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1 For the monthly files from L4 Ameriflux, we are comparing the |
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2 following quantities with the models: |
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3 |
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4 H_f This is sensible heat flux, in units of |
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5 W/m2/day according to Ameriflux documentation |
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6 LE_f This is latent heat flux, in units of |
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7 W/m2/day according to Ameriflux documentation |
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8 Rg_f This is global radiation, in units of MJ/m2/day |
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9 Reco_or This is the ecosystem respiration flux, in |
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10 units of gC/m2/day |
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11 NEE_or_fMDS This is the net ecosystem exchange flux, in units of |
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12 gC/m2/day |
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13 GPP_or_MDS This is the gross primary production flux, in units |
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14 of gC/m2/day |
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15 |
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16 I do not personally understand the H and LE units for the |
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17 observations and have asked Ameriflux for clarification. Please skip for now. |
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18 |
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19 For Rg_f, please compare with the model variable SOLAR. Please label: |
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20 Shortwave incoming (Wm-2) |
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21 To convert Rg_f to units of Wm-2: |
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22 |
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23 X MJ/m2/day * (1 x 10^6 J/MJ)/(24*3600s/day) = Y Wm-2 |
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24 |
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25 For Reco_or please compare with the sum of model variables ar and hr. |
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26 Please label: Re (gC/m2/day) |
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27 For NEE_or_fMDS please compare with model variable nep. Please label |
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28 NEE (gC/m2/day) |
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29 For GPP_or_MDS please compare with model variable gpp. Please label |
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30 GPP (gC/m2/day) |
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31 |
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32 The last three model variables have units of KgC/m2/s. To convert to |
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33 gC/m2/day, please use this approach: |
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34 |
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35 X Kg C/m2/s *(1000 g C/Kg C)*(3600*24 s/day) = Y gC/m2/day |
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36 |
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37 Jim |