A23 repeat hydrography section 2020/21

UPDATE: This expedition has been merged with SR1b repeat hydrography 2020/2021 expedition, due to Covid-19 impacts on field activities. https://data.aad.gov.au/duesouth/expedition/fc50fbb3-57aa-492c-91bb-6484f360ab47/ This is an annual repeat of the northern part of the WOCE A23 section, as part of the NERC-funded ORCHESTRA (Ocean Regulation of Climate by Heat and Carbon Sequestration and Transports) project. This work will involve up to 10 days of CTD work (29 stations), with the CTD unit deployed to within 10 m of the seabed at each station. The section runs between the northern Weddell Sea and South Georgia, at the northern end of the Scotia Sea. Niskin bottles will be closed at various depths on the upcast of each profile, and sampled for salinity and oxygen isotopes. Lowered Acoustic Doppler Current Profiler (LADCP) measurements will be made on each profile. This year's cruise will also include trace-metal clean sampling, including radium isotopes. It is likely that this cruise will be combined with servicing the NERC/NOAA-funded moorings in Orkney Passage in 2021.

https://www.bas.ac.uk/project/a23-repeat-section/ https://www.bas.ac.uk/project/orchestra/