北極徒歩探検によって観測された海氷上の雪の安定同位体比

抄録

Stable isotopes in snow on sea ice were observed in the Canadian Arctic Sea. Twenty-three snowpack and four new snow samples were collected along the length of expedition on foot from March to May in 2011. Stable isotopes in snow ranged from -25 to -35‰ in δ¹⁸O and from 3 to 13‰ in d-excess, and the local meteoric water line (LMWL) is δD=8.4*δ¹⁸O+18.7. There are no relationships between δ¹⁸O in snow and surface air temperature in this study. Temporal variation of δ¹⁸O in snow is influenced by the direction of moisture flux, low (high) δ¹⁸O in snow exists when southwesterly (northerly or easterly) moisture flux dominants.