This small amount of projected deep ocean warming is unlikely to dissociate much hydrate. At such a slow rate of warming, it would indeed be several centuries, if not much longer, before even the free gas and hydrate closest to the sediment surface began to be released. That is, if it took a significant heat pulse (of say, 6°C, or 10.8°F) to release continental margin methane. But it does not. At least some free gas below the hydrates, remember, may be at threshold conditions, right now (Zühlsdorff and Spieß, 2004). That means that any warming whatsoever -- including the tiny amount of warming which has already occurred -- may be enough to trigger the release of at least some methane. Like the teapot on the stove in which the water has started boiling, any increase in global heat can set the whistle blowing -- or the methane flowing. How much methane will be released is something we will discover, but in view of the huge amounts of methane available in the continental margins, even a little may be sufficient to dramatically alter climate.
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posted by psmealey at 8:27 AM on October 13, 2005