Using GLDAS/LIS to Derive Optimal Land States for CFS/Noah Initialization in CTB
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Transcript of Using GLDAS/LIS to Derive Optimal Land States for CFS/Noah Initialization in CTB
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Using GLDAS/LIS to DeriveOptimal Land States for
CFS/Noah Initialization in CTB
1988 1993
July
Jesse Meng, Kenneth Mitchell, Helin Wei, and Jon Gottschalck
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When do we need initialization?
Cold start a new simulation e.g., flood, drought
Model upgrade e.g., physics, parameters, resolution
Model bias constrain• coupled – e.g., 4DDA, Reanalysis• uncoupled – e.g., GLDAS
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CFS
Current CFS T62 25-year hindcast OSU LSM Initial land states from Global Reanalysis 2 (GR2)
- T62, 25-year reanalysis, OSU LSM
Anticipated in Next-Generation CFS T126 25-year hindcast Noah LSM Initial land states from Global Reanalysis 3 (GR3)
- T126, 25-year reanalysis, Noah LSM** ** Not yet available
While awaiting coupled GR3: Uncoupled T126 GLDAS with Noah LSM will provide 25-year initial land states for T126 CFS/Noah
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Horizontal Resolution• T62 (194 x 94) T126 (384 x 190)
Land component vertical resolution• 2 soil layers (10, 190 cm) 4 soil layers (10, 30, 60, 100 cm)
OSU LSM Noah LSM• Addition of frozen soil physics• Improved physics:
snowpackevaporationground heat fluxinfiltration & runoff
Precipitation forcing: • Both use CPC CMAP precipitation, but different methodology
Other non-precip surface forcing:• Both from GR2
GR2 vs GLDAS
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NCEP Reanalysis2 2-Layer Soil Moisture00Z 01 Jan 1979
0-10 cm 10-200 cm
T62
GLDAS also needs a cold start initial condition
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GLDAS 4-Layer Soil Moisture(mapped from GR2 for 01 Jan 1979 cold start)
0-10 cm 10-40 cm
40-100 cm 100-200 cm
T126
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GLDAS 4-Layer Soil Moisture(after 5-year spinup with repeated 1979 GR2 forcing)
0-10 cm 10-40 cm
40-100 cm 100-200 cm
T126
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NCEP Reanalysis2 vs GLDAS spinup
GR2/OSU
GLDAS/Noah
January
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NCEP Reanalysis2 vs GLDAS spinup
JanuaryGR2/OSU
GLDAS/Noah
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NCEP Reanalysis2 vs GLDAS spinup
JulyGR2/OSU
GLDAS/Noah
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CONUS SubRegions
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Vol. Soil Moisture 0-10cmFive annual cycles spinup of 1979
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Vol. Soil Moisture 10-40cmFive annual cycles spinup of 1979
Deeper soil layers require longer spinup
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Vol. Soil Moisture 40-100cmFive annual cycles spinup of 1979
Deeper soil layers require longer spinup
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Vol. Soil Moisture 100-200cmFive annual cycles spinup of 1979
Has bottom soil layer in the West fully spunup?
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Vol. Soil Moisture 0-200cmFive annual cycles spinup of 1979
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Purpose: Create a 6-hourly global land-only precipitation dataset primarilybased on rain gauge observations
Datasets: CMAP Spatial: 2.5° x 2.5°, Temporal: PentadGTS land only Spatial: 0.5° x 0.5°, Temporal: DailyGR2 Spatial: 2.5° x 2.5°, Temporal: 6-hourly
Approach: (1) Disaggregate CMAP pentad precipitation to daily 0.5° x 0.5° resolution
using the GTS dataset(2) Disaggregate dataset created in (1) to 6-hourly 0.5° x 0.5° resolution
using GR2 dataset
For both (1) and (2) above: (a) Higher temporal resolution data is summed for the lower temporal resolution data period(b) Weights are calculated for each period of the higher temporal resolution data(c) These weights are applied to the lower temporal resolution data(d) Additional rules:
• If precipitation for the lower temporal resolution data > 0 but the precipitation of the higher temporal resolution data is = 0, a search is conducted in a 5° x 5° area starting from the inside out to find a suitable weight.
• If precipitation for the lower temporal resolution data = 0, final precipitation is = 0
References: Xie P., and P. A. Arkin, 1996: Global precipitation: a 17-year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bull. Amer. Meteor. Soc., 78, 2539-2558.
Optimal Precipitation Forcing
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GR2 CMAP
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CONUS SubRegions
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Daily Precipitation [mm]1979
GR2 CMAP
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25-year simulation forced withGR2 + CMAP
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Total Column Vol. Soil Moisture (0-200cm)25 years (1979-2003)
GR2 GLDAS
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Vol. Soil Moisture Anomaly 0-200cm1979-2003
GR2 GLDAS
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Vol. Soil Moisture 4 Layers1979-2003
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Vol. Soil Moisture 4 Layers1979-2003
Northern Central US
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July 1988
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July 1988anomaly
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July 1993anomaly
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Summary 25-year T126 GLDAS/Noah land states
forced with GR2+CMAP Resulting soil moisture structure is
different from GR2/OSU Results will be used to initialize
CFS/Noah hindcast testing Plan:
• Implement Higgins/Shi CPCCONUS+Mexico gauge-only daily precip
• Spinup strategye.g., annual or monthly cycles
• Initialization strategye.g., anomaly rescaling
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
April
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
October
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NCEP Reanalysis2 vs GLDAS spinup
JulyGR2/OSU
GLDAS/Noah
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1988 1993
GLDAS/Noah Total Soil Moisture
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July 1988
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GLDAS/Noah 4-Layer Soil Moisture
0-10 cm 10-40 cm
40-100 cm 100-200 cm
July 1993
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