Paleoclimatology: A Record from the Deep Containing fossilized microscopic plants and animals and bits of dust swept from the …Web
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Sediment cores from multiple expeditions to the difficult-to-reach, ice-filled part of the Arctic Ocean are stored here, representing a gold mine for a marine geologist.Web
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Four sediment cores were collected from the Arctic Ocean (Fig. 1), using a box core sampler on board the R/V Xuelong during the cruise of the sixth Chinese National Arctic Research Expedition in summer (July–August) of 2014.One core (R07) was collected on the Chukchi shelf and three cores (R09, R11 and R14) were collected on the slope of …Web
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In the present paper, we do not attempt to reconcile these conflicting Quaternary chronostratigraphies. Instead, we intend to further document the behavior of 230 Th excesses (230 Th xs) in Arctic sedimentary sequences, aiming to constrain their use as a chronostratigraphic tool.We use cores raised from site PS2757 on the southern …Web
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Remote sensing data indicate earlier ice arch break-up, leading to sea ice export from the Arctic Ocean into the Baffin Bay via the Nares Strait 18,19, which allows for increased late spring ...Web
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A subpolar species associated with Atlantic water expanded far into the Arctic Ocean during the Last Interglacial, analysis of microfossil content of sediment cores …Web
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The author combines and compares grain size, marine microfossil, and biomarker data from the ACEX sediment cores with information from terrestrial climate data, other Arctic and global marine ...Web
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The 1994 Arctic Ocean Section (or AOS94) collected Mark III box cores (40 × 40 × 60 cm) along a transect from the Mendeleev Ridge to the Lomonosov Ridge 53. Each box core was subsampled with 10 ...Web
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New research led by scientists from Princeton University shows how the supply of nitrogen to the Arctic has changed since the last ice age, which reveals the history of Arctic Ocean stratification.Web
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Four sediment cores were collected from the Arctic Ocean during a cruise of the sixth Chinese National Arctic Research Expedition in July–August 2014. One core (R07) was collected on the Chukchi shelf (73 m), and three cores (R09, R11, and R14) were collected on the continental slope (184, 343, 742 m) (Figure S1 in the supporting information).Web
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The Arctic Ocean (Fig. 1) is unique among modern ocean basins in its high percentage of year-round ice cover.The proportion of multi-year sea ice, along with summertime sea ice cover, has diminished dramatically over the past few decades (Polyak and Jakobsson, 2011), yet recent trends in ice loss are nevertheless thought to be …Web
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Sediment cores from the East Siberian and Chukchi margins and adjacent basins are used to refine the upper Pleistocene stratigraphy and better constrain the timing of major glacial advances in the western Arctic Ocean. Cores have been analysed using high-resolution non-destructive physical properties (density, magnetic susceptibility and …Web
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dance peaks at the top of the cores (upper part of OIS 1) and downcore in the middle of OIS 3. The downcore pattern of abundance variations of N. pachyderma is similar between the cores (Fig. 2) and in the other western Arctic cores that have been examined from the Arctic Ocean sec-tion transect (Darby et al.,1997). Neogloboquad-Web
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Abstract. Biogeochemical cycling in the semi-enclosed Arctic Ocean is strongly influenced by land–ocean transport of carbon and other elements and is vulnerable to environmental and climate changes. Sediments of the Arctic Ocean are an important part of biogeochemical cycling in the Arctic and provide the opportunity to study present and …Web
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Arctic Ocean surface waters hold the most plastics of any ocean basin. ... Hallanger's own samples, which also include ice cores, pieces of newly formed "pancake" ice, and deeper seawater ...Web
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Pathway and microplastic content of sea ice cores in the Central Arctic. a Sampling position of sea ice cores (A–E) obtained during three Polarstern expeditions overlaid with the sea ice ...Web
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In this study we test new, multi-proxy approaches to stratigraphy and depositional history of the central Arctic Ocean based on sediment core ARC5-ICE4 (ICE4) from a site in the Eurasian (Amundsen) Basin adjacent to the Lomonosov Ridge (LR) (Fig. 1).The LR is a major regional geological structure that traverses the Arctic Ocean from …Web
