Study finds Antarctic peninsula "regionally stacked temperature record for the last three decades has shifted from a warming trend of 0.32 °C/decade during 1979–1997 to a cooling trend of − 0.47 °C/decade during 1999–2014."
Climate alarmists generally contend that current temperatures are both unnatural and unprecedented, as a result of global warming caused by anthropogenic CO2 emissions; and they claim that this “unnaturalness” is most strongly expressed throughout the world’s polar regions. In this regard, they often point to warming on the Antarctic Peninsula (typically the Faraday/Vernadsky station) as the proverbial canary in the coal mine, where over the past several decades it has experienced warming rates that are among the highest reported anywhere on Earth. However, in recent years two studies have challenged this assessment. Carrasco (2013) reported finding a decrease in the warming rate from stations on the western side of the Antarctic Peninsula between 2001 and 2010, as well as a slight cooling trend for King George Island (in the South Shetland Islands just off the peninsula).
Esperanza is at the northern tip of the Antarctic peninsula, at a latitude of 63.4S, just about as far outside the Antarctic Circle as you could get.
The implication now is that “balmy” temperatures of 63F are unheard of Antarctica, which is clearly nonsense. And as we can see, monthly average temperatures in March 2015 were not in the least unusual. Indeed, the hottest March was in 1965.
So, what’s happening in Antarctica? According to Paul Homewood, the simple answer was weather. Changing wind patterns, Homewood wrote on his site, caused by the Southern Annular Mode flipping negative allowed winds to penetrate from the north. That elevated temperatures while “pushing sea ice towards the coast.” Another issue was the accuracy of the satellites, also called the margin of error. NSIDC admits on its site that calculating sea ice loss, especially in summer, can be difficult with large discrepancies. That’s because satellites have trouble distinguishing between melt ponds and ice, leading to a margin of error of plus or minus 15 percent. Accuracy is highest when the ice pack is thick and concentrated. It decreased when thin ice increased.