Analysis of the spatial structure of waves continued cooling space-time changes in recent decades

As an indicator of the intensity of the heat temperature air is a basic element of understanding and view of the solar energy received by the Earth's irregular changes included extensive. Ice cold waves and one of the most important phenomena in Climatology is the study of daily temperature changes over time arises. The aim of this study was to analyze the spatial variability of core cooling in the North West of Iran during the various waves. For this purpose minimum temperature data and climatology station 42 were the highest during the period of the country's Meteorological Agency. The day was considered as a cold wave that has a standard score equal to or less than 2 / -1. In accordance with this definition programming using MATLAB software environment days with cold wave extraction and analysis of spatial autocorrelation Moran was studied and analyzed. The results of this study indicate that although core cooling waves of distributed heterogeneous spatial distribution has been but the major focus of this core cluster pattern in the eastern part of the study area is high. The results of the analysis showed that in the course of recent decades addition to the marked decline in the range of core cooling, The intensity of cooling cores for different durations, especially the continuation of five and six days has been reduced.