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

Bauch, Dorothea; Hölemann, Jens; Nikulina, Anna; Wegner, Carolyn; Janout, Markus; Timokhov, Leonid; Kassens, Heidemarie

doi:10.1002/jgrc.20076

Cited by 58 publications

(67 citation statements)

References 56 publications

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“…In agreement with our result, Zhang et al [32] observed an increased moisture transport into the Eurasian river basins, and Shiklomanov and Lammers [50] described a peak river discharge in 2007. Some authors have suggested a link between increased Eurasian river discharge and sea ice decline [25,26]. This relationship is in accordance with our own results, given the important sea ice retreat that occurred to the north of the main Eurasian Arctic river estuaries in 2006/2007 (Figure 1).…”

Section: Discussionsupporting

confidence: 92%

“…The recent change in the perennial sea ice [22,23] is considered one of the most important reasons for the decrease in sea ice volume by several authors. However, variations in the hydrological cycle can affect sea ice too, and in some reports the reduction in sea ice has been related to increased river discharge [24][25][26] or storm activity [27,28]. Atmospheric moisture transport has an important role in sea ice extent variations.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have discussed the recent increase in river discharge over the Arctic (e.g., [33,34]), and it was determined that the river discharge has an influence over the Arctic system in different ways [24]. Although its influence on sea ice extent remains unclear, several studies have suggested a link between river runoff and summer ice melt or early freezing [25,26,35].…”

Section: Introductionmentioning

confidence: 99%

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Extreme Sea Ice Loss over the Arctic: An Analysis Based on Anomalous Moisture Transport

2017

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Abstract:The Arctic system has experienced in recent times an extreme reduction in the extent of its sea ice. The years 2007 and 2012 in particular showed maxima in the loss of sea ice. It has been suggested that such a rapid decrease has important implications for climate not only over the system itself but also globally. Understanding the causes of this sea ice loss is key to analysing how future changes related to climate change can affect the Arctic system. For this purpose, we applied the Lagrangian FLEXible PARTicle dispersion (FLEXPART) model to study the anomalous transport of moisture for 2006/2007 and 2011/2012 in order to assess the implications for the sea ice. We used the model results to analyse the variation in the sources of moisture for the system (backward analysis), as well as how the moisture supply from these sources differs (forward analysis) during these years. The results indicate an anomalous transport of moisture for both years. However, the pattern differs between events, and the anomalous moisture supply varies both in intensity and spatial distribution for all sources.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extreme Sea Ice Loss over the Arctic: An Analysis Based on Anomalous Moisture Transport

2017

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“…Dmitrenko et al, 2010). Given that the negative SIM signal on the Laptev Sea is -to a large extent -the result of winter sea-ice formation within the coastal polynyas, the shelf waters containing a negative SIM signal at salinity of 30 to 32 found at ∼ 30 m water depth are fed by bottom waters in the central Laptev Sea (Bauch et al, 2012.…”

Section: Laptev Sea Sim Signal and F Sim /F R Signaturementioning

confidence: 99%

Halocline water modification and along-slope advection at the Laptev Sea continental margin

et al. 2014

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Abstract.A general pattern in water mass distribution and potential shelf-basin exchange is revealed at the Laptev Sea continental slope based on hydrochemical and stable oxygen isotope data from the summers [2005][2006][2007][2008][2009]. Despite considerable interannual variations, a frontal system can be inferred between shelf, continental slope and central Eurasian Basin waters in the upper 100 m of the water column along the continental slope. Net sea-ice melt is consistently found at the continental slope. However, the sea-ice meltwater signal is independent from the local retreat of the ice cover and appears to be advected from upwind locations.In addition to the along-slope frontal system at the continental shelf break, a strong gradient is identified on the Laptev Sea shelf between 122 • E and 126 • E with an eastward increase of riverine and sea-ice related brine water contents. These waters cross the shelf break at ∼ 140 • E and feed the low-salinity halocline water (LSHW, salinity S < 33) in the upper 50 m of the water column. High silicate concentrations in Laptev Sea bottom waters may lead to speculation about a link to the local silicate maximum found within the salinity range of ∼ 33 to 34.5, typical for the Lower Halocline Water (LHW) at the continental slope. However brine signatures and nutrient ratios from the central Laptev Sea differ from those observed at the continental slope. Thus a significant contribution of Laptev Sea bottom waters to the LHW at the continental slope can be excluded. The silicate maximum within the LHW at the continental slope may be formed locally or at the outer Laptev Sea shelf. Similar to the advection of the sea-ice melt signal along the Laptev Sea continental slope, the nutrient signal at 50-70 m water depth within the LHW might also be fed by advection parallel to the slope. Thus, our analyses suggest that advective processes from upstream locations play a significant role in the halocline formation in the northern Laptev Sea.

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“…Sampling procedure and data analysis are described in detail by Bauch et al (2010Bauch et al ( , 2013. The combined interpretation of δ 18 O composition of the water and salinity allows for the quantification of the different freshwater contributions in polar regions, i.e.…”

Section: Riverine Fraction Of Sea Watermentioning

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

Cited by 58 publications

References 56 publications

Extreme Sea Ice Loss over the Arctic: An Analysis Based on Anomalous Moisture Transport

Extreme Sea Ice Loss over the Arctic: An Analysis Based on Anomalous Moisture Transport

Halocline water modification and along-slope advection at the Laptev Sea continental margin

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

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