Just a little something he threw together
Guest Post by David Middleton
First the breath-taking headlines…
- Scientists Report Faster Warming in Antarctica, New York Times (WUWT commentary)
- West Antarctic Ice Sheet warming twice earlier estimate, BBC
- West Antarctica warming much faster than previously believed, study finds, NBC
- Western Antarctica is warming three times faster than the rest of the world, Grist
Oh noes out the wazzoo!!!
What could possibly have caused such an out-pouring of Mr. Bill impersonations?
Apparently this did…
Central West Antarctica among the most rapidly warming regions on Earth
David H. Bromwich,1, 5 Julien P. Nicolas,5, 1 Andrew J. Monaghan,2 Matthew A. Lazzara,3 Linda M. Keller,4 George A. Weidner4 & Aaron B. Wilson1
Nature Geoscience Year published: (2012) doi:10.1038/ngeo1671
Received02 May 2012 Accepted15 November 2012 Published online23 December 2012
There is clear evidence that the West Antarctic Ice Sheet is contributing to sea-level rise. In contrast, West Antarctic temperature changes in recent decades remain uncertain. West Antarctica has probably warmed since the 1950s, but there is disagreement regarding the magnitude, seasonality and spatial extent of this warming. This is primarily because long-term near-surface temperature observations are restricted to Byrd Station in central West Antarctica, a data set with substantial gaps. Here, we present a complete temperature record for Byrd Station, in which observations have been corrected, and gaps have been filled using global reanalysis data and spatial interpolation. The record reveals a linear increase in annual temperature between 1958 and 2010 by 2.4±1.2 °C, establishing central West Antarctica as one of the fastest-warming regions globally.
The manufactured “record reveals a linear increase in annual temperature between 1958 and 2010 by 2.4±1.2 °C.” That’s a 50% margin of error on the reconstruction that supposedly corrected the recording errors.
I haven’t purchased access to the paper (nor do I intend to); however, the freely available supplementary information includes a graph of their reconstructed temperature record for Byrd Station. It looks very similar to the NASA-GISS graph that doesn’t show any significant recent warming trend.
The NASA-GISS data (GHCN & SCAR) for Byrd Station are in two segments: 1957-1975 and 1980-2012. The 1957-1975 series depicts a moderately significant (R² = 0.19) warming trend of about 1.0 °C per decade. The post-1980 series depicts a statistically insignificant (R² = 0.01) trend of 0.3 °C per decade.
Bromwich et al., 2012 get their 2.4 °C of warming from 1958-2010 (0.4 °C per decade) by stitching together the fragmented data sets. If I just combine the two NASA-GISS series, I get a trend of about 0.4 °C per decade…
But, almost all of that warming took place before 1988. And Byrd Station has seen no warming (actually a slight cooling) since 1991.
Furthermore, the corrected temperature record of Bromwich et al., 2012 appears to actually depict more cooling since 1991 than the uncorrected data…