GCMD




	Agriculture

	Atmosphere

	Biological Classification

	Biosphere

	Cryosphere

	Human Dimensions

	Land Surface

	Oceans

	Paleoclimate

	Solid Earth

	Spectral/Engineering

	Sun-Earth Interactions

	Terrestrial Hydrosphere



	Data Centers

	Locations

	Instruments/Sensors

	Platforms/Sources

	Projects

Are you using a browser that doesn't support JavaScript or have you disabled JavaScript?

If you have disabled JavaScript, you must re-enable JavaScript to use this page.
Or you can view this record using the Text Only Format.

Record Search Query:

Measurement of ocean waves and ice coupled waves near a fast ice boundary, McMurdo Sound

Entry ID: K137_1990_1993_NZ_1

[ Update this Record ]

Summary

Abstract: Ocean waves interact with Antarctic ice. Pack ice acts as a barrier to wave penetration, and attenuates the propagating waves. The presence of fast ice changes the nature of the wave interaction so that the wave characteristics are now determined by the properties of the ice. The interaction of ocean wave with the fast ice boundary and its contribution to ice breakup was determined experimentally ... over three seasons of study. The transfer of ocean wave energy into sea ice was measured using a portable microwave radar on Tent Island, McMurdo Sound. The radar derives ocean wave height spectra by measuring the ocean surface velocity as it varies under the action of the waves. The aim of the study was to position the radar close to a fast ice boundary, recording data during periods of ocean wave activity in order to determine the incident wave fields and the nature of the wave reflections. The interactions of ocean waves with both fixed and pack ice and the nature of the radar backscatter from these media was also investigated. In the first season, the radar was operated each day from the 20th to the 27th of January, 1991. During this time, the sea surface around Tent Island changed from a combination of fast and pack ice to continuous open sea to the north and west. In the second season, the radar was operated each day from the 14th to the 27th of January, 1992. The sea ice near Tent Island broke away rapidly in strong southerly conditions but several useful data sets were obtained. All opportunities were exploited to record worthwhile data in the conditions. Four situations were recorded; 1) Radar reflections during calm conditions were recorded from distant pack ice adjacent to the boundary of the fast ice and a water ice mixture close to Tent Island. 2) Strong southerly conditions caused the sea ice to break up and drift away. Radar data was recorded from the substantial drifting ice floes as they passed the radar site. 3) With nothing but clear sea in the radar field of view, a 24 hour data set was obtained of the sea surface drifts near Tent Island to determine the nature of the drifts. 4) A series of measurements were completed to obtain data on the basic nature of radar backscatter from a roughened sea surface when the fetch is small. These data include a range of grazing angles and different polarizations of the radar antenna and will be compared with contemporary theories of microwave backscatter from the sea surface. In the third season, the aims were to determine the spectral distribution of the available ocean wave energy at the fast ice boundary and the proportions of it that are either reflected or transmitted into the ice, and to compare the radar wave data with strain gauges placed in the fast ice to determine the characteristics of the ice coupled waves and their response to the ocean wave forcing. The radar was operated at Backdoor Bay, Cape Royds and at the sea ice edge near Cape Royds from the 22nd of November until the 8th of December in 1992. The radar wave data was compared with strain gauges placed in the fast ice to determine the characteristics of the ice coupled waves and their response to the ocean wave forcing. The measurements conducted include; a) radar measurements of the sea surface adjacent to the ice edge, b) strain gauge measurements in the ice, c) the configuration of the ice edge and in situ ice core sampling and d) underwater acoustic measurements. The microwave radar was mounted on a 15 m tower and installed close to the ice edge. The strain gauges were installed in the ice, in arrays up to 1 km back from the ice edge. Simultaneous measurements were made under two conditions, with an onshore and offshore wind.

Geographic Coverage

(Click for Interactive Map)

Spatial coordinates

N: -77.68

S: -77.68

E: 166.38

W: 166.38

(View on interactive map)

N: -77.56

S: -77.56

E: 166.22

W: 166.22

(View on interactive map)

N: -77.5

S: -77.5

E: 165.5

W: 165.5

(View on interactive map)

Temporal Coverage

Start Date: 1991-01-20

Stop Date: 1991-01-27

Location Keywords

CONTINENT > ANTARCTICA

CONTINENT > ANTARCTICA > MCMCURDO SOUND

GEOGRAPHIC REGION > POLAR

Science Keywords

OCEANS > OCEAN WAVES > WAVE FETCH

OCEANS > OCEAN WAVES > WAVE FREQUENCY

ISO Topic Category

OCEANS

Platform

FIELD SURVEYS

GROUND STATIONS

FIELD INVESTIGATION

Quality The raw data is held by NIWA on 90's optical disks. Please contact:

Murray Smith
NIWA
Private Bag 14901
Wellington
New Zealand
m.smith@niwa.co.nz

Data Set Progress

COMPLETE

Data Center

Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand

Data Center URL: http://www.antarcticanz.govt.nz/

Data Center Personnel
Name: SHULAMIT GORDON Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: s.gordon at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

Distribution

Distribution Media: HTTP

Distribution Format: OBIS Schema

Fees: None

Personnel

MARY KENNEDY

Role: DIF AUTHOR

Email: mary.kennedy at dfo-mpo.gc.ca

Contact Address:

Bedford Institute of Oceanography, P.O. Box 1006

City: Dartmouth

Province or State: Nova Scotia

Postal Code: B2Y 4A2

Country: Canada

DENIS BERNIER

Role: TECHNICAL CONTACT

Phone: 418-775-0678

Fax: 418-775-0679

Email: denis.bernier at dfo-mpo.gc.ca

Contact Address:

Institut Maurice-Lamontagne

City: Mont-Joli

Province or State: Quebec

Postal Code: G5H 3Z4

Country: Canada

Publications/References

BOURDAGES, H., D. ARCHAMBAULT, B. MORIN, A. FRÉCHET, L. SAVARD, F. GRÉGOIRE, R. DUFOUR, 2004. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d'août 2004 dans le nord du golfe du Saint-Laurent. MPO, Secrétariat canadien de consultation scientifique, Document de recherche ; DFO, Canadian Science Advisory Secretariat, Research Document, 2004/112, 40 p.

Extended Metadata Properties

(Click to view more)

Creation and Review Dates

DIF Creation Date: 2011-07-12

Last DIF Revision Date: 2013-01-09

Reformat as FGDC document

View Text Only Format

[ Update this Record ]

NASA Privacy Policy and Important Notices

Responsible NASA Official: Lola Olsen
Webmaster: Monica Holland · Contact GCMD User Support for assistance