That’s not a misprint. This is what reader Ed Caryl has discovered in his following essay. I’m as shocked as you Ed.
Temperatures at the Larson Ice Shelf – Rothera Station
By Ed Caryl
This is a follow-up on the “It’s The Claim “Antarctica Is Warming” That Is Disintegrating – And Not Much Else” story.
The closest research station to the often-discussed Larson Ice Shelf on the Antarctic Peninsula is Rothera Station on Adelaide Island. This is on the west side of the peninsula, 200 kilometers from the center of the ice shelf. The Rothera Station does not have a long history, despite the GISS temperature record that goes back to 1946. The history below comes from the British Antarctic Survey web site.
From 1955 to 1960 the UK maintained a survey station on Horseshoe Island on the east side of Marguerite Bay. In 1957 two surveyors John Rothera and Peter Gibbs crossed the frozen sea ice and explored the area now known as Rothera Point.
From 1961 to 1977 UK activity in the area was conducted from Adelaide Island Station located at the southern tip of the island. For many years this proved a good base from which to undertake further survey of the Antarctic Peninsula.
Rothera Station was established in 1975 to replace Adelaide Island Station where the glacier ski-way had deteriorated rendering the operation of ski equipped aircraft hazardous. There was a phased construction programme so that by 1980 the station provided accommodation, electrical power generation, vehicle workshops, scientific offices and a store for travel equipment.
From Rothera’s inception to the 1991–1992 austral summer season, BAS Twin Otter aircraft used a glacier ski-way 300m above the station on the Wormald Ice Piedmont. During that summer a gravel runway and hangar facility was commissioned bringing a more reliable air operation and the possibility of a passenger aircraft link from outside the continent. Up to this time everyone coming to Rothera had to depart from the Falkland Islands by ship.”
According to the above, the station temperature data in the GISS record must have come from at least four different locations. These are not moves down the street; these are moves to quite different locations many tens of kilometers apart on different islands or parts of Adelaide Island. The exposures to wind, the ice, and the open sea must have been quite different at each. At each location, the stations also had a development history. Each grew in size from the establishment date to the day it was abandoned for the next. This can be seen in the temperature records, especially the last three. See Figure 1, below.
Figure 1: Last year’s GISS record for Rothera station broken into segments by location.
Figure 1 is the GISS record that I downloaded last year while researching researching A Wind In Antarctica. To answer Pierre’s question on Hansen fudging the numbers, the current GISS record was downloaded. Imagine my surprise (Figure 2 below).
The records have been changed to remove…the warming trend!
Figure 2, the dark blue is the current GISS record for Rothera Station.
During the last year, each of those Rothera Station locations has been “homogenized”, and the warming trend has now largely disappeared. The ESA needs to review their findings of 2.5° C warming. Perhaps those 49 NASA ex-employees have already made a difference. With each GHCN and GISS update, the warming on the Antarctic Peninsula seems to be disappearing. Now we need to watch for further “corrections”.