Forcing disaggregation tool

[jhamman]

From @tbohn via personal communication:

I think you're planning on adding disaggregation of P to the tool, right? I can point you to my code that does this, if you haven't got it already.

In addition, it's possible to estimate fdir (fraction of solar that is direct) from tskc. This hasn't been done previously in VIC, but there's a fairly simple equation relating fdir tskc (which only you have access to, in your tool, at this point). I can point you to a reference for it.

If we incorporate that equation into the tool, then all necessary carbon inputs can be estimated without being supplied. Thus, your tool could produce all of these variables (Catm, coszen, fdir, and par) optionally if the user wants to run carbon in VIC.

Of course, these inputs are specific to the carbon stuff that I added to VIC. I don't know what your plans are for the CN module - whether that will become the official carbon module for VIC. Presumably it would need similar inputs, but maybe it computes them itself.

... and it turns out that I'm wrong; fdir is estimated in MTCLIM.

[jhamman]

@tbohn -

Yes, I will be including a few disaggregation methods in the next version of this tool. Those are summarized by variable below:

• Precipitation
  • Constant over a day
  • Triangular method from @tbohn (I have a copy of this code already)
  • Pandas interpolation options (e.g. linear, cubic, spline, etc.). Daily totals must not change.
• Air temperature
  • Hermite polynomials
  • Pandas interpolation options (e.g. linear, cubic, spline, etc.)
• Shortwave
  • Average quantity from shortwave calculation in mtclim
• Longwave
  • Calculated using subdaily air temperature
• Pressure
  • Constant
• Specific humidity
  • Calculated using subdaily air temperature
• Wind
  • Constant over a day
  • Pandas interpolation options (e.g. cubic, spline, etc.)