great plains warm-season precipitation in a two-way nested ...€¦ · c360 (30 km) single-grid...
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Great Plains Warm-season Precipitation in a Two-way
Nested High-resolution GCMLucas Harris
with Shian-Jiann Lin and Jan-Huey ChenNOAA/Geophysical Fluid Dynamics Laboratory
2014 EGU General Assembly29 April 2014, Vienna, Austria
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A message from our sponsor
•Nonhydrostatic core
• 1 km: c512 stretchedby 20 (global model!!)
• Solo core with warm-rain microphysics
http://www.gfdl.noaa.gov/visualizations-mesoscale-dynamics
M. Toy splitting supercelltest case
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WESTERN US DJF PRECIPITATION
PRISM Observations
c90 (110 km) single-grid c192 (50 km) single-grid
c90n3 (40 km) nest c192n2 (25 km) nest
mm/d
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JJA PRECIPITATIONPRISM Observations c90 (110 km) single-grid c192 (50 km) single-grid
c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest
mm/d
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C384 SINGLE-GRID RESULTSPRISM Observations c360 (30 km) single-grid c384 (25 km) single-grid
c384 Alternative configuration
mm/d mm/d
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• c384 global grid (25 km)
• Factor-of-three nest (8 km) over CONUS
• 8 mo/day with 4248 cores (c384 single-grid: 19 mo/day with 3456 cores)
New nest: c384n3
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C384 AND C384n3
c384n3 (8 km) nested
PRISM Observations c360 (30 km) single-grid c384 (25 km) single-grid
c384 Alternative configuration
mm/d mm/d
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One day
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One day
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One day
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ParameterizedPrecipitation
ResolvedPrecipitation
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mm/hr
GCIP Observations c90 (110 km) single-grid
c384 (25 km) single-grid c384n3 (8 km) nested
One
day
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CONCLUSIONS
• Enhanced resolution readily improves representation of orographic precipitation and hurricane intensity
• Great Plains precipitation only improves weakly with increasing resolution
•Nesting to 8 km gets the best results, especially in representing propagating features in the Northern Plains
•Want to avoid parameterization as much as possible to get the diurnal cycle right!!