Water Research Institute, Nagoya University
Water Research Institute, Nagoya University
抄録(英)
Oxygen isotopic composition (δ^<18>O) in the cores from the Antarctic and Greenland ice sheets provides important information about paleoclimatic records. However, the interpretation of the δ^<18>O values in the cores is not always easy. Mizuho Station is under the influence of a stationary katabatic wind. Periods of erosion, deposition and neither occur on the snow surface around Mizuho Station. Therefore, the interpretation of δ^<18>O values in the cores from the station are more complicated. In the present study was discussed how to obtain information about paleoclimatic records from δ^<18>O in the cores. δ^<18>O values of thick and fine-grained layers with little-developed depth hoar were considered to provide the best information about paleo-temperature records, taking into consideration the following factors : 1) Snow does not always accumulate in every season. 2) A glazed surface is occasionally exposed over one year, resulting in an interruption in the annual layer (s). Subsequent movement of water vapor in firn occurs during depth hoar formation under a large temperature gradient. 3) The variation in annual air temperature is best shown by the air temperature in winter. The profile of δ^<18>O of such layers of one core agrees well with the profile of δ^<18>O of the long depth interval of another core, which is considered to provide information about the trend of variation of mean air temperature in the long term.
雑誌書誌ID
AA00733561
雑誌名
Memoirs of National Institute of Polar Research. Special issue
Oxygen Isotope Profiles in Adjacent Cores from Mizuho Station, East Antarctica
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KJ00000011712
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概要
