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  • 1
    Online Resource
    Online Resource
    The Arctic Basin : Results from the Russian Drifting Stations. (2005)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Drifting ice stations -- Arctic Ocean. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (307 pages)
    Edition: 1st ed.
    ISBN: 9783540376651
    Series Statement: Springer Praxis Bks.
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=304164
    Language: English
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  • 2
    Online Resource
    Online Resource
    Land-Ocean Systems in the Siberian Arctic : Dynamics and History. (1999)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Physical geography-Russia (Federation)-Laptev Sea Region. ; Marine ecology-Russia (Federation)-Laptev Sea. ; Ecology-Russia (Federation)-Laptev Sea Region. ; Laptev Sea (Russia). ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (695 pages)
    Edition: 1st ed.
    ISBN: 9783642601347
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6488717
    DDC: 555.7
    Language: English
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  • 3
    Online Resource
    Online Resource
    Seasonal modification of the Arctic Ocean intermediate water layer off the eastern Laptev Sea continental shelf break (2009)
    Associated volumes
    Details Availability
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 114(2009), 6, 2169-9291
    In: volume:114
    In: year:2009
    In: number:6
    In: extent:19
    Description / Table of Contents: Through the analysis of observational mooring data collected at the northeastern Laptev Sea continental slope in 2004-2007, we document a hydrographic seasonal signal in the intermediate Atlantic Water (AW) layer, with generally higher temperature and salinity from December-January to May-July and lower values from May-July to December-January. At the mooring position, this seasonal signal dominates, contributing up to 75% of the total variance. Our data suggest that the entire AW layer down to at least 840 m is affected by seasonal cycling, although the strength of the seasonal signal in temperature and salinity reduces from 260 m (±0.25ʿC and ±0.025 psu) to 840 m (±0.05ʿC and ±0.005 psu). The seasonal velocity signal is substantially weaker, strongly masked by high-frequency variability, and lags the thermohaline cycle by 45-75 days. We hypothesize that our mooring record shows a time history of the along-margin propagation of the AW seasonal signal carried downstream by the AW boundary current. Our analysis suggests that the seasonal signal in the Fram Strait Branch of AW (FSBW) at 260 m is predominantly translated from Fram Strait, while the seasonality in the Barents Sea branch of AW (BSBW) domain (at 840 m) is attributed instead to the seasonal signal input from the Barents Sea. However, the characteristic signature of the BSBW seasonal dynamics observed through the entire AW layer leads us to speculate that BSBW also plays a role in seasonally modifying the properties of the FSBW.
    Type of Medium: Online Resource
    Pages: 19 , graph. Darst
    ISSN: 2169-9291
    URL: http://onlinelibrary.wiley.com/enhanced/doi/10.1029/2008JC005229/
    DOI: 10.1029/2008JC005229
    Language: English
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  • 4
    Online Resource
    Online Resource
    Barents Sea upstream events impact the properties of Atlantic water inflow into the Arctic Ocean : evidence from 2005 to 2006 downstream observations (2009)
    Associated volumes
    Details Availability
    In: Deep-sea research. Part 1, Oceanographic research papers, Amsterdam [u.a.] : Elsevier Science, 1993, 56(2009), 4, Seite 513-527, 1879-0119
    In: volume:56
    In: year:2009
    In: number:4
    In: pages:513-527
    Description / Table of Contents: Inflow of Atlantic water (AW) from Fram Strait and the Barents Sea into the Arctic Ocean conditions the intermediate (100-1000 m) waters of the Arctic Ocean Eurasian margins. While over the Siberian margin the Fram Strait AW branch (FSBW) has exhibited continuous dramatic warming beginning in 2004, the tendency of the Barents Sea AW branch (BSBW) has remained poorly known. Here we document the contrary cooling tendency of the BSBW through the analysis of observational data collected from the icebreaker Kapitan Dranitsyn over the continental slope of the Eurasian Basin in 2005 and 2006. The CTD data from the R.V. Polarstern cruise in 1995 were used as a reference point for evaluating external atmospheric and sea-ice forcing and oxygen isotope analysis. Our data show that in 2006 the BSBW core was saltier (by ~0.037), cooler (~0.41 ʿC), denser (by ~0.04 kg/m3), deeper (by 150-200 m), and relatively better ventilated (by 78 mymol/kg of dissolved oxygen, or by 1.11.7% of saturation) compared with 2005. We hypothesize that the shift of the meridional wind from off-shore to on-shore direction during the BSBW translation through the Barents and northern Kara seas results in longer surface residence time for the BSBW sampled in 2006 compared with samples from 2005. The cooler, more saline, and better-ventilated BSBW sampled in 2006 may result from longer upstream translation through the Barents and northern Kara seas where the BSBW was modified by sea-ice formation and interaction with atmosphere. The data for stable oxygen isotopes from 1995 and 2006 reveals amplified brine modification of the BSBW core sampled downstream in 2006, which supports the assumption of an increased upstream residence time as indicated by wind patterns and dissolved oxygen values.
