Measurement of large scale deformation of the Arctic ice pack using acoustic backscatter

1993 ◽  
Vol 94 (3) ◽  
pp. 1761-1761
Author(s):  
Greg Duckworth ◽  
Kevin LePage ◽  
Ted Farrell
Keyword(s):  
Large Scale ◽  
The Arctic ◽  
Acoustic Backscatter ◽  
Arctic Ice ◽  
Ice Pack

scholarly journals Correlated Energy Exchange in Drifting Sea Ice

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
A. Chmel ◽  
V. Smirnov
Keyword(s):  
Sea Ice ◽  
Large Scale ◽  
The Arctic ◽  
Actual State ◽  
Energy Distributions ◽  
Nonextensive Statistical Mechanics ◽  
Long Range Interactions ◽  
Measured Speed ◽  
Arctic Ice ◽  
Ice Pack

The ice floe speed variations were monitored at the research camp North Pole 35 established on the Arctic ice pack in 2008. A three-month time series of measured speed values was used for determining changes in the kinetic energy of the drifting ice floe. The constructed energy distributions were analyzed by methods of nonextensive statistical mechanics based on the Tsallis statistics for open nonequilibrium systems, such as tectonic formations and drifting sea ice. The nonextensivity means the nonadditivity of externally induced energy changes in multicomponent systems due to dynamic interrelation of components having no structural links. The Tsallis formalism gives one an opportunity to assess the correlation between ice floe motions through a specific parameter, the so-called parameter of nonextensivity. This formalistic assessment of the actual state of drifting pack allows one to forecast some important trends in sea ice behavior, because the level of correlated dynamics determines conditions for extended mechanical perturbations in ice pack. In this work, we revealed temporal fluctuations of the parameter of nonextensivity and observed its maximum value before a large-scale sea ice fragmentation (faulting) of consolidated sea ice. The correlation was not detected in fragmented sea ice where long-range interactions are weakened.

Under-ice noise resulting from thermally induced fracturing of the arctic ice pack: Theory and a test case application

2000 ◽  
Vol 105 (C4) ◽  
pp. 8813-8826 ◽  
Author(s):  
Peter J. Stein ◽  
James K. Lewis ◽  
James C. Parinella ◽  
Steven E. Euerle
Keyword(s):  
The Arctic ◽  
Test Case ◽  
Thermally Induced ◽  
Case Application ◽  
Arctic Ice ◽  
Ice Pack

Noise background levels and noise event tracking/characterization under the Arctic Ice Pack: Experiment, data analysis, and modeling

2016 ◽  
Vol 140 (4) ◽  
pp. 3408-3408
Author(s):  
Kevin Williams ◽  
Michael L. Boyd ◽  
Alexander G. Soloway ◽  
Eric I. Thorsos ◽  
Steven G. Kargl ◽  
...  
Keyword(s):  
Data Analysis ◽  
The Arctic ◽  
Experiment Data ◽  
Noise Background ◽  
Background Levels ◽  
Event Tracking ◽  
Arctic Ice ◽  
Ice Pack

scholarly journals Variability of Arctic sea ice thickness and volume from CryoSat-2

2015 ◽  
Vol 373 (2045) ◽  
pp. 20140157 ◽  
Author(s):  
R. Kwok ◽  
G. F. Cunningham
Keyword(s):  
Large Scale ◽  
Ice Cover ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Ice Thickness ◽  
Sea Ice Thickness ◽  
Notable Increase ◽  
Arctic Ice ◽  
Arctic Sea Ice Thickness ◽  
Volume Estimates

We present our estimates of the thickness and volume of the Arctic Ocean ice cover from CryoSat-2 data acquired between October 2010 and May 2014. Average ice thickness and draft differences are within 0.16 m of measurements from other sources (moorings, submarine, electromagnetic sensors, IceBridge). The choice of parameters that affect the conversion of ice freeboard to thickness is discussed. Estimates between 2011 and 2013 suggest moderate decreases in volume followed by a notable increase of more than 2500 km 3 (or 0.34 m of thickness over the basin) in 2014, which could be attributed to not only a cooler summer in 2013 but also to large-scale ice convergence just west of the Canadian Arctic Archipelago due to wind-driven onshore drift. Variability of volume and thickness in the multiyear ice zone underscores the importance of dynamics in maintaining the thickness of the Arctic ice cover. Volume estimates are compared with those from ICESat as well as the trends in ice thickness derived from submarine ice draft between 1980 and 2004. The combined ICESat and CryoSat-2 record yields reduced trends in volume loss compared with the 5 year ICESat record, which was weighted by the record-setting ice extent after the summer of 2007.

Recent behavior of the Nares Strait ice arches: anomalous collapses and enhanced export of multi-year ice from the Arctic Ocean

2020 ◽  
Author(s):  
Kent Moore ◽  
Stephen Howell ◽  
Mike Brady ◽  
Xiaoyong Xu ◽  
Kaitlin McNeil
Keyword(s):  
Sea Ice ◽  
Arctic Ocean ◽  
The Arctic ◽  
Nares Strait ◽  
Short Period ◽  
The Arctic Ocean ◽  
Arctic Ice ◽  
Policy Communities ◽  
Ice Pack ◽  
Area And Volume

<p>The ice arches that usually develop at the northern and southern ends of Nares Strait play an important role in modulating the export of multi-year sea ice out of the Arctic Ocean.   As a result of global warming, the Arctic Ocean is evolving towards an ice pack that is younger, thinner and more mobile and the fate of its multi-year ice is becoming of increasing interest to both the scientific and policy communities.  Here, we use sea ice motion retrievals derived from Sentinel-1 imagery to report on recent behaviour of these ice arches and the associated ice flux. In addition to the previously identified early collapse of the northern ice arch in May 2017, we report that this arch failed to develop during the winters of 2018 and 2019.  In contrast, we report that the southern ice arch was only present for a short period of time during the winter of 2018.  We also show that the duration of arch formation has decreased over the past 20 years as ice in the region has thinned, while the ice area and volume fluxes have both increased.  These results suggest that a transition is underway towards a state where the formation of these arches will become atypical with a concomitant increase in the export of multi-year ice accelerating the transition towards a younger and thinner Arctic ice pack.</p>

Transport measurements in the arctic ice-pack

1980 ◽  
Vol 7 (4) ◽  
pp. 293-302 ◽  
Author(s):  
Benjamin Gebhart ◽  
Tore Audunson
Keyword(s):  
The Arctic ◽  
Transport Measurements ◽  
Arctic Ice ◽  
Ice Pack

Noise Background Levels and Noise Event Tracking/Characterization Under the Arctic Ice Pack: Experiment, Data Analysis, and Modeling

2018 ◽  
Vol 43 (1) ◽  
pp. 145-159 ◽  
Author(s):  
Kevin L. Williams ◽  
Michael L. Boyd ◽  
Alexander G. Soloway ◽  
Eric I. Thorsos ◽  
Steven G. Kargl ◽  
...  
Keyword(s):  
Data Analysis ◽  
The Arctic ◽  
Experiment Data ◽  
Noise Background ◽  
Background Levels ◽  
Event Tracking ◽  
Arctic Ice ◽  
Ice Pack
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