1 / 17

A FIRST LOOK AT THE MODIS 8-DAY PSN DATA FOR 2001

A FIRST LOOK AT THE MODIS 8-DAY PSN DATA FOR 2001. MODIS Science Team Mtg 19 December 2001 Steven W. Running NTSG, Univ. of Montana. . MODIS Photosynthesis. The Monteith equation…. Absorbed Photosynthetically Active Radiation. Radiation Use Efficiency. GPP =. x. APAR.

tracey
Download Presentation

A FIRST LOOK AT THE MODIS 8-DAY PSN DATA FOR 2001

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. A FIRST LOOK AT THE MODIS 8-DAY PSN DATA FOR 2001 MODIS Science Team Mtg 19 December 2001 Steven W. Running NTSG, Univ. of Montana

  2. MODIS Photosynthesis The Monteith equation…. Absorbed Photosynthetically Active Radiation Radiation Use Efficiency GPP = x APAR (FPAR)(0.45Rnet )

  3. Photosynthesis Under Optimum Conditions MODIS Photosynthesis Epsilon is the slope of the line described by GPP =  APAR

  4. Maximum Radiation Use Efficiency under ideal conditions for each biome Vapor Pressure Deficit Coefficient Temperature Coefficient for each biome Radiation Use Efficiency  = max [mtmin ][mvpd ] The coefficients are calculated from daily minimum and maximum air temperature which are therefore necessary inputs to the model

  5. VPD & Tmin Coefficients All Biomes Grassland Biome Tmin_max Tmin_min VPD Tmin Tmin_max & Tmin_min are Tabulated by biome

  6. ESTIMATION OF DAILY NPP IN MOD17 ALGORITHM

  7. MODIS 8-day PSN Winter 2001

  8. MODIS 8-DAY PSN SUMMER 2001

  9. Park Falls 5x5 km MODIS 8-day LAI Product Park Falls forest site 17MAY2001 – 16OCT2001 The variability in LAI around the flux tower is shown by the scatter of blue (3x3 km) and green (5x5 km) dots. LAI of center pixel LAI field data Co-Kriged Aug 2000 Gower et al. Land Cover around tower Davis et al.

  10. MODIS Cutouts: fPAR for Park Falls All pixels in 5x5 cutout Green=rejected Blue=accepted Accepted pixels

  11. FLUXNET GRASSLAND SITES

  12. FLUXNET FOREST SITES

  13. SUMMARY3 Sources of variability of MODIS PSN1. Radiometric – MODIS FPAR and LAI2. Meteorological – DAO IPAR and Temps3. Ecological – MOD 17 representation of plant physiologyEach require a different mode of validation

More Related