Concentration and δ15N of amino acids in size-fractionated particles from the eastern tropical North Pacific ODZ

This dataset includes the concentration and δ15N of bulk N and amino acids in size-fractionated particles. Particle samples were collected aboard the R/V Sally Ride (cruise SR2011) from December 23 – 30, 2020 with a McLane large volume pumping system (WTS-LV). These data assess the N sources utilized by different phytoplankton communities inhabiting the two chlorophyll maxima and the transformation of particulate organic matter within the oxygen-deficient zone., Two particle fractions were collected at five stations in the eastern tropical North Pacific region. At each station, seawater was filtered sequentially through a 53 µm Nitex mesh and then a pre-combusted 142-mm-diameter glass fiber filter (GF-75: 0.3 µm retention size; or GF/F: 0.7 µm nominal retention size) with the McLane pump in situ. These filters were promptly frozen upon retrieval.Each 53 µm Nitex mesh was immersed in approximately 100 ml of MilliQ water and subjected to a 5-minute sonication. The solution was filtered onto pre-combusted 47-mm glass fiber filters (GF/F, 0.7 µm pore size), which retain the > 53 µm particle fraction.
The GF-75 and GF/F filters (0.3 or 0.7 – 53 µm fractions) were subsampled, packed in tin capsules, and analyzed for concentration and δ15N of bulk materials by an elemental analyzer isotope-ratio mass spectrometer at the UC Davis Stable Isotope Facility. Bulk δ15N analysis was not performed for the > 53 µm fraction due to the limited amount of co..., , # Concentration and δ15N of amino acids in size-fractionated particles from the eastern tropical North Pacific ODZ

[https://doi.org/10.5061/dryad.prr4xgxxf](https://doi.org/10.5061/dryad.prr4xgxxf)

## Description of the data and file structure

This dataset includes the concentration and δ15N of bulk N and amino acids in size-fractionated particles. Two particle fractions were collected aboard the R/V Sally Ride (cruise SR2011) from December 23 – 30, 2020 at five stations with a McLane large volume pumping system (WTS-LV). These data assess the N sources utilized by different phytoplankton communities inhabiting the two chlorophyll maxima and the transformation of particulate organic matter within the oxygen-deficient zone. Two particle fractions were collected at five stations in the eastern tropical North Pacific region. At each station, seawater was filtered sequentially through a 53 µm Nitex mesh and then a pre-combusted 142-mm-diameter glass fiber filter (GF-75: 0.3 µm retention ...