Confluence and redistribution of Atlantic water in the Nansen, Amundsen and Makarov basins

Schauer, Ursula; Rudels, Bert; Jones, E. P.; Anderson, Leif G.; Muench, Robin D.; Björk, Göran; Swift, James H.; Ivanov, Vladimir; Larsson, Anna-Maria

doi:10.5194/angeo-20-257-2002

Cited by 130 publications

(186 citation statements)

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“…This is certainly not true. Both eddies, likely caused by baroclinic instability at the confluence of the two branches (Schauer et al, 2002a), as well as interleaving and consecutive doublediffusive fluxes (Rudels et al, 1999) have been shown to exchange water between the branches and to reduce the respective extremes of temperature and salinity. Since Barents Sea water has been cooled to less than 0 • C when it encounters the Fram Strait branch in the northern Kara Sea our approach might overestimate the heat transport divergence if it captures cold Barents Sea water in the outflow part of the assumed stream tube instead of warmer Fram Strait Water which is returning further west.…”

Section: Discussion Of Inherent Uncertaintiesmentioning

confidence: 99%

“…There is no indication that the Barents Sea branch that enters the central Arctic Ocean through the St. Anna Trough crosses any of the WSC-derived loops. Rudels et al (1994) and Schauer et al (2002a) showed that the Barents Sea water displaces the Fram Strait branch off the slope at the confluence of the two branches in the northern Kara Sea and that further downstream the two branches run parallel with the Barents sea branch at the slope side and the Fram Strait branch flowing at the basin side (Fig. 1).…”

Section: A Stream Tube Concept For the West Spitsbergen Currentmentioning

confidence: 99%

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Problems with estimation and interpretation of oceanic heat transport – conceptual remarks for the case of Fram Strait in the Arctic Ocean

Schauer

Beszczynska-Möller²

2009

Ocean Sci.

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Abstract. While the concept of oceanic heat transport -or rather heat transport divergence -is well known, it is sometimes applied inaccurately. Often so-called "heat transports" are computed across a partial section which means that the volume flow through such a section is not zero. In this case the "heat transports" depend entirely on the choice of the temperature scale. The consequences of such arbitrariness are demonstrated with a simple calculation exercise for the passages to the Arctic Ocean. To circumvent the arising difficulties for the Fram Strait in the Arctic we propose a stream tube concept to define a net zero volume flow section which can, with coarse assumptions, be used to determine oceanic heat transport by the portion of Atlantic water flow that passes through Fram Strait. Weaknesses of this approach and consequences for observational strategies are discussed.

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Section: Discussion Of Inherent Uncertaintiesmentioning

confidence: 99%

Section: A Stream Tube Concept For the West Spitsbergen Currentmentioning

confidence: 99%

Problems with estimation and interpretation of oceanic heat transport – conceptual remarks for the case of Fram Strait in the Arctic Ocean

Schauer

Beszczynska-Möller²

2009

Ocean Sci.

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“…[3] Several papers have proposed schemes for the Atlantic water pathway [e.g., Rudels et al, 1994;Schauer et al, 2002] that cyclonically follow the shelf slope and midocean ridge margins of the major basins, but many important features are uncertain (Figure 1). One of the Atlantic water gyres is in the Amundsen Basin (AB) with flow along the Russian continental slope and returning towards Greenland along the AB flank of the Lomonosov Ridge (LR).…”

Section: Introductionmentioning

confidence: 99%

Temperature difference across the Lomonosov Ridge: Implications for the Atlantic Water circulation in the Arctic Ocean

Kikuchi

Inoue

Morison

2005

Geophysical Research Letters

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Drifting buoy observations in the Arctic Ocean indicate that, unlike climatological conditions, the temperature of the upper Atlantic water was higher in the Makarov Basin side of the Lomonosov Ridge than in the Amundsen Basin side in 2004. Hydrographic data from 1991 to 2004 has been compared with climatology to examine the relative phase of Atlantic water temperature change in these regions. On the Amundsen Basin side of the Lomonosov Ridge, a positive temperature anomaly in the Atlantic water began in the early 1990s, continued from the mid‐1990s to the early 2000s and started decreasing in 2004. In contrast, positive temperature anomalies were first apparent on the Makarov Basin side of the Lomonosov Ridge in 2000, and continue in 2004. Recent historical data indicates that the arrival of temperature anomalies on the Makarov Basin side of the Lomonosov Ridge is delayed about 7 years after arrival on the Amundsen Basin side. Our results support the idea that Atlantic Water circulates cyclonically around the periphery of the Makarov basin at a propagation speed of 1–2 cm s−1.

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“…The temperature and heat content in the AW layer is influenced by both the warm Fram Strait and the cold BSO AW branches, the latter of which joins the former mainly through the St. Anna Trough (Schauer et al, 2002). Using passive tracers we can 15 obtain the spatial distribution of the two water sources (Fig.…”

Section: Atlantic Water (A) Heat Content and Water Mass Sourcesmentioning

confidence: 99%

“…The warmer Fram Strait branch and colder BSO branch converge north of the Kara Sea (Schauer et al, 2002;Karcher and Oberhuber, 2002;Maslowski et al, 2004) and con-5 tinue eastward along the Eurasian slope. After passing the Laptev Sea slope, the boundary current bifurcates into one branch following the Lomonosov Ridge and another following the continental slope (Woodgate et al, 2001).…”

Section: Model Setupmentioning

confidence: 99%

A 4.5 km resolution Arctic Ocean simulation with the global multi-resolution model FESOM1.4

Wang¹,

Wekerle²,

Danilov³

et al. 2017

Preprint

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Abstract. In the framework of developing a global modeling system which can facilitate modeling studies on Arctic Ocean and high-mid latitude linkage, we evaluate the Arctic Ocean simulated by the multi-resolution ocean sea-ice model FESOM.To explore the value of using high horizontal resolution for Arctic Ocean modeling, we use two global meshes differing in Atlantic Water (AW) mean state and variability. The deepening and thickening bias of the AW layer, a common issue found in coarse resolution simulations, is significantly alleviated by using higher resolution. The topographic steering of the AW is stronger and the seasonal and interannual temperature variability along the ocean bottom topography is enhanced in the high resolution simulation. The high resolution also improves the ocean surface circulation, mainly through a better representation of the narrow straits in the Canadian Arctic Archipelago (CAA). The representation of CAA throughflow not only influences 10 the release of water masses through the other gateways, but also the circulation pathways inside the Arctic Ocean. However, the mean state and variability of Arctic freshwater content and the variability of freshwater transport through the Arctic gateways appear not to be very sensitive to the increase in resolution employed here. We also discuss model issues that are not directly linked to resolution, highlighting the need for further model development including improving parameterizations.

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Confluence and redistribution of Atlantic water in the Nansen, Amundsen and Makarov basins

Abstract: Abstract. The waters in the Eurasian Basin are conditioned by the confluence of the boundary flow of warm, saline Fram

Cited by 130 publications

References 30 publications

Problems with estimation and interpretation of oceanic heat transport – conceptual remarks for the case of Fram Strait in the Arctic Ocean

Problems with estimation and interpretation of oceanic heat transport – conceptual remarks for the case of Fram Strait in the Arctic Ocean

Temperature difference across the Lomonosov Ridge: Implications for the Atlantic Water circulation in the Arctic Ocean

A 4.5 km resolution Arctic Ocean simulation with the global multi-resolution model FESOM1.4

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