The Coordinated Eastern Arctic Experiment: SPRI sea-ice studies

Polar Record ◽  
1990 ◽  
Vol 26 (158) ◽  
pp. 203-210 ◽  
Author(s):  
R. G. Williams ◽  
N. R. Davis ◽  
S. C. Moore
Keyword(s):  
Time Series ◽  
Sea Ice ◽  
Strong Coupling ◽  
Time Scales ◽  
Internal Waves ◽  
Naval Research ◽  
Coupling Mechanism ◽  
Office Of Naval Research ◽  
Polar Research Institute ◽  
Horizontal Strain

AbstractDuring March and April 1989 a two-man team from the Scott Polar Research Institute (SPRI) and Science Applications International Corporation (SAIC) took part in the oceanography ice camp phase of the Office of Naval Research-sponsored Coordinated Eastern Arctic Experiment (CEAREX). The aim of the experiment was to measure with strainmeters and tiltmeters the interaction between oceanic internal waves and sea ice. Arrays of these instruments were deployed to measure horizontal strain and vertical tilt fields continuously over a 29-day period. The resulting time series show quite clearly internal wavelike activity indicating that a strong coupling mechanism exists. Other interesting phenomena are evident in the data with timę-scales varying from seconds to several days.

scholarly journals Robust wavebuoys for the marginal ice zone: Experiences from a large persistent array in the Beaufort Sea

Elem Sci Anth ◽  
2017 ◽  
Vol 5 ◽  
Author(s):  
Martin J. Doble ◽  
Jeremy P. Wilkinson ◽  
Lovro Valcic ◽  
Jeremy Robst ◽  
Andrew Tait ◽  
...  
Keyword(s):  
Sea Ice ◽  
Significant Proportion ◽  
Open Water ◽  
Beaufort Sea ◽  
Ice Cover ◽  
Naval Research ◽  
Ice Dynamics ◽  
Office Of Naval Research ◽  
Marginal Ice Zone ◽  
Sample Frequency

An array of novel directional wavebuoys was designed and deployed into the Beaufort Sea ice cover in March 2014, as part of the Office of Naval Research Marginal Ice Zone experiment. The buoys were designed to drift with the ice throughout the year and monitor the expected breakup and retreat of the ice cover, forced by waves travelling into the ice from open water. Buoys were deployed from fast-and-light air-supported ice camps, based out of Sachs Harbour on Canada’s Banks Island, and drifted westwards with the sea ice over the course of spring, summer and autumn, as the ice melted, broke up and finally re-froze. The buoys transmitted heave, roll and pitch timeseries at 1 Hz sample frequency over the course of up to eight months, surviving both convergent ice dynamics and significant waves-in-ice events. Twelve of the 19 buoys survived until their batteries were finally exhausted during freeze-up in late October/November. Ice impact was found to have contaminated a significant proportion of the Kalman-filter-derived heave records, and these bad records were removed with reference to raw x/y/z accelerations. The quality of magnetometer-derived buoy headings at the very high magnetic field inclinations close to the magnetic pole was found to be generally acceptable, except in the case of four buoys which had probably suffered rough handling during transport to the ice. In general, these new buoys performed as expected, though vigilance as to the veracity of the output is required.

The FRAM expeditions: Arctic Ocean studies from floating ice, 1979–82

Polar Record ◽  
1983 ◽  
Vol 21 (135) ◽  
pp. 583-589 ◽  
Author(s):  
Leonard Johnson
Keyword(s):  
Scientific Discipline ◽  
Environmental Data ◽  
The Arctic ◽  
Naval Research ◽  
Unsuccessful Attempt ◽  
The Third ◽  
Office Of Naval Research ◽  
Pack Ice ◽  
Polar Research Institute ◽  
The Laptev Sea

