This study involves the use of an isotope-capable general
circulation model to quantify geographic, global climatic, and orbital
effects on the oxygen isotopic composition of precipitation during warmer-than-modern climates. An extensive series of sensitivity tests is being performed
using the GENESIS general circulation model (GCM) with water isotope
tracers included in the hydrologic cycle (Mathieu et al., 2000). The experiments use boundary conditions appropriate for the modern, the early Paleogene and the Cretaceous intervals with the aim of examining variability in the isotopic
composition of rainfall, continental runoff, and high latitude snowfall
over a variety of boundary conditions and time scales.
Quantification of plausible ranges in precipitation oxygen isotopes for
boundary conditions appropriate for warmer-than-modern climates allows greater confidence in estimates of paleotemperatures, water vapor
transport, and seasonality from marine and continental proxy records
that currently rely on assumptions of isotope-temperature
relationships, oxygen isotope freshwater values, and freshwater flux
To view the results of work in progress, please use the links below and to the left.
Questions and comments are welcome. Email firstname.lastname@example.org
This material is based upon work supported by
the National Science Foundation under Grant No. 0442182. Any opinions, findings, and conclusions or
recommendations expressed in this material are those of the author and do
not necessarily reflect the views of the National Science Foundation.
|2006 Fall AGU Meeting contribution|
Isotope modeling of a mid-Turonian warming event in the South Atlantic
Bice, K., Pollard, D., MacLeod, K., Huber, B. (2006) Isotope
modeling of a mid-Turonian warming event in the South Atlantic, Eos Trans. AGU,
87 (52) Fall Meet. Suppl., Abstract PP23A-1739.
|2002 Cretaceous Climate and Ocean Dynamics Workshop presentation|
What would a Cretaceous glaciation look like?
Bice, K., Pollard, D., Mathieu, R., Norris, R. (2002) What would a Cretaceous glaciation look like? Workshop on Cretaceous Climate and Ocean Dynamics, Florissant, Colorado, Abstract, [Online].
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