    Type of Medium: Online Resource
    Pages: graph. Darst
    ISSN: 1879-0119
    DOI: 10.1016/j.dsr.2008.11.005
    Language: English
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  • 5
    Online Resource
    Online Resource
    Toward a warmer Arctic Ocean : spreading of the early 21st century Atlantic water warm anomaly along the Eurasian Basin margins (2008)
    Associated volumes
    Details Availability
    In: Journal of geophysical research. C, Oceans, Hoboken, NJ : Wiley, 1978, 113(2008), 2169-9291
    In: volume:113
    In: year:2008
    In: extent:13
    Description / Table of Contents: We document through the analysis of 2002-2005 observational data the recent Atlantic Water (AW) warming along the Siberian continental margin due to several AW warm impulses that penetrated into the Arctic Ocean through Fram Strait in 1999-2000. The AW temperature record from our long-term monitoring site in the northern Laptev Sea shows several events of rapid AW temperature increase totaling 0.8ʿC in FebruaryAugust 2004. We hypothesize the along-margin spreading of this warmer anomaly has disrupted the downstream thermal equilibrium of the late 1990s to earlier 2000s. The anomaly mean velocity of 2.4-2.5 ± 0.2 cm/s was obtained on the basis of travel time required between the northern Laptev Sea and two anomaly fronts delineated over the Eurasian flank of the Lomonosov Ridge by comparing the 2005 snapshot along-margin data with the AW pre-1990 mean. The magnitude of delineated anomalies exceeds the level of pre-1990 mean along-margin cooling and rises above the level of noise attributed to shifting of the AW jet across the basin margins. The anomaly mean velocity estimation is confirmed by comparing mooring-derived AW temperature time series from 2002 to 2005 with the downstream along-margin AW temperature distribution from 2005. Our mooring current meter data corroborate these estimations.
    Type of Medium: Online Resource
    Pages: 13 , graph. Darst
    ISSN: 2169-9291
    DOI: 10.1029/2007JC004158
    Language: English
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  • 6
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    One more step toward a warmer Arctic (2005)
    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 32 (17). L17605.
    Details
    Publication Date: 2015-03-10
    Description: This study was motivated by a strong warming signal seen in mooring-based and oceanographic survey data collected in 2004 in the Eurasian Basin of the Arctic Ocean. The source of this and earlier Arctic Ocean changes lies in interactions between polar and sub-polar basins. Evidence suggests such changes are abrupt, or pulse-like, taking the form of propagating anomalies that can be traced to higher-latitudes. For example, an anomaly found in 2004 in the eastern Eurasian Basin took ∼1.5 years to propagate from the Norwegian Sea to the Fram Strait region, and additional ∼4.5–5 years to reach the Laptev Sea slope. While the causes of the observed changes will require further investigation, our conclusions are consistent with prevailing ideas suggesting the Arctic Ocean is in transition towards a new, warmer state.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2005GL023740
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  • 7
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    Correlation of river water and local sea-ice melting on the Laptev Sea shelf (Siberian Arctic) (2013)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 118 (1). pp. 550-561.
    Details
    Publication Date: 2019-09-23
    Description: Hydrographic and stable isotope (δ18O) data from 4 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 km3 of sea-ice meltwater, arctic rivers contain suspended particles (SPM) and colored dissolved organic material (CDOM) 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 between ~1000-1500 km3 (34.92 reference salinity). It is dominated by varying river water volumes (~1300-1800 km3) reduced by an about constant freshwater deficit (~350-400 km3) related to sea-ice formation. Net sea-ice melt (~109-158 km3) is only present in years with high river water budgets. Intermediate to bottom layer (〉25 salinities) contain ~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 2007-2009.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1002/jgrc.20076
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  • 8
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    Interannual variations in river water content and distribution over the Laptev Sea between 2007 and 2011: The Arctic Dipole connection (2014)
    AGU (American Geophysical Union) | Wiley
    In:  Geophysical Research Letters, 41 (20). pp. 7237-7244.
