Ultrapure Water Soluble Aerosol Concentrations US GEOTRACES Arctic PI: Clifton Buck (Skidaway Institute of Oceanography) Co-PIs: William Landing (Florida State University) & Yuan Gao (Rutgers) Version history: 04 June 2020 - replaced with GEOTRACES-DOoR format (revised nomenclature); 27 February 2018 - original.