Disallow explicit finite difference soil temperature scheme about vic

[tbohn]

Another advantage of removing the explicit scheme would be a major simplification of the soil temperature code.

[tbohn]

Issue #66 would make the implicit scheme the default, without getting rid of the explicit scheme entirely. I'm suggesting issue #66 for VIC 4.2, with the idea that removing the explicit scheme entirely could happen at any later time.

I had forgotten about this issue when I opened issue #66, but the two issues potentially could be slated for different releases. Sorry if this is causing needless issue churn. Please feel free to rearrange/combine any of these issues as you see fit.

[tbohn]

I don't understand - you really want to remove the explicit scheme for 5.0? We still don't have a fix for frozen soil behavior; Tara Troy's code only works in the explicit mode. I really don't think we can do this for 5.0.

[bartnijssen]

@tbohn: Joe and are sitting/standing here laughing given your comment "I don't understand ..." in an issue that only has previous comments from you. Imagine how the rest of us feel :-)

[tbohn]

Sorry about any confusion. What exactly do you want to have happen? Just insert logic that exits with error if explicit is selected (easy) or remove all explicit-mode code from the model (harder)? I'm worried that this is a potential can of worms that we don't want to open before the release of 5.0.

[jhamman]

Agreed. We can move this to 5.1. This isn't related to the refactor and is best placed in 5.1.