Microplastics concentration along a latitudinal gradient in the Atlantic Ocean collected aboard RV Polarstern from 2015-11-01 to 2015-11-28 (NCEI Accession 0270542)
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title: Microplastics concentration along a latitudinal gradient in the Atlantic Ocean collected aboard RV Polarstern from 2015-11-01 to 2015-11-28 (NCEI Accession 0270542)
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abstract: This study was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/m^3) concentration along a latitudinal gradient in the Atlantic Ocean. Microplastics data was collected from 2015-11-01 to 2015-11-28 aboard RV Polarstern. Ocean water was pumped onboard the vessel via the bow water system to collect microplastics samples. This dataset contains the results from all 76 sampling stations, in a spreadsheet format.
purpose: These data were collected in order to determine the microplastics concentrations along a latitudinal gradient in the Atlantic Ocean.
credit: Related Funding Agency: Alfred Wegener Institute (AWI), Germany [Project Number: AWI_PS95_00]
credit: Related Funding Agency: Nippon Foundation/POGO
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description: Parameter or Variable: MICROPLASTIC CONCENTRATION (measured); Units: pieces/m3; Observation Category: in situ; Sampling Instrument: Water pump; Sampling and Analyzing Method: This study was conducted onboard the RV Polarstern and covered 7345 nautical miles (13,603 km) between Bremerhaven, Germany and Cape Town, South Africa. Sub-surface oceanic waters pumped onboard the vessel via the underway system were sampled for microplastics. Sampling was conducted during November 2015 (1st to 28th) at vessel speeds of between 8 and 13 knots. Since each sample constituted the filtration of 2000 L of water, the survey effort for this study was 152,000 L of water (76 samples). Seawater from a continuous intake located at the keel of the ship (depth 11 m) was pumped onboard the vessel using a Klaus Union Sealex Centrifugal Pump (Bochum, Germany) at a flow rate of 25 m3/h and transported to the laboratory via stainless steel pipes. Prior to reaching the laboratory, the seawater passed through a primary filter (pore size 2mm) to remove large debris items. The inclusion of this primary filter was standard operating procedure onboard the vessel and thus was beyond the control of the investigator. Potential contamination of the seawater intake by waste water generated onboard did not occur since grey water from the vessel was stored onboard for subsequent treatment. In the laboratory, seawater from the vessel's underway system was allowed to flow through a covered stainless-steel sieve (250 μm) by means of a connection hose fitted into a wooden sieve cover. For the duration of the sampling, the stainless-steel sieve was supported in a wooden stand. For each sample, 2000 L of water was filtered. The length of time taken for the filtration of the specified volume of water was determined by calculation of the flow rate of the seawater. Once the specified volume of water was filtered, the sieve was removed and distilled water used to wash retained material from the sieve into a clean container. The collected material was then filtered under vacuum onto glass microfiber paper (GF/C); Whatman: 47 mm, pore size: 1.2 μm, using a Buchner funnel and a vacuum flask. Each filter paper was then placed into a clean petri dish, covered and stored in a freezer (−20 °C) until returned to the laboratory. At the start and at the end of each sample, positioning data were collected. In the laboratory, filter papers were removed from the freezer, left to dry and then visually examined under a dissecting microscope (Olympus SZX10) equipped with a polarizer and camera (Q Imaging Retiga 2000R). Potential microplastics were isolated and processed (photographed and length measurements taken) prior to transferring to a clean filter paper in a labelled petri dish. All potential microplastics were analyzed by Fourier transform infrared (FT-IR) spectroscopy on a Thermo Scientific Nicolet iN10 FT-IR spectrometer.; Data Quality Method: In order to confirm the polymeric nature, the samples were analyzed by Fourier transform infrared (FT-IR) spectroscopy on a Bruker Vertex 70 Infrared Spectrometer coupled to a Hyperion 1000 microscope. The instrument was equipped with a potassium bromide (KBr) beam splitter and an internal mercury cadmium telluride (MCT) detector. Microscope-transmission sampling was performed using a Specac DC-2 Diamond Compression cell. Spectra were recorded as the average of 32 scans in the spectral wave number range of 4000–600 cm−1 at a resolution of 4 cm−1 (Blackman-Harris 3-term apodisation). Bruker's Opus 7.5 spectroscopy software was used for processing and evaluating all spectra. Prior to analyzing each sample, background scans were performed and sample spectra were automatically corrected. Samples which produced spectra with a match <60% were automatically rejected while those with a match of >70% were automatically accepted. All spectra with matches >60% were individually examined to ensure that there was clear evidence of peaks from the sample corresponding to known peaks of standard polymers and that instances of the misidentification of natural and semi-synthetic polymers was reduced..
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: pump sampler
type: pump sampler
description: generic name for instrument that pumps water from depth to be filtered through a sieve
platform: (MI_Platform)
identifier: (MD_Identifier)
code: RV Polarstern
description: Additional information provided by ICES on 7/9/2009: Polarstern Flag : GERMANY - DE (ISO Country Code) Call Sign : DBLK Title : Research vessel IMO : 8013132 Commissioned Date : 1982-12-01 Current Length : 118 Built : 1982 Notes : Icebreaker rV Information Source : http://www.awi.de/en/infrastructure/ships/polarstern/ () Lloyds URL : http://www.lloydsmiu.com/lmiu/vessels/overview.htm?vesselID=154010
instrument: (missing)
