1 / 25

AGU Poster Material

AGU Poster Material. Karl Rittger Draft. Poster will have 2 sections. Land surface properties using the MODIS satellites for Energy Balance Reconstruction Model Land surface temperature (Aqua and Terra) Net longwave equations fSCA , fVEG, fROCK, Albedo (Terra)

reegan
Télécharger la présentation

AGU Poster Material

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. AGU Poster Material Karl Rittger Draft

  2. Poster will have 2 sections • Land surface properties using the MODIS satellites for Energy Balance Reconstruction Model • Land surface temperature (Aqua and Terra) • Net longwave equations • fSCA, fVEG, fROCK, Albedo (Terra) • fSCA: reconstruction model/potential melt equation • Albedo: Net shortwave Equation • fVEG: longwave and shortwave attenuation equations that include canopy attenuation • Albedo • Net shortwave equations • Within and between basin topographic distribution of SWE • Basin Characteristics • Elevation • Streamflow • Precipitation • Vegetation • Within Basin variability

  3. Reconstruction Model

  4. Energy Balance of the Snowpackduring melt Loss of latent heat of fusion Due to meltwater leaving The snowpack Net Allwave Sensible and Latent Rainfall sensible and latent Ground heat conduction: Negligible Improve outgoing longwave: Land Surface Temperature LST Improve outgoing shortwave: Albedo α Improve melt flux: Fractional Snow Cover fSCA

  5. Improving Estimates of Melt Flux Snow Covered Area Snow Covered Area Snow Cover Depletion, Upper San Joaquin Correct SCA for Viewable Gap Fraction using National Landcover Dataset

  6. Net Shortwave Albedo, α Observed (not calculated)

  7. Net Longwave Incoming Thermal Radiation from atmosphere Incoming thermal radiation from surrounding terrain Idso formulation (Idso, 1981) Watchman Correction (Hodges et al, 1983)

  8. Effects of Vegetation on Shortwave and Longwave Canopy Density Incoming Shortwave: Nonlinear isolation transmission coefficient multiplied by incident solar radiation National Land Cover Data (NLCD) Land Cover Incoming Longwave: Weighted emissivity on basis of proportion forest cover Cline, D.W., Carroll, T.R., 1999, US Army Corp of Engineers, 1956

  9. fSCA, fVEG, fROCKBarren Pixel

  10. fSCA, fVEG, fROCK 50% Shrub- 50% Rock

  11. fSCA, fVEG, fROCK50% Shrub/50% Evergreen

  12. fSCA, fVEG, fROCK100% Evergreen

  13. MODIS LST Terra – Day/NightHigh Elevation Barren Pixel

  14. MODIS LST Terra – Day/NightHigh Elevation 100% Forest Pixel

  15. MODIS LST Terra – Day/NightLow Elevation Barren Pixel

  16. MODIS LST Terra – Day/NightLow Elevation Forest Pixel

  17. Sierra Basin Topography/Vegetation • Box-whiskers plot of elevation • Box-whiskers plot of forest fraction • Box-whiskers plot of shrub fraction • Box-whiskers plot of barren fraction

  18. Elevation of Sierra Basins

  19. Monthly Precipitation from Sierra

  20. Mean Monthly Streamflow (acre-feet)

  21. Streamflow per area (mm/m2)

  22. Sierra Wide • μ and σ of SWE with date/elevation • This shows elevations where the most snow is stored in the Sierra Nevada • μ and σ of SWE with date/latitude • This show the latitude where the most snow is stored in the Sierra Nevada

  23. Within Basin SWE distribution • μ and σ of SWE with date/elevation (within) • Show 5 representative basins 8 years • Times/elevations with largest std deviation need to be measured more frequently • Note: Highest elevations aren’t accurately represented • what about the distribution on April 1?

  24. Between Basin SWE distribution • μ and σ of SWE with date/elevation (within)

  25. Extra Ideas • Repeat with Vegetation corrected SWE • Use knowledge of subpixel land cover to constrain SCA/vegetation changes

More Related