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Difference between SNOTTOPL and TG in CLM history output (CLM4.0)?

F

fyke@lanl_gov

Member
Hi (again!),I am wondering about the difference between the SNOTTOPL ('snow temperature (top layer)') and TG ('ground temperature') output fields in CLM4.0, since it appears to me as though these variables have the exact same values around Antarctica (where I am currently interested).Is my assumption correct, that the output value for TG is actually the temperature of the top snow layer and not the temperature of the top soil layer, if snow exists?  Alternately, it would surprise me quite a bit if the top soil layer and the top snow layer temperatures were actually identical, even with snow height SNOWDP > 1m.What confuses me slightly, is that there ARE sporadic spatial regions that exhibit large differences between these two fields, in areas of what appear to be seasonal snow in the northern hemisphere.One other note: the units for SNOTTOPL are K/m in the output history file, which seems incorrect (should it just be K?).Thanks for your help, again,Jeremy 
 
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