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Miscellaneous Points from Brent Lofgren

Understand the challenges in climate modeling, the importance of boundary conditions, model setups, and addressing uncertainty through ensembles of model runs. Dive into the connection between climate and economic activities.

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Miscellaneous Points from Brent Lofgren

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  1. Miscellaneous Points from Brent Lofgren CLIP Planning Workshop Nov. 14-16, 2003

  2. Strawman model setup • 60 km squares 90x80 • 20 km squares over selected area (about 30x30 would cover southern Kenya and northern Tanzania • To cover the same area, a model with grid spacing of nx requires n-3 times as many calculations as one with spacing of x.

  3. Lateral boundary conditions • These are capable of carrying information into the regional domain from distant regions, but some care in siting boundaries may be needed • A key question is, “How well are we replicating the boundary conditions from our source (GCM)?” • Method used is nudging, not fixing values to input data • Number of nudged points, linear vs. exponential • Double nesting—two-way vs. one-way

  4. February, 1993 simulated sensible heat flux

  5. RAMS vs. RegCM3 • Either will be a challenge • Previous experience on the part of a research associate will be very helpful—choice of model will hinge on candidate’s experience • RAMS has parallelized code and 2-way nesting • Snehal has had much difficulty in compiling RAMS • Realism demands that we do not consider computing speed to be the only factor in how fast we can get answers

  6. Uncertainty Issues • Uncertainty is a well-recognized issue in climate modeling • Solutions are more within reach for a worldwide network of greenhouse warming modelers than to us • Means of addressing uncertainty/stat. significance (beggars can’t be choosers): • Model runs should last many years. • Ensembles of model runs will help. • A variety of different models help to build a consensus.

  7. My Personal Climate/Weather—Economic Activity Link

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