Blocking of atmospheric systems may lead to slowing down and even stopping the movement of western wind waves. This condition prolongs the warm days in catchment areas in front of the wave and induces continuation of cold and frost days in catchment areas behind the wave. The effect of cold and frost on the crops, especially in spring, is undeniable. Therefore, analyzing the blocking systems, named as omega, is important in Iran’s spring frost duration in southern middle latitudes. The daily minimum temperature data of 69 meteorological stations were collected from the Iranian Meteorological Organization from March 20, 1968, to June 21, 2014, in order to determine the effects of omega blocking systems on duration of the spring frost waves in Iran (equivalent to spring season in the Iranian calendar). By adjusting the tables of daily temperature distribution and plotting the frequency variation diagrams, 114 synoptic waves lasting 3–25 days were identified. Four durable waves (> 12 days) and ten low-durability waves (< 12 days) were identified by dividing the 114 waves into two groups (47 durable waves and 67 low-durability waves) and designing the atmospheric circulation pattern for the middle eastern region based on the air maps of 500 hPa. The results showed that blocking patterns usually occur in the areas of central Europe to the Black Sea basin and cause advective cold air from Scandinavian and central Russia basins to Iran, thereby resulting in durable frosts during spring.
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Jafari Hombari, F., Barati, G. & Moradi, M. Relations Between Durability of Spring Frosts and North Advection on Omega Blocking Over Iran. Pure Appl. Geophys. 178, 671–687 (2021). https://doi.org/10.1007/s00024-020-02652-4
- Durable frosts
- Spring season
- North advection
- Omega blocking