Spatial and temporal variability of sea ice in the Laptev Sea: Analyses and review of satellite passive-microwave data and model results, 1979 to 2002

Bareiss, Jörg; Goergen, Klaus

doi:10.1016/j.gloplacha.2004.12.004

Cited by 81 publications

(98 citation statements)

References 67 publications

(129 reference statements)

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“…Satellite passive microwave ice concentration data show that the southern Lomonosov Ridge, close to the Eurasian continental margin, is generally covered by more than 95% ice during most of the season, and even during summer ice concentration remains above 90% (Haas and Eicken, 2001). Sea-ice cover in the study area, however, shows a distinct interannual variability, and sometimes ice-free areas occur (Comiso, 2002;Comiso and Parkinson, 2004;Bareiss and Go¨rgen, 2005). Because of the extensive sea-ice cover and light limitation, primary production is restricted to a period of about 3 months during summer (Sakshaug, 2004).…”

Section: Resultsmentioning

confidence: 83%

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

108

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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Section: Resultsmentioning

confidence: 83%

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

108

107

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“…This phase is characterized by an aboveaverage winter ice area flux through the northern boundary. In contrast, during positive AO phases when the Transpolar Drift is shifted east towards the North American Arctic (Bareiss and Goergen, 2005), most of the sea ice is exported from the Laptev Sea to the East Siberian Sea across the eastern boundary. Alexandrov et al (2000) who found that the magnitude and direction of Laptev Sea ice exchange with surrounding seas agrees well with the large-scale drift pattern during periods of prevailing anticyclonic or cyclonic circulation.…”

Section: Linkage Between Ice Area Flux and Large-scale Atmospheric CImentioning

confidence: 96%

“…The Laptev Sea is located between the coast of Siberia, Severnaya Zemlya and the New Siberian Islands (Fig. 1), and is icecovered from October to June (Bareiss and Goergen, 2005). The ice cover can be divided into three regimes: the fast ice, the pack ice, and flaw polynyas (Eicken et al, 2005).…”

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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“…9, upper grey line), originates from the coastal polynyas on the Eurasian shelves in the Laptev Sea and the Kara Sea, where the river mouths are in close proximity. The so called "Great Siberian Polynya" is a reoccurrent flaw lead, which is opened by wind forcing mainly in autumn and late winter and is present on the Siberian shelves over ~30 m water depth at the border between the land-fast ice and the pack ice (Zakharov, 1966;Martin and Cavalieri, 1989;Bareiss and Görgen, 2005). On these shallow Siberian shelf regions the fraction of river water f r and the brine influence (neg.…”

Section: F R / F I Ratios At High River Water Fractionsmentioning

confidence: 99%

“…About 10 % of the world's river discharge is released onto the Arctic shelf areas. But also large amounts of sea-ice are produced on the shelves by a change from ice-free conditions in summer to freeze-up in autumn and a nearly continuous production of sea-ice in polynyas during winter (Martin and Cavalieri 1989;Bareiss and Görgen, 2005). Between 1979 and 2007, Arctic ice cover declined by ~11 % per decade, and in summer 2007 it was about 37 % less than the average for this period (Comiso et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Origin of freshwater and polynya water in the Arctic Ocean halocline in summer 2007

Bauch

Loeff

Andersen

et al. 2011

Progress in Oceanography

189

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Spatial and temporal variability of sea ice in the Laptev Sea: Analyses and review of satellite passive-microwave data and model results, 1979 to 2002

Cited by 81 publications

References 67 publications

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

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

Origin of freshwater and polynya water in the Arctic Ocean halocline in summer 2007

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