In May 1982, with the successful conclusion of FRAM IV, the Office of Naval Research (ONR) completed the FRAM series of observations from ice floe stations in the eastern Arctic (Fig 1)—expeditions initiated each spring from 1979 to 1982. The programme developed from an unsuccessful attempt by the Arctic Programme of the ONR to duplicate Fridtjof Nansen's drift of the FRAM across the Arctic. This was to have involved freezing the icebreaker USCGC Burton Island in the pack ice of the Laptev Sea, but the programme was cancelled due to lack of support. Arctic scientists meeting at the Third Symposium on Antarctic Geology and Geophysics at Madison, Wisconsin, decided on an alternative programme involving ice floe stations. Named FRAM in honour of Nansen's vessel (Hunkins and others 1979a; Kristoffersen 1979), this was eventually organized by the Arctic Programme of ONR to provide basic environmental data from the eastern Arctic north of Greenland. From its inception FRAM emphasized multi-disciplinary research by scientists of several nations. The stations were under US management, with logistics coordinated by the Polar Research Center, University of Washington, under ONR contract. Danish scientists were involved through the Commission for Scientific Research in Greenland, Norwegians through the Norsk Polarinstitutt, British scientists through the Scott Polar Research Institute, and Canadians through the Bedford Institute of Oceanography. Each expedition emphasized a particular scientific discipline with supporting programmes: below are listed the dates, major studies (priority discipline first), chief scientists and key data reports of each.

Field experiments on wave-ice interaction in the Labrador and east Greenland currents, 1978

Polar Record ◽  
1979 ◽  
Vol 19 (121) ◽  
pp. 373-376 ◽  
Author(s):  
Peter Wadhams
Keyword(s):  
Field Experiments ◽  
Wave Attenuation ◽  
Ocean Waves ◽  
Naval Research ◽  
Washington Dc ◽  
Ice Dynamics ◽  
East Greenland ◽  
Office Of Naval Research ◽  
Pack Ice ◽  
Polar Research Institute

Two field experiments took place in 1978 as part of a project to study ocean wave attenuation in the marginal pack ice zone and the effect of ocean waves on floe break-up and ice dynamics. The main partners in the project are the Scott Polar Research Institute and the Electromagnetics Institute, Technical University of Denmark (TUD), Lyngby, with funding from the Office of Naval Research (ONR), Washington DC, and the Danish government. The first experiment was a pilot study carried out in co-operation with C-CORE (Centre for Cold Oceans Resources Engineering) at Memorial University of Newfoundland, St John's, and took place in the Labrador Sea. The second experiment was a major field study carried out in September 1978 from Mesters Vig, east Greenland. The project will be completed by a second main experiment at Mesters Vig in summer 1979, with supporting experiments in the Bering Sea and west Greenland in spring 1979.

Sub-seasonal prediction of Arctic sea ice concentration using time series forecasting technique

2020 ◽  
Author(s):  
Baek-Min Kim ◽  
Ha-Rim Kim ◽  
Yong-Sang Choi ◽  
Yejin Lee ◽  
Gun-Hwan Yang
Keyword(s):  
Time Series ◽  
Sea Ice ◽  
Time Scales ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Sea Ice Concentration ◽  
Arctic Sea ◽  
Ice Concentration ◽  
Ncep Cfs

<div> <div> <div> <p>Recently, many studies have highlighted the importance of the ability to predict the Arctic sea ice concentration in the sub-seasonal time scales. Notably, the Arctic sea ice concentration has a potential for skillful predictions through their long-term trend memory. Based on the long-term memory of Arctic sea ice concentration, we evaluate the predictability of Arctic sea ice concentration (SIC) by applying a time-series analysis technique of the Prophet model on sub-seasonal time scales. A Prophet is a recently introduced method as a statistical approach inspired by the nature of time series forecasted at Facebook and has not been applied to the prediction of Arctic SIC before. Sub-seasonal prediction skills of Arctic SIC in the Prophet model were compared with the NCEP Climate Forecast System Reforecast (CFS-Reforecast) model as a dynamical approach and verified with the satellite observation during wintertime from 2000 to 2018 for 1 to 8 weeks lead times. The result shows that the Prophet model exhibits much better skill than the NCEP CFS-Reforecast model in the climatology prediction except for the 1 to 3 weeks lead times, as the Prophet model has mainly the ability to capture the long-term trend. In the anomaly prediction, however, the NCEP CFS-Reforecast model is superior to the Prophet model in the prediction of sub-seasonal time scales, as the NCEP CFS-Reforecast captures more effectively the sub-seasonal transition of the underlying dynamical system. Therefore, even if the Prophet model has shown a useful skill in predicting the climatological Arctic SIC, there is still a need to improve the accuracy and robustness of the predictions in an anomalous Arctic SIC. Further, we suggest that the bias correction method is needed to improve the forecast skill of Arctic SIC using the time-series analysis technique, and it will be critical to advance the field of the Arctic SIC forecasting on the sub-seasonal time scales.</p> </div> </div> </div>

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