Brian Gunter, Narooma, NSW, Australia http://members.westnet.com.au/brigun/halley-temps.html
"Trends are not always trendy"
Has the Antarctic continent become significantly warmer in recent years?
Here is a detailed analysis of the temperature data recorded at the Halley station since 1956.
Halley station, in Antarctica, was operated by the United Kingdom since January 1956. The station is located on an ice shelf near the coast of Antarctica (see map) with coordinates -75.50°N -26.65°E.
The raw data were extracted from the website of the Royal Dutch Meteorological Institute (KNMI).
Graphical plots are presented below of values of mean temperatures for each of the 12 months and also for each year (January-December).
A polynomial trend line was fitted through each of the sets of data.
This study is a more detailed analysis of temperature trends that I have made for 13 long-term stations in Antarctica. http://members.westnet.com.au/brigun/antarctica-temps.html That study showed that mean summer, winter and annual temperatures at 10 of the 13 stations also had essentially zero temperature trends over the past 60-70 years. The three stations located on the more-northerly Antarctic Peninsula had significant increased temperature over that same period.
The temperature at Halley station has varied little over the past 60 years.
Over the warmer months (December-March) the temperature peaked in the 1970-1980 period, with current temperatures about 1°C lower.
During April, May and June there is a well-defined cyclic trend with highs around 1970 being about 2-4°C less in a low around 2000.
During July-November the temperature trend is close to zero.
So, there is no evidence of any significant change in the temperature at Halley station over the past 60 years!
ANNUAL AND MONTHLY TEMPERATURE TRENDS AT HALLEY STATION, ANTARCTICA
This article was written by Brian Gunter of Narooma, NSW. In his previous life Brian was an engineering hydrologist involved over many years in the analysis of rainfall and river flow data for the planning of water resources projects in Australia, Asia and Africa. In recent years he has been one of the Marine Rescue NSW (previously Royal Volunteer Coastal Patrol) volunteer weather observers who operate the Narooma station for the Bureau of Meteorology.
28 May 2015