Total gas content and surface elevation of polar ice sheets

摘要: Interpretation of stable isotope profiles from polar ice cores in terms past climate requires a knowledge the elevation at which found any depth was formed. Measurement total gas content ice, V, can give such information if volume pores is known for time they close off atmosphere formation site1. For 1,387-m long core Camp Century north-west Greenland, estimates, based on assumption constant pore close-off, suggested that, average, Wisconsin/Weichsel period formed an about 1,200–1,400 m higher than that Holocene2. This would account important part large shift oxygen isotopic ratio this between late Wisconsin and Holocene observed by Dansgaard others3. However, close-off depends site origin estimates method be seriously error unless effect allowed quantitatively. We present here results enable us to describe variations has been present-day conditions Antarctica Greenland wide range temperature (−12 −53 °C) (400 3,200 m). Using these results, now applied with much greater confidence before indicate changes.