AMT21 (D371) aerosol chemical composition (major ions, iodine species and soluble trace metals) from size segregated aerosol samples collected October-November 2011.

The dataset contains the atmospheric concentrations of all measured soluble major ions (in Nanomoles per m³), iodine species and soluble trace metals (in Picomoles per m³). These data were produced from the analysis of size segregated aerosol samples collected in the Atlantic Ocean between the 1^st of October and 9^th of November 2011 during the Atlantic Meridional Transect (AMT) cruise AMT21 (D371). The samples were collected by Chan Yodle of the University of East Anglia, UK, using two Tisch high volume aerosol collectors. Samples from one collector were used for analysis of major ions and iodine speciation, and from the other for soluble trace metals. These data are available under the most recent version of the NERC Open Government Licence.