Abstract
We describe the isotope-capable Land Surface Model (LSM) developed at NASA Goddard Institute for Space Studies (GISS). This model is a part of the GISS ModelE General Circulation Model (GCM), which includes the water isotopes H 2 18O and HDO as tracers in every aspect of the model's hydrological cycle. We discuss results for the soil isotopes from a number of full GCM simulations. In particular, we focus upon the spin up and equilibrium behavior of the isotope fields in a present day (ca. 1980) control simulation and the response of the isotopes to forcings over transient AMIP-style 20th century simulations. In addition, we investigate whether the isotope fields are affected by a change in the runoff algorithm, and so examine whether the isotope fields have the potential to constrain model land surface physics.
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