Search Results - "Geilfus, N."

Distribution and impacts of microplastic incorporation within sea ice by Geilfus, N.-X., Munson, K.M., Sousa, J., Germanov, Y., Bhugaloo, S., Babb, D., Wang, F.

“…Microplastics (plastic particles <5 mm) are an emerging concern in Arctic sea ice with measured concentrations orders of magnitude higher than in surface…”
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Gypsum crystals observed in experimental and natural sea ice by Geilfus, N.-X., Galley, R. J., Cooper, M., Halden, N., Hare, A., Wang, F., Søgaard, D. H., Rysgaard, S.

“…Although gypsum has been predicted to precipitate in sea ice, it has never been observed. Here we provide the first report on gypsum precipitation in both…”
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pH evolution in sea ice grown at an outdoor experimental facility by Hare, A.A., Wang, F., Barber, D., Geilfus, N.-X., Galley, R.J., Rysgaard, S.

“…The pH of sea ice and brine was experimentally determined during initial ice growth and melt at the Sea-ice Environmental Research Facility (SERF), an outdoor…”
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Inorganic carbon dynamics of melt-pond-covered first-year sea ice in the Canadian Arctic by Geilfus, N.-X, Galley, R. J, Crabeck, O, Papakyriakou, T, Landy, J, Tison, J.-L, Rysgaard, S

“…Melt pond formation is a common feature of spring and summer Arctic sea ice, but the role and impact of sea ice melt and pond formation on both the direction…”
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Replacement of multiyear sea ice and changes in the open water season duration in the Beaufort Sea since 2004 by Galley, R. J., Babb, D., Ogi, M., Else, B. G. T., Geilfus, N.‐X., Crabeck, O., Barber, D. G., Rysgaard, S.

“…The last decade has witnessed the nine lowest Arctic September sea ice extents in the observational record. It also forms the most recent third of the…”
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CO2 and CH4 in sea ice from a subarctic fjord under influence of riverine input by Crabeck, O, Delille, B, Thomas, D, Geilfus, N-X, Rysgaard, S, Tison, J-L

“…We present the CH4 concentration [CH4], the partial pressure of CO2 (pCO2) and the total gas content in bulk sea ice from subarctic, land-fast sea ice in the…”
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Imaged brine inclusions in young sea ice—Shape, distribution and formation timing by Galley, R.J., Else, B.G.T., Geilfus, N.-X., Hare, A.A., Isleifson, D., Barber, D.G., Rysgaard, S.

“…Liquid inclusions in sea ice are variable and dependent on the myriad of physical conditions of the atmosphere–sea ice environment in which the sea ice was…”
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Spatial and temporal variability of seawater pCO2 within the Canadian Arctic Archipelago and Baffin Bay during the summer and autumn 2011 by Geilfus, N.-X., Pind, M.L., Else, B.G.T., Galley, R.J., Miller, L.A., Thomas, H., Gosselin, M., Rysgaard, S., Wang, F., Papakyriakou, T.N.

“…The partial pressure of CO2 in surface water (pCO2sw) measured within the Canadian Arctic Archipelago (CAA) and Baffin Bay was highly variable with values…”
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Physical controls on the storage of methane in landfast sea ice by Zhou, J, Tison, J.-L, Carnat, G, Geilfus, N.-X, Delille, B

“…We report on methane (CH4) dynamics in landfast sea ice, brine and under-ice seawater at Barrow in 2009. The CH4 concentrations in under-ice water ranged from…”
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First estimates of the contribution of CaCO3 precipitation to the release of CO2 to the atmosphere during young sea ice growth by Geilfus, N.-X., Carnat, G., Dieckmann, G. S., Halden, N., Nehrke, G., Papakyriakou, T., Tison, J.-L., Delille, B.

“…We report measurements of pH, total alkalinity, air‐ice CO2 fluxes (chamber method), and CaCO3 content of frost flowers (FF) and thin landfast sea ice. As the…”
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Landfast sea ice in the Bothnian Bay (Baltic Sea) as a temporary storage compartment for greenhouse gases by Geilfus, N.-X., Munson, K. M., Eronen-Rasimus, E., Kaartokallio, H., Lemes, M., Wang, F., Rysgaard, S., Delille, B.

