http://bolin.su.se/data/chafik-2019-gyre-1 Léon Chafik Bolin Centre Database 2019 Datafile Marine Circulation Gyre index Ocean circulation North Atlantic Earth science > Oceans > Ocean circulation Léon Chafik 2019-06-18T19:39:15+00:00 English 1 None, but please cite Hátún and Chafik (2018) Monthly gyre index from January 1993 until December 2016. The data is provided in one comma separated value (csv) file with the following entries on each row: year, month, index value. The index is normalized, i.e. it has a zero mean and unit standard deviation. Positive (negative) gyre index reflects stronger (weaker) than average surface circulation of the North Atlantic subpolar gyre.