and hydrographic measurements
DBCP Workshop, Buenos Aires, October 2005
Global oceanic heat flux
DBCP Workshop, Buenos Aires, October 2005
DBCP Workshop, Buenos Aires, October 2005
DBCP Workshop, Buenos Aires, October 2005
Arctic Synoptic Basin-wide Oceanography (ASBO)
• Quantify the current fresh water (both solid and liquid) and salt content of the Arctic Ocean
• Quantify the heat and freshwater exchanges between the ocean, atmosphere, sea ice and land within the Arctic basin and to surrounding ocean basins
• Provide an understanding of past changes in Arctic Ocean and North Atlantic salinity and temperature structure using numerical models, satellite data and historical datasets
DBCP Workshop, Buenos Aires, October 2005
Proposed IPY cruise tracks (2007)
DBCP Workshop, Buenos Aires, October 2005
Ice platforms• Surface meteorology
• Vaisala WXT510 multi sensor• ? SVP-B
• Net surface radiation fluxes• Kipp & Zonen CNR net radiometers
• Heat flux through sea ice• Ice mass balance• Boundary layer currents• Sub-ice CTDs• GPS• Web cam• Iridium and Argos comms
DBCP Workshop, Buenos Aires, October 2005
In-ice thermistor chains• Chain 1
• Wholly within ice• Diffusive heat flux measurements
• Chain 2• Across ice-air interface
• Position of interface for mass balance• B/L current in ‘hot-wire anemometer’ mode
• Chain 3• Across ice-water interface
• Position of interface for mass balance• B/L current in ‘hot-wire anemometer’ mode
• Possible use of Dallas ‘1-wire’ sensors• Ease of cabling• Poor accuracy, but good stability and
resolution
DBCP Workshop, Buenos Aires, October 2005
In-ice thermistor chains
DBCP Workshop, Buenos Aires, October 2005
Sub-ice CTDs
• Use ‘HOMER’ profiler in inverted mode, or commercial system
• Profile depth set using GPS and bathymetric look-up table
• Data transfer by IR link (HOMER) or inductive modem
DBCP Workshop, Buenos Aires, October 2005
HOMER profiler
DBCP Workshop, Buenos Aires, October 2005
HOMER winch assembly
DBCP Workshop, Buenos Aires, October 2005
DBCP Workshop, Buenos Aires, October 2005
Gracias!