The Analysis of Spatio-Temporal Variations of Temperature in the North –West of Iran

Abstract

In this paper in order to recognize the spatio-temporal variations of temperature in the north-west of Iran,19 synoptic stations which had had the more complete time series, have been used. First temperature spatial variations on the basis of central and dispersion parameters were studied. Then by using the interpolation Thin Plate Smoothing Spline (TPSS) method which has had the least Mean Absolute Error (MAE), the iso-therm curves and Coefficient Variation (C.V) were drawn.Then according to the parametric and nonparametric methods the temporal temperature variations were studied. The results of this survey show that the north-west temperature has had the converse significant relation with the elevation. The results showed that the annual mean temperature series have increased apparently over most of the north-west.We have recognized that this is clear and significant indication for the existence of strong increasing temperature from west - east longitude. The results also showed that the annual mean temperature series have decreased apparently over west of the north - west.

Keywords

• temperature
• climate change
• nonparametric statistics
• man-kendal test
• north-west of iran