Surface pCO2, bottle-corrected Chl a, and shipboard wind speed from cruises conducted during 2010, 2011, and 2012 off the Northeast coast of Brazil in the Amazon River Plume as part of the ANACONDAS project (NCEI Accession 0278007)

This dataset contains biological, chemical, meteorological, and physical data collected on R/V Atlantis, R/V Knorr, and R/V Melville during cruises AT21-04, KN197-08, and MV1110 in the Caribbean Sea, North Atlantic Ocean, and South Atlantic Ocean from 2010-06-06 to 2012-07-29. These data include Partial pressure of CO2, chlorophyll a, salinity calculated from CTD primary sensors, water temperature, and wind_speed. The instruments used to collect these data include Fluorometer, Gas Analyzer, Meteorological Station, Niskin bottle, and Thermosalinograph. These data were collected by Patricia L. Yager of University of Georgia as part of the "Amazon iNfluence on the Atlantic: CarbOn export from Nitrogen fixation by DiAtom Symbioses (ANACONDAS)" project and "Emerging Topics in Biogeochemical Cycles (ETBC)", "Integrated Marine Biogeochemistry and Ecosystem Research -US (IMBER-US)", "Marine Microbiology Initiative (MMI)", and "Ocean Carbon and Biogeochemistry (OCB)" programs. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2021-04-21.

The following is the text of the dataset description provided by BCO-DMO:

AN10-12 Surface pCO2 and Chl a

Dataset Description:
Acquisition Description:
Methodology Summary
SST and SSS were continuously monitored using an in-line Seabird thermosalinograph. Chlorophyll a fluorescence (FLR) was recorded by a fluorometer mounted 5-7 m below sea surface, which was then converted to chlorophyll a concentration (Chla) using a linear regression of FLR against discrete Chla measurements of surface water samples collected with Niskin bottles during each cruise. True wind speed was measured shipboard by meteorological instruments on each vessel. Wind speed at 10 m above sea surface (U10) was corrected from instrument heights based on Thomas et al. (2005). Partial pressure of carbon dioxide at sea surface (pCO2_sw) was determined with a showerhead-type pCO2 analyzer (Bates et al., 1998; Sweeney et al., 2000; Takahashi et al., 1997) and an infrared CO2 detector at in-situ SST (Cooley et al., 2007).

pCO2 sampling procedures
The volumetric concentration of CO₂ ( x CO₂ (sw) , in ppm) was automatically calibrated at least hourly against six CO₂-N₂ gas mixtures containing 0–510 ppm CO 2 (Certified by the National Oceanographic and Atmospheric Administration Climate Monitoring and Diagnostics Laboratory, NOAA CMDL, Boulder, Colorado, USA). Sea surface p CO₂ was converted from x CO₂ (sw) and corrected to in-situ SST (see Weiss & Price, 1980, and Takahashi et al., 1993, for details). The gas stream between the equilibrator and the detector was dried, but this filter sometimes failed, leaving gaps in the data along the cruise track where water vapor overwhelmed infrared detection of CO₂. These system failures were apparent and easily removed manually. Instrument accuracy was ±1 µ atm and the response (e-folding; Cooley et al., 2007) time was 6, 2, 10 mins for cruises during June 2010, July 2012, and September 2011, respectively.

More details on methodology can be found in Mu et al. (2021).