Weather-Climate ConnectionA THORPEX ThemeJulian WangNOAA Office of Ocean & Atmosphere ResearchSilver Spring, MD

In collaboration with UIUC, CSU,

Weather Climateassimilation, ensemble, physics I CBCHours7 days14 daysYearsMonths2 weeksTHORPEX

Development of CWRF

Weather Research and Forecast ModelClimate-This extension incorporates all WRF functionalities for NWP while enhancing the capability for climate applications.Hence the CWRF can be applied for both weather forecasts and climate predictions.Climate Extension of WRF

CWRF Physics Options

Lateral Boundary optimal buffer zone (planetary-mesoscale energy/mass exchange) Land Surface Model - surface-atmosphere interaction (planetary boundary layer, land surface and terrestrial hydrology)

Convection-Cloud-Radiation Feedback cumulus, cloud microphysics, cloud formation, and radiative transfer (lower cloud)

CWRFSurface Boundary ConditionsUSA SBCs

Surface Characteristic Identification (SCI)

Bedrock, Lakebed or Seafloor Depth (DBED)

Soil Sand and Clay Fraction Profile (SAND, CLAY)

Land Cover Category (LCC)

Terrain Height

Terrain Height Cross-section: Shaping

Comparison in LBCs Mapping

Comparison in LBCs Mapping

CWRFRemote Sensing Data AssimilationSurface Albedo

OLDNEWSavanna

SavannaOLDNEWVisNirDirDifDirDif

CWRFClimate-Hydrology Interaction3D Volume Averaged Soil Moisture Transport Model VAST

Atmosphere-Land Interaction

LandSurfaceModelRegionalClimateModel

3-D VAST based on Richards equation

Concept of 3-D Volume Averaged Soil-moisture Transport model

CWRF ApplicationsMay 2003 Tornado extreme seasonin the United States,morethan 600 observed withinone month.

SummaryThe improved model physics of the CWRF provides possibility for weather-climate application. The CWRF improvements has been, or will be implemented in the DTC and further WRF release.The CWRF physics modules are independent of dynamic core. Australia NMC and the CMA are adapting the CWRF in their operational model system. The CWRF is coupling with sea ice model for IPY applications.