Seasonal and interannual oxygen variability on the Washington and Oregon continental shelves

Siedlecki, Samantha A.; Banas, Neil S.; Davis, Kristen A.; Giddings, Sarah N.; Hickey, Barbara M.; MacCready, Parker; Connolly, Thomas P.; Geier, S.

doi:10.1002/2014jc010254

Cited by 82 publications

(87 citation statements)

References 92 publications

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“…Thus, high concentrations of mycosporine-like amino acid compounds released from senescing cells during storm events may have been trapped as foam along the Washington shoreline. By contrast, because the Oregon coastline is relatively less retentive (Siedlecki et al 2015), neither foam nor unusually high carcass deposition were observed along northern Oregon beaches despite the presence of the A. sanguinea bloom. Retentive systems, including Monterey Bay (Ryan et al 2008), may be particularly prone to this specific etiology of HAB impact.…”

Section: Discussionmentioning

confidence: 78%

“…5B) and that the bloom was also present along the coastline of Oregon (Du et al 2011), but did not result in elevated rates of carcass deposition there. Although the Washington coastline is not considered a retentive system, the wide shelf, the relatively weak upwelling winds and the frequent presence of the plume from the Columbia River along the coast north of the river mouth during storms (Hickey & Banas 2008) likely result in this region retaining particles, including HABs, for longer periods than, by comparison, the Oregon coast (Siedlecki et al 2015). Thus, high concentrations of mycosporine-like amino acid compounds released from senescing cells during storm events may have been trapped as foam along the Washington shoreline.…”

Section: Discussionmentioning

confidence: 99%

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Mass mortality of marine birds in the Northeast Pacific caused by Akashiwo sanguinea

Jones¹,

Parrish²,

Punt³

et al. 2017

Mar. Ecol. Prog. Ser.

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Harmful algal blooms (HABs) are dense concentrations of phytoplankton that can have deleterious effects on marine life. We documented two of the largest marine bird mortality events ever definitively ascribed to a single HAB, the cause of which was death resulting from plumage fouling by surfactant-like proteins produced by the dinoflagellate Akashiwo sanguinea. The two mortality events were observed along the coast of Washington State in September and October 2009, collectively representing an estimated deposition of 10 500 carcasses, of which the majority were surf scoters, white-winged scoters and common murres. Each mortality event was coincident in space and time with observed bloom landfall, with each event preceded by a similar chain of environmental conditions. Prior to each event, the presence of A. sanguinea and upwelling-favourable conditions likely led to bloom proliferation. In both cases, this period was followed by conditions that transported the senescent bloom into the nearshore environment, whereupon subsequent wave action lysed A. sanguinea cells, creating foam that contained surfactant-like compounds. This sequence of conditions, exacerbated by the presence of aggregations of marine birds in wing moult, appear to be the necessary requirements for marine bird mortality of this scale due to foam-induced plumage fouling. This mechanism of HAB-induced mortality may become more prevalent in the California Current System given the apparent increasing occurrence of HABs and the broad environmental tolerances exhibited by A. sanguinea.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Mass mortality of marine birds in the Northeast Pacific caused by Akashiwo sanguinea

Jones¹,

Parrish²,

Punt³

et al. 2017

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

show abstract

“…Using a similar configuration to the one used in the present study on the Namibian OMZ, Gutknecht et al (2013a) observed that the differences between the simulated OMZ volume and CARS increased towards the shelf, which could be related to the exclusion of the DO demand from the sediments in the model. The role of benthic processes in constraining the DO demand has been studied in the northern California current system (Bianucci et al, 2012;Siedlecki et al, 2015), indicating that locally such processes might be essential to explain the hypoxic conditions. The inclusion of a sediment module in the current model setting is planned for future work to address this issue.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variability of the oxygen minimum zone off Peru in a high-resolution regional coupled model

