Sea ice circulation in the Laptev Sea and ice export to the Arctic Ocean: Results from satellite remote sensing and numerical modeling

Alexandrov, V.; Martin, Thomas; Kolatschek, J.; Eicken, Hajo; Kreyscher, Martin; Makshtas, Alexandr P.

doi:10.1029/2000jc900029

Cited by 40 publications

(44 citation statements)

References 22 publications

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“…The ice exchange of the Laptev Sea with surrounding seas were investigated for the first time by Zakharov (1966a) and Zakharov (1967) using monthly gradients of atmospheric pressure for the period between 1937 and 1958. According to Alexandrov et al (2000), the authors found the ice exchange between fall and spring to be within the range of our findings. However, the publication is available in Russian only, which makes a direct comparison with our estimates difficult.…”

Section: Discussion Of Area Flux Estimatessupporting

confidence: 62%

“…However, the publication is available in Russian only, which makes a direct comparison with our estimates difficult. Sea ice circulation in the Laptev Sea and ice exchange with the Arctic Ocean have been further studied by Alexandrov et al (2000). The authors investigated ice exchange through the NB and EB based on a large-scale thermodynamic-dynamic sea ice model from 1979 to 1995.…”

Section: Discussion Of Area Flux Estimatesmentioning

confidence: 99%

“…The NB spans a length of 700 km and is positioned at 81 • N, between Cape Arkticheskiy and 140 • E. The EB, with a length of 460 km, connects the eastern end of the NB with Kotelnyy (76.6 • N, 140 • E). For easier comparison, our northern and eastern boundaries are equivalent to those boundaries used by Alexandrov et al (2000).…”

Section: Dataset Description and Validationmentioning

confidence: 99%

“…The seasonal and interannual variability of sea ice exchange with the surrounding seas was first examined by Zakharov (1966bZakharov ( , 1967. Following Alexandrov et al (2000), their estimates are based on average monthly gradients of atmospheric pressure across the northern and northeastern Laptev Sea boundaries and revealed a mean winter sea ice area transport of approximately 3.3 × 10 5 km 2 . Alexandrov et al (2000) investigated ice area fluxes by means of a numerical model and found flow rates of 4.83 × 10 5 km 2 per winter.…”

Section: Introductionmentioning

confidence: 99%

“…Following Alexandrov et al (2000), their estimates are based on average monthly gradients of atmospheric pressure across the northern and northeastern Laptev Sea boundaries and revealed a mean winter sea ice area transport of approximately 3.3 × 10 5 km 2 . Alexandrov et al (2000) investigated ice area fluxes by means of a numerical model and found flow rates of 4.83 × 10 5 km 2 per winter. In addition, a number of studies examine sea ice circulation patterns and their linkage to atmospheric and oceanic forcing on shorter timescales (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussion Of Area Flux Estimatessupporting

confidence: 62%

Section: Discussion Of Area Flux Estimatesmentioning

confidence: 99%

Section: Dataset Description and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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Sea‐ice retreat controls timing of summer plankton blooms in the Eastern Arctic Ocean

Janout

Hölemann

Waite

et al. 2016

Geophysical Research Letters

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Two full‐year mooring records of sea‐ice, physical, and bio‐optical parameters illuminate tight temporal coupling between the retreating seasonal ice edge and the summer phytoplankton bloom on the Laptev Sea shelf. Our records showed no sign of pelagic under‐ice blooms despite available nutrients and thinning sea ice in early summer, presumably because stratification had not yet developed. Chlorophyll blooms were detected immediately after the ice retreated in late May 2014 and late July 2015. Despite radically different timing, the blooms were similar in both magnitude and length, interpreted as community‐level nutrient limitation. Acoustic backscatter records suggest the delayed 2015 bloom resulted in lower zooplankton abundance, perhaps due to a timing mismatch between ice algal and pelagic blooms and unfavorable thermal conditions. Our observations provide classical examples of ice‐edge blooms and further emphasize the complexity of high‐latitude shelves and the need to understand vertical mixing processes important for stratification and nutrient fluxes.

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Correlation of river water and local sea‐ice melting on the Laptev Sea shelf (Siberian Arctic)

et al. 2013

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[1] Hydrographic and stable isotope (d 18 O) data from four summer surveys in the Laptev Sea are used to derive fractions of sea-ice meltwater and river water. Sea-ice meltwater fractions are found to be correlated to river water fractions. While initial heat of river discharge is too small to melt the observed 0-158 km 3 of sea-ice meltwater, arctic rivers contain suspended particles and colored dissolved organic material that preferentially absorb solar radiation. Accordingly, heat content in surface waters is correlated to river water fractions. But in years when river water is largely absent within the surface layer, absolute heat content values increase to considerably higher values with extended exposure time to solar radiation and sensible heat. Nevertheless, no net sea-ice melting is observed on the shelf in years when river water is largely absent within the surface layer. The total freshwater volume of the central-eastern Laptev Sea (72-76 N, 122-140 E) varies betweeñ 1000 and 1500 km 3 (34.92 reference salinity). It is dominated by varying river water volumes (~1300-1800 km 3 ) reduced by an about constant freshwater deficit (~350-400 km 3 ) related to sea-ice formation. Net sea-ice melt (~109-158 km 3 ) is only present in years with high river water budgets. Intermediate to bottom layer (>25 salinities) contaiñ 60% and 30% of the river budget in years with low and high river budgets, respectively. The average mean residence time of shelf waters was~2-3 years during

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Sea ice circulation in the Laptev Sea and ice export to the Arctic Ocean: Results from satellite remote sensing and numerical modeling

Abstract: Abstract. Sea ice circulation in the Laptev

Cited by 40 publications

References 22 publications

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

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

Sea‐ice retreat controls timing of summer plankton blooms in the Eastern Arctic Ocean

Correlation of river water and local sea‐ice melting on the Laptev Sea shelf (Siberian Arctic)

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