Main menu

Navigation

Questions about the GRAZING and PCT_PFT and other variables in the surfdata.pftdyn and landuse data for CLM4 and CLM5

1 post / 0 new
xiejinbo@...
Questions about the GRAZING and PCT_PFT and other variables in the surfdata.pftdyn and landuse data for CLM4 and CLM5

Hi,

  I am tring to understand the landuse process in CLM4 and CLM5. And I find that in some inputdata (such as surfdata.pftdyn_0.9x1.25_simyr1850-2005_c091008) , 

there exists a variable such as GRAZING (grazing of herbacous pfts), and it seems the model does not read in this variable. I also could not find any information about considering grazing in the clm tech note (from 4 to 5). Does the model consider this impact at all? 

Another question is about PCT_PFT which is also in the data, does the data reads the Percentage of PFT and still adjust during the simulation?

Thirdly, in the current CLM5 landuse data for CMIP6 simulation, (such as landuse.timeseries_0.9x1.25_hist_16pfts_Irrig_CMIP6_simyr1850-2015_c170824), a FERTNITRO_CFT(nitrogen fertilizer for each crop)is added in the forcing which is used in the new cropland landunit in CLM5 with CROP model turned on, but how do we consider its impact if we are to run CLM4 or CLM4.5 with CROP model closed? Or should it be completely ignored when CROP model or older version of CLM is used?

Last of all, in still in the CMIP6 landuse data for CLM5, are UNREPRESENTED_PFT_LULCC or UNREPRESENTED_CFT_LULCC considered at all in the CLM4.5 or CLM5 model when considering transient land-use effect.

     yours,

              Jinbo

 

Who's new

  • 20171204300@...
  • poornadurga.g@...
  • lina.boljka@...
  • nuistwangjing@...
  • vineetm@...