Mid Latitude Atmospheric circulation and its relation with Temperature Variations in Iran

Abstract

One of the clearest manifestations of climate change is greater near-surface warming of the high latitudes than the low or middle latitudes of the Northern Hemisphere. This so-called Arctic amplification (AA) is evident in observations over recent decades. This disproportionate temperature rise is expected to influence the large-scale circulation, perhaps with far-reaching effects. The North/South temperature gradient is an important driver of the polar jet stream, thus as rapid Arctic warming continues, one anticipated effect is a slowing of upper-level zonal winds. It has been hypothesized that these weakened winds would cause the path of the jet stream to become more meandering, leading to slower Eastward progression of ridges and troughs, which increases the likelihood of persistent weather patterns and consequently extreme events.In the present research, we have attempted to detect the impacts of change atmospheric circulations under this hypothesis on variations of temperature in Iran and develops a method to assess the estimation of these changes in the studied area.

Keywords

• arctic amplification
• westerlies
• aggregate sinuosity
• temperature
• iran