This cruise is part of the decadal re-occupation of select NOAA hydrographic transects to determine natural and anthropogenic changes in chemical and physical properties in the ocean under auspices of the international Global Ocean Ship-based hydrographic investigations program GOSHIP. The focus of this particular cruise is to determine the changes in anthropogenic CO2, distributions and fluxes in the South Atlantic since the last occupation in 2005 as part of the CLIVAR/CO2 program. Decadal variations of CO2 tracer, oxygen, and temperature distributions are strongly influenced by climate change and natural processes. The repeat hydrography cruises are the only means to obtain climate quality data to study changes and impacts in the ocean. This research is co-sponsored by the USA agencies NOAA and NSF. During the cruise an ancillary project will also be conducted to investigate oceanic lightning, which is poorly understood. An experimental low-frequency receiver will be used to detect and record lightning data in-situ. This will allow comparison of shipborne measurements of oceanic lightning with measurements from land-based lightning networks and the space-based Lightning Imaging Sensor (LIS) on the National Aeronautical and Space Administration (NASA) Tropical Rainfall Measuring Mission. The LIS is a precursor to the satellite-borne Geostationary Lightning Mapper, planned to fly on NOAA's GOES-R geostationary satellite series.
Richard Hendrik Wanninkhof (NOAA Atlantic Oceanographic and Meteorological Laboratory)