The study investigated vertical particle fluxes and associated environmental parameters in the southern part of the Kara Sea in September 2022 on the basis of a 5-day deployment of two moored Automatic Deep-Sea Sedimentation Observatories with sediment traps and CTD, currents and hydrooptical profilers.
The studies have shown that the distribution of suspended particulate organic carbon in the seas of the Russian Arctic is characterized by сircumcontinental and vertical zonalities. These zonalities are manifested in decreasing concentrations and therefore fluxes (mgC/m2 /day) of suspended particulate organic carbon in the transition from the near-continental to pelagic areas of the Arctic Ocean, as well as from the surface photic layer to the near-bottom layer by two orders of magnitude, which is confirmed by instrumental data of sedimentation traps and correlates with the zoning of bio-production processes.
A spatio-temporal dependence between the vertical fluxes of the deposited matter (according to the data of sediment traps (mg/m2/day)) and the mass concentration of suspended matter (mg/L) has been revealed. Using satellite data of the optical range (using the spectral channels of the MODIS–Aqua 531 and 551 nm scanner, the backscattering index by suspended particles (bbp, m–1) was calculated), it became possible to continuously obtain (for the ice-free period) monthly average data on the values of the vertical flux of sedimentary matter from the surface layer for the entire sea.
We discuss the measurements of aerosol characteristics (aerosol and black carbon concentrations and aerosol optical depth) in 80th cruise of RV Akademik Mstislav Keldysh (August 2020) on the route from the Baltic to Barents Sea. We compare them with results from two previous expeditions (67th and 71st cruises of RV Akademik Mstislav Keldysh) and statistically generalize the data from three marine regions. The average aerosol and black carbon concentrations over the Baltic and North Seas are shown to be a factor of 2-3 larger than over the Arctic seas, i.e., Barents and Norwegian Seas. No significant differences between aerosol characteristics over Arctic seas are revealed. We discuss the average latitude-longitude distributions of aerosol characteristics, calculated on the basis of expedition measurements and MERRA-2 reanalysis data.
A comparative analysis of measurements of black carbon concentrations in the composition of atmospheric aerosol is carried out using two aethalometry methods: on the basis of collecting aerosol samples on filters and with the use of aethalometer. The two independent techniques for measuring the black carbon concentrations are shown to well agree: the cross-correlation coefficient is 0.87, the standard deviation is 17 ng/m3, and the systematic component is 0.65 ng/m3.
We discuss the measurements of black carbon concentrations in the composition of atmospheric aerosol over seas of the North Atlantic and European sector of the Arctic Ocean (21 expeditions). A comparative analysis of statistical characteristics, calculated for separate marine regions, is carried out. A higher black carbon content in the atmosphere of the North Sea and in the south of the Barents Sea is noted. We present estimates of the average latitude-longitude distribution of aerosol characteristics, measured in expeditions, in comparison with MERRA-2 reanalysis data.
The work reports the results of the measurements of particulate matter (PM), organic (OC) and elemental (EC) carbon mass concentrations, and carbon isotope composition (δ13С) in atmospheric aerosol sampled along the route of the research vessel “Academician Mstislav Keldysh” (71 voyage). The measurements were carried out over the Baltic Sea – the North Sea – the North Atlantic – the Norwegian Sea – the Barents Sea from June to August 2018. The increased OC, EC concentrations and the high δ13С value in the samples collected off the coast of Greenland are shown to be not due to marine origin, but due to the transfer of atmospheric aerosol formed in Canada during biomass burning (forest fires).
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