Faculty of Natural Resources;
University of Tehran;
77871-31587;
Karaj;
Iran;
Department of Technology and Society;
Lund University;
SE-22100;
Lund;
Sweden;
Centre for Environmental and Climate Science;
Lund University;
SE-22362;
Lund;
Sweden;
linear trends; nonlinear trends; time series analysis; air temperature; Polytrend; Iran;