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A new tracking algorithm for sea ice age distribution estimation ArchiMer
Korosov, Anton; Rampal, Pierre; Pedersen, Leif Toudal; Saldo, Roberto; Ye, Yufang; Heygster, Georg; Lavergne, Thomas; Aaboe, Signe; Girard Ardhuin, Fanny.
A new algorithm for estimating sea ice age (SIA) distribution based on the Eulerian advection scheme is presented. The advection scheme accounts for the observed divergence or convergence and freezing or melting of sea ice and predicts consequent generation or loss of new ice. The algorithm uses daily gridded sea ice drift and sea ice concentration products from the Ocean and Sea Ice Satellite Application Facility. The major advantage of the new algorithm is the ability to generate individual ice age fractions in each pixel of the output product or, in other words, to provide a frequency distribution of the ice age allowing to apply mean, median, weighted average or other statistical measures. Comparison with the National Snow and Ice Data Center SIA...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00448/55980/57458.pdf
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Floe Size Effect on Wave-Ice Interactions: Possible Effects, Implementation in Wave Model, and Evaluation ArchiMer
Boutin, Guillaume; Ardhuin, Fabrice; Dumont, Dany; Sevigny, Caroline; Girard Ardhuin, Fanny; Accensi, Mickael.
Wind waves may play an important role in the evolution of sea ice. That role is largely determined by how fast the ice layer dissipates the wave energy. The transition from a continuous layer of ice to a series of broken floes is expected to have a strong impact on the several attenuation processes. Here we explore the possible effects of basal friction, scattering, and dissipation within the ice layer. The ice is treated as a single layer that can be fractured in many floes. Dissipation associated with ice flexure is evaluated using an anelastic linear dissipation and a cubic inelastic viscous dissipation. Tests aiming to reproduce a Marginal Ice Zone are used to discuss the effects of each process separately. Attenuation is exponential for friction and...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00454/56591/58274.pdf
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Towards a coupled model to investigate wave-sea ice interactions in the Arctic marginal ice zone ArchiMer
Boutin, Guillaume; Lique, Camille; Ardhuin, Fabrice; Rousset, Clément; Talandier, Claude; Accensi, Mickael; Girard Ardhuin, Fanny.
The Arctic Marginal Ice Zone (MIZ), where strong interactions between sea ice, ocean and atmosphere are taking place, is expanding as the result of the on-going sea ice retreat. Yet, state-of-art models are not capturing the complexity of the varied processes occurring in the MIZ, and in particular the processes involved in the ocean-sea ice interactions. In the present study, a coupled sea ice - wave model is developed, in order to improve our understanding and model representation of those interactions. The coupling allows us to account for the wave radiative stress resulting from the wave attenuation by sea ice, and the sea ice lateral melt resulting from the wave-induced sea ice break-up. We found that, locally in the MIZ, the waves can affect the sea...
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Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71283/69690.pdf
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Salinity from space unlocks satellite-based assessment of ocean acidification ArchiMer
Land, Peter; Shutler, Jamie; Findlay, Helen; Girard Ardhuin, Fanny; Sabia, Roberto; Reul, Nicolas; Piolle, Jean-francois; Chapron, Bertrand; Quilfen, Yves; Salisbury, Joseph; Vandemark, Douglas; Bellerby, Richard; Bhadury, Punyasloke.
Approximately a quarter of the carbon dioxide (CO2) that we emit into the atmosphere is absorbed by the ocean. This oceanic uptake of CO2 leads to a change in marine carbonate chemistry resulting in a decrease of seawater pH and carbonate ion concentration, a process commonly called ‘Ocean Acidification’. Salinity data are key for assessing the marine carbonate system, and new space-based salinity measurements will enable the development of novel space-based ocean acidification assessment. Recent studies have highlighted the need to develop new in situ technology for monitoring ocean acidification, but the potential capabilities of space-based measurements remain largely untapped. Routine measurements from space can provide quasi-synoptic, reproducible...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00247/35863/34384.pdf
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