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17 Research products, page 1 of 2

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  • Other research product . Other ORP type . 2013
    Open Access
    Authors: 
    Perovich, D. K.; Gerland, Sebastian; Hendricks, Stefan; Meier, Walt; Nicolaus, Marcel; Richter-Menge, J. A.; Tschudi, M.;
    Publisher: NOAA Office of Oceanic & Atmospheric Research
    Country: Germany

    Highlights The September 2013 Arctic sea ice minimum extent was 5.10 million km2. This was 1.69 million km2 greater than the record minimum set in 2012, but was still the sixth smallest ice extent of the satellite record (1979-2013). The amount of first year sea ice continues to increase, accounting for 78% of the ice cover in March 2013. A satellite-derived, Arctic Ocean-wide decrease in sea ice freeboard, from 0.23 m in March 2011 to 0.19 m in March 2013, implies a 0.32 m decrease in ice thickness, from 2.26 m to 1.94 m.

  • Open Access
    Authors: 
    Haas, Christian;
    Country: Germany
  • Open Access
    Authors: 
    Su, Yushan; Hung, Hayley; Brice, Kenneth A; Su, Ky; Alexandrou, Nick; Blanchard, Pierrette; Chan, Elton; Sverko, Ed; Fellin, Phil;
    Publisher: PANGAEA
    Country: Germany

    Atmospheric PBDEs were measured on a monthly basis in 2002-2004 at Point Petre, a rural site in the Great Lakes. Average air concentrations were 7.0 ± 13 pg m**-3 for the sum of 14BDE (excluding BDE-209), and 1.8 ± 1.5 pg m**-3 for BDE-209. Concentrations of 3 dominant congeners (i.e., BDE-47, 99, and 209) were comparable to previous measurements at remote/rural sites around the Great Lakes, but much lower than those at urban areas. Weak temperature dependence and strong linear correlations between relatively volatile congeners suggest importance of advective inputs of gaseous species. The significant correlation between BDE-209 and 183 implies their transport inputs associated with particles. Particle-bound percentages were found greater for highly brominated congeners than less brominated ones. These percentages increase with decreasing ambient temperatures. The observed gas/particle partitioning is consistent with laboratory measurements and fits well to the Junge-Pankow model. Using air mass back-trajectories, atmospheric transport to Point Petre was estimated as 76% for BDE-47, 67% for BDE-99, and 70% for BDE-209 from west-northwest and southwest directions. During the same time period, similar congener profiles and concentration levels were found at Alert in the Canadian High Arctic. Different inter-annual variations between Point Petre and Alert indicate that emissions from other regions than North America could also contribute PBDEs in the Arctic. In contrast to weak temperature effect at Point Petre, significant temperature dependence in the summertime implies volatilization emissions of PBDEs at Alert. Meanwhile, episodic observations in the wintertime were likely associated with enhanced inputs through long-range transport during the Arctic Haze period.

  • Open Access
    Authors: 
    De Mol, Lies; Hilário, Ana; Larmagnat, Stéphanie; Henriet, Jean-Pierre;
    Publisher: Renard Centre of Marine Geology, Ghent University
    Country: Germany
    Project: NSERC
  • Open Access
    Authors: 
    Oakey, G. N.; Damaske, Detlef;
    Publisher: Alfred Wegener Institute for Polar and Marine Research & German Society of Polar Research
    Country: Germany
  • Open Access
    Authors: 
    Haas, Christian;
    Country: Germany

    While the summer sea ice extent has beendecreasing in the Artic by 8% per decade for the past 30 years,the ice extent has actually increased slightlyin the Antarctic. Ice thickness changes are less well known. In the central Arctic, sea ice thinned by 43%between 19581976 and 19931997. In the Transpolar Drift, level ice thickness decreased by 20% between1991 and 2001. The interpretation of those changes is difficult, however, as both air and water temperatures,as well as the direction and strength of the wind-driven ice drift, have a strong impact on ice thickness.

  • Open Access
    Authors: 
    Rachold, Volker;
    Publisher: Alfred Wegener Institute for Polar and Marine Research
    Country: Germany
  • Open Access
    Authors: 
    Milligan, A. J.;
    Publisher: PANGAEA
    Country: Germany
    Project: NSERC , NSF | Center for Environmental ... (0221978), NSF | Natural Variations in Sil... (9729996), NSF | Biocomplexity: The Emerge... (0083566)
  • Open Access
    Authors: 
    WOCE, WHP;
    Publisher: PANGAEA
    Country: Germany
    Project: NSERC
  • Open Access
    Authors: 
    WOCE, WHP;
    Publisher: PANGAEA
    Country: Germany