Satellite AVHRR observations of the intensification of the shelf break current during an upwelling event off Vancouver Island
Bibliographic record
Abstract
AVHRR satellite imagery during July 1984 was used to investigate the spatial and temporal variability of the shelf break current during an upwelling event off Vancouver Island. The onset of the order 10-day upwelling event initially appears as a plume of cold water at the tip of Brooks Peninsula. As the winds increase in strength, the plume of cold water migrates equatorward and takes on a jet-like structure that remains centred just seaward along the shelf break. As the winds dramatically weaken near the end of the upwelling event, there is intense warming of the surface waters along the shelf, but a band of cold water persists along the shelf break. Horizontal scales calculated from thermal fronts in the AVHRR imagery show that along the shelf break, the cross-shore scale is about 20 km, which is consistent with the internal Rossby radius. Approximately 70 km offshore, another thermal front is present, and this front is thought to represent the offshore extent of the shelf break current. AVHRR measurements of the SST were correlated with in situ temperature measurements, and a r² value of around 0.85 was obtained for the upper 3 m of the water column. The temporal variations in the AVHRR SST structure were related to the temporal variations of the coastal wind field, and to temporal variations in temperature measurements obtained from coastal light stations and subsurface moorings. The long-shore velocity was estimated from the AVHRR imagery, and speeds that were calculated to be from 10 and 80cm/s, were in agreement with long-shore speeds of 20 to 30 cm/s measured by a subsurface current mooring, and long-shore speeds between 10 and 100 cm/s calculated using a time-independent barotropic model. Results indicate that wind and topography play important roles in the upwelling response, and under the right conditions, AVHRR observations of SST are representative of dynamical processes within the ocean. The band of cold water along the shelf break is thought to be due to the combined processes of advection and shelf break upwelling.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 source (direct Gemma or distilled Codex), 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".