great plains warm-season precipitation in a two-way nested ...€¦ · c360 (30 km) single-grid...

Great Plains Warm-season Precipitation in a Two-way Nested High-resolution GCM Lucas Harris with Shian-Jiann Lin and Jan-Huey Chen NOAA/Geophysical Fluid Dynamics Laboratory 2014 EGU General Assembly 29 April 2014, Vienna, Austria

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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

http://www.cgd.ucar.edu/events/pdes-workshop/abstracts/Harris.L.pdf

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Page 3: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

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

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

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

Page 7: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

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

Page 8: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

One day

Page 9: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

One day

Page 10: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

One day

Page 11: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

ParameterizedPrecipitation

ResolvedPrecipitation

Page 12: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

Page 13: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

mm/hr

GCIP Observations c90 (110 km) single-grid

c384 (25 km) single-grid c384n3 (8 km) nested

One

day

Page 14: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

Page 15: Great Plains Warm-season Precipitation in a Two-way Nested ...€¦ · c360 (30 km) single-grid c90n3 (40 km) nest c192n2 (25 km) nest mm/d. C384 SINGLE-GRID RESULTS PRISM Observations

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!!

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