Turbulent Mixing During Late Summer in the Ice–Ocean Boundary Layer in the Central Arctic Ocean: Results From the MOSAiC Expedition

Kawaguchi, Yusuke; Koenig, Zoé; Nomura, Daïki; Hoppmann, Mario; Inoue, Jun; Fang, Ying-Chih; Schulz, Kirstin; Katlein, Christian; Nicolaus, Marcel; Rabe, Benjamin

doi:10.1029/2021jc017975

Cited by 12 publications

(2 citation statements)

References 71 publications

(133 reference statements)

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“…Drift track and speed were obtained from the Polarstern navigation records and complemented with data from a GPS buoy ("CO1") that remained on the floe when sampling was interrupted in spring. From the drift velocity, we calculated the ice friction velocity u ⋆ based on the Rossby similarity (see supplemental material Text S1), as done in Kawaguchi et al (2022).…”

Section: Methods and Instrumentationmentioning

confidence: 99%

The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

Schulz,

Koenig,

Muilwijk

et al. 2024

Preprint

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The Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC, 2019/2020), a year-long drift with the Arctic sea ice, has provided the scientific community with an unprecedented, multidisciplinary dataset from the Eurasian Arctic Ocean, covering high atmosphere to deep ocean across all seasons. However, the heterogeneity of data and the superposition of spatial and temporal variability, intrinsic to a drift campaign, complicate the interpretation of observations. In this study, we compile a quality-controlled hydrographic dataset with best spatio-temporal coverage and derive core parameters, including the mixed layer depth, heat fluxes over key layers, and friction velocity. We provide a comprehensive and accessible overview of the ocean conditions encountered along the MOSAiC drift, discuss their interdisciplinary implications, and compare common ocean climatologies to these new data. Our results indicate that - for the most parts - ocean variability was dominated by regional, rather than seasonal signals, with potentially strong implications for ocean biogeochemistry, ecology, sea ice, and even atmospheric conditions. Near-surface ocean properties are strongly influenced by the relative position of sampling within or outside the river-water influenced Transpolar Drift, and seasonal warming and meltwater input. Ventilation down to the Atlantic Water layer in the Nansen Basin allows for a stronger connectivity to both sea ice and surface ocean, including elevated upward heat fluxes. The Yermak Plateau and Fram Strait region are characterized by variable conditions, strong ocean currents, a stronger influence of Atlantic Water, and substantial lateral gradients in surface water properties in frontal regions. Together with the presented results and core parameters, we offer context for interdisciplinary research, fostering an improved understanding of the complex, coupled Arctic System.

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Section: Methods and Instrumentationmentioning

confidence: 99%

The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

Schulz,

Koenig,

Muilwijk

et al. 2024

Preprint

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“…We evaluated its uncertainty by comparing the results for = 3–5 day and found a ~ 7% difference in the accumulated net NIKE flux at the surface (Fig. 2 h) 35 .…”

Section: Methodsmentioning

confidence: 99%

Amplification of typhoon-generated near-inertial internal waves observed near the Tsushima oceanic front in the Sea of Japan

Kawaguchi

Yabe

Senjyu

et al. 2023

Sci Rep

Self Cite

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It is not fully understood how near-inertial kinetic energy (NIKE) is spatially distributed near Tsushima oceanic front (TOF) as a typhoon travels across the region. Underneath TOF, a year-round mooring covering a major part of water column was implemented in 2019. During summer, three massive typhoons (Krosa, Tapah, and Mitag) consecutively traversed the frontal area and delivered a substantial amount of NIKE into surface mixed layer. According to a mixed-layer slab model, NIKE was widely distributed near the cyclone’s track. The mooring observation exhibited the vertical distribution and pathways of surface-generated NIKE in response to the successive typhoon events. According to the modal decomposition, first three modes mostly explain the NIKE’s elevations following the typhoon events. According to ray-tracing experiments based on the internal-wave theory, large-scale near-inertial waves (NIWs) rapidly descend to a depth greater than 1000 m, while mesoscale NIWs slowly descend and rarely reached beyond the main pycnocline. Following the passage of Tapah, a profound energy mass was found nearly stationary at shallow depths coincident with vertical shear of geostrophic current. We infer that the descending rate of NIWs fell and then they were amplified through the energy conservation when the waves came from the north side of TOF.

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A generalized ice drift spectrum based on measurements in the Beaufort Sea

Sinsabvarodom,

Leira,

Høyland

et al. 2024

Ocean Engineering

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Turbulent Mixing During Late Summer in the Ice–Ocean Boundary Layer in the Central Arctic Ocean: Results From the MOSAiC Expedition

Cited by 12 publications

References 71 publications

The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

Amplification of typhoon-generated near-inertial internal waves observed near the Tsushima oceanic front in the Sea of Japan

A generalized ice drift spectrum based on measurements in the Beaufort Sea

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