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High Pressure Over Greenland Driving Arctic Air South
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High Pressure Over Greenland Driving Arctic Air South

This image shows the sea level pressure anomaly calculated from NCEP climate reanalysis data from February 25 through March 25, 2013. The area of anomalous high pressure over Greenland illustrates the negative phase of the Arctic Oscillation, by which persistent high pressure blocks Arctic air from moving eastward, causing it to drop down into the middle latitudes and is a contributing factor in keeping temperatures unseasonably cool in Canada and the US.

Referral:Climate reanalysis data from NOAA ESRL/PSD
Terms of Use:Please credit NOAA
Keywords:NCEP, Arctic Oscillation, 2013.03.28 logo
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