| Popis: |
The present study was conducted in order to identify the predominant synoptic patterns of fire occurrence in the western Alborz Mountains. For this purpose, first the days of fire were obtained from the Department of Natural Resources of Gilan Province and product (MCD14) Modis sensor (2007–2020). The longitude and latitude of the affected regions was added to GIS and the spatial database of the fire was prepared. In order to determine atmospheric synoptic patterns, atmospheric maps were obtained from NCEP / NCAR site on all fire days with a spatial resolution of 2.5 * 2.5 degree. Totally, 240 fires occurred in the study area during this 14-year period. Among the months of the year, July, August and December have the highest incidence of fires with the occurrence frequency of 38, 37 and 24 days, respectively. Based on the fires that occurred, the three predominant synoptic patterns have the highest frequency of fires, which are 1) Saudi-African high-pressure dominant in the hot and cold seasons of the year, with three forms of omega blocking (16.5%), ridge (24.8%) and intrusion (22.2%), in total with a frequency of 63.5%, 2) European Migrant high-pressure system intrusion dominant in the hot period of the year, with a frequency of 21.7% and 3) Sub polar low-pressure which is generally dominant during the cold period of the year and responsible for about 14.8% of the fires in the region. |
