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Jeff Amthor amthor at targa.llnl.gov
Wed May 1 15:51:52 EST 1996


Applications are invited for postdoctoral scientists to work with a team of
scientists building and evaluating a model of the global carbon cycle at
Lawrence Livermore National Laboratory (LLNL). The carbon cycle model is made
up of a terrestrial (land) carbon cycle model and an ocean
circulation/biogeochemistry model. The positions are for one year, with the
possibility of renewal based on project funding.

The terrestrial carbon cycle model includes C3 and C4 photosynthesis, plant
maintenance respiration, plant growth respiration, and decomposition of soil
organic carbon. The component submodels are now simple, and extensions and
enhancements are desired. The model has a spatial resolution of 1 degree
latitude by 1 degree longitude, and has a nominal time step of 1 hour. These
model characteristics can be changed if necessary. A water balance
(precipitation, canopy interception, evaporation of water stored on the canopy,
transpiration, soil surface evaporation, and runoff/recharge) is included in
the terrestrial carbon cycle model. Model applications include simulations of
terrestrial carbon exchange from preindustrial times to the present,
explaining the causes of interannual variability in atmospheric [CO2] increase
during the 1980's and 1990's, and predicting future atmospheric [CO2].

The ocean carbon cycle model includes inorganic and organic carbon cycling,
based on the models of Maier-Reimer, Najjar, Archer, and others. The ocean
biogeochemistry model is evaluated by comparison with ocean tracers, including
carbon isotope abundances, and other observations, in part through a
collaboration with the Center for Accelerator Mass Spectrometry (CAMS) at LLNL.

Candidates should have experience with some aspect(s) of carbon cycle research,
FORTRAN programming, and computer modeling. Experience with UNIX, large
datasets, and team projects is advantageous.

U.S. citizenship is required for most positions. Non-U.S. citizenship may limit
employment opportunities within the Laboratory.

Please reply to (including e-mail address):

Jeff Amthor
Leader, Biogechemical Cycles Group
Environmental Programs Directorate
Lawrence Livermore National Lab, L-256
PO Box 808
Livermore CA 94550

Amthor at LLNL.gov

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