Sea-ice processes in the Laptev Sea and their importance for sediment export

Eicken, Hajo; Reimnitz, Erk; Alexandrov, V.; Martin, Torge; Kassens, Heidemarie; Viehoff, T.

doi:10.1016/s0278-4343(96)00024-6

Cited by 154 publications

(96 citation statements)

References 20 publications

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“…The annual transport agent is suggested to be plucking, as parts of the ice foot containing frozen in beach sediments, detach and float away (Eicken et al 1997;Are et al 2008;Strzelecki 2011a;Irvine 2013). This is supported by the presence of an ice foot at all study sites during each winter throughout the observation period.…”

Section: Eg Sessford Et Almentioning

confidence: 99%

Terrestrial processes affecting unlithified coastal erosion disparities in central fjords of Svalbard

Sessford

Bæverfjord

Hormes³

2015

Polar Research

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Section: Eg Sessford Et Almentioning

confidence: 99%

Terrestrial processes affecting unlithified coastal erosion disparities in central fjords of Svalbard

Sessford

Bæverfjord

Hormes³

2015

Polar Research

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“…1). Because of the patchy ice conditions on the Laptev Sea shelf, greatly differing values for the ice velocity have been reported (Colony and Thorndike, 1984;Eicken et al, 1997;Rigor and Colony, 1997;Eicken et al, 2000;Martin and Augstein, 2000), but 0.1 m/s seems to be a reasonable estimate (Haas, pers. commun., 2006).…”

Section: Source and Transport Of The Lithogenic Mattermentioning

confidence: 99%

“…1) is characterized by high export rates of sea ice and high input of suspended and dissolved material by Siberian rivers, both having a great influence on the sedimentary and chemical budgets of the entire Arctic Ocean (Eicken et al, 1997(Eicken et al, , 2000Holmes et al, 2002;. A major contributor is the Lena River (discharge ¼ 523 km 3 /yr), transporting large amounts of dissolved and particulate material, i.e., chemical elements, lithogenic and terrestrial/fluvial organic matter, and nutrients.…”

Section: Introductionmentioning

confidence: 99%

Lithogenic and biogenic particle fluxes on the Lomonosov Ridge (central Arctic Ocean) and their relevance for sediment accumulation: Vertical vs. lateral transport

Fahl

Nöthig

2007

Deep Sea Research Part I: Oceanographic Research Papers

109

107

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Investigations of lithogenic and biogenic particle fluxes using long-term sediment traps are still very rare in the northern high latitudes and are restricted to the arctic marginal seas and sub-arctic regions. Here data on the variability of fluxes of lithogenic matter, CaCO 3 , opal, and organic carbon and biomarker composition from the central Arctic Ocean are presented for a 1-year period. The study was carried out on material obtained from a long-term mooring system equipped with two multi-sampling traps, at 150 and 1550 m depth, and deployed on the southern Lomonosov Ridge close to the Laptev Sea continental margin from September 1995 to August 1996. In addition, data from surface sediments were included in the study. Annual fluxes of lithogenic matter, CaCO 3 , opal, and particulate organic carbon were 3.9, 0.8, 2.6, and 1.5 g m À2 y À1 , respectively, in the shallow trap and 11.3, 0.5, 2.9, and 1.05 g m À2 y À1 , respectively, in the deep trap.Both the shallow and the deep trap showed significant variations in vertical flux over the year. Higher values were found from mid-July to the end of October (total mass flux of 75-130 mg m À2 d À1 in the shallow trap and 40-225 mg m À2 d À1 in the deep trap). During all other months, fluxes were fairly low in both traps (most total mass flux values o10 mg m À2 d À1 ). The interval of increased fluxes can be separated into (1) a mid-July/August maximum caused by increased primary production as documented in high abundances of marine biomarkers and diatoms and (2) a September/October maximum caused by increased influence of Lena River discharge indicated by maximum lithogenic flux and large amounts of terrigenous/fluvial biomarkers in both traps. During September/October, total mass fluxes in the deep trap were significantly higher than in the shallow trap, suggesting a lateral sediment flux at greater depth. The lithogenic flux data also support the importance of sediment input from the Laptev Sea for the sediment accumulation on the Lomonosov Ridge on geological time scales, as indicated in sedimentary records from this region. r

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“…In addition, a number of studies examine sea ice circulation patterns and their linkage to atmospheric and oceanic forcing on shorter timescales (e.g. Rigor and Colony, 1997;Eicken et al, 1997;Haas and Eicken, 2001).…”

Section: Introductionmentioning

confidence: 99%

Variability and trends in Laptev Sea ice outflow between 1992–2011

et al. 2013

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Abstract. Variability and trends in seasonal and interannual ice area export out of the Laptev Sea between 1992 and 2011 are investigated using satellite-based sea ice drift and concentration data. We found an average total winter (October to May) ice area transport across the northern and eastern Laptev Sea boundaries (NB and EB) of 3.48 × 10 5 km 2 . The average transport across the NB (2.87 × 10 5 km 2 ) is thereby higher than across the EB (0.61 × 10 5 km 2 ), with a less pronounced seasonal cycle. The total Laptev Sea ice area flux significantly increased over the last decades (0.85 × 10 5 km 2 decade −1 , p > 0.95), dominated by increasing export through the EB (0.55 × 10 5 km 2 decade −1 , p > 0.90), while the increase in export across the NB is smaller (0.3 × 10 5 km 2 decade −1 ) and statistically not significant. The strong coupling between across-boundary SLP gradient and ice drift velocity indicates that monthly variations in ice area flux are primarily controlled by changes in geostrophic wind velocities, although the Laptev Sea ice circulation shows no clear relationship with large-scale atmospheric indices. Also there is no evidence of increasing wind velocities that could explain the overall positive trends in ice export. The increased transport rates are rather the consequence of a changing ice cover such as thinning and/or a decrease in concentration. The use of a back-propagation method revealed that most of the ice that is incorporated into the Transpolar Drift is formed during freeze-up and originates from the central and western part of the Laptev Sea, while the exchange with the East Siberian Sea is dominated by ice coming from the central and southeastern Laptev Sea. Furthermore, our results imply that years of high ice export in late winter (February to May) have a thinning effect on the ice cover, which in turn preconditions the occurence of negative sea ice extent anomalies in summer.

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Sea-ice processes in the Laptev Sea and their importance for sediment export

Cited by 154 publications

References 20 publications

Terrestrial processes affecting unlithified coastal erosion disparities in central fjords of Svalbard

Terrestrial processes affecting unlithified coastal erosion disparities in central fjords of Svalbard

Lithogenic and biogenic particle fluxes on the Lomonosov Ridge (central Arctic Ocean) and their relevance for sediment accumulation: Vertical vs. lateral transport

Variability and trends in Laptev Sea ice outflow between 1992–2011

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