[Vision2020] Snow storms and global warming

Paul Rumelhart godshatter at yahoo.com
Thu Feb 11 12:33:00 PST 2010


I've seen lots of articles on the web that describe how the current record-breaking weather on the East Coast does not disprove global warming.  Here is a sampling:

http://mediamatters.org/research/201002090032
http://voices.washingtonpost.com/ezra-klein/2010/02/no_the_snow_does_not_disprove.html
http://thinkprogress.org/2010/01/12/cold-snap-global-warming/

I don't dispute this. I'm pretty sure that global warming is happening on larger timescales; I am just skeptical of the anthropogenic component being as powerful a forcing as climate scientists and political leaders would like us to believe.  

It does lead me to wonder about one thing, though.  What kind of a winter would it take to disprove global warming?

A mild winter would likely be blamed on the overall temperature increase, where a stormy winter would likely be blamed on there being more moisture in the air and more energy in the system.  Would a winter that was average in all ways be enough?  Since winters vary so much over the years, what would a completely average winter look like?  Would it take a winter that lasted all year?  If it's likely that no winter that could reasonably be expected to occur would disprove it, then is it meaningful to say that the current weather was predicted by the AGW hypothesis?

I've also been pondering the role of moisture in global temperature.  If the moisture content of the air is indeed increasing, wouldn't that mean more snowfall and more clouds?  Both of which change the albedo of the Earth a significant amount which would cause more sunlight to be reflected back into space.  Would this serve as a negative feedback process?  From what I've read, the affect on clouds on global warming is one of the biggest open-ended questions out there right now.

Just curious what other people thought.

Paul



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