Changes in Atlantic Water Circulation Patterns and Volume Transports North of Svalbard Over the Last 12 Years (2008–2020)

Athanase, Marylou; Provost, Christine; Artana, Camila; Pérez‐Hernández, M. Dolores; Sennéchael, Nathalie; Bertosio, Cécilia; Garric, Gilles; Lellouche, Jean‐Michel; Prandi, Pierre

doi:10.1029/2020jc016825

Cited by 19 publications

(39 citation statements)

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“…This comparison is performed with a longer time series than in Athanase et al. (2021) and leads to the same conclusions.…”

Section: Ypb In Mercator‐ocean Operational Modelsupporting

confidence: 55%

“…The YPB flow is characterized by strong intermittent flow pulses parallel to isobath of 1–2‐month duration in winter (Koenig, Provost, Sennéchael, et al., 2017). These intermittent coherent YPB pulses in winter are well reproduced in numerical models (Athanase et al., 2021; Crews et al., 2019; Koenig, Provost, Sennéchael, et al., 2017). Crews et al.…”

Section: Introductionmentioning

confidence: 57%

“…The model reproduces the observed decreasing trends in salinity and temperature. This comparison is performed with a longer time series than inAthanase et al (2021) and leads to the same conclusions.…”

mentioning

confidence: 64%

“…Changes in AW transport through the YPB are modulated by changes in the WSC transport itself and the distribution of WSC transport among the different branches (Figure 1): Svalbard Branch, YPB, YB, NB, and recirculation branches (Athanase et al., 2021). The modeled YPB constitutes the main path for AW over the Yermak Plateau with an AW volume transport largely correlated with the WSC AW transport ( r = 0.75; Athanase et al., 2021). Model suggests that the maximum in 2013/2014 can be attributed to a smaller recirculation back to Fram Strait (thus more flow through the YPB) and minima in 2015/2016 and 2017/2018 to a larger recirculation (thus less flow through the YPB; Athanase et al., 2021; their Figure 5).…”

Section: Ypb In Mercator‐ocean Operational Modelmentioning

confidence: 99%

“…10.1029/2021JC018006 3 of 22 in Figure 1) hereafter. The strengthening of the AW circulation over and around Yermak Plateau was widespread and coincided with an overall warming in the upper ocean layer (0-1,000 m; Athanase et al, 2021). As winter sea-ice retreats, the northward progression and shoaling of AW led to enhanced deep winter convection (Athanase et al, 2020).…”

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confidence: 99%

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Atlantic Water Inflow Through the Yermak Pass Branch: Evolution Since 2007

et al. 2022

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Thirty‐four months (2017–2020) of mooring data were recently obtained at 80.6°N, 7.26°E in the main branch of Atlantic Water inflow to the Arctic, the Yermak Pass Branch. The Yermak Pass Branch was sampled at that same location during 14 months a decade ago (2007–2008) when sea ice was abundant (mean sea‐ice concentration of 74% vs. 39% during the recent deployment). We focus on time scales larger than 50 hr. The new mooring data set shows an increase in the velocity variations of 40% compared to the 2007–2008 period. Year 2018 was exceptional with ice‐free conditions over the entire year and an intensified mesoscale activity compared to other years. Temperature and salinity time series at 340 m showed significant trends over 3 years (freshening of −0.07 g/kg and cooling of about −0.9°C in 3 years). The performance of 1/12° Mercator‐Ocean operational model at the mooring location was precisely assessed. The modeled Atlantic Water transport was on average larger during 2017–2020 (40% larger) than during 2007–2008. The synoptic transport time series ranged between −1 and 5 Sv over 2007–2020 and showed large seasonal and interannual variations. The transport was larger in winter than summer. However, occasionally negative transport (<−0.7 Sv) through the Yermak Pass Branch occurred during winters (“Blocking events”). These blocking events are associated with recirculations and eddy activity and were more common over the last years from 2016 onward. The model suggested that a Northern Branch crossing the Yermak Plateau further north (81.6°N) intermittently developed.

