1 / 12

Model validation: flux sites

Model validation: flux sites. - NOAA/ATDD-Tilden Meyers flux data sets - Components of the surface energy budget: ( incoming/outgoing short/longwave radiation , latent , sensible , ground heat flux), plus meteorological observations and sub-surface temperature and soil mositure

ita
Download Presentation

Model validation: flux sites

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Model validation: flux sites - NOAA/ATDD-Tilden Meyers flux data sets - Components of the surface energy budget: (incoming/outgoing short/longwave radiation, latent, sensible, ground heat flux), plus meteorological observations and sub-surface temperature and soil mositure - 11 measurement sites across CONUS - 2+ years of data available (at NCEP)

  2. NOAA/ATDD Surface Flux Network FP SF BH BV,BP CV MO WB,CH GC AZ

  3. NCEP model vs obs MAY 2007 average fluxes H LE Ft. Peck, MT

  4. MAY 2007 avg. H, NCEP model vs obs

  5. MAY 2007 avg. LE, NCEP model vs obs

  6. LST verification 07May2006 310 300

  7. LST verification May2006 Mean

  8. LE = D(Rn-G) + rcp(esfc - eair)/ra _______________________ D + g(1+rs/ra) Using surface fluxes to evaluate land-surface physics formulations and parameters Sensible heat flux (bulk aerodynamic form): H = rcpCh(Tsfc - Tair) Latent heat flux (i.e. Penman-Monteith form): For a fully-vegetated surface: Ch = exchange coefficient (=1/ra) rs = canopy resistance (inverse canopy cond.)

  9. Transpiration processes/parameters: ...e.g., effect of vapor pressure deficit on canopy conductance: Bondville, Ill. flux site JULY 2006 soy beans(C3) corn (C4) canopy conductance (cm/s) current Noah test Noah Vapor pressure deficit (mb) T>20C,SWDN>600W/m2 · Better NLDAS results with new VPD option (next pages)

  10. To reduce low LH biases during the Summer Vapor pressure deficit function Using a narrow range of thistends to overestimate the evaporation during wet periods (spring) and underestimate the evaporation during dry periods (summer). SMHIGH and SMLOW BXEXP From Chen et al. 1996

  11. ARM/CART sites• Oklahoma Mesonet sites ARM/CART Experimental Design • CONTROL • TEST: Seasonal LAI Root Fraction Vapor Pressure Deficit Function SIMULATION PERIOD: OCT 1996 - SEP 1999

  12. Averaged over 24 ARM/CART sites CONTROL TEST

More Related