Southwest Atlantic Breakout Group Chair: Billy Moore Rapporteur: Tina van de Flierdt Participants: Steven Goldstein Gideon Henderson Felipe Niencheski Peter Statham Jana Friedrich

Three Proposed Sections

Cruise 1: Along the South American Shelf Main goal: capture and understand productivity on one of the largest shelf regions outside the Arctic Ocean (strong seasonality – Oct/Nov = peak signal – do two cruises)  start in Rio, go to Comodoro Rivadavia (probably join up with Drake cruise?)  potential sources of Fe (micronutrients): dust, rivers, submarine groundwater discharge, upwelling  recommendation: set up a dust/air collection station on the Falkland Islands

Chl-a Night light Dust model Chl-a

Cruise 2: Zonal Section Main goal: capture all the main Atlantic water masses along a zonal section  start from Buenos Aires, go into the deep Argentine basin And then along 40S over to the mid Atlantic ridge  captures a major river outflow, a margin with terrigenous input, goes into a ridge with carbonate sedimentation  for proxy calibration cores should be taken on the transect Across the shelf and close to the ridge (grab samples in the middle of the basin are sufficient) Create a baseline station on the shelf.

Cruise 3: Meridional Section Main goal: capture all the main Atlantic water masses along the meridional flow path  following the center of basins starting in the Brazil Basin, Across the Rio Grande rise going into the Argentine Basin  entrance of Southern Ocean water masses (AAIW, AABW) into the western Atlantic Basin (connects to Drake cruise)  far field effects of dust input, comparison of seawater signal to observations at the margins Create a baseline station in the Argentine basin.

Two possible cruise tracks (approximate!)