et al. 2016

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Abstract. In addition to being one of the most productive upwelling systems, the oceanic region off Peru is embedded in one of the most extensive oxygen minimum zones (OMZs) of the world ocean. The dynamics of the OMZ off Peru remain uncertain, partly due to the scarcity of data and to the ubiquitous role of mesoscale activity on the circulation and biogeochemistry. Here we use a high-resolution coupled physical/biogeochemical model simulation to investigate the seasonal variability of the OMZ off Peru. The focus is on characterizing the seasonal cycle in dissolved O 2 (DO) eddy flux at the OMZ boundaries, including the coastal domain, viewed here as the eastern boundary of the OMZ, considering that the mean DO eddy flux in these zones has a significant contribution to the total DO flux. The results indicate that the seasonal variations of the OMZ can be interpreted as resulting from the seasonal modulation of the mesoscale activity. Along the coast, despite the increased seasonal low DO water upwelling, the DO peaks homogeneously over the water column and within the Peru Undercurrent (PUC) in austral winter, which results from mixing associated with the increase in both the intraseasonal wind variability and baroclinic instability of the PUC. The coastal ocean acts therefore as a source of DO in austral winter for the OMZ core, through eddy-induced offshore transport that is also shown to peak in austral winter. In the open ocean, the OMZ can be divided vertically into two zones: an upper zone above 400 m, where the mean DO eddy flux is larger on average than the mean seasonal DO flux and varies seasonally, and a lower part, where the mean seasonal DO flux exhibits verticalzonal propagating features that share similar characteristics than those of the energy flux associated with the annual extratropical Rossby waves. At the OMZ meridional boundaries where the mean DO eddy flux is large, the DO eddy flux has also a marked seasonal cycle that peaks in austral winter (spring) at the northern (southern) boundary. In the model, the amplitude of the seasonal cycle is 70 % larger at the southern boundary than at the northern boundary. Our results suggest the existence of distinct seasonal regimes for the ventilation of the OMZ by eddies at its boundaries. Implications for understanding the OMZ variability at longer timescales are discussed.

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“…Giddings et al (2014) also describes validation against moored, ship-based, and satellite observations of water properties and currents for the years 2004Ð2007. Biogeochemical validation for the same years is provided by Davis et al (2014) and Siedlecki et al (2015).…”

Section: Oceanographic Datamentioning

confidence: 99%

Estimating behavior in a black box: how coastal oceanographic dynamics influence yearling Chinook salmon marine growth and migration behaviors

et al. 2016

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0508-7This version is available at https://strathprints.strath.ac.uk/58466/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. AbstractOcean currents or temperature may substantially influence migration behavior in many marine species. However, high-resolution data on animal movement in the marine environment are scarce; therefore, analysts and managers must typically rely on unvalidated assumptions regarding movement, behavior, and habitat use. We used a spatially explicit, individual-based model of early marine migration with two stocks of yearling Chinook salmon to quantify the influence of external forces on estimates of swim speed, consumption, and growth. Model results suggest that salmon behaviorally compensate for changes in the strength and direction of ocean currents. These compensations can result in salmon swimming several times farther than their net movement (straight-line distance) would indicate. However, the magnitude of discrepancy between compensated and straight-line distances varied between oceanographic models. Nevertheless, estimates of relative swim speed among fish groups were less sensitive to the choice of model than estimates of absolute individual swim speed. By comparing groups of fish, this tool can be applied to management questions, such as how experiences and behavior may differ between groups of hatchery fish released early vs. later in the season. By taking into account the experiences and behavior of individual fish, as well as the influence of physical ocean processes, our approach helps illuminate the "black box" of juvenile salmon behavior in the early marine phase of the life cycle.

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Seasonal and interannual oxygen variability on the Washington and Oregon continental shelves

Cited by 82 publications

References 92 publications

Mass mortality of marine birds in the Northeast Pacific caused by Akashiwo sanguinea

Mass mortality of marine birds in the Northeast Pacific caused by Akashiwo sanguinea

Seasonal variability of the oxygen minimum zone off Peru in a high-resolution regional coupled model

Estimating behavior in a black box: how coastal oceanographic dynamics influence yearling Chinook salmon marine growth and migration behaviors

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