Establishing damage criteria for multi-year ice phase I: thickness and temperature of drifting floes
Notice bibliographique
Résumé
Field measurements on multi-year ice in the Canadian Arctic Archipelago are presented, including detailed ice thickness measurements and results of the pilot program to document changes in the temperature of multi-year ice as its drifts through the Arctic. The relevance of monitoring the full thickness temperature of multi-year ice in space and time is that this information can be used subsequently as a proxy for ice thickness and strength. This work, which will span the next four years, is of interest to Transport Canada because it will provide mariners with information to help them rate the damage potential of multi-year ice. It is of interest to the Canadian Ice Service because the results can be incorporated into thermodynamic models and ice drift predictions of multi-year ice. More than 546 m of ice was drilled on four multi-year ice floes during the program. Comparison of thickness measurements from multi-year ice in Nares Strait (2007) and the Canadian Arctic Archipelago (2008) showed that ice upwards of 10 m thick exists in both regions – and, contrary to what one might expect, can be found quite easily. Due to limitations in the amount of auger flight available, the maximum ice thickness measured in Nares Strait during the 2007 season was 16.6 m, although the ice was often considerably thicker. In comparison, the maximum drill hole thickness measured in the Archipelago during the 2008 season was 16.9 m. The average floe thicknesses of the multi-year ice in Nares Strait (2007) ranged from 3.6 to more than 9.6 m, with standard deviations of 0.7 to 3.7 m. The average thickness of the four floes in the Canadian Archipelago (2008) ranged from 7.3 to 9.3 m, with standard deviations from 2.1 to 3.7 m. It should be noted that the crests of the more extreme ice ridges were not sampled during either program. Two months of full thickness temperatures for multi-year floe R02 (10.2 m thick) and three months of temperatures on multi-year floe R05 (10.4 m thick) showed that both floes warmed throughout their full thickness. The rapid warming that occurred at the bottom of Floe R05 during three weeks in August was interpreted as thinning of the ice – the bottom ice thinned by more than one metre in just three weeks. The same cannot be said of Floe R02 because the data terminated prematurely in late July, prior to the onset of bottom ablation. The migration of Floe R02 was documented from 30 May to 20 September, during which time the floe drifted about 1000 km through the Canadian Archipelago. In comparison, Floe R05 circulated in Wellington Channel until 16 August, when the last positional data were obtained from that floe.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,001 |
| Bibliométrie | 0,004 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».