1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/ameriflux/note.unit	Mon Jan 26 22:08:20 2009 -0500
     1.3 @@ -0,0 +1,37 @@
     1.4 +For the monthly files from L4 Ameriflux, we are comparing the
     1.5 +following quantities with the models:
     1.6 +
     1.7 +H_f                       This is sensible heat flux, in units of
     1.8 +W/m2/day according to Ameriflux documentation
     1.9 +LE_f                     This is latent heat flux, in units of
    1.10 +W/m2/day according to Ameriflux documentation
    1.11 +Rg_f                      This is global radiation, in units of MJ/m2/day
    1.12 +Reco_or                This is the ecosystem respiration flux, in
    1.13 +units of gC/m2/day
    1.14 +NEE_or_fMDS     This is the net ecosystem exchange flux, in units of
    1.15 +gC/m2/day
    1.16 +GPP_or_MDS      This is the gross primary production flux, in units
    1.17 +of gC/m2/day
    1.18 +
    1.19 +I do not personally understand the H and LE units for the
    1.20 +observations and have asked Ameriflux for clarification. Please skip for now.
    1.21 +
    1.22 +For Rg_f, please compare with the model variable SOLAR. Please label:
    1.23 +Shortwave incoming (Wm-2)
    1.24 +To convert Rg_f to units of Wm-2:
    1.25 +
    1.26 +X MJ/m2/day * (1 x 10^6 J/MJ)/(24*3600s/day) = Y Wm-2
    1.27 +
    1.28 +For Reco_or please compare with the sum of model variables ar and hr.
    1.29 +Please label: Re (gC/m2/day)
    1.30 +For NEE_or_fMDS please compare with model variable nep. Please label
    1.31 +NEE (gC/m2/day) 
    1.32 +For GPP_or_MDS please compare with model variable gpp. Please label
    1.33 +GPP (gC/m2/day) 
    1.34 +
    1.35 +The last three model variables have units of KgC/m2/s.  To convert to
    1.36 +gC/m2/day, please use this approach:
    1.37 +
    1.38 +X Kg C/m2/s *(1000 g C/Kg C)*(3600*24 s/day) = Y gC/m2/day
    1.39 +
    1.40 +Jim