Wind‐driven summer surface hydrography of the eastern Siberian shelf

Dmitrenko, Igor; Kirillov, Sergey; Eicken, Hajo; Markova, N. V.

doi:10.1029/2005gl023022

Cited by 74 publications

(127 citation statements)

References 10 publications

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“…An outflow of brine-enriched bottom waters from the Laptev Sea has been described at about 30-50 m water depth and about 30 to 32 salinity (Bauch et al, 2009). Also, it has been inferred that the release of shelf waters occurs preferably in years with cyclonic atmospheric wind forcing (Guay et al, 2001;Dmitrenko et al, 2005) and may be rather rapid under certain local wind patterns (Bauch et al, 2011). A pulse of shelf waters was observed at the Laptev Sea continental margin in 2005 related to pronounced off-shore winds, while a similar signal was absent in summer 2006 (Bauch et al, 2011).…”

Section: Central Arctic Ocean F R / F Imentioning

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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Section: Central Arctic Ocean F R / F Imentioning

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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“…In summer 2007 "onshore" atmospheric conditions prevailed in the Laotev Sea (Bauch et al, 2010). Such an "onshore" scenario forced by the prevailing wind patterns causes Eurasian river runoff from the Laptev Sea to flow preferably eastwards into the East Siberian Sea instead of leaving the shelf northwards (Guay et al, 2001;Dmitrenko et al, 2005;Zhang et al, 2008;Bauch et al, 2009Bauch et al, , 2011b. In the East Siberian Sea these waters may mix with local shelf waters and Pacific water from the Bering Strait.…”

Section: Balancing the Fresh Water Fraction In The Upper Water Columnmentioning

confidence: 99%

Utility of dissolved barium in distinguishing North American from Eurasian runoff in the Arctic Ocean

et al. 2012

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Dissolved barium has been shown to have the potential to distinguish Eurasian from North American (NA) river runoff. As part of the ARK-XXII/2 Polarstern expedition in summer 2007, Ba was analyzed in the Barents, Kara, Laptev seas, and the Eurasian Basins as well as the Makarov Basin up to the Alpha and Mendeleyev Ridges. By combining salinity, δ 18 O and initial phosphate corrected for mineralization with oxygen (PO 4 *) or N/P ratios we identified the water mass fractions of meteoric water, sea ice meltwater, and marine waters of Atlantic as well as Pacific origin in the upper water column. In all basins inside the lower halocline layer and the Arctic intermediate waters we find Ba concentrations close to those of the Fram Strait branch of the lower halocline (41-45 nM), reflecting the composition of the incoming Atlantic water. A layer of upper halocline water (UHW) with higher Ba concentrations (45-55 nM) is identified in the Makarov Basin. Atop of the UHW, the Surface Mixed Layer (SML), including the summer and winter mixed layers, has high concentrations of Ba (58-67 nM). In the SML of the investigated area of the central Arctic the meteoric fraction can be identified by assuming a conservative behavior of Ba to be primarily of Eurasian river origin. However, in productive coastal regions biological removal compromises the use of Ba to distinguish between Eurasian and NA rivers. As a consequence, the NA river water fraction is underestimated in productive surface waters or waters that have passed a productive region, whereas this fraction is overestimated in subsurface waters containing remineralised Ba, particularly when these waters have passed productive shelf regions. Especially in the Laptev Sea and small regions in the Barents Sea, Ba concentrations are low in surface waters. In the Laptev Sea exceptionally high Ba concentrations in shelf bottom waters indicate that Ba is removed from surface waters to deep waters by biological activity enhanced by increasing ice-free conditions as well as by scavenging by organic matter of terrestrial origin. We interpret high Ba concentrations in the UHW of the Makarov Basin to result from enrichment by remineralisation in bottom waters on the shelf of the Chukchi Sea and therefore the calculated NA runoff is an artefact. We conclude that no NA runoff can be demonstrated unequivocally anywhere during our expedition with the set of tracers considered here. Small contributions of NA runoff may have been masked by Ba depletion and could only be resolved by supportive tracers on the uptake history. We thus suggest that Ba has to be used with care as it can put limits but not yield quantitative water mass distributions. Only if the extra Ba inputs exceed the cumulative biological uptake the signal can be unequivocally attributed to NA runoff.

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“…Wegner et al, 2005). The spatial distribution of the Lena River freshwater plume shows a strong interannual variability, mainly associated with positive and negative phases of atmospheric vorticity over the adjacent Arctic Ocean in summer (Guay et al, 2001;Dmitrenko et al, 2005;Bauch et al, 2009). The vorticity index is defined by Walsh et al (1996): During a negative phase, when the mean summer atmospheric circulation is predominantly anticyclonic, the freshwater plume spreads northwards onto the Laptev Sea shelf (Dmitrenko et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

et al. 2013

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Sediment transport dynamics were studied during ice-free conditions under different atmospheric circulation regimes on the Laptev Sea shelf (Siberian Arctic). To study the interannual variability of suspended particulate matter (SPM) dynamics and their coupling with the variability in surface river water distribution on the Laptev Sea shelf, detailed oceanographic, optical (turbidity and Ocean Color satellite data), and hydrochemical (nutrients, SPM, stable oxygen isotopes) process studies were carried out continuously during the summers of 2007 and 2008. Thus, for the first time SPM and nutrient variations on the Laptev Sea shelf under different atmospheric forcing and the implications for the turbidity and transparency of the water column can be presented. <br><br> The data indicate a clear link between different surface distributions of riverine waters and the SPM transport dynamics within the entire water column. The summer of 2007 was dominated by shoreward winds and an eastward transport of riverine surface waters. The surface SPM concentration on the southeastern inner shelf was elevated, which led to decreased transmissivity and increased light absorption. Surface SPM concentrations in the central and northern Laptev Sea were comparatively low. However, the SPM transport and concentration within the bottom nepheloid layer increased considerably on the entire eastern shelf. The summer of 2008 was dominated by offshore winds and northward transport of the river plume. The surface SPM transport was enhanced and extended onto the mid-shelf, whereas the bottom SPM transport and concentration was diminished. This study suggests that the SPM concentration and transport, in both the surface and bottom nepheloid layers, are associated with the distribution of riverine surface waters which are linked to the atmospheric circulation patterns over the Laptev Sea and the adjacent Arctic Ocean during the open water season. A continuing trend toward shoreward winds, weaker stratification and higher SPM concentration throughout the water column might have severe consequences for the ecosystem on the Laptev Sea shelf

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Wind‐driven summer surface hydrography of the eastern Siberian shelf

Cited by 74 publications

References 10 publications

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

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

Utility of dissolved barium in distinguishing North American from Eurasian runoff in the Arctic Ocean

Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

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