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This study highlights a significant optimization approach for the CO2 Direct Model, showcasing results that indicate over 50% speed-up efficiency through parallelization, and a reduction of RMS errors by more than 90%. The CPU time for simulations averages under one minute for each hour of integration (15-minute steps). The necessity for algorithmic and software enhancements is emphasized, particularly in reducing overhead via parallel I/O. Additionally, confounding factors related to the biosphere and the use of a biosphere tracer, COS, are discussed, with references to related literature.
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Direct Model (Miehe et al., 2002)
Optimization Approach (Sandu et al., J. Computational Physics, 2005)
#3 #2 #1 CO2 Direct Model
Adjoint Performance Results • Speed-up efficiency > 50% for parallelization • RMS error reduction > 90% of prior error • CPU time <1 minute per hour of simulation (simulation integration step 15 min) Algorithmic/Software Improvements Needed • Reduce overhead through parallel I/O • Confounding factors: biosphere
A Biosphere Tracer: COS (Campbell et al., Science, 2008)
Cost Function Error (Campbell et al., In Prep)
