Canyon Downwelling and Water Mass Influences on Winter Zooplankton Distributions in the Coastal Northeast Pacific

Howatt, Tara; Ross, Tetjana; Waterman, Stephanie

doi:10.1029/2022jc018540

Cited by 2 publications

(3 citation statements)

References 88 publications

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“…Onshore Juan de Fuca canyon flow during downwelling-favorable wind stress does not have precedent in literature. Downwelling-favorable winds were associated with offshore flow through canyons in idealized models (Spurgin and Allen, 2014), realistic models of the neighboring Clayoquot canyon (Howatt et al, 2022), and observations near the Juan de Fuca canyon floor (Cannon, 1972). However, the Juan de Fuca canyon is unique among northern CCS submarine canyons because its canyon head begins in the Strait of Juan de Fuca.…”

Section: Effect Of Canyons On Inflow Sourcementioning

confidence: 99%

Seasonal wind stress direction influences source and properties of inflow to the Salish Sea and Columbia River estuary

Brasseale,

MacCready

2023

Preprint

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Estuaries in the northern California current system (NCCS) experience seasonally reversing wind stress, which is expected to impact the origin and properties of shelf water which enters NCCS estuaries (’shelf inflow’). Wind stress has been shown to affect the source of shelf inflow by driving alongshelf currents. However, the effects of wind-driven Ekman dynamics and shelf currents from larger-scale forcing on shelf inflow have yet to be explored. Variations in shelf inflow to the Salish Sea and the Columbia River estuary, two large NCCS estuarine systems, were studied using a realistic hydrodynamic model. The paths and source of shelf water were identified using particles released on the shelf. Particles were released every two weeks of 2017 and tracked for sixty days. Shelf inflow was identified as particles that crossed the estuary mouths. Mean wind stress during each release was compared with initial horizontal and vertical positions and physical properties of shelf inflow particles. For both the Salish Sea and the Columbia River estuary, upwelling-favorable wind stress was correlated with a shelf inflow source north of the estuary mouth. Depth was not correlated with wind stress for either estuary, but relative depth (depth scaled by isobath) increased during upwelling-favorable winds for both. Properties of inflow changed from cold and fresh during upwelling to warm and salty during downwelling, reflecting seasonal changes in NCCS shelf waters. These results may be extended to predict the source and properties of shelf inflow to estuaries in other regions with known wind or shelf current patterns.

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Section: Effect Of Canyons On Inflow Sourcementioning

confidence: 99%

Seasonal wind stress direction influences source and properties of inflow to the Salish Sea and Columbia River estuary

Brasseale,

MacCready

2023

Preprint

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“…As the one of the widest shelf sea with abundant fishery resources, there is also a common DVM phenomenon in this area. Compared to the open ocean, the DVM of the shelf sea will have a more variable DVM pattern influenced by various factors such as tidal currents variation, complex current structure, seafloor limitations and sediment particles (Benoit‐Bird et al., 2017; Howatt et al., 2022). Meanwhile, DVM is an important process in the energy flow of marine ecosystems, and it plays a key role in the ocean's biologically driven carbon sequestration process (Bandara et al., 2021).…”

Section: Introductionmentioning

confidence: 99%

“…variation, complex current structure, seafloor limitations and sediment particles (Benoit-Bird et al, 2017;Howatt et al, 2022). Meanwhile, DVM is an important process in the energy flow of marine ecosystems, and it plays a key role in the ocean's biologically driven carbon sequestration process (Bandara et al, 2021).…”

mentioning

confidence: 99%

Spatial and Temporal Characteristics of Winter Diel Vertical Migration of Zooplankton and Nekton in the East China Shelf Seas Based on Multi‐Frequency Echosounder

Nie,

Li,

Liu

et al. 2023

JGR Oceans

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The diel vertical migration (DVM) of plankton and nekton plays an important role in the energy flow and material cycling of marine ecosystems. Especially in shelf seas, seasonal environmental variations may distinguish DVM characteristics in winter mixed water from summer pattern. Therefore, to investigate the patterns and influencing factors of winter DVM in East China Shelf Seas (ECSS), we carried out comprehensive research based on high‐resolution multi‐frequency acoustic data during the winter of 2019/2020. The results showed that: (a) acoustic and zooplankton sampling data can effectively capture the widely existence of winter DVM of different biological community in ECSS and their spatio‐temporal variabilities. (b) In East China Sea, the migration was mainly dominated by the Gas‐bearing class (GB), which had fast migration speed, compared to the Yellow Sea where the migration was dominated by the Fluid‐like class (FL). In addition, GB descends earlier than FL. (c) For large scale factors, during the full moon, the GB will aggregate deeper and the FL shallower, compared to the new moon, and regional temperature is an important factor affecting the distribution of organisms at meridional direction; for small scale processes, cold and warm currents and ocean fronts can also affect migration behavior. In the muddy area with full moon and spring tide, GB and FL show different inconsistent migration compared to normal relatively consistent pattern. These results will help us to better understand the physiological, ecological and environmental elements that control winter DVM, facilitating the management of ecosystem‐based fisheries resources.

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Canyon Downwelling and Water Mass Influences on Winter Zooplankton Distributions in the Coastal Northeast Pacific

Cited by 2 publications

References 88 publications

Seasonal wind stress direction influences source and properties of inflow to the Salish Sea and Columbia River estuary

Seasonal wind stress direction influences source and properties of inflow to the Salish Sea and Columbia River estuary

Spatial and Temporal Characteristics of Winter Diel Vertical Migration of Zooplankton and Nekton in the East China Shelf Seas Based on Multi‐Frequency Echosounder

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