Gallery of Images

Cover Image shown on http://www.aoos.org Link and here:The PDO (Pacific Decadal Anomaly) pattern is the leading EOF[1] of monthly sea surface temperature anomalies over the North Pacific after the global mean sea surface temperature anomaly is removed.

The global pattern is computed as the regression of monthly sea surface anomalies on the principal component time-series. The units are °C per standard deviation of the PDO index.

Ref:http://www.cgd.ucar.edu/cas/cdeser/Docs/deser.sstvariability.annrevmarsci10.pdf

Data source, HadISST (1880-2010):http://www.metoffice.gov.uk/hadobs/hadisst/data/download.html

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Sea Surface Anomaly - December 2014 indicating warmer waters than average in yellow, and colder than average in blue.
Sea Surface Temperature Anomaly – December 2014 indicating warmer waters than average in yellow and red, and colder than average in blue.

Oceanographers and climatologists identify events like El Nino, and the recent emergence of the Blob using longterm data averages and comparing them to current conditions. The Blob refers to the difference in mean sea surface temperature in north Pacific region for a given month from the multi-year mean for that same month.

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