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OAS accession Detail for 0278573
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| accessions_id: | 0278573 | archive |
|---|---|
| Title: | TPC, PIC, POC, TPN, and Th-234 from in-situ pumps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017 (NCEI Accession 0278573) |
| Abstract: | This dataset contains chemical data collected on RRS Discovery during cruise DY077 in the North Atlantic Ocean from 2017-04-19 to 2017-04-26. These data include depth, particulate inorganic Carbon as Calcite, and particulate organic Carbon (POC). The instruments used to collect these data include CO2 Coulometer, Elemental Analyzer, McLane Pump, and Riso Laboratory Anti-coincidence Beta Counters. These data were collected by Dr Margaret L. Estapa of Skidmore College and Dr Kenneth O. Buesseler of Woods Hole Oceanographic Institution as part of the "Collaborative Research: Are all traps created equal? A multi-method assessment of the collection and detection of sinking particles in the ocean (Are Traps Equal)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-06-26. The following is the text of the dataset description provided by BCO-DMO: Dataset Description: This dataset contains TPC, PIC, POC, TPN, and Th-234 from in-situ pumps at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean during RRS Discovery cruise DY077 in April of 2017. Related datasets collected during the same cruise: Water column Th-234 activities: https://www.bco-dmo.org/dataset/765859 Sediment trap fluxes: https://www.bco-dmo.org/dataset/765835 |
| Date received: | 20190626 |
| Start date: | 20170419 |
| End date: | 20170426 |
| Seanames: | North Atlantic Ocean |
| West boundary: | -16.591 |
| East boundary: | -16.495 |
| North boundary: | 48.983 |
| South boundary: | 48.866 |
| Observation types: | chemical |
| Instrument types: | |
| Datatypes: | DEPTH - OBSERVATION, PARTICULATE ORGANIC CARBON |
| Submitter: | |
| Submitting institution: | Biological and Chemical Oceanography Data Management Office |
| Collecting institutions: | Skidmore College, Woods Hole Oceanographic Institution |
| Contributing projects: | |
| Platforms: | DISCOVERY (32V3) |
| Number of observations: | |
| Supplementary information: | Acquisition Description: Samples were collected during two deployment cycles (termed “deployment 1” and “deployment 2”) occupied during the RRS Discovery cruise DY077 to the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) Site in April 2017 (Figure 1). In each of the cycles, we conducted particle flux sampling method intercomparisons between fluxes derived from upper water column deficits of 234Th vs. its parent isotope 238U, two types of neutrally buoyant sediment traps (NBST and PELAGRA), and a surface tethered array of sediment traps (STT). DY077 samples analyzed in US (WHOI and Skidmore College) are archived here; DY077 samples analyzed in the UK (NOC) are archived in the British Oceanographic Data Centre. Two McLane in-situ battery powered pumps were deployed two times for the collection of size fractionated particles. The water passes first through a 51-micron screen followed by a nominal 1-micron quartz filter. Filter diameters are both 142 mm and a baffled opening developed for the GEOTRACES program keeps particles from washing off the top screen during retrieval of the pumps as they ascend on the wire. The pumps were programmed with a 1-hour delay time before turning on at depths of 200 and 350 m. After a pumping time of 2 hours, the pumps shut off and were retrieved. After retrieval, volumes were noted (measured by dual flow meters), any water that remained in the pump was drained through the filters, and the screen was rinsed with prefiltered seawater onto a 1-µm pore size silver filter (25-mm diameter). The Ag filter and a 25-mm subsample from the QMA were dried at 45°C, mounted, and immediately counted for low-level β emission onboard the ship. At WHOI, a subset of samples was re-counted approximately one month later on shore. Final background counts to measure non-234Th related β emissions were conducted approximately six months later. At this point, filters were unmounted, re-dried, and gravimetrically subdivided into four sections. One half of the filter was analyzed for total carbon and nitrogen after high-temperature combustion on a Thermo Electron FlashEA 1112 C/N analyzer. Coulometric analysis for PIC after sample acidification was performed on a quarter of the filter (Johnson et al, 1985; Honjo et al, 2000). The remainder of the filter was archived. Porcupine Abyssal Plain Sustained Observatory (PAP-SO) site in the Northeast Atlantic Ocean (49°N, 16.5°W). |
| Availability date: | |
| Metadata version: | 1 |
| Keydate: | 2023-05-21 04:58:33+00 |
| Editdate: | 2023-05-21 04:59:09+00 |