Surface Heat Budget of the Arctic Ocean (SHEBA) 1997-1998
The Des Groseilliers and SHEBA ice camp, Nov. 97
SHEBA Continuous Ocean Flux Measurement
The Surface Heat Budget of the Arctic Ocean
SHEBA) program is a
coordinated program to address the interaction of the atmosphere, clouds,
ice cover and upper ocean in determining the energy balance in the Arctic.
A year-long ice camp has been established in the Arctic Ocean in October 1997
to allow a range of observation systems to be deployed to address these
Our participation in the SHEBA program uses a thermal microstructure package
attached to an automated CTD profiler to determine vertical heat fluxes in
the ocean mixed layer and upper pycnocline.
A new dual micro thermistor instrument package and automated
computer data acquisition system was successfully deployed on 12 October and
continues to produce high quality thermal structure dissipation rates and
very high resolution thermal gradients from which vertical heat fluxes are
being determined. This project is being executed in collaboration with Miles
McPhee, Jamie Morison and Doug Martinson.
SHEBA Ocean Flux Intensive Observation Period
During March 1998 a study of km-scale variations in ocean
mixed heat fluxes was made in collaboration with Miles McPhee. While
ocean mixed layer fluxes generally represent horizontal means over
100-1000m scales, this study focused on local anomalies in mixed layer
fluxes caused by ice keels left by ice deformation events. A new
self-contained momentum , heat and salt flux measurement instrument
was deployed at a site 2km from the main ice camp near a small ice
rubble ridge for a 7 day period which spanned a strong wind storm with
winds exceeding 40 knots. Simultaneous measurements of the sub-ice
topography were made with a rotating side scan sonar and a unique
precision scanned altimeter deployed under the ice. The local ocean
fluxes were compared with those measured at the main ice camp. While
two hour mean fluxes typically agreed to within 10% at the two locations,
up to a 3 fold increase was seen during measurements 100m down-stream
from the large, new ice ridge seen in the photograph below.
Snowmobile garage ice levitation, Ocean Flux IOP, March 98
Last Reviewed: February 2003
Privacy and Security Notice
Disclaimer for External Links
Material contained herein is made available for the purpose of
peer review and discussion and does not necessarily reflect the the
views of the Department of the Navy or the Department of Defense.