TY - JOUR JF - Geographical-Researches JO - GeoRes VL - 29 IS - 4 PY - 2015 Y1 - 2015/3/01 TI - Identification of the spatial-temporal anomalies sea level pressure TT - مکان یابی پیچانه های تراز 500 هکتوپاسکال موثر بر اقلیم ایران در نیمه سرد سال N2 - 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. SP - 113 EP - 132 AU - mohammadi, bakhtiar AD - Department Of Climatology, university of kurdistan,Sanandaj,Iran KW - sea level pressure KW - anomaly KW - low pressure KW - high pressure KW - long term mean. UR - http://georesearch.ir/article-1-327-en.html ER -