Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle

Details Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle Modeling the oxygen-isotopic composition of the North American Ice Sheet and its effect on the isotopic composition of the ocean during the last glacial cycle

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3315706s&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 15, CiteID L15706

Mathematics

Logic

6

Cryosphere: Ice Sheets, Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Global Change: Earth System Modeling (1225), Atmospheric Processes: Paleoclimatology (0473, 4900), Oceanography: Biological And Chemical: Stable Isotopes (0454, 1041)

Scientific paper

We used a 2.5-dimensional thermomechanical ice-sheet model including the oxygen-isotope ratio 18O/16O as a passive tracer to simulate the isotopic composition (δ18O) of the North American Ice Sheet (NAIS) during the last glacial cycle. This model allowed us to estimate the NAIS contribution to the change of seawater δ18O (δw) between the Last Glacial Maximum (LGM) and the Holocene and to evaluate the effect of nonequilibrium isotopic composition of the NAIS on the relationship between ice-volume variations and the ocean isotopic enrichment. The enrichment due to the NAIS at the LGM was 0.63‰, corresponding to ~60% of the LGM sea-level lowstand and to a mean δ18O of the NAIS of approximately -31‰. The modeled NAIS volume variations and the induced δw changes over the past 120,000 years indicated no significant time lag. The inaccuracy associated with linearly inferring ice-volume variations from δw changes was generally less than 10%.

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