Watts Up With That?
Wednesday, April 15, 2009
While I have reservations about the GISS dataset due to the many adjustments it endures, the GISS global temperature anomaly data for March 2009 has been published.
The March 2009 global anomaly is 0.47 °C, making it the coldest March since the year 2000.
As Luboš Motl points out:
That is also colder than March 1990 and 1998, That puts March 2009 out of the “top ten”. Also, the March 2009 global mean temperature differed by 0.03 °C only from the March 1981 figure – from a month when the ENSO/ONI index was pretty much equal to the current value. This cherry-picked monthly comparison would suggest that there may have been 0.03 °C of warming in 30 years.
Another blogger, Lucia plotted long term GISS trends and got some interesting results.
Here they are:
(ARTICLE CONTINUES BELOW)
Well…. I’ve haven’t claimed global warming stopped or stalled in 2001. (In any case I’m not sure precisely what those terms are supposed to mean. If all they mean is temperature trends are down since 2001…. well, they are! If they mean that GHG’s don’t tend to cause warming and warming won’t resume… Well, the data don’t mean that.)
While GISS went up a tiny bit, from 0.41 in February 09 to 0.47 °C in March 09, you could figure that .06 °C to be essentially unchanged month to month and part of the “noise”. The lack of any real increase in trends since 2001 is the most interesting part of the GISS story.
This article was posted: Wednesday, April 15, 2009 at 3:21 am