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RUC Land Surface Model implementation in WRF Tanya Smirnova, WRFLSM Workshop, 18 June 2003. Part 1: Current and Future Initialization of WRF Land States at FSL. Goal for use of WRF in the Rapid Update Cycle.

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RUC Land Surface Model implementation in WRF

Tanya Smirnova, WRFLSM Workshop, 18 June 2003



Goal for use of wrf in the rapid update cycle
Goal for use of WRF in the Rapid Update Cycle Land States at FSL

  • 2006 - Use WRF model in Rapid Update Cycle (or Rapid Refresh) application at NCEP

  • First step – test WRF model against current RUC hydrostatic model using common RUC initial conditions

  • WRFRUC– WRF initialized with RUC-20 initial conditions, full-resolution native q/s coordinate data, including 3-d hydrometeor, land-sfc data


WRFRUC model configuration Land States at FSL

  • NCAR mass-coordinate dynamic core - v.1.2.1

  • 35 vertical sigma-p levels

  • Initial conditions including land states for WRFRUC

  • - native coordinate data from FSL RUC20 cycle including assimilation of observations not yet used in NCEP operational RUC20 – Coupled Data Assimilation System (CDAS) – available for outside users from

  • the FSL ftp site in GRIB format

  • Lateral boundary conditions from the same FSL RUC20 48h forecast

  • RUC post-processing adapted to WRF output to produce RUC look-alike GRIB output


RUC CDAS - Land States at FSLfour-dimensional system (funded by GAPP)

  • Uses a forward full-physics model

  • Cycles surface/soil fields depending on the RUC atmospheric forcing

  • Cycles 5 hydrometor species : cloud, ice, rain, snow and graupel. Cloud clearing/building based on GOES data

  • New compared to RUC operational –

  • Forecast length (48-hour forecasts with hourly outputs)

  • Assimilation of:

    • NEXRAD Radar reflectivity observations

    • GPS precipitable water

    • Boundary-layer profilers

    • Mesonet observations collected at FS

  • Main Goal: to improve 1-h precipitation forcing and the land surface model climate


RUC Control Land States at FSL

Stage IV Rainfall

24-hour precipitation accumulation

ending at 1200 UTC 6 May 2003

RUC CDAS


RUC Control Land States at FSL

Spatial Correlation fields of 24-h Accumulated Precipitation ending at 1200 UTC 6 May 2003

(Dongsoo Kim)

RUC CDAS


Diurnal cycle of biases from Land States at FSLRUC control and RUC CDAS

averaged for the period 1 December – 1 March 2003

2-m dew point

Western US

2-m temperature

Western US


  • Two WRFRUC systems run at FSL in real time: Land States at FSL

  • WRFRUC with 10-km horizontal resolution for the TAQ (Temperature and Air Quality) project

  • - 48-hour forecasts twice a day (00 and 12 UTC, runs on JET since June 2002)

  • 2. WRFRUC with 20-km horizontal resolution on

  • CONUS domain

  • - 24-hour forecasts twice a day (00 and 12 UTC, runs on JET since February 2003)

http://ruc.fsl.noaa.gov - real-time fields


Physics options used in Land States at FSLWRFRUC at FSL:

- NCEP 5-class microphysics scheme (option 4)

- RRTM longwave radiation (option 1)

- Dudhia shortwave radiation (option 1)

- Mellor-Yamada-Janjic Monin-Obukhov surface layer (option 2)

- RUC land-surface model (option 3)

- Mellor-Yamada-Janjic TKE scheme (option 2)

- Kain-Fritsch (for CONUS) and Betts-Miller - Janjic (for TAQ) cumulus parameterization (option 1, 2) as of May 2003


Schematic presentation of processes included into ruc lsm
Schematic presentation of processes included into RUC-LSM Land States at FSL

6 levels in soil – 0, 5, 20, 40, 160, 300 cm

State variables - volumetric soil moisture, soil temperature, snow cover/depth/temperature - cycled in RUC 1h cycle since 1997.


