PROGRAM TITLE:	Computer Hardware, Advanced Mathematics and 
Model Physics (CHAMMP)
SCIENCE ELEMENT:	Climate and Hydrological System


DESCRIPTION:  CHAMMP will rapidly advance the science of decade to 
century climate prediction by expanding the current theoretical basis of 
climate dynamics and by the continual optimization of computer models that 
are used for climate prediction and assessment of climate change.  Current 
research emphasis falls under 4 categories: 1. Theoretical studies of decade to 
century climate change and climate variability that address the natural 
variability of the ocean and coupled ocean-atmosphere systems on decade and 
longer time scales.  Additional research is aimed at using signal processing 
theory to identify spatial and temporal patterns in climate data and model 
results that could identify climate changes. 2. Development of massively-
parallel versions of GCMs.  Assessments will be carried out with large 
atmospheric and ocean general circulation models (GCMs) that form the 
foundation of the most sophisticated climate models.  CHAMMP has actively 
supported efforts to develop and implement versions of existing climate 
GCM codes on massively-parallel scientific supercomputers.  Emphasis is on 
the development of a baseline set of codes that are both widely used and are 
representative of the models employed for long term prediction and 
assessment. 3. Research into new and better numerical techniques as well as 
improvements to existing methods used in atmospheric and ocean general 
circulation models is underway. 4. CHAMMP has supported the development 
of improved process parameterizations that can realistically simulate the 
effects of these processes on long-term climate change within GCMs.  A major 
emphasis is on the development of modules that have the proper scaling 
characteristics within the range of GCM resolution used in climate change 
studies.  The program has received extensive peer review including JASONs.

STAKEHOLDERS: Major modeling centers (NOAA/GFDL, NCAR) are either 
directly participating in CHAMMP or are collaborating with CHAMMP 
researchers to improve models used for climate research and climate change 
assessment. Climate Change is a major "Grand Challenge" Application focus 
for the DOE HPCC program.  CHAMMP provides a key link between the 
HPCC and climate modeling research communities that accelerates the 
application of HPCC research to climate modeling.

SHORT-TERM POLICY PAYOFFS:  The Semtner-Chervin global ocean 
model, which is substantially supported by CHAMMP, and the NCAR 
Community Climate Model Version 2 (CCM2), which is partially CHAMMP 
supported,  have been adapted by NCAR researchers to perform coupled 
model runs as part of the next integrated assessment.  Highly optimized 
modeling codes that can be run on massively-parallel scientific 
supercomputers are nearly completed.  These models will form the 
foundation for future climate change simulations used for integrated 
PROGRAM CONTACT: David Bader, DOE, ER-74, Washington, D.C. 301-903-