Michael Tobis Emissions, natural or otherwise, are an *input* into what are usually called “climate models”, so no, they are not included as a feedback.
This will not be the case in the new Earth System Models coming online. I have my doubts about the validity of those ESMs, which couple geochemistry and climate, but that’s for another time and place.
There are many other sorts of models used in science and surely there is a sense in which Arctic methane is modeled somewhere, but you wouldn’t call it a “climate model”.
The linked article makes a complete hash of the methane business.
“Supersaturated” means that the water column is a methane source; it doesn’t say by how much. No evidence has been presented that the Arctic methane source has appreciably increased over preindustrial background levels, handwaving and frowning notwithstanding.
The methane inventory in the Arctic and at the sea margin is indeed enormous. But it is in places that do not warm up abruptly. If we warm the planet up enough to destabilize them, the current expectation is that they will leak out over millennia, which would not be anywhere near as bad as the abrupt release that some people insist on fantasizing about.
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