Particulate bulk and amino acid d15N values from EXPORTS cruises on RRS Discovery (DY131) and RRS James Cook (JC214) in May 2021

This dataset presents bulk and compound-specific nitrogen stable isotope ratios of amino acids in size-fractionated and sinking particles from the Northeast Atlantic during the spring bloom decline as part of the second EXPORTS campaign. Size-fractionated particles were collected via in situ filtration and sinking particles were collected via sediment traps in May 2021. Size-fractionated particles were collected from 20 meters (m) to 500 m at various depths, depending on particle type. At 30 and 340 m, five size fractions were collected for both bulk and amino acids isotopic analysis: 0.3-1 micrometers (μm), 1-6 μm, 6-51 μm, 51-335 μm, and >335 μm. At 20, 50, 75 or 95, 125 or 145, 175 or 195, 330, and 500 m, two size fractions were collected for amino acid isotopic analysis: 0.8-51 μm particles and >51 μm particles. Particle data were used to determine major processes altering particulate organic matter. The collection of these data was supported by NSF.