Organic matter deposition along the Kara and Laptev Seas continental margin (eastern Arctic Ocean) during last deglaciation and Holocene: evidence from organic–geochemical and petrographical data

Boucsein, Bettina; Knies, Jochen; Stein, Rüdiger

doi:10.1016/s0025-3227(01)00249-3

Cited by 33 publications

(14 citation statements)

References 53 publications

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“…For characterization of the different organic carbon sources (i.e., marine vs. terrigenous) and interpretation of the data in terms of paleoenvironmental changes, several studies have been carried out in the past on the organic-carbon fraction of Core PS2458-4 (Fahl and Stein, 1999;Stein et al, 2001;Boucsein et al, 2002;. Furthermore, Spielhagen et al (2005) carried out a study of oxygen and carbon isotopes of the planktic foraminifer species Neogloboquadrina pachyderma sin.…”

Section: Change In Deglacial To Holocene Sea Ice Cover As Deduced Fromentioning

confidence: 99%

Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records

Fahl

Stein

2012

Earth and Planetary Science Letters

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Keywords:Arctic Ocean sea ice biomarker IP 25 Younger Dryas sediment trap a b s t r a c t For the reconstruction of sea-ice variability, a biomarker approach which is based on (1) the determination of sea-ice diatom-specific highly-branched isoprenoid (IP 25 ) and (2) the coupling of phytoplankton biomarkers and IP 25 has been used. For the first time, such a data set was obtained from an array of two sediment traps deployed at the southern Lomonosov Ridge in the central Arctic Ocean at water depth of 150 m and 1550 m and recording the seasonal variability of sea ice cover in 1995/1996. These data indicate a predominantly permanent sea ice cover at the trap location between November 1995 and June 1996, an ice-edge situation with increased phytoplankton productivity and sea-ice algae input in July/ August 1996, and the start of new-ice formation in late September. The record of modern sea-ice variability is then used to better interpret data from sediment core PS2458-4 recovered at the Laptev Sea continental slope close to the interception with Lomonosov Ridge and recording the post-glacial to Holocene change in sea-ice cover.Based on IP 25 and phytoplankton biomarker data from Core PS2458-4, minimum sea-ice cover was reconstructed for the Bølling/Allerød warm interval between about 14.5 and 13 calendar kyr BP, followed by a rapid and distinct increase in sea-ice cover at about 12.8 calendar kyr BP. This sea-ice event was directly preceded by a dramatic freshwater event and a collapse of phytoplankton productivity, having started about 100 years earlier. These data are the first direct evidence that enhanced freshwater flux caused enhanced sea-ice formation in the Arctic at the beginning of the Younger Dryas. In combination with a contemporaneous, abrupt and very prominent freshwater/meltwater pulse in the Yermak Plateau/ Fram Strait area these data may furthermore support the hypothesis that strongly enhanced freshwater (and ice) export from the Arctic into the North Atlantic could have played an important trigger role for the onset of the Younger Dryas cold reversal. During the Early Holocene, sea-ice cover steadily increased again (ice-edge situation), reaching modern sea-ice conditions (more or less permanent sea-ice cover) probably at about 7-8 calendar kyr BP.

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Section: Change In Deglacial To Holocene Sea Ice Cover As Deduced Fromentioning

confidence: 99%

Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records

Fahl

Stein

2012

Earth and Planetary Science Letters

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120

102

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“…Due to the absence of any absolute AMS 14 C age control, precise climatic reconstructions and correlations with similar data sets from the Barents and Laptev seas have not been possible. Based on a study of AMS 14 C dated sediment cores from the St. Anna Trough, more detailed information about the glacial/deglacial history and related Atlantic water and freshwater inflows in the northern Kara Sea became available (Polyak et al, 1997;Lubinski et al, 2001;Boucsein et al, 2002). The recovery of glacigenic diamictons in sediment cores from the St. Anna Trough provides evidence for grounded glacier ice which may have reached the shelf edge during the Last Glacial Maximum (Polyak et al, 1997).…”

Section: Holocene Changes In Sediment Accumulation and Paleoenvironmementioning

confidence: 99%

Arctic (palaeo) river discharge and environmental change: evidence from the Holocene Kara Sea sedimentary record

STEIN¹

2004

Quaternary Science Reviews

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In this paper, we summarize data on terrigenous sediment supply in the Kara Sea and its accumulation and spatial and temporal variability during Holocene times. Sedimentological, organic-geochemical, and micropaleontological proxies determined in surface sediments allow to characterize the modern (riverine) terrigenous sediment input. AMS-14 C dated sediment cores from the Ob and Yenisei estuaries and the adjacent inner Kara Sea were investigated to determine the terrigenous sediment fluxes and their relationship to paleoenvironmental changes. The variability of sediment fluxes during Holocene times is related to the post-glacial sea-level rise and changes in river discharge and coastal erosion input. Whereas during the late/middle Holocene most of the terrigenous sediments were deposited in the estuaries and the areas directly off the estuaries, huge amounts of sediments accumulated on the Kara Sea shelf farther north during the early Holocene before about 9 Cal. kyr BP. The maximum accumulation at that time is related to the lowered sea level, increased coastal erosion, and increased river discharge. Based on sediment thickness charts, echograph profiles and sediment core data, we estimate an average Holocene (0-11 Cal. kyr BP) annual accumulation of 194 Â 10 6 t yr À1 of total sediment for the whole Kara Sea. Based on late Holocene (modern) sediment accumulation in the estuaries, probably 12 Â 10 6 t yr À1 of riverine suspended matter (i.e., about 30% of the input) may escape the marginal filter on a geological time scale and is transported onto the open Kara Sea shelf. The high-resolution magnetic susceptibility record of a Yenisei core suggests a short-term variability in Siberian climate and river discharge on a frequency of 300-700 yr. This variability may reflect natural cyclic climate variations to be seen in context with the interannual and interdecadal environmental changes recorded in the High Northern Latitudes over the last decades, such as the NAO/AO pattern. A major decrease in MS values starting near 2.5 Cal. kyr BP, being more pronounced during the last about 2 Cal. kyr BP, correlates with a cooling trend over Greenland as indicated in the GISP-2 Ice Core, extended sea-ice cover in the North Atlantic, and advances of glaciers in western Norway. Our still preliminary interpretation of the MS variability has to be proven by further MS records from additional cores as well as other highresolution multi-proxy Arctic climate records. r

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“…The few existing Arctic Ocean organic petrological studies of marine sediments are limited to Neogene and Quaternary sediments (e.g., Wagner and Henrich, 1994;Hö lemann and Henrich, 1994;Boucsein et al, , 2002. Studies of the particulate OM facilitate reconstruction of depositional settings and the factors controlling accumulation and preservation of OM.…”

Section: Introductionmentioning

confidence: 99%

Black shale formation in the late Paleocene/early Eocene Arctic Ocean and paleoenvironmental conditions: New results from a detailed organic petrological study

Boucsein

Stein

2009

Marine and Petroleum Geology

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Organic matter deposition along the Kara and Laptev Seas continental margin (eastern Arctic Ocean) during last deglaciation and Holocene: evidence from organic–geochemical and petrographical data

Cited by 33 publications

References 53 publications

Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records

Modern seasonal variability and deglacial/Holocene change of central Arctic Ocean sea-ice cover: New insights from biomarker proxy records

Arctic (palaeo) river discharge and environmental change: evidence from the Holocene Kara Sea sedimentary record

Black shale formation in the late Paleocene/early Eocene Arctic Ocean and paleoenvironmental conditions: New results from a detailed organic petrological study

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