Methodology for use of isotopic climate forcings in ice sheet models

Details Methodology for use of isotopic climate forcings in ice sheet models Methodology for use of isotopic climate forcings in ice sheet models

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3065c&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 19, p. 3065-3068

Statistics

Methodology

11

Global Change: Climate Dynamics, Hydrology: Frozen Ground, Hydrology: Glaciology, Hydrology: Snow And Ice

Scientific paper

In ice sheet models, an internally consistent calculation of climatic temperature forcing from ice-core isotopic records (δ) requires that corrections be made for an ice core site's elevation changes. Such corrections can be important for two reasons. First, elevation change at an ice divide can be large compared to elevation change at the migrating ice margin, resulting in erroneous estimates of marginal melt rate. Second, the δ of precipitation at an ice divide responds less to regional climatic temperature changes than to local temperature changes of the same magnitude that are caused by elevation changes. Significant elevation-change corrections may also be necessary for inferring the relationships used to calculate climatic temperature from δ. A simple methodology incorporating both of these elevational effects is presented here. Further, I recommend that the δ to temperature conversion relations used in ice sheet models should derive from independently reconstructed temperature and δ time-series rather than from spatial correlations, and justify this recommendation based on current understanding of the atmospheric isotopic distillation system.

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