Scientists quoted in a past DailyTech article link the cooling to reduced solar activity which they claim is a much larger driver of climate change than man-made greenhouse gases. The dramatic cooling seen in just 12 months time seems to bear that out.
Yes, they have repeated, yet again, that same misrepresentation of Tapping’s views. I expect Drudge and co will do it yet again in a few more days.
Asher also claims:
All four major global temperature tracking outlets (Hadley, NASA’s GISS, UAH, RSS) have released updated data. All show that over the past year, global temperatures have dropped precipitously.
But if you look at a graph of GISS temperatures, you see that 2007 was warmer than 2006 and was tied for second place as the warmest year on record.
What Asher was basing his claim on was the average temperature for just one month. January 2008 was 0.65 degrees colder than January 2007, which was the warmest month on record. But it’s just silly to leap to conclusions about climate trends because of one month’s weather.
James Hansen explains further:
The maps are used to show that, even averaged over a month, local weather anomalies
(dynamical fluctuations, more-or-less independent of forced long-term climate change) are much larger
than the global mean temperature change of recent decades.1 Weather fluctuations or Ã¢noiseÃ¢ have a
noticeable effect even on monthly-mean global-mean temperature, especially in Northern Hemisphere
winter. Weather has little effect on global-mean temperature averaged over several months or more. The
primary cause of variations on time scales from a few months to a few years is ocean dynamics,
especially the Southern Oscillation (El Nino Ã¢ La Nina cycle), although an occasional large volcano can
have a cooling effect that lasts a few years. The 10-11 year cycle of solar irradiance has a just barely
detectable effect on global temperature, no more than about 0.1Ã‚Â°C, much less noticeable than El Nino/La
The past year (2007) witnessed a transition from a weak El Nino to a strong La Nina (the latter is
perhaps beginning to moderate already, as the ocean waters near Peru are beginning to warm). January
2007 was the warmest January in the period of instrumental data in the GISS analysis, while, as shown in
Figure 1, October 2007 was # 5 warmest, November 2007 was #8 warmest, December 2007 was #8
warmest, and January 2008 was #40 warmest. Undoubtedly, the cooling trend through the year was due
to the strengthening La Nina, and the unusual coolness in January was aided by a winter weather
The monthly fluctuations of global or near-global temperature, as well as the trend over recent
decades can be seen in Figure 2 for the GISS surface temperature analysis as well as the lower
tropospheric data of UAH (University of Alabama at Huntsville)2 and RSS (Remote Sensing Systems).
The reason to show these is to expose the recent nonsense that has appeared in the blogosphere, to the
effect that recent cooling has wiped out global warming of the past century, and the Earth may be headed
into an ice age. On the contrary, these misleaders have foolishly (or devilishly) fixated on a natural
fluctuation that will soon disappear.
Of course, Drudge, Instapundit and co will ignore it when temperature sreturn to the trend and trumpet the next temporary decline.