Water samples were collected as part of a 32-day cruise in the Eastern Tropical South Pacific, aiming to study nitrification in this oxygen minimum region of the ocean. In the Event Log for RR2311, transect stations are designated "T" and process stations are designated "PS". Nutrients were collected on the first cast upon arrival at a process station, and in one case on the last day, of a 2-5 day station occupation. Ammonium concentrations were initially planned to be measured in high-resolu...
Show moreWater Sample Collection
Water samples for both NO2 and NH4 analyses were collected using a 24 x 10-liter Niskin bottle rosette sampler equipped with a conductivity, temperature, and pressure instrument package (SBE9, Sea-Bird Electronics, Bellevue, Washington, U.S.A.). The sampler was also equipped with sensors for dissolved oxygen (SBE43, Sea-Bird) and chlorophyll fluorescence (FluoroSeatechWetlabsFLF Sensor). NH4 and NO2 were measured on board immediately after sample collection.
NO2 Analysis
Nitrite concentration was measured manually colorimetrically using standard methods (Hansen and Koroleff, 1999).
NH4 Analysis
Duplicate samples for ammonium concentration were measured immediately upon retrieval and were not filtered prior to analysis. Ammonium concentration was measured manually fluorometrically using standard methods (Holmes et al. 1999).
Ward, B. B. (2024) Ammonium (NH4) and Nitrite (NO2) concentrations from R/V Roger Revelle cruise RR2311 in the Eastern Tropical South Pacific from November to December 2023. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-07-31 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.931516.1 [access date]
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