    Details
    Publication Date: 2017-04-10
    Description: Five years of oxygen isotope and hydrological surveys reveal interannual variations in the inventory and distribution of river water over the Laptev Sea. In 2007, 2009, and 2010 relatively low amounts of river water (≤1500 km3) were found and were mostly located in the southeastern Laptev Sea. In 2008 and 2011, high amounts of river water (~1600 km3 and ~2000 km3) were found, especially in the central and northern part of the shelf, suggesting a northward export of this water. This temporal pattern is coherent with the summer Arctic Dipole index that was higher in 2008 and 2011. Our results suggest that the Arctic Dipole might influence the export of river water from the Laptev Sea. Moreover, the river water inventory in the Laptev Sea seems related to the freshwater content of the Arctic Ocean with a 2 years lag.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2014GL061814
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  • 9
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    Multidecadal variability in the Arctic/North Atlantic climate system (2006)
    In:  [Poster] In: 2006 Annual Meeting and Arctic Forum - ARCUS, 25.05.-26.05.2006, Washington, DC, USA .
    Details
    Publication Date: 2020-10-16
    Description: Over the last several decades, the Arctic and North Atlantic have undergone substantial changes. Enhanced transport of warmer air from lower latitudes led to increased arctic surface air temperature associated with decreased arctic sea-level pressure and increased polar atmospheric cyclonicity which led to reductions in arctic ice extent and a decrease of ice thickness. Changes in the Arctic Ocean are also significant. Positive temperature anomalies in the intermediate Atlantic Water (AW) layer of the Arctic Ocean were found in the 1990s and 2000s. Freshwater content in the upper layer of the Arctic Ocean was also reduced dramatically over the recent decades. Concurrent with these high-latitude changes are North Atlantic warming and salinification in the upper 300 m layer (except the subpolar North Atlantic) and widespread cooling and freshening in the 1000-3000 m layer. We suggest that both long-term climate trend and low-frequency variability play a substantial role in shaping these recent changes in the Arctic/North Atlantic climate system. Understanding the key factors influencing the Arctic/North Atlantic multi-decadal variability may provide a reasonable means for developing climatic forecasts of widespread persistent anomalies. Xiangdong
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 10
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    Distribution and circulation of Pacific Winter and Summer Waters in the Arctic Ocean based on historical data (2006)
    In:  [Poster] In: EGU General Assembly 2006, 02.04.-07.04.2006, Vienna, Austria .
    Details
    Publication Date: 2015-04-28
    Description: Due to hydrostatic imbalance, water from the North Pacific flows through the Bering Strait, transits the upper levels of the Arctic Ocean, and finds its way to the North Atlantic. Waters recently originating from the North Pacific generally have a distinct temperature, salinity, and silicate signature. Summer and winter modification produces two forms of Pacific-origin water that comprise the upper and middle halocline of the upper layer, respectively. Using hydrographic and hydrochemical data (1950 - 1993), annual wintertime fields are estimated and used to delineate the boundary between the halocline of predominately Atlantic Water from the halocline of predominately Pacific Water. The horizontal extent of Pacific Winter Water is often sharply defined by a strong gradient in silicate. Examinations of the hydrographic/hydrochemical fields also suggest that temperature on the 33.1 psu isopycnal can also be used to estimate the boundary between halocline waters. We determined that the boundary lies at the intersection of 33.1 psu isohaline and -1.6oC isotherm. The interannual and decadal positions of the boundary are illustrated. Finally, we show data of the vertical and horizontal structure of the interface between the two haloclines. During summer and early fall, much of the Chukchi Shelf is ice free and surface waters are found to be several degrees above the freezing temperatures. This warm water flows off the shelf and subsides beneath the fresher surface water of the Canadian Basin. In subsequent winters, remnants of this warm shelf water can be identified by a slight temperature maximum, greater than -1.4oC, in the upper halocline. Data collected during the “Sever” (and other) expeditions are analyzed to determine the extent of this Pacific Summer Water (PSW). Annual spatial patterns of maximum temperature and thickness of the PSW are shown for selected years. Summaries of volume and heat content are estimated. The transport of PSW is reconciled with patterns of geostrophiclly balanced flow in the upper halocline off the Beaufort and Chukchi Seas. We show time series of water volume and heat content of PSW with comparison to indexes of atmospheric circulation. Finally, we calculated the circulation of Pacific Water in the Arctic Ocean based on a model of Bernoulli equations.
    Type: Conference or Workshop Item , NonPeerReviewed
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