Abundances of microplastics concentrations collected from R/V Mediterranean Explorer in the oligotrophic Israeli Mediterranean coastal waters from 2013-07-25 to 2015-05-18 (NCEI Accession 0260245)

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This study estimated the seasonal abundances of sea surface microplastics (i.e. plastics measuring 0.3mm- 5mm, reported in unit of pieces/m^3) at 17 sites along the Israeli Mediterranean coastal waters from 2013-07-25 to 2015-05-18. Data was collected using a manta net. This dataset contains the results from all 108 net tows, in a spreadsheet format. Tows were conducted for 15 minutes along shore at an average cruising speed of 2 knots.

Assessment of surface microplastics abundance in the Mediterranean Sea collected aboard R/V Tara from 2014-06-03 to 2014-11-08 (NCEI Accession 0270530)

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This study assessed the load of surface microplastics (i.e. plastics less than 5mm, reported in unit of pieces/m^3) abundance at 124 sites in the Mediterranean Sea from 2014-06-03 to 2014-11-08. Microplastics data were collected aboard R/V Tara using manta net, towed at the top 10 cm of the sea surface with an average speed of 2.5-3 knots for 60 minutes. This dataset contains the results from all surface net tows, in a spreadsheet format.

Floating microplastics abundance in open and coastal waters of the Eastern Mediterranean Sea (Adriatic, Aegean, Ionian, and Levantine Seas) from 2014-10-09 to 2020-02-10 (NCEI Accession 0259524)

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This study estimated the load of floating microplastics (i.e. plastics less than 5mm, reported in unit of pieces/m^3) in the Eastern Mediterranean Sea (Adriatic, Aegean, Ionian, and Levantine Seas) from 2014-10-09 to 2020-02-10. Data was collected using manta net. This dataset contains the results from all 76 net tows, in a spreadsheet format. Tows were conducted for 15–30 min at an average cruising speed of <2 knots.

Microplastics concentration in the northern South China Sea from 2018-08-07 to 2018-08-22 (NCEI Accession 0276267)

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This study was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/m^3) concentration in the northern South China Sea. Microplastics data was collected from 2018-08-07 to 2018-08-22 using stainless steel buckets. This dataset contains the results from all 69 sampling efforts, in a spreadsheet format.

Microplastic concentrations on beaches along the eastern Gulf of Thailand from 2019-04-11 to 2019-05-28 (NCEI Accession 0278059)

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This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/kg d.w.) on beaches along the eastern Gulf of Thailand from 2019-04-11 to 2019-05-28. Microplastic data were collected using a metal spoon. This dataset contains the results from all 34 sediment samples, in a spreadsheet format.

Microplastic concentrations on beaches along the western Gulf of Thailand during 2019-09-22 (NCEI Accession 0278060)

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This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/kg d.w.) on beaches along the western Gulf of Thailand during 2019-09-22. Microplastic data were collected using a metal spoon. This dataset contains the results from all 25 beach samples, in a spreadsheet format.

Floating microplastics concentration collected from RV Angeles Alvarino and RV IV Lluerna in the Western Mediterranean Sea from 2015-03-17 to 2015-06-05 (NCEI Accession 0253140)

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This study estimated the load of floating microplastics in the Western Mediterranean Sea. Data was collected aboard RV Angeles Alvarino and RV IV Lluerna using manta trawl net. This dataset contains the results from all 21 net tows, in a spreadsheet format. Tows were conducted for 15–20 min at an average cruising speed of 3 knots (1.5ms−1). The study found an average microplastic concentrations of 0.410 ± 0.361 pieces/m3.

Abundance of microplastics in beaches along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08 (NCEI Accession 0282703)

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This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/kg d.w) in beach sediments along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08. Microplastics in the sediments were collected using a shovel. This dataset contains the results from all 36 sediment samples, in a spreadsheet format.

Microplastic concentrations in deep-sea sediments from Rockall Trough (Scotland, UK) collected aboard RRS Discovery on 2017-05-18 (NCEI Accession 0278002)

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This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces per g d.w.) in deep-sea sediments from Rockall Trough (Scotland, UK) on 2017-05-18. Microplastic data were collected aboard RRS Discovery using a megacorer. This dataset contains the results from all 90 deep-sea sediment samples, in a spreadsheet format.

Surface microplastics concentration collected from R/V URANIA in the Mediterranean Sea from 2013-05-09 to 2013-06-24 (NCEI Accession 0253450)

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This study involved a large-scale survey of neustonic microplastics floating in Mediterranean waters. It estimated the abundance and geographical distribution of microplastics in the Mediterranean Sea. This dataset contains all 74 neuston net samples collected during two consecutive cruises carried out on board R/V Urania, in a spreadsheet format. The study estimated a mean total of 3.1 × 10^12 microplastics for the whole Mediterranean.