Chemical, isotopic and gas composition of the first-year sea ice in 2013-2015 from the data of cores taken at the BARNEO drifting stations

• Published in: Ice and Snow
• Main Authors: A. Kizyakov I., I. Streletskaya D., A. Savenko V., I. Kraynyukova A., I. Tokarev V., А. Кизяков И., И. Стрелецкая Д., А. Савенко В., И. Крайнюкова А., И. Токарев В.
• Other Authors: The authors are grateful to S . V. Pisarev, the head of the group of polar oceanology, leading researcher in P. P. Shirshov Institute of Oceanology RAS, to for the opportunity to participate in the work of scientific group on the BARNEO ice camp and the technical support of fieldwork . The processing of data on the sea ice structure was carried out within the framework of the RFBR grant No . 1805-60080 «Dangerous nival-glacial and cryogenic processes and their influence on infrastructure in the Arctic» and Research Program GM 1.5«The Earth cryosphere change under the influence of natural factors and technogenesis» Analysis of snow cover salinity data was carried out according to the RFBR grant No . 16-05-00701 «The response of the snow cover in Antarctic to the recent climate change», Авторы выражают благодарность руководителю группы полярной океанологии Института океанологии им. П .П . Ширшова РАН С .В . Писареву за предоставленную возможность участия в работе научной группы на базе БАРНЕО и техническое обеспечение полевых работ. Обработка данных о строении морского льда выполнена в рамках проекта РФФИ № 180560080 «Опасные нивально-гляциальные и криогенные процессы и их влияние на инфраструктуру в Арктике» и НИР ГЗ 1 .5 . «Изменение криосферы Земли под влиянием природных факторов и техногенеза» . Анализ данных по засолённости снежного покрова выполнен по проекту РФФИ № 160500701 «Реакция снежного покрова Антарктиды на современные изменения климата». Авторы благодарят анонимного рецензента, замечания которого позволили улучшить содержание статьи
• Format: Article in Journal/Newspaper
• Language: Russian
• Published: IGRAS 2019
• Subjects: Arctic; Arctic Ocean; chemical and gas composition; isotopic composition; sea ice; Арктика; изотопный состав; морской лёд; Северный Ледовитый океан; Sea ice; Морской лёд
• Online Access: https://ice-snow.igras.ru/jour/article/view/580; https://doi.org/10.15356/2076-6734-2019-3-387

As a result of the work performed at the BARNEO drifting stations (2013-2015 in the polar region of the Arctic ocean), a comprehensive testing was carried out and new data were obtained on the structure of one-year sea ice, its salinity, the distribution of ions of water-soluble salts, and the content of isotopes δ2H and δ18O within the ice thickness and snow falling on the ice surface. The composition of gas inclusions in the ice was also determined. The distribution of electrical conductivity across the ice thickness, determined by analysis of the cores with a length of 175-178 cm, is typical for such ice - it decreases from top to bottom with two maxima on the lower and upper boundaries of the ice. This is typical characteristic of the first-year sea-ice. Snow cover is characterized by a significant increase in electrical conductivity at the contact with the underlying ice. The chemical composition of the investigated ice-cores and the ratio between its components are similar to the composition of the sea water, although the concentrations of all components are lower than in the initial solution. The composition of gas inclusions in the ice does closely correspond to the atmospheric air, and it practically does not change in depth. The isotopic composition in the cores becomes heavier towards the bottom of the ice. This allows conclusion of a gradual decrease in the contribution of water with a light isotopic composition. The change in the isotopic composition along the ice depth, with the separation of zones with more light isotopes, reflects the changing temperature conditions of ice accumulation (with low isotopic fractionation at rapid freezing under the large temperature gradient) and regional features of the isotopic composition of sea waters in which the ice drift takes place. Salinization of the snow horizon lying on the ice surface provides a possibility of the sea salt transportation not only from surface of open water, but also from the surface of sea ice. This may be used for paleogeographic ...