Aerial cetacean survey Southern Ocean 2019

This dataset was collected during PS119 during a dedicated distance sampling survey for cetaceans in the Southern Ocean conducted on board of Polarstern during the austral summer 2019 (25-04-2019 - 21-05-2019). Effort related sighting data were collected en-route using helicopter flights planned ad-hoc based on the current position of R/V Polarstern to infer density distribution of southern hemisphere fin whales. Surveys were conducted whenever wheather and ship operations permitted. One observer was seated on the port side of the helicopter and the data recorder was seated in the copilot seat on the port side. Positions were logged every 4 seconds using a dedicated survey software and all cetacean sightings were recorded upon detection. All changes that may impact detection probability of cetaceans were noted as described by the observers. Surveys were conducted at an altitude of 600ft at 100 kts and seastates less than 3 Bft