Friday, January 20, 2012

Extreme Weather 2011: Warmest La Nina Year on Record, Around 10th Warmest Overall by Jason Samenow

NOAA global temperature anomalies since 1950, colored coded according to whether La Nina. El Nino or neutral conditions prevailed (NOAA)
Cooler than average waters in the equatorial Pacific, symptomatic of a moderately strong La Nina pattern, stopped 2011 from besting 2010’s El Nino-fueled near-record global warmth. But of the La Nina years on record, 2011 ranked as the warmest according to data from NOAA and NASA.

Considering all years in records dating back to 1880, 2011 was about the 10th warmest year the two agencies reported today.

Both agencies calculated 2011’s global average temperature to be 0.92 F above average. This placed 2011 as 9th warmest overall in NASA’s record compared to a tie for 11th warmest in NOAA’s.
The unusually warm years keep mounting. NOAA said all 11 years of the 21st century rank among the 13 warmest. And NASA noted 9 of the top 10 warmest years in its record have occurred since 2000, the lone exception being 1998 (tied with 2010 as the warmest year).

Global average surface temperatures compared to averaged since 1880 (in degrees C) (NASA)
The string of warm years in the last decade is linked to rapidly increasing concentrations of greenhouse gases NASA said.

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