Impacts of climatic change and low frequency variability in reference series on daily maximum and minimum temperature in southern South America

  • Vargas W
  • Naumann G
  • 12


    Mendeley users who have this article in their library.
  • 8


    Citations of this article.


Understanding the climate and its variability, in particular with regard
to their socioeconomic impact, requires specific measurements of
precipitation and temperature and their circulations. This becomes more
important in applications to diverse systems. In order to improve
knowledge about temporal changes and trends in temperature, we analyzed
series of maximum and minimum daily surface temperatures at eight
reference stations in southeastern South America during variable
periods, with the longest periods of around 100 years. To study the
evolution of the temperature series and to reduce the number of
parameters, a nonhierarchical cluster analysis was performed. The
algorithm assigns each day to one of four groups: warm, wet, cold and
dry. Low frequency variations were found in these groups and their
association with circulation structure, circulation patterns and
precipitation. We concluded that the set of wet days is one of the main
factors driving secular variations of maximum and minimum temperature
and variations in precipitation. We also inferred that after 1920 till
1930, a low frequency oscillation is observed in the form of linear
trends (increase of warm days and decrease of cold days).

Author-supplied keywords

  • Daily temperatures
  • Low frequency variability
  • Reference series

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Get full text


  • Walter M. Vargas

  • Gustavo Naumann

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free