Coccolithophore community composition and abundance by light microscopy from CTD bottles and surface underway samples during the Atlantic Meridional Transect AMT20 (JC053) cruise in October-November 2010

This dataset contains coccolithophore abundance data from CTD bottles and surface underway samples collected during the JC053 cruise in the Atlantic between Southampton, UK and Punta Arenas, Chile in October-November 2010. Niskin samples were collected during the pre-dawn CTD (second cast of the day) from six light depths (1%, 7%, 14%, 33%, 55%, 97%). Samples were also collected 4 times per day from the non-toxic water supply. Samples for microscopic enumeration of coccolithophores and coccoliths were collected on Millipore HA (nitrocellulose) filters and rinsed with potassium tetraborate buffer, then frozen at 20 °C. Samples were then dried, mounted onto slides using Norland Optical Adhesive and enumerated using by birefringent microscopy (Balch et al. 2011). These data were collected by scientists from the Bigelow Laboratory for Ocean Sciences and contribute to the Atlantic Meridional Transect (AMT) project.