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Abstract

Atmospheric blocking is a large-scale pattern of nearly stationary atmospheric pressure and geopotential height. Blocking patterns play a major role in the transportation of moisture and heat from the mid-latitudes to the high latitudes. Low-frequency atmospheric teleconnections, including the Arctic Oscillation (AO) and the North Atlantic Oscillation (NAO), influence blocking patterns. Two methods of blocking identification are utilized to develop a climatology of blocking across the Arctic for 1980–2017. Exploratory data and statistical analyses quantify the relationship between teleconnection phases and blocking frequency during the four seasons on annual, seasonal and monthly time scales. Results show distinct differences in blocking frequency based on the method, but no significant trends in blocking were identified by season or quadrant, contrary to previous studies. Similar to previous studies, increased blocking frequency is related to the negative phases of both the AO and NAO.

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