Phytoplankton size-fractionated chlorophyll a at Chatham Rise, east of New Zealand, measured during the SalpPOOP (TAN1810) campaign onboard the RV Tangaroa

Sampling for Salp Particle expOrt and Ocean Production (SalpPOOP) was carried out onboard the RV Tangaroa from October 23rd to November 21st, 2018, in the vicinity of the Chatham Rise, east of New Zealand. The purposes of this oceanographic voyage were to investigate the effect of salp blooms on carbon export flux and the relationship to the lower the food-web and environmentooms on carbon export flux and the relationship to the lower the food-web and environment. We used a Lagrangian experimental array to conduct in situ incubations (e.g., 14C primary production rate measurements, grazing dilution experiments), which consisted of surface floats for flotation and an iridium-enabled float for satellite tracking of the array. A plastic-coated wire was connected the float to a 3x1 m holey sock drogue and centered at a depth of 15 m to ensure that the Lagrangian array tracked the mixed layer water. Mesh bags were placed to span the depth of the euphotic zone, adjusted for each experimental cycle based on the fluorescence profile, and contained experimental rate measurement bottles at six depths within the euphotic zone deployed for 24 hours. A surface-tethered, free-drifting particle interceptor trap (PIT) array was deployed in proximity to the in-situ array, equipped with a surface Iridium beacon and light flasher, surface and subsurface floats, 10 m bungies (to reduce wave action effects) and holey-sock drogues at 15 m to ensure the trap arrays followed the same water parcel as the in-situ drifting arrays. A total of five water parcels (experimental cycles) were sampled, for periods ranging from 3-7.5 days. Salp cycles included: two in Subantartic waters, Salp SA-Sc and Salp SA (Cycle 1 and 2), and one in Subtropical waters, Salp ST (Cycle 4). Two non-salp cycles included: one in Subantartic waters: Non-salp SA (Cycle 5), and one in Subtropical waters: Non-salp ST (Cycle 3). Here, the phytoplankton size-fractionated chlorophyll a is presented. Water from discrete depths spanning the euphotic zone was sampled from the CTD for chlorophyll a (chl a), total and size-fractionated (>20 µm, 2-20 µm and 0.2-2 µm) using fluorometric methods. Samples for total chl a analysis were filtered on‐board on 25mm Whatman GF/F filters using low vacuum (20 μm), 250 ml of seawater were sequentially filtered through a 20 μm polycarbonate filter first (by gravity), and then sequentially through 2‐ and 0.2‐μm polycarbonate filters under low pressure vacuum. Filters were folded and stored in 1.5 ml cryovials, flash frozen in liquid nitrogen, and stored at −80 °C. Analyses was done following 90% acetone extraction and standard fluorometric methods with a Turner Design fluorometer after Strickland and Parsons (1972).

Empty cells = ndThis study was funded by the Ministry for Business, Innovation and Employment (MBIE) of New Zealand, NIWA core programmes Coast and Oceans Food Webs (COES- COES1901) and Ocean Flows (COOF-COOF1902), the Royal Society of New Zealand Marsden Fast-track award to Moira Décima, and NSF award #OCE-1756610 to Michael R. Stukel and Karen E. Selph.

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Metadata Access
Creator Décima, Moira; Gutiérrez-Rodríguez, Andrés; Selph, Karen E; Safi, Karl; Kelly, Thomas B; Latasa, Mikel; Gorbunov, Maxim Y
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2021
Rights Data access is restricted (moratorium, sensitive data, license constraints)
OpenAccess false
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 1333 data points
Discipline Earth System Research
Spatial Coverage (-179.811W, -45.556S, 174.095E, -42.655N); Chatham Rise, east of New Zealand
Temporal Coverage Begin 2018-10-25T11:53:00Z
Temporal Coverage End 2018-11-19T00:44:00Z