Ocean circulation along the southern Chile transition region (38°–46°S): Mean, seasonal and interannual variability, with a focus on 2014–2016

•Detailed satellite description of winds and ocean circulation off southern Chile.•Seasonal winds and current reversals; unexpected equatorward flow.•Strong oceanic connections to tropical Pacific ENSO variability.•2015–2016 ENSO conditions favored A. catenella bloom north of Chiloé Island.•The strongest atmospheric blocking in 39 years; plays a role in the bloom.