DBCP Workshop, Buenos Aires, October 2005 A novel ice platform for IPY.

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!