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Article Reference Data assimilation with the ensemble Kalman filter in a numerical model of the North Sea
Coastal management and maritime safety strongly rely on accurate representations of the sea state. Both dynamical models and observations provide abundant pieces of information. However, none of them provides the complete picture. The assimilation of observations into models is one way to improve our knowledge of the ocean state. Its application in coastal models remains challenging because of the wide range of temporal and spatial variabilities of the processes involved. This study investigates the assimilation of temperature profiles with the ensemble Kalman filter in 3-D North Sea simulations. The model error is represented by the standard deviation of an ensemble of model states. Parameters’ values for the ensemble generation are first computed from the misfit between the data and the model results without assimilation. Then, two square root algorithms are applied to assimilate the data. The impact of data assimilation on the simulated temperature is assessed. Results show that the ensemble Kalman filter is adequate for improving temperature forecasts in coastal areas, under adequate model error specification.
Located in Library / RBINS Staff Publications 2016
Article Reference The Hautes Fagnes meteorite find: A new LL5 (S1) chondrite from Belgium
Abstract Around 1965 a meteorite was found in the Hautes Fagnes region in eastern Belgium. It was made available for scientific investigation in 2007. The meteorite specimen has a mass of 185 g and a density of 3.56 g/cm(3). It is light grey with darker angular fragments, and a thin fusion crust. It contains specks of metal of submillimetre size that show little weathering. Submillimetre sized chondrules with blurred outlines make up ca. 40 % of the specimen, and consist mainly of olivine and orthopyroxene. Troilite, kamacite and taenite were found in the chondrules and in the matrix. Native copper was identified at the contact of troilite and iron-nickel grains. Minor minerals in the matrix include albitic plagioclase, clinopyroxene, chromite, and chlorapatite. The average molar fayalite content of olivine was estimated at 29.37 %, and the ferrosilite content of orthopyroxene was estimated at 23.75 %. Bulk chemical analysis with ICP-OES was carried out (I) after fusion with LiBO2 and (2) after microwave digestion in strong acids. The meteorite is distinctly magnetic, with a mass specific magnetic susceptibility logX of 3.83: This meteorite can be classified as a LL ordinary chondrite of petrologic type 5, and of shock classification stage S1 (unshocked).
Located in Library / RBINS Staff Publications
Article Reference Ancient asexuals
Located in Library / RBINS Staff Publications
Article Reference Causes and magnitude of body weight changes in trap-confined bank voles, Clethrionomys glareolus
Located in Library / RBINS Staff Publications
Article Reference Circumantarctic and eurybathid distribution in Southern Ocean benthos? A genetic test using Macrocyprididae (Crustacea, Ostracoda) as model organism
Located in Library / RBINS Staff Publications
Article Reference A challenge for changes
Located in Library / RBINS Staff Publications
Article Reference Did Pleistocene glaciations shape genetic patterns of European ostracods? A phylogeograpic analysis of two species with asexual reproduction
Located in Library / RBINS Staff Publications
Article Reference Two families of non-LTR retrotransposons, Syrinx and Daphne, from the Darwinulid ostracod, Darwinula stevensoni
Located in Library / RBINS Staff Publications
Article Reference No evidence for the 'Meselson effect' in parthenogenetic oribatid mites (Oribatida, Acari)
Located in Library / RBINS Staff Publications
Article Reference Sex in space! The importance of reproductive modes in astrobiology
Located in Library / RBINS Staff Publications