Surface Ocean Trace Metal Distributions across Basin-Scale Transects: Patterns from GEOTRACES GP15 and a Comparison with GP16 and GA03

Robert Freiberger1, Cristina Tusei1, Jacob I Begorre1, Jessica N Fitzsimmons2 and Claire P. Till1, (1)Humboldt State University, Chemistry, Arcata, CA, United States, (2)Texas A&M University, Oceanography, College Station, TX, United States
Surface ocean trace metal concentrations are governed by a myriad of factors including input from the air-sea interface, biological uptake, and particle scavenging. The GEOTRACES GP15 Pacific Meridional Transect traversed a wide range of surface ocean conditions, including (briefly) several marine biomes with variable nutrient demands, the coastal margin to the highly oligotrophic gyre, and a range of dust and biological particle regimes. In this work, these ocean conditions are compared with the surface dissolved trace metal concentrations from this cruise to better elucidate the biogeochemical cycling. Furthermore, the dissolved trace metal distribution data from previous GEOTRACES cruises in the North Atlantic (GA03) and South Pacific (GP16) are compared with GP15, highlighting broad patterns in surface trace metal distribution.