Particulate organic carbon export in the upper twilight zone during the decline of the spring bloom
Bibliographic record
Abstract
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 356:81-92 (2008) - DOI: https://doi.org/10.3354/meps07291 Particulate organic carbon export in the upper twilight zone during the decline of the spring bloom Julien Pommier1, Christine Michel2,*, Michel Gosselin1 1Institut des sciences de la mer (ISMER), Université du Québec à Rimouski, 310 allée des Ursulines, Rimouski, Québec G5L 3A1, Canada 2Freshwater Institute, Fisheries and Oceans Canada, 501 University Crescent, Winnipeg, Manitoba R3T 2N6, Canada *Corresponding author. Email: michelc@dfo-mpo.gc.ca ABSTRACT: The variability of particulate organic carbon (POC) sinking flux and its relationship to primary production were investigated in the upper twilight zone of the northwest Atlantic Ocean on 4 occasions during a Lagrangian study of the decline of a spring diatom bloom and its transition towards post-bloom conditions. POC sinking fluxes below the euphotic zone (50 to 75 m depth) decreased from (mean ± SD) 674 ± 105 to 281 ± 17 mg C m-2 d-1 throughout the senescence of the bloom and further decreased to 197 ± 2 mg C m-2 d-1 under post-bloom conditions. POC sinking fluxes below the euphotic zone were positively correlated to the production of large phytoplankton cells (≥5 µm) throughout the study period, highlighting the importance of the size structure of primary producers in shaping the export of POC from the euphotic zone. In contrast, POC sinking fluxes at 150 m depth showed little variation throughout the study period. Analysis of the vertical profiles of POC sinking flux revealed an increase in POC transfer efficiency from 50 to 150 m depth due to a decrease in POC recycling within the upper twilight zone throughout the decline of the bloom. Moreover, POC recycling within the upper twilight zone was positively correlated with POC sinking fluxes below the euphotic zone throughout the study period, suggesting that recycling processes in the upper twilight zone respond rapidly and proportionally to the export of POC from the euphotic zone. It is hypothesized that the concomitant decreases in POC sinking fluxes below the euphotic zone and in POC recycling within the upper twilight zone compensated each other and could explain the fairly constant POC sinking fluxes at 150 m depth that were observed throughout the study period. Our results shed light on the importance of short-term variability in organic matter recycling within the upper twilight zone for the efficiency of POC export to depth. KEY WORDS: POC sinking fluxes · Primary production · Twilight zone · Sediment trap · Fecal pellets · Spring bloom · Northwest Atlantic Ocean Full text in pdf format PreviousNextCite this article as: Pommier J, Michel C, Gosselin M (2008) Particulate organic carbon export in the upper twilight zone during the decline of the spring bloom. Mar Ecol Prog Ser 356:81-92. https://doi.org/10.3354/meps07291 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 356. Online publication date: March 18, 2008 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2008 Inter-Research.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".