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Annual-layer determinations and 167 year records of past climate of H72 ice core in east Dronning Maud Land, Antarctica

  • Fumihiko Nishio (a1), Teruo Furukawa (a2), Gen Hashida (a2), Makoto Igarashi (a2), Takao Kameda (a3), Mika Kohno (a2), Hideaki Motoyama (a2), Kazuhiro Naoki (a4), Kazuhide Satow (a5), Keisuke Suzuki (a6), Morimasa Takata (a2), Yoko Toyama (a1), Tomomi Yamada (a7) and Okitsugu Watanabe (a2)...

Abstract

To determine annual layers for reconstructing the past environment at annual resolution from ice cores, we employed snow-stake data back to 1972, tritium content, solid electrical conductivity measurements (ECM) and stratigraphic properties for the 73m ice core at the H72 site, east Dronning Maud Land, Antarctica. the average annual surface mass balance at H72 is 307 mma–1w.e. during the last 27 years from continuous accumulation data, 317 mma–1 w.e. according to the densification model and 311 mma–1 w.e. according to the average surface mass balance for 167 years based on annual-layer counting. the ECM age is closely coincident with tritium age, and corresponds with the snow-stake record back to AD 1972 from the surface to 15 m depth. the H72 ice core is dated as AD 1831by ECMat 73.16 mdepth.The time series of yearly surface mass balance at H72 shows an almost constant 311 mm a–1 w.e. for the last 167 years. the oxygen-isotope records indicate a significant trend to lower values, with negative gradient of 1.7% (100 years)–1.

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References

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Annual-layer determinations and 167 year records of past climate of H72 ice core in east Dronning Maud Land, Antarctica

  • Fumihiko Nishio (a1), Teruo Furukawa (a2), Gen Hashida (a2), Makoto Igarashi (a2), Takao Kameda (a3), Mika Kohno (a2), Hideaki Motoyama (a2), Kazuhiro Naoki (a4), Kazuhide Satow (a5), Keisuke Suzuki (a6), Morimasa Takata (a2), Yoko Toyama (a1), Tomomi Yamada (a7) and Okitsugu Watanabe (a2)...

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