Second Scientific Expedition

Second Scientific Expedition

Investigator ventured into the sub-Antarctic Southern Ocean in January and March as part of two scientific voyages with a range of scientists onboard from various institutions. An added and unexpected bonus on the first voyage was the witnessing of a volcanic eruption of Mawson Peak on Big Ben, Heard Island as Investigator approached the Heard and McDonald islands area.

Professor Tom Trull, Chief Scientist told ASPects that on the second voyage, the principal objectives were divided into three Projects:

SOTS

(Southern Ocean (SO) Time Series) which studies the atmosphere – ocean exchange of heat and carbon monoxide, using three sets of automated moorings.

CAPRICORN

Clouds, Aerosols, Precipitation, Radiation, and Atmospheric Composition over the Southern Ocean (SO). The Capricorn project aims to advance the scientist’s knowledge of the SO cloud systems,

aerosol properties, surface energy budget upper ocean biological aerosol production, and atmospheric composition, in order to improve the characterization of their physical properties from satellite platforms and global models.

EDDY

Linking eddy physics and biogeochemistry in the Antarctic Circumpolar Current south of Tasmania.

To understand how eddy circulation impacts elemental cycling and how this scales up to the eddy field of the Southern Ocean. The voyage commenced from the Marine National Facility base in Hobart on 14 March, and returned on 16 April. At the conclusion of the expedition Professor Trull stated that the scientific c work undertaken during the voyage had been successful. He said we were assisted with the availability of the latest technology and equipment installed on Investigator, together with an expert and dedicated team of scientists onboard, and a well-trained and professional crew.

Investigator left Hobart for her third scientific c expedition on 26 April bound for the southern ice edge along longitude 170°W, and will travel as far south as possible, limited by the ice capability of the vessel. Investigator will then proceed north along 170°W to the equator while scientists conduct Current Temperature Density (CTD) casts approximately every four hours. She will also make a short visit to Wellington to refuel, take stores and change some scientific crew.