ALBERT

Description: During Sonne cruise SO283 in the western South Atlantic (19 March - 25 May, 2021) conductivity, temperature, and depth (CTD) measurements were made out using a SeaBird 9+ instrument equipped with dual sensors for temperature, conductivity and oxygen, as well as Wetlabs fluorescence and turbidity sensors. Calibration for conductivity and oxygen was performed at sea using water samples. The CTD data were reprocessed with the corrections applied. After filtering the alignment of the different sensors in the TC-duct was corrected, the standard pressure and temperature correction was applied and loops are removed using the standard Seabird algorithms. Downcast data were separated and averaged over 0.5 dB intervals.

Description: Within the BMBF funded project GENUS (Geochemistry and Ecology of the Namibian Upwelling System) the mole fraction of CO2 (xCO2) was measured in surface waters by using an underway pCO2 system (SUNDANS) duirng seven cruises. SUNDANS was developed by "marine analytics and data" (MARIANDA, Germany, www.marianda.com) according to the recommendations of the 2002 underway pCO2 system workshop in Miami. It was equipped with a shower type equilibrator, an open pre-equilibrator and a non-dispersive dual cell infrared gas analyzer (LI-7000). The LI-7000 was calibrated by using nitrogen gas (zero CO2) and a two additional standard gas for CO2. The standard gases were obtained from the company Deuste Steininger GmbH, Germany and revealed CO2 concentrations of 350 to 480 ppm (Std1) and around 800 ppm (Std2). The CO2 standard gases were calibrated against the standard gases provided by NOAA at the Institute for Baltic Sea Research in Warnemünde, Germany (Ref. No. CA07600 and CC311968) and the Centre for Tropical Marine Research in Bremen, Germany (Ref. No. CB08923 and CA06265). The xCO2 data were recorded each 6 seconds and subsequently averaged minute by minute. Minute by minute data on atmospheric pressure, wind speed, seawater temperature and salinity were measured by underway systems mounted on board the research vessels. xCO2 was converted into pCO2 by using the CO2 sys program. The difference between the equilibrator and the sea water temperature was taken into account as suggested by Dickson et al. (2007, SOP5, page 8). During the RV Metoer cruise M67/2 between May 15 and June 05 2008 the pCO was measured by using PSI CO2-ProTM underwater carbon dioxide sensor designs by Pro-Oceanus Systems In., USA.