Rethinking the Spanish plume: An airstream analysis challenges the canonical conceptual model
Bibliographic record
Abstract
Abstract The canonical Spanish plume is a summertime southerly airstream that is heated while travelling across the Meseta Central on the Iberian Peninsula, developing into an elevated mixed layer farther poleward. A recent review of the literature paints a sometimes unevidenced, inconsistent, unclear, and inaccurate picture of the Spanish plume, raising questions about the evidence supporting this canonical conceptual model. A case of a Spanish‐plume synoptic pattern from 1 to 2 July 2015 is studied, using air‐parcel trajectories calculated from a mesoscale model simulation to identify four distinct airstreams responsible for the unstable thermodynamic profile over the United Kingdom: (1) a near‐surface continental airstream transporting hot, moist boundary‐layer air from France to the United Kingdom; (2) a lid (850‐hPa) airstream descended from the mid‐troposphere over the eastern North Atlantic and western Iberian Peninsula, initially warm and dry, but gradually cooling, moistening, and rising while travelling northward, forming a layer of convective inhibition; (3) a subtropical airstream of hot, dry air with steep lapse rates travelling poleward from North Africa and the Mediterranean then ascending near the United Kingdom; and (4) a middle‐latitude upper‐level trough airstream travelling eastward from the North Atlantic Ocean then ascending near the United Kingdom. These results challenge the canonical Spanish‐plume synoptic pattern in three ways. First, most air reaching the United Kingdom did not travel over the Iberian Peninsula, particularly in the near‐surface and lid airstreams. Second, steep lapse rates were pre‐existing from the subtropics rather than created when passing over the Iberian Peninsula. Third, the lid resulted from subsidence rather than surface heating. Thus, the synoptic‐scale pattern appeared to exert a larger control over the thermodynamics of the Spanish‐plume airstream than heating from the Iberian Peninsula. A new conceptual model is proposed that does not require surface heating over the Iberian Peninsula.
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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 | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.004 | 0.003 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 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 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".