Is El Nino Really Causing the Warm Weather?
January 10th, 2007 by Carbon CoalitionThere is a nice tension between the attitudes of meteorologists and climate scientists when it comes to the mention of global warming in reference to weather events.
The weathermen pretty much don’t like it when people make that connection. And that is certainly understandable: weather is not climate.
But the recent attempts to foist the unnaturally warm weather in the Northeast off on the poor Babe of the southern Pacific, El Nino (not so little anymore, apparently) is getting irksome. Yes, the recurrent area of warm water that oscillates back and forth from Chile toward Indonesia clearly affects our weather (and by “our” I mean pretty much everyone, including those shovelers and stranded travelers in Colorado).
But data–that annoying collection of reality checks upon which scientists rely–indicates that El Nino and warm winters in the Northeast do not, in fact, correlate. Quite the opposite, as the chart below (courtesy of Dr. Cameron Wake at the UNH Climate Research Center) illustrates: El Nino (”warm events”) and La Nina (”cold events”) do not correlate with significant differences in winter temperatures across the Northeast.
Rather, the main driver of wintertime climate in the northeast, according to the climate scientists is the North Atlantic Oscillation. When it is stuck in a positive mode (as it has been for the last couple of months) it blocks the influx of Arctic air and results in warmer temperatures.
This does not exactly counter an NWS meteorologists claim that “El Nino has absolutely nothing to do with global warming” but it does indicate that El Nino may have little to do with why it’s been so ridiculously warm around here.
Thankfully not everyone is turning to El Nino. Peter N. Spotts, staff environmental writer of The Christian Science Monitor, got it right in this story on January 4th. Spotts writes:
“Is global warming responsible? Researchers aren’t sure. They point instead to a seesaw climate pattern that occurs over the North Atlantic, called the North Atlantic Oscillation or NOA. Less publicly known than El Nino and certainly less understood, the NAO is getting increasing attention from scientists…
Unlike El Nino, the phenomenon’s reach isn’t fully globe-circling. But particularly in the winter months, the NAO “is just as important for weather and climate across much of the northern hemisphere,” says James Hurrell, an atmospheric scientist at the National Center for Atmospheric Research in Boulder, Colorado.”
Of course, we can’t help noting he’s quoting an atmospheric scientist, not a meteorologist!
