Lithological and granulometric data for the upper sedimentary layer of the Chaun Bay, East Siberian Sea

The article provides a data on 160 samples of bottom sediments obtained from 48 stations during 60th cruise of R/V Akademik Oparin in the East Siberian Sea in Autumn 2020 (26 September – 11 November). It contains mean diameter of the particles, sorting coefficient, standard deviation, skewness, and kurtosis, values of percentiles (p5, p10, p16, p25, p50, p75, p84, p90, p95), lithology and mass percentage of >2 mm, 1-2 mm, 0.5-1 mm, 250-500 µm, 125-250 µm, 63-125 µm, 31-63 µm, 10-31 µm, 2-10 µm, and <2 µm fractions. The bottom sediments have been sampled in Chaun Bay of the East Siberian Sea from 9 to 21 October 2020 with Ekman (0.25 m2) and Van Veen (0.05 m2) samplers. The grain size data was obtained from laser diffraction method using a SHIMADZU SALD 2300 particle analyser. The data provides an overview on lithology and grain size properties of bottom sediments that will be useful to understand risks for climate changes in the Arctic. The data will help the researchers who work on the Arctic to assess a relationship between grain size properties of the bottom sediments and it sorption potential. A principal component analysis (PCA) can be performed to identify key parameters of the bottom sediments in assessment of sedimentation rates and it changes in the Arctic. Additionally, the data can be used in mapping a spatial distribution of above mentioned parameters for better understanding sedimentation rate changes in the East Siberian Sea and adjacent seas as well.


a b s t r a c t
The article provides a data on 160 samples of bottom sediments obtained from 48 stations during 60th cruise of R/V Akademik Oparin in the East Siberian Sea in Autumn 2020 (26 September -11 November). It contains mean diameter of the particles, sorting coefficient, standard deviation, skewness, and kurtosis, values of percentiles (p5, p10, p16, p25, p50, p75, p84, p90, p95), lithology and mass percentage of > 2 mm, 1-2 mm, 0.5-1 mm, 250-500 μm, 125-250 μm, 63-125 μm, 31-63 μm, 10-31 μm, 2-10 μm, and < 2 μm fractions. The bottom sediments have been sampled in Chaun Bay of the East Siberian Sea from 9 to 21 October 2020 with Ekman (0.25 m 2 ) and Van Veen (0.05 m 2 ) samplers. The grain size data was obtained from laser diffraction method using a SHIMADZU SALD 2300 particle analyser. The data provides an overview on lithology and grain size properties of bottom sediments that will be useful to understand risks for climate changes in the Arctic. The data will help the researchers who work on the Arctic to assess a relationship between grain size properties of the bottom sediments and it sorption potential. A principal component analysis (PCA) can be performed to identify key parameters of the bottom sediments in assessment of sedimentation rates and it changes in the Arctic. Additionally, the data can be used in map-ping a spatial distribution of above mentioned parameters for better understanding sedimentation rate changes in the East Siberian Sea and adjacent seas as well. ©

Value of the data
• The data provides detailed overview on lithology and grain size properties of bottom sediments from Chaun Bay that will be useful to understand risks for climate changes in the Arctic. • The data will help the researchers who work on the Arctic to assess a relationship between grain size properties of the bottom sediments and it sorption potential. • The data will be useful as a baseline for potential contaminant level assessment in Chaun Bay. • The data can be used in mapping spatial distribution of mean diameter of the particles, sorting coefficient, standard deviation, skewness, and kurtosis for better understanding a sedimentation rate changes in the East Siberian Sea and adjacent seas as well.

Objective
The data represents a strong set that can help to characterise lithodynamics and sedimentation rates in the East Siberian Sea as a part of periglacial Arctic shelf. It is useful in assessment of the environmental state and potential risks of climate changing in the Arctic basin. A principal component analysis (PCA) can be performed to identify key parameters of the bottom sediments in assessment of sedimentation rates and it changes in the Arctic. Table 1 List of the calculated grain size parameters. p -percentiles of the particle size distribution of each sample calculated in mm; φ -percentiles of the particle size distribution of each sample calculated according to [3] .

Parameter Equation
Refs.

Mean diameter
Sorting coefficient Standard deviation

Data Description
The samples of bottom sediments were obtained during 60 th cruise of R/V Akademik Oparin to the East Siberian Sea in Autumn 2020 (26 September -11 November). The expedition was organised by Il'ichev Pacific Oceanological Institute FEB RAS (Vladivostok) in collaboration with Lomonosov Moscow State University (Moscow) and Shirshov Institute of Oceanology RAS (Moscow). The bottom sediments have been sampled within Chaun bay from 9 to 21 October 2020 according to IAEA-TECDOC-1360 protocol [2] using Ekman (0.25 m 2 ) and Van Veen (0.05 m 2 ) grab samplers. The sampling procedures have been performed during the absence of landfast and sea ice. Table 1 contains a list of the calculated grain size parameters of the bottom sediments. Table 2 contains station numbers, GPS coordinates, sea water depth, sampling dates, and lithological characteristics of the sampled bottom sediments.

Ethics Statements
No human subjects, animal experiments, or data collected from social media platforms were used.

Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability
Grain size properties of bottom sediments from the Chaun Bay, East Siberian Sea