  • WRFRUC Land States at FSL initialization needed:

  • Changes to WRF SI (Brent Shaw) –

  • use of native RUC vertical coordinate rather than isobaric levels to provide initial fields of atmospheric variables including hydrometeors (vapor, cloud, ice, rain, snow, graupel)

The most recent official release of WRF SI includes all these changes


  • REAL Land States at FSL changes for WRFRUC initialization:

  • Changes to REAL(Dave Gill)

    • accommodate for level structure in RUC soil domain

    • pass through hydrometeor fields

    • Further changes needed to pass through from SI to WRF model other land-surface related variables such as:

      • 2 fields for snow temperature

      • snow density

      • water vapor mixing ratio at surface

      • liquid volumetric soil moisture and others


  • WRFRUC LSM Land States at FSLuses :

  • soil and vegetation parameters, vegetation fraction and albedo provided by WRF SI

  • cycled soil temperature and moisture from RUC20

  • (RUC and WRFRUC use the same LSM, land-use and soil classifications, and the same parameter tables)

  • cycled snow depth and temperature from RUC20

  • ice in soil is initialized in WRF

  • Atmospheric forcing is provided by WRF. Still need from WRF modeling framework:

  • precipitation type (solid versus liquid)

  • option in surface driver for implicit solution of energy and moisture budgets


Vegetation types Land States at FSL –

both provided by WRF SI

(24 USGS classes)

RUC20

  • Land-use parameters:

  • roughness length

  • emissivity

  • plant coefficient

WRF10


Soil types – Land States at FSL

both provided by WRF SI

(16 classes)

RUC20

WRF10

Soil parameters –

look-up table


Soil moisture analysis Land States at FSL

Valid 0000 UTC

17 June 2003

RUC20

WRF10


RUC10 Land States at FSL

Terrain

Elevation

(dm)

TAQ domain

RUC20


Surface temperature Land States at FSL

0000 UTC, 17 June 2003

RUC20



RUC LSM participated in: Land States at FSL

  • Project for the Intercomparison of Land-Surface Parameterization Schemes (PILPS) - Phase 2d

  • Snow Models Intercomparison Project (SNOWMIP) – Phase 1

  • RUC LSM is implemented in:

  • Operational RUC20 at NCEP

  • Real-time RUC20 at FSL (CDAS)

  • MM5 chemistry package (Georg Grell) used for

  • - air quality predictions

  • - regional climate simulations (FSL, Germany, Israel)

  • WRF model


Improved 1-d (PILPS 2d – Valdai, Russia) Land States at FSLtotal runoff and snow water equivalent forecasts with improved snow and soil physics in MAPS land-surface model

Total runoff

November 1976 - May 1977

Skin temperature

Snow water equivalent


Effects of frozen soil physics on the simulation of the melting seasons, Valdai, Russia (1966-1983)

Dates when snow ablation starts

Dates when snow pack is all melted

(Smirnova et al., JGR (2000), 105, 4077-4086)


SNOWMIP, an intercomparison of snow models: first results melting seasons,

P. Etchevers, E. Martin, R. Brown et al.

ISSW meeting, August 2002


Cycled field of snow depth melting seasons,

from operational RUC20

at NCEP

Valid at 2100 UTC

8 January 2003

7 January 2003

NESDIS daily snow cover

8 January 2003

8 January 2003


12-h forecast melting seasons,

Valid

1200 UTC

29 January

2003

RUC

WRF


18-h forecast of surface temperature from RUC and WRF melting seasons,

against RUC-20 analysis

1800 UTC 29 January 2003

RUC-10

WRF-10

RUC-20


Station verification melting seasons,

for TAQ project

Hartford, CT

9 June 2003

0000 UTC –

11 June 2003

0000 UTC

http://www.etl.noaa.gov/programs/2002/taq/verification


Station verification melting seasons,

for TAQ project

Boston, MA

9 June 2003

0000 UTC –

11 June 2003

0000 UTC

http://www.etl.noaa.gov/programs/2002/taq/verification


Station verification melting seasons,

for TAQ project

Worcester, MA

9 June 2003

0000 UTC –

11 June 2003

0000 UTC

http://www.etl.noaa.gov/programs/2002/taq/verification


12-h surface forecasts verified vs. METAR obs melting seasons,

11 April – 11 June 2003

RUC-20 vs. WRFRUC-20 – all METARs in domain


12-h winds aloft forecasts melting seasons,

– verified against rawinsonde

RUC-20 vs. WRFRUC-20


WRFRUC-20 melting seasons,

(KF cumulus)

21-h forecasts

Valid 2100 UTC

10 June 2003

RUC-20

(Grell-Devenyi cumulus)


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