“…Although studies of biogeochemical processes in polar sea ice have been increasing, similar research on relatively warm low-salinity sea ice remains sparse. In…”
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First "in situ" determination of gas transport coefficients (DO2, DAr, and DN2) from bulk gas concentration measurements (O2, N2, Ar) in natural sea ice by Crabeck, Odile, Delille, B., Rysgaard, S., Thomas, D. N., Geilfus, N.-X., Else, B., Tison, J.-L.

“…Abstract We report bulk gas concentrations of O 2 , N 2 , and Ar, as well as their transport coefficients, in natural landfast subarctic sea ice in southwest…”
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Temporal dynamics of ikaite in experimental sea ice by Rysgaard, S, Wang, F, Galley, R. J, Grimm, R, Notz, D, Lemes, M, Geilfus, N.-X, Chaulk, A, Hare, A. A, Crabeck, O, Else, B. G. T, Campbell, K, Sørensen, L. L, Sievers, J, Papakyriakou, T

“…Ikaite (CaCO3 · 6H2O) is a metastable phase of calcium carbonate that normally forms in a cold environment and/or under high pressure. Recently, ikaite…”
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Consequences of change and variability in sea ice on marine ecosystem and biogeochemical processes during the 2007–2008 Canadian International Polar Year program by Barber, David G., Asplin, Matthew G., Papakyriakou, Tim N., Miller, Lisa, Else, Brent G. T., Iacozza, John, Mundy, C. J., Gosslin, M., Asselin, Natalie C., Ferguson, Steve, Lukovich, Jennifer V., Stern, Gary A., Gaden, Ashley, Pućko, Monika, Geilfus, N.-X., Wang, Fei

“…Change and variability in the timing and magnitude of sea ice geophysical and thermodynamic state have consequences on many aspects of the arctic marine…”
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A Model‐Based Analysis of Physical and Biogeochemical Controls on Carbon Exchange in the Upper Water Column, Sea Ice, and Atmosphere in a Seasonally Ice‐Covered Arctic Strait by Mortenson, Eric, Steiner, N., Monahan, A. H., Miller, L. A., Geilfus, N.‐X., Brown, K.

“…In this study, we consider a 1‐D model incorporating both sea ice and pelagic systems in order to assess the importance of various processes on the vertical…”
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Under-ice eddy covariance flux measurements of heat, salt, momentum, and dissolved oxygen in an artificial sea ice pool by Else, B.G.T., Rysgaard, S., Attard, K., Campbell, K., Crabeck, O., Galley, R.J., Geilfus, N.-X., Lemes, M., Lueck, R., Papakyriakou, T., Wang, F.

“…Turbulent exchanges under sea ice play a controlling role in ice mass balance, ice drift, biogeochemistry, and mixed layer modification. In this study, we…”
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Ikaite crystal distribution in winter sea ice and implications for CO2 system dynamics by Rysgaard, S, Søgaard, D H, Cooper, M, Pu&cacute, M, Lennert, ko;K, Papakyriakou, T N, Wang, F, Geilfus, N X, Glud, R N, Ehn, J, McGinnis, D F, Attard, K, Sievers, J, Deming, J W, Barber, D

“…The precipitation of ikaite (CaCO3 [sm middot] 6H2 O) in polar sea ice is critical to the efficiency of the sea ice-driven carbon pump and potentially…”
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Dynamics of pCO2 and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea) by Geilfus, N.-X, Carnat, G, Papakyriakou, T, Tison, J.-L, Else, B, Thomas, H, Shadwick, E, Delille, B

“…We present an Arctic seasonal survey of carbon dioxide partial pressure (pCO2) dynamics within sea ice brine and related air-ice CO2 fluxes. The survey was…”
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Sea ice pCO2 dynamics and air–ice CO2 fluxes during the Sea Ice Mass Balance in the Antarctic (SIMBA) experiment – Bellingshausen Sea, Antarctica by Geilfus, N.-X., Tison, Jean-Louis, Ackley, S. F., Galley, R. J., Rysgaard, S., Miller, L. A., Delille, Bruno

“…Temporal evolution of pCO2 profiles in sea ice in the Bellingshausen Sea, Antarctica, in October 2007 shows physical and thermodynamic processes controls…”
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Dynamics of pCO2and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea) by Geilfus, N.-X., Carnat, G., Papakyriakou, T., Tison, J.-L., Else, B., Thomas, H., Shadwick, E., Delille, B.

“…We present an Arctic seasonal survey of carbon dioxide partial pressure (pCO2) dynamics within sea ice brine and related air‐ice CO2 fluxes. The survey was…”
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