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Datasets with PANGAEA technical keyword @ice

Mostrando recursos 1 - 20 de 185

  1. Seasonally resolved chemical records of six ice cores from the Dronning Maud Land, Antarctica

    Sommer, Stefan; Wagenbach, Dietmar; Mulvaney, Robert; Fischer, Hubertus
    The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on...

  2. Seasonally resolved chemical records of six ice cores from the Dronning Maud Land, Antarctica

    Sommer, Stefan; Wagenbach, Dietmar; Mulvaney, Robert; Fischer, Hubertus
    The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on...

  3. Seasonally resolved chemical records of six ice cores from the Dronning Maud Land, Antarctica

    Sommer, Stefan; Wagenbach, Dietmar; Mulvaney, Robert; Fischer, Hubertus
    The ammonium, calcium, and sodium concentrations from three intermediate depth ice cores drilled in the area of Dronning Maud Land, East Antarctica, have been investigated. Since all measurements were performed by a high-resolution Continuous Flow Analysis system, for the first time seasonal signals of chemical trace species could be obtained from the interior of central Antarctica over a period of approximately 2 millennia. Although the elevation as well as the accumulation rate differ between the drilling sites, similar values were obtained by comparing mean concentrations spanning the last 900 years. However, a distinct lack of intersite correlation was found on...

  4. Age models of five ice cores from the Dronning Maud Land, Antarctica

    Sommer, Stefan; Appenzeller, C; Röthlisberger, Regine; Hutterli, Manuel A; Stauffer, Bernhard; Wagenbach, Dietmar; Oerter, Hans; Wilhelms, Frank; Miller, Heinz; Mulvaney, Robert
    For the first time, annually resolved accumulation rates have been determined in central Antarctica by means of counting seasonal signals of ammonium, calcium, and sodium. All records, obtained from three intermediate depth ice cores from Dronning Maud Land, East Antarctica, show rather constant accumulation rates throughout the last 9 centuries with mean values of 63, 61, and 44 mm H2O yr**-1 and a typical year-to-year variation of about 30%. For the last few decades, no trend was detected accounting for the high natural variability of all records. A significant weak intersite correlation is apparent only between two cores when the...

  5. Age models of five ice cores from the Dronning Maud Land, Antarctica

    Sommer, Stefan; Appenzeller, C; Röthlisberger, Regine; Hutterli, Manuel A; Stauffer, Bernhard; Wagenbach, Dietmar; Oerter, Hans; Wilhelms, Frank; Miller, Heinz; Mulvaney, Robert
    For the first time, annually resolved accumulation rates have been determined in central Antarctica by means of counting seasonal signals of ammonium, calcium, and sodium. All records, obtained from three intermediate depth ice cores from Dronning Maud Land, East Antarctica, show rather constant accumulation rates throughout the last 9 centuries with mean values of 63, 61, and 44 mm H2O yr**-1 and a typical year-to-year variation of about 30%. For the last few decades, no trend was detected accounting for the high natural variability of all records. A significant weak intersite correlation is apparent only between two cores when the...

  6. Stable-isotope records from Dronning Maud Land, Antarctica

    Graf, Wolfgang; Oerter, Hans; Reinwarth, Oskar; Stichler, Willibald; Wilhelms, Frank; Miller, Heinz; Mulvaney, Robert
    The European Project for Ice Coring in Antarctica (EPICA) includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land. This paper focuses on the investigation of the 18O content of shallow firn and ice cores. These cores were dated by profiles derived from dielectric-profiling and continuous flow analysis measurements. The individual records were stacked in order to obtain composite chronologies of 18O contents and accumulation rates with enhanced signal-to-noise variance ratios.These chronologies document variations in the last 200 and 1000 years.The 18O contents and accumulation rates decreased in the 19th century and increased during the 20th...

