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Akademický článek

Fluorescence-based primary productivity estimates are influenced by non-photochemical quenching dynamics in Arctic phytoplankton

Autor: Yayla Sezginer, Douglas Campbell, Sacchinandan Pillai, Philippe Tortell

Publikováno v: Frontiers in Microbiology, Vol 14 (2023)

Chlorophyll fluorescence-based estimates of primary productivity typically include dark or low-light pre-treatments to relax non-photochemical quenching (NPQ), a process that influences the relationship between PSII photochemistry and fluorescence yi

Externí odkaz: https://doaj.org/article/6f492d62d14d432f948d1dc4c282d9f6

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Akademický článek

Drivers and Potential Consequences of Observed Extreme Hypoxia Along the Canadian Pacific Continental Shelf

Autor: Ana C. Franco, Debby Ianson, Tetjana Ross, Charles Hannah, Akash Sastri, Philippe D. Tortell

Publikováno v: Geophysical Research Letters, Vol 50, Iss 6, Pp n/a-n/a (2023)

Abstract Bottom waters of the northeast Pacific continental shelf naturally experience localized hypoxic conditions, with significant influences on food webs and biogeochemical cycling. In August 2021, extreme hypoxia was detected from several measur

Externí odkaz: https://doaj.org/article/e083908bc23a454395b2b1667965045f

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Akademický článek

Improved prediction of dimethyl sulfide (DMS) distributions in the northeast subarctic Pacific using machine-learning algorithms

Autor: B. J. McNabb, P. D. Tortell

Publikováno v: Biogeosciences, Vol 19, Pp 1705-1721 (2022)

Dimethyl sulfide (DMS) is a volatile biogenic gas with the potential to influence regional climate as a source of atmospheric aerosols and cloud condensation nuclei (CCN). The complexity of the oceanic DMS cycle presents a challenge in accurately pre

Externí odkaz: https://doaj.org/article/04831b8ea87944feaf6677751850eacf

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Akademický článek

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Akademický článek

Ideas and perspectives: A strategic assessment of methane and nitrous oxide measurements in the marine environment

Publikováno v: Biogeosciences, Vol 17, Pp 5809-5828 (2020)

In the current era of rapid climate change, accurate characterization of climate-relevant gas dynamics – namely production, consumption, and net emissions – is required for all biomes, especially those ecosystems most susceptible to the impact of

Externí odkaz: https://doaj.org/article/3b7984b0fdc645df9d1570e6545f34dd

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Akademický článek

Decoupling of ΔO2∕Ar and particulate organic carbon dynamics in nearshore surface ocean waters

Autor: S. Z. Rosengard, R. W. Izett, W. J. Burt, N. Schuback, P. D. Tortell

Publikováno v: Biogeosciences, Vol 17, Pp 3277-3298 (2020)

We report results from two Lagrangian drifter surveys off the Oregon coast, using continuous shipboard sensors to estimate mixed-layer gross primary productivity (GPP), community respiration (CR), and net community production (NCP) from variations in

Externí odkaz: https://doaj.org/article/b6436e77cf47458a8848629c6f3ba620

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Akademický článek

ΔO2/N2′ as a New Tracer of Marine Net Community Production: Application and Evaluation in the Subarctic Northeast Pacific and Canadian Arctic Ocean

Autor: Robert W. Izett, Roberta C. Hamme, Craig McNeil, Cara C. M. Manning, Annie Bourbonnais, Philippe D. Tortell

Publikováno v: Frontiers in Marine Science, Vol 8 (2021)

We compared field measurements of the biological O2 saturation anomalies, ΔO2/Ar and ΔO2/N2, from simultaneous oceanographic deployments of a membrane inlet mass spectrometer and optode/gas tension device (GTD). Data from the Subarctic Northeast Pa

Externí odkaz: https://doaj.org/article/94bb5bf914554c3c89a5f0d96882e2b4

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Akademický článek

Single-Turnover Variable Chlorophyll Fluorescence as a Tool for Assessing Phytoplankton Photosynthesis and Primary Productivity: Opportunities, Caveats and Recommendations

Publikováno v: Frontiers in Marine Science, Vol 8 (2021)

Phytoplankton photosynthetic physiology can be investigated through single-turnover variable chlorophyll fluorescence (ST-ChlF) approaches, which carry unique potential to autonomously collect data at high spatial and temporal resolution. Over the pa

Externí odkaz: https://doaj.org/article/75dcf97c81d64c7b98f8ae3e0360cdda

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Akademický článek

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Akademický článek

Patterns and drivers of dimethylsulfide concentration in the northeast subarctic Pacific across multiple spatial and temporal scales

Autor: A. E. Herr, R. P. Kiene, J. W. H. Dacey, P. D. Tortell

Publikováno v: Biogeosciences, Vol 16, Pp 1729-1754 (2019)

The northeast subarctic Pacific (NESAP) is a globally important source of the climate-active gas dimethylsulfide (DMS), yet the processes driving DMS variability across this region are poorly understood. Here we examine the spatial distribution of DM

Externí odkaz: https://doaj.org/article/1008efd13cd04b369903a3a274cdb166

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