File(s) | Type | Description | Action |
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922922_v1_particulate_th.csv (10.56 KB) | Comma Separated Values (.csv) | Primary data file for dataset ID 922922, version 1 | Add to Cart Download |
The abyssal plains of the oceans cover roughly half of the earth's surface, host enormous reservoirs of biodiversity and mineral resources, and play important roles in nutrient regeneration and carbon sequestration. The most important process controlling the structure and function of these ecosystems is the quantity and quality of food (mostly sinking organic particles) that reaches the deep-sea floor. The goals of this research were to evaluate the relative importance of small and large particl...
Show moreParticulate sample collection methods are similar to those described by Roca-Marti et al. (2021). Briefly, 142 mm diameter, 0.3 micron (µm) pore-size GF75 filters, 1 µm pore-size QMA filters, and 53 µm pore-size Nitex filters were cleaned according to trace metal clean protocols. Filters were mounted sequentially by size on metal-free mini-MLVFS filter holders attached to the in situ pumps and deployed at depths between 10 and 4000 depending on the cruise. Between ~500-2000 L of water were filtered per deployment at a rate of 8 L/minute. High flow rates of ~20 L/minute were used to filter large volumes of water (~5000-7000 L) required for capturing sufficient > 53 µm particles for isotopic and compound specific analyses.
Small particles collected using QMA and GF75 filters were subsampled using a ~22 mm Delrin punch for particulate 234Th, total carbon (C), and bulk C and nitrogen (N) isotopic analyses under trace metal clean conditions. Large particle (> 53 µm) samples for 234Th, C, and bulk N were rinsed onto 25 mm QMA filters using 0.2 µm filtered seawater and visible swimmers were removed. Samples were then dried, mounted onto RISO discs, and stored at 4˚C prior to and immediately following counting. All samples were counted on a low level RISO beta counter using a helium/1%butane gas mixture.
Drazen, J. C., Benitez-Nelson, C. R. (2024) Particulate Th data from samples collected on 5 cruises at Station ALOHA off Hawaii and Station M off California from 2019 to 2020. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-03-20 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.922922.1 [access date]
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