  7. Stable-isotope records from Dronning Maud Land, Antarctica

    Graf, Wolfgang; Oerter, Hans; Reinwarth, Oskar; Stichler, Willibald; Wilhelms, Frank; Miller, Heinz; Mulvaney, Robert
    The European Project for Ice Coring in Antarctica (EPICA) includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land. This paper focuses on the investigation of the 18O content of shallow firn and ice cores. These cores were dated by profiles derived from dielectric-profiling and continuous flow analysis measurements. The individual records were stacked in order to obtain composite chronologies of 18O contents and accumulation rates with enhanced signal-to-noise variance ratios.These chronologies document variations in the last 200 and 1000 years.The 18O contents and accumulation rates decreased in the 19th century and increased during the 20th...

  8. Physical properties and accumulation rates in Dronning Maud Land, Antarctica

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan
    The European Programme for Ice Coring in Antarctica includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land, Antarctica. The German glaciological programme during the 1997/98 field season was carried out along a 1200 km traverse on Amundsenisen and involved sampling the snow cover in pits and by shallow firn cores. This paper focuses on the accumulation studies. The cores were dated by dielectric-profiling and continuous-flow analysis. Distinct volcanogenic peaks and seasonal signals in the profiles served to establish a depth time-scale. The eruptions of Krakatoa, Tambora, an unknown volcano, Kuwae and El Chichon are well-documented...

  9. Physical properties and accumulation rates in Dronning Maud Land, Antarctica

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan
    The European Programme for Ice Coring in Antarctica includes a comprehensive pre-site survey on the inland ice plateau of Dronning Maud Land, Antarctica. The German glaciological programme during the 1997/98 field season was carried out along a 1200 km traverse on Amundsenisen and involved sampling the snow cover in pits and by shallow firn cores. This paper focuses on the accumulation studies. The cores were dated by dielectric-profiling and continuous-flow analysis. Distinct volcanogenic peaks and seasonal signals in the profiles served to establish a depth time-scale. The eruptions of Krakatoa, Tambora, an unknown volcano, Kuwae and El Chichon are well-documented...

  10. Physical properties of firn cores from the 1995/96 and 1996/97 field seasons

    Oerter, Hans; Graf, Wolfgang; Wilhelms, Frank; Minikin, Andreas; Miller, Heinz
    The paper focuses on studies of snow-pit samples and shallow firn cores taken during the 1995-96 and 1996-97 field seasons at Amundsenisen, Dronning Maud Land, Antarctica. The dating of the firn is based on the artificial tritium distribution in the snow cover and on several reference horizons identified by electrical measurements. The early 1964 through 1965 horizon is marked by the deposition of sulfate released to the atmosphere during the eruption of the Agung volcano in March 1963; this horizon was detected by dielectric profiling and electrical conductivity measurements; the proof by chemical analysis has still to be seen. At...

  11. Physical properties of firn cores from the 1995/96 and 1996/97 field seasons

    Oerter, Hans; Graf, Wolfgang; Wilhelms, Frank; Minikin, Andreas; Miller, Heinz
    The paper focuses on studies of snow-pit samples and shallow firn cores taken during the 1995-96 and 1996-97 field seasons at Amundsenisen, Dronning Maud Land, Antarctica. The dating of the firn is based on the artificial tritium distribution in the snow cover and on several reference horizons identified by electrical measurements. The early 1964 through 1965 horizon is marked by the deposition of sulfate released to the atmosphere during the eruption of the Agung volcano in March 1963; this horizon was detected by dielectric profiling and electrical conductivity measurements; the proof by chemical analysis has still to be seen. At...

  12. Density of firn core DML28C01_00

    Oerter, Hans

  13. Density of firn core DML28C01_00

    Oerter, Hans

  14. Accumulation rate of firn core DML17C98_33 (B33)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  15. Accumulation rate of firn core DML17C98_33 (B33)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  16. Accumulation rate of firn core DML07C98_31 (B31)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  17. Accumulation rate of firn core DML07C98_31 (B31)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  18. Accumulation rate of firn core DML05C98_32 (B32)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  19. Accumulation rate of firn core DML05C98_32 (B32)

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

  20. Accumulation rate of firn core DML23C98_12

    Oerter, Hans; Wilhelms, Frank; Jung-Rothenhäusler, Frederik; Göktas, Fidan; Miller, Heinz; Graf, Wolfgang; Sommer, Stefan

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