DISTRIBUTION OF MEAN δ^O VALUES OF SURFACE SNOW LAYERS AND THEIR DEPENDENCE ON AIR TEMPERATURE IN ENDERBY LAND-EAST QUEEN MAUD LAND, ANTARCTICA

元データ 国立極地研究所

概要

Oxygen isotope analyses of surface snow layers have been carried out in Enderby Land-East Queen Maud Land, East Antarctica. The δ^<18>O values decrease with various parameters including elevation (E : m), distance from the coast (L : km) : [δ^<18>O(‰)=-0.0069E-0.0126L-18.5], and in particular with mean annual surface temperatures (T : ℃), according to a good linear relationship [δ^<18>O(‰)=0.834T-8.7] in the temperature range from -20 to -55℃. The relationship with temperature is similar to that derived from a simple model in which an air mass is progressively cooled under Rayleigh conditions as it moves toward the inland plateau. This also suggests that δ^<18>O values are very closely related to condensation temperature at the top of the inversion layer where snowfall precipitation is formed.

著者

Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Satow Kazuhide Nagaoka National College of Technology
Watanabe Okitsugu National Institute Of Polar Research
Satow Kazuhide Nagaoka College Of Technology

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