FORAMINIFERAL EVIDENCE OF A LATE HOLOCENE WESTWARD SHIFT OF THE ALEUTIAN LOW PRESSURE SYSTEM
Bibliographic record
Abstract
The late Holocene distribution of agglutinated foraminifera and freshwater thecamoebians was documented within a 12.26-m piston core (VEC02A04) deposited between 1090 to,4560 cal. yr BP, collected from the glacier-carved Frederick Sound, Seymour-Belize Inlet Complex (SBIC), British Columbia. Core sediments contained unevenly dis-tributed, massive and laminated intervals interrupted by occasional slumps and turbidites. The microfauna was characterized by low diversity and low abundances of agglutinated foraminifera (Shannon Diversity Index #1.36) with rare allochthonous freshwater thecamoebians. The predominance of low-oxygen-tolerant agglutinated foraminif-era, and absence of calcareous species indicate that dysoxia was the main environmental stressor. Abundant organic matter in the core sediments provides additional evidence of low-oxygen conditions that excluded most organisms that might have utilized this rich food resource. A moderate up-core increase in the abundance of glaciomarine indicator species (e.g., Spiroplectammina bifor-mis, Recurvoides turbinatus, Portatrochammina bipolaris, and Cribrostomoides jeffreysii) after 3125 cal. yr BP (above 7.19 m) indicates a subtle shift to progressively cooler bottom-water conditions. The presence of varying proportions of thecamoebians through this upper core interval was likely related to increased spring snowmelt or early summer precipitation, resulting in increased terrestrial erosion (e.g., reworking of marsh sediments into the fjord). Development of relatively cooler/drier climate conditions in the SBIC during the late Holocene corresponds to the neoglacial advances in the NE Pacific, which is directly linked to a weakened and/or westward shift in the center of action of the Aleutian Low
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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 | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".