Edge wave observation using remote seismoacoustic sensing of ice events in the Arctic

Dudko, Yuriy V.; Schmidt, Henrik; Heydt, Keith von der; Scheer, Edward

doi:10.1029/98jc01268

Cited by 10 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So far, we have analysed the heterogeneity of sea ice fracture and deformation in the spatial domain. However, these processes are also strongly irregular in the time domain: as with the Earth's crust, the deformation is accommodated during short-duration events (fracturing episodes) that relate to the brittle character of sea ice (e.g., Dudko et al [55]). Sea ice stresses monitored over several months by stress gauges frozen into the ice cover during the Sea Ice Mechanics Initiative (SIMI) field program (Lewis and Richter-Menge [14]; Richter-Menge and Elder [56]), also exhibited a strong intermittency.…”

Section: Dynamical Observations: Intermittency Of the Deformation Pro...mentioning

confidence: 99%

Scale properties of sea ice deformation and fracturing

Weiss

Marsan

2004

Comptes Rendus. Physique

View full text Add to dashboard Cite

The sea ice cover, which insulates the ocean from the atmosphere, plays a fundamental role in the Earth's climate system. This cover deforms and fractures under the action of winds, ocean currents and thermal stresses. Along with thermodynamics, this deformation and fracturing largely controls the amount of open water within the ice cover and the distribution of ice thickness, two parameters of high climatic importance, especially during fall and winter (no melting). Here we present a scaling analysis of sea ice deformation and fracturing that allows us to characterize the heterogeneity of fracture patterns and of deformation fields, as well as the intermittency of stress records. We discuss the consequences of these scaling properties, particularly for sea ice modelling in global climate models. We show how multifractal scaling laws can be extrapolated to small scales to learn about the nature of the mechanisms that accommodate the deformation. We stress that these scaling properties preclude the use of homogenisation techniques (i.e. the use of mean values) to link different scales, and we discuss how these detailed observations should be used to constrain sea ice dynamics modelling.

show abstract

Section: Dynamical Observations: Intermittency Of the Deformation Pro...mentioning

confidence: 99%

Scale properties of sea ice deformation and fracturing

Weiss

Marsan

2004

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…at the timescale of crack propagation, was not available until recently except for short-duration (week-long) experiments that only investigated high-frequency noise (e.g. Dudko et al, 1998). During the DAMOCLES field campaign in spring 2007, a network of broadband (100 Hz-60 s) threecomponent seismometers was installed around Tara, recording signals dominated by ice swell (Marsan et al, 2011).…”

Section: Sea Ice Deformationmentioning

confidence: 99%

Advances in understanding and parameterization of small-scale physical processes in the marine Arctic climate system: a review

et al. 2014

View full text Add to dashboard Cite

Abstract. The Arctic climate system includes numerous highly interactive small-scale physical processes in the atmosphere, sea ice, and ocean. During and since the International Polar Year 2007-2009, significant advances have been made in understanding these processes. Here, these recent advances are reviewed, synthesized, and discussed. In atmospheric physics, the primary advances have been in cloud physics, radiative transfer, mesoscale cyclones, coastal, and fjordic processes as well as in boundary layer processes and surface fluxes. In sea ice and its snow cover, advances have been made in understanding of the surface albedo and its relationships with snow properties, the internal structure of sea ice, the heat and salt transfer in ice, the formation of superimposed ice and snow ice, and the small-scale dynamics of sea ice. For the ocean, significant advances have been related to exchange processes at the ice-ocean interface, diapycnal mixing, double-diffusive convection, tidal currents and diurnal resonance. Despite this recent progress, some of these small-scale physical processes are still not sufficiently understood: these include wave-turbulence interactions in the atmosphere and ocean, the exchange of heat and salt at the ice-ocean interface, and the mechanical weakening of sea ice. Many other processes are reasonably well understood as stand-alone processes but the challenge is to understand their interactions with and impacts and feedbacks on other processes. Uncertainty in the parameterization of small-scale processes continues to be among the greatest challenges facing climate modelling, particularly in high latitudes. Further improvements in parameterization require new year-round field campaigns on the Arctic sea ice, closely combined with satellite remote sensing studies and numerical model experiments.

show abstract

“…These numbers are representative of the 3-day time scale over which the deformation field is sampled. For shorter durations, intermittency of the deformation, as indicated by the occurrence of icequakes [18] or observed with stress gauges [19], implies that the localization should increase, with the possibility that most of the deformation could be accommodated by brittle failure over short, transient fracturing episodes involving very localized structures.…”

mentioning

confidence: 99%

Scale Dependence and Localization of the Deformation of Arctic Sea Ice

et al. 2004

View full text Add to dashboard Cite

A scaling analysis of the deformation of Arctic sea ice over a 3-day time period is performed for scales of 10 to 1000 km. The deformation field is derived from satellite radar data; it allows us to study how a very large solid body-the Arctic sea-ice cover-deforms under the action of heterogeneous forcing winds and ocean currents. The deformation is strongly localized at small scales, and can be characterized as multifractal. This behavior is well known for turbulent flows, and is here also observed for a deforming solid. A multiscaling extrapolation to the meter scale (laboratory scale) shows that, at the 3-day time scale, about 15% of the deformation is larger than 10(-4) s(-1), implying brittle failure, over 0.2% of the total area.

show abstract

Edge wave observation using remote seismoacoustic sensing of ice events in the Arctic

Cited by 10 publications

References 7 publications

Scale properties of sea ice deformation and fracturing

Scale properties of sea ice deformation and fracturing

Advances in understanding and parameterization of small-scale physical processes in the marine Arctic climate system: a review

Scale Dependence and Localization of the Deformation of Arctic Sea Ice

Contact Info

Product

Resources

About