Geographical Research

Identification of spatial-temporal anomalies sea level pressure in part of northern hemisphere was the main aim in this research. For this purpose six hourly data used from the to eastern longitude and to northern latitude. In this location، there are 825 pixels to geographical degree. Therefore، database extent created. In this matrix، 825 are number of the pixels at that location and 90520 is number of six hourly scout of the sea level pressure during 62 years (1948-2009). Using these data، monthly anomalies sea level pressure obtained for every pixel. Frequency lesser and higher then long term mean calculated such as the negative and positive anomaly to sequence. For every month anomaly map of the sea level pressure have been drawled. The results showed that frequency of negative anomalies of the sea level pressure، almost during from November to April in most parts of Iran have been more then 50 percent and also during May to October lesser from 50 percent.