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Global budget of water isotopes inferred from polar ice sheets
Author(s) -
Lhomme Nicolas,
Clarke Garry K. C.,
Ritz Catherine
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl023774
Subject(s) - cryosphere , ice sheet , ice core , geology , δ18o , sea ice , ice stream , ice shelf , antarctic sea ice , antarctic ice sheet , polar , ice divide , oceanography , climatology , stable isotope ratio , quantum mechanics , physics , astronomy
Water isotope ratios in ice cores and marine sediments are a key indicator of past temperature and global ice volume. Quantitative interpretation of these ratios requires understanding of the storage capacity and exchanges among the ocean, atmosphere, and cryosphere. We combine numerical models of ice dynamics and tracer transport to predict bulk ice properties by simulating the fine layering of ice sheets locally validated at ice core sites. The 18 O/ 16 O content of ice sheets is found to vary between the present and 20 kyr ago from −34‰ to −37‰ for Greenland, from −41‰ to −42.5‰ for West Antarctica, and always remained near −56.5‰ for East Antarctica. Their combined effect on sea‐water 18 O/ 16 O is a 0.08–0.12‰ increase 20 kyr ago, a 1.11‰ decrease if ice sheets were to vanish. We confirm that ice volume changes in Antarctica and Greenland linearly affect ocean composition, though at different rates.