Exchange of Laptev Sea and Arctic Ocean halocline waters in response to atmospheric forcing

Bauch, Dorothea; Dmitrenko, Igor; Wegner, Carolyn; Hölemann, Jens; Kirillov, Sergey; Timokhov, Leonid; Kassens, Heidemarie

doi:10.1029/2008jc005062

Cited by 83 publications

(106 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 at f r of 30% and f i of -16%). This is in agreement with a bathymetry-steered export of Laptev Sea bottom water at the north-eastern border of the Laptev Sea (Bauch et al, 2009) and is also in accordance with a shift in freshwater storage between the Laptev and the East Siberian seas (Dmitrenko et al, 2008). This layer may also be formed in the East Siberian Sea, but if so the f i / f r signature and salinity would be identical to that of the south-eastern Laptev Sea waters; therefore it is not discussed separately here.…”

Section: New Siberian Islands and East Siberian Sea F R / F Isupporting

confidence: 89%

“…Therefore bottom waters from the Kara and Laptev shelf areas with enhanced influence of local polynya activity had a salinity of about 30 (Bauch et al, 2005), compared to a salinity of about 32 in bottom waters of the Laptev Sea, which had a reduced imprint of local polynya activity (Bauch et al, 2010). The spatial distribution of river water on the Siberian shelves shows strong gradients and interannual variations within the surface layer (Bauch et al, 2009). …”

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

confidence: 99%

See 1 more Smart Citation

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

Bauch

Loeff

Andersen

et al. 2011

Progress in Oceanography

189

View full text Add to dashboard Cite

Section: New Siberian Islands and East Siberian Sea F R / F Isupporting

confidence: 89%

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

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

View full text Add to dashboard Cite

“…Observations of dissolved Barium in 1998(Taylor et al, 2003 The covariation of MW and FIFB section transports and inventories (Sect. 3.2.5) may be due to formation processes on the Siberian shelves (Bauch et al, 2009(Bauch et al, , 2011a. Within the Transpolar Drift, Jones et al (2008a) observed IFB patches at depths below 50 m in the Eurasian Basin, vertically isolated from the much shallower summer surface mixed layer.…”

Section: Changes In the Arctic Ocean Basinsmentioning

confidence: 96%

“…Regional ice formation processes also have a strong influence on freshwater inventories by the release of subsurface brine maxima (e.g. Bauch et al, 2009Bauch et al, , 2011a from the shelves into the Arctic basins. These brine maxima have been observed to persist within the Transpolar Drift (e.g.…”

Section: Tracers and Freshwater In The Arctic Oceanmentioning

confidence: 99%

Liquid export of Arctic freshwater components through the Fram Strait 1998–2011

et al. 2013

View full text Add to dashboard Cite

Abstract. We estimated the magnitude and composition of southward liquid freshwater transports in the East Greenland Current near 79 • N in the Western Fram Strait between 1998 and 2011. Previous studies have found this region to be an important pathway for liquid freshwater export from the Arctic Ocean to the Nordic Seas and the North Atlantic subpolar gyre.Our transport estimates are based on six hydrographic surveys between June and September and concurrent data from moored current meters. We combined concentrations of liquid freshwater, meteoric water (river water and precipitation), sea ice melt and brine from sea ice formation, and Pacific Water, presented in Dodd et al. (2012), with volume transport estimates from an inverse model. The average of the monthly snapshots of southward liquid freshwater transports between 10.6 • W and 4 • E is 100 ± 23 mSv (3160 ± 730 km 3 yr −1 ), relative to a salinity of 34.9. This liquid freshwater transport consists of about 130 % water from rivers and precipitation (meteoric water), 30 % freshwater from the Pacific, and −60 % (freshwater deficit) due to a mixture of sea ice melt and brine from sea ice formation.Pacific Water transports showed the highest variation in time, effectively vanishing in some of the surveys. Comparison of our results to the literature indicates that this was due to atmospherically driven variability in the advection of Pacific Water along different pathways through the Arctic Ocean. Variations in most liquid freshwater component transports appear to have been most strongly influenced by changes in the advection of these water masses to the Fram Strait. However, the local dynamics represented by the volume transports influenced the liquid freshwater component transports in individual years, in particular those of sea ice melt and brine from sea ice formation.Our results show a similar ratio of the transports of meteoric water and net sea ice melt as previous studies.

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Exchange of Laptev Sea and Arctic Ocean halocline waters in response to atmospheric forcing

Cited by 83 publications

References 32 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

Liquid export of Arctic freshwater components through the Fram Strait 1998–2011

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

Contact Info

Product

Resources

About