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“…This comparison is performed with a longer time series than in Athanase et al. (2021) and leads to the same conclusions.…”

Section: Ypb In Mercator‐ocean Operational Modelsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 57%

mentioning

confidence: 64%

Section: Ypb In Mercator‐ocean Operational Modelmentioning

confidence: 99%

mentioning

confidence: 99%

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Atlantic Water Inflow Through the Yermak Pass Branch: Evolution Since 2007

et al. 2022

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Exceptional sea ice loss leading to anomalously deep winter convection north of Svalbard in 2018

Fu,

Myers

2023

Clim Dyn

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An important question is will deep convection sites, where deep waters are ventilated and air-gas exchange into the deep ocean occurs, emerge in the Arctic Ocean with the warming climate. As sea ice retreats northward and as Arctic sea ice becomes younger and thinner, air-sea interactions are strengthening in the high-latitude oceans. This includes new and extreme deep convection events. We investigate the associated physical processes and examine impacts and implications. Focusing on a region near the Arctic gateway of Fram Strait, our study confirms a significant sea ice cover reduction north of Svalbard in 2018 compared to the past decade, shown in observations and several numerical studies. We conduct our study using the regional configuration Arctic and North Hemisphere Atlantic of the ocean/sea ice model NEMO, running at 1/12° resolution (ANHA12). Our numerical study shows that the open water condition during the winter of 2018 allows intense winter convection over the Yermak Plateau, as more oceanic heat is lost to the atmosphere without the insulating sea ice cover, causing the mixed layer depth to reach over 600 m. Anomalous wind prior to the deep convection event forces offshore sea ice movement and contributes to the reduced sea ice cover. The sea ice loss is also attributed to the excess heat brought by the Atlantic Water, which reaches its maximum in the preceding winter in Fram Strait. The deep convection event coincides with enhanced mesoscale eddy activity on the boundary of the Yermak Plateau, especially to the east. The resulting substantial heat loss to the atmosphere also leads to a heat content reduction integrated over the Yermak Plateau region. This event can be linked to the minimum southward sea ice volume flux through Fram Strait in 2018, which is a potential negative freshwater anomaly in the subpolar Atlantic.

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Ocean Circulation from Space

Morrow

Rio

et al. 2023

Surv Geophys

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This paper reviews the recent progress in our estimation of ocean dynamic topography and the derived surface geostrophic currents, mainly based on multiple nadir radar altimeter missions. These altimetric observations provide the cornerstone of our ocean circulation observing system from space. The largest signal in sea surface topography is from the mean surface dominated by the marine geoid, and we will discuss recent progress in observing the mean ocean circulation from altimetry, once the geoid and other corrections have been estimated and removed. We then address the recent advances in our observations of the large-scale and mesoscale ocean circulation from space, and the particular challenges and opportunities for new observations in the polar regions. The active research in the ocean barotropic tides and internal tidal circulation is also presented. The paper also addresses how our networks of global multi-satellite and in situ observations are being combined and assimilated to characterize the four-dimensional ocean circulation, for climate research and ocean forecasting systems. For the future of ocean circulation from space, the need for continuity of our current observing system is crucial, and we discuss the exciting enhancement to come with global wide-swath altimetry, the extension into the coastal and high-latitude regions, and proposals for direct total surface current satellites in the 2030 period.

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Changes in Atlantic Water Circulation Patterns and Volume Transports North of Svalbard Over the Last 12 Years (2008–2020)

Cited by 19 publications

References 45 publications

Atlantic Water Inflow Through the Yermak Pass Branch: Evolution Since 2007

Atlantic Water Inflow Through the Yermak Pass Branch: Evolution Since 2007

Exceptional sea ice loss leading to anomalously deep winter convection north of Svalbard in 2018

Ocean Circulation from Space

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