Transcript NCAR R&D Related to Homeland Defense and

Verification of WRF-Noah Model Results for the
Summer Experiment Using SURFRAD Data
Mukul Tewari, Fei Chen, Kevin Manning, Wei Wang,
Jimy Dudhia(NCAR), Jerry Wegiel (AFWA)
Outline:
• Objectives
• WRF Model Configuration
• Results
– June, July 2005
• Summary
Objectives
• To verify very high resolution, very large domain
WRF model results from summer experiment
using SURFRAD (SURFace RADiation budget
network) data
• To evaluate long-term WRF surface radiation
budgets and near surface variables verified over
different landuse types
• To test the real-time capability of HRLDAS which
provided the soil data for the summer experiment
Surface Radiation Budget Network
(SURFRAD)
• Surface Radiation Budget Network (SURFRAD) was
established in 1993 through the support of NOAA's Office
of Global Programs
• Its primary objective is to support climate research with
accurate, continuous, long-term measurements of the
surface radiation budget over the United States.
• Seven SURFRAD stations are operating in climatologically
diverse regions: Montana, Colorado, Illinois, Mississippi,
Pennsylvania, Nevada and South Dakota
• Possibly sensible and latent heat flux measurements will
soon become an integral part of SURFRAD
• http://www.srrb.noaa.gov
WRF-Model Configuration
•
•
•
•
•
Single domain (4km)
No of points E-W, N-S (971X741)
35 Vertical levels
Model initialized at 00Z (integrated for 36 hrs)
Verification:
– June, July 2005 (summer experiment)
• Physics Options
–
–
–
–
–
YSU PBL
Noah LSM
RRTM radiation
Dudhia SW
WSM 6-class graupel MP
Landuse Map and Observations Sites
Fort Peck,MT
Boulder, CO
Sioux, SD Bondville, IL
Goodwin
Creek, MS
Penn State, PA
Bondville: Dryland Cropland (CAT2)
Boulder: Cropland (CAT5)
Fort Peck: Grassland/ Grassland (CAT7)
Goodwin Creek: Cropland/ Woodland (CAT6)
Penn State: Dryland Cropland (CAT2)
Sioux: Dryland Cropland (CAT2)
Observed Time Series SWDOWN
June 2005
Days 1-10
Days 11-20
Bondville, IL
Boulder, CO
Days 21-30
Verification for a Clear Day at Bondville, IL
24 July 2005
GSW
SWDOWN
Wind
Speed
GLW
Red: Observed; Blue: Model
Verification for a Clear Day at Boulder, CO
29 July 2005
SWDOWN
GLW
Red: Observed; Blue: Model
GSW
Wind
Speed
Verification for a Cloudy Day at Bondville, IL
27 July 2005
SWDOWN
Red: Observed; Blue: Model
GSW
GLW
Wind
Speed
Verification for a Cloudy Day at Boulder, CO
26 July 2005
SWDOWN
GLW
Red: Observed; Blue: Model
GSW
Wind
Speed
Bias for all Stations (Clear Days)
June 2005
SWDOWN
WIND SPEED
GSW
GLW
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
Bias for All Stations (Cloudy Days) June
2005
SWDOWN
GLW
GSW
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
Probability Distribution Function (PDF) for
Wind Speed (June and July 2005)
June
July
RMSE for all Stations (Clear Days)
JUNE
JULY
SWDOWN
GLW
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
RMSE for All Stations (Cloudy days)
JUNE
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
JULY
SWDOWN
GLW
RMSE for all Stations (Clear + Cloudy)
June 2005
GSW
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
SWDOWN
GLW
Bias for all Stations (Clear + Cloudy)
June 2005
GSW
SWDOWN
Black: BON
Red: TBL
D Blue: FPK
Green: GWN
L Blue: PSU
Purple: SXF
GLW
A Simple Approach for detection of
cloudy events
• Cloud detection was done using “DSW Baseline” defined
separately for each station and each month.
• First the Expected Clear Sky DSW (ECS-DSW) was
determined for every 3-minute using all available DSW
observations at a station during a month. ECS-DSW is
defined as the average of top 20% DSW values at a given
time.
• ECS-DSW diurnal curve was smoothed using a low-pass
filter.
• DSW-Baseline was defined as 80% of ECS-DSW
• Same DSW baseline was used for model as well as for
stations.
Detection of Cloudy and Clear Days
June 2005
Clear
days
Cloudy
days
Landuse based Verification for 15 June 2005
2m Temperature
Wind Speed
RED: Dryland Cropland, Blue: Cropland, Black: Grassland
Green: Shrubland, Yellow: Evergreen Needleleaf Forest
Landuse based Verification for 15 June 2005
RH
2m Q
RED: Dryland Cropland, Blue: Cropland, Black: Grassland
Green: Shrubland, Yellow: Evergreen Needleleaf Forest
Summary
• WRF model radiation and near surface results are evaluated
for summer experiment. The model shows good agreement
for SW radiation with observations for clear days.
• Model shows systematic positive bias in forenoon hours
and negative bias during afternoon hours for clear days.
• Cropland generally has lower bias in temperature among all
the landuse categories used for verification. Grassland and
Shrubland seems to contribute more toward bias in
temperature.
• More comprehensive verification is in process.