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A core of sediments taken from underneath the Arctic Ocean provides evidence that ocean conditions could support a free-floating fern, Azolla, during the middle Eocene epoch, roughly 50 million ...Web
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Two of these cores, Core PS2200-5 and Core PS51/038-3, are located in the central Arctic Ocean characterized by a perennial sea ice cover today (Fig. 1; 8–10/10 summer sea ice concentration).Web
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Arctic Ocean, smallest of the world's oceans, centering approximately on the North Pole. The Arctic Ocean and its marginal seas are the least-known basins and bodies of water in the world ocean as a result of their remoteness, hostile weather, and perennial or seasonal ice cover. ... All the other cores collected contain younger sediments ...Web
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Using a coupled atmosphere-sea-ice-ocean column model, Stranne et al. 27 suggest the possibility of an Arctic Ocean-wide transition to a seasonal sea-ice regime during the Early Holocene ...Web
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The authors examined sediment cores from across the Arctic and Nordic seas, and found that 230 Th ex is absent in several layers of sediment deposited during the past 200,000 years.Web
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Abstract. The oxygen isotopic composition of benthic foraminiferal tests (δ18Ob) is one of the pre-eminent tools for correlating marine sediments and interpreting past terrestrial ice volume and deep-ocean temperatures. Despite the prevalence of δ18Ob applications to marine sediment cores over the Quaternary, its use is limited in the …Web
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Methods: USGS researchers, collaborating with scientists in the United States, Sweden, Germany and elsewhere, are collecting evidence from sediment cores in the Arctic Ocean and adjacent seas and land masses. The cores are used to determine how Arctic systems were affected by changing climate in the past and to help predict …Web
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Sea ice cover in the Arctic has been steadily decreasing over recent decades, with record losses in recent years 1, 2. The late-summer ice cover, mainly composed of thick multi-year ice, has been ...Web
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Princeton researchers set up camp on the blue ice of the Allan Hills in Antarctica, where they collect ice cores containing ancient air. ... As the Arctic Ocean warms and sea ice shrinks, will the newly exposed sea surface see a plankton population boom and a burgeoning ecosystem in the open Arctic Ocean? Not likely, say a team of …Web
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Yellow stars mark the sites where sediment cores were taken from the bottom of the ocean. Depths are based on the International Bathymetric Chart of the Arctic Ocean (IBCAO, ). Image courtesy of Martin Jakobsson, Stockholm University.Web
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Schematic map of the Arctic Ocean showing the coring sites for sediment records used in this study: Star represents core ARC5-MA01; red circles are referenced cores from the central Arctic Ocean (see …Web
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The evidence comes from high abundances of the subpolar planktic foraminifera Turborotalita quinqueloba in five newly analysed cores. The northern …Web
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Time series of the biomarkers based on marine deep cores obtained from the continental margins of East Greenland between ... and Björk, G., Arctic Ocean perennial sea ice breakdown during the Early Holocene insolation maximum, Quat. Sci. Rev., 2014, vol. 92, pp. 123–132. Article Google Scholar Stroeve, J. and Notz, D ., Changing state of ...Web
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A second study 2, subsequently examined 5 sea ice cores from the Arctic Ocean, reported on the presence of smaller (<100 µm in diameter), more diverse types of synthetic polymers (n = 17) and...Web
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Published: 16 August 2021 Arctic Ocean stratification set by sea level and freshwater inputs since the last ice age Jesse R. Farmer, Daniel M. Sigman, Julie Granger, Ona M. …Web
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The Arctic Ocean is a critical component of the global climate system and has been experiencing rapid climate changes in the last century (Serreze and Barry, 2011; Chen et al., 2021a). ... coupled with Pb-210 dating to investigate the historical deposition and source identification of metals in sediment cores collected from the Bering Sea and ...Web
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