Atmospheric circulation comparisons between the 2001 and 2002 and the 1961 and 1988 Canadian prairie droughts
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Bibliographic record
Abstract
Abstract The 2001 and 2002 Canadian Prairie droughts were unusual climatological events in terms of their extreme precipitation anomalies and extraordinary persistence. Over the west‐central Prairie Provinces, well below normal precipitation was recorded for a remarkable eight consecutive seasons from autumn 2000 to summer 2002. Analysis of the mid‐tropospheric circulation during these droughts indicates that the patterns were markedly different from those associated with the severe, multi‐season Prairie droughts of 1961 and 1988. In particular, the circulation during 2001 and 2002 lacked the distinct meridional flow over the North Pacific and North America that has been associated with previous dry periods over western Canada. Moreover, the evolution and persistence of the 2001–2002 droughts have no clear relationships with large‐scale teleconnection patterns that have influenced past climate extremes over western regions of the country. Results suggest that the recent droughts may be related to a northward extension of persistent drought producing circulation anomalies that influenced the continental United States. These differences in circulation indicate that further research is required to gain a better understanding and aid in the prediction of extended dry periods over North America. Résumé [Traduit par la rédaction] Les sécheresses survenues en 2001 et 2002 dans les Prairies canadiennes étaient des événements climatologiques inhabituels de par leur anomalie de précipitations extrême et leur persistance extraordinaire. Dans le centre‐ouest des provinces des Prairies, des précipitations bien inférieures à la normale ont été enregistrées pendant une période remarquable de huit saisons consécutives, de l'automne 2000 à l'été 2002. L'analyse de la circulation dans la troposphère moyenne durant ces périodes de sécheresse indique que les configurations étaient nettement différentes de celles qui ont caractérisé les fortes sécheresses de plusieurs saisons dans les Prairies en 1961 et en 1988. En particulier, la circulation en 2001 et 2002 n'affichait pas la composante méridienne distincte au‐dessus du Pacifique Nord et de l'Amérique du Nord qui a été associée aux périodes sèches précédentes dans l'Ouest canadien. En outre, il n'existe pas de relation claire entre l'évolution et la persistance des sécheresses de 2001 et 2002 et les configurations de téléconnexion à grande échelle qui ont influencé les extrêmes climatiques du passé dans l'ouest du pays. Les résultats suggèrent que les sécheresses récentes pourraient être liées à une extension vers le nord d'anomalies persistantes de circulation propices à la sécheresse qui ont influencé le territoire continental des États‐Unis. Ces différences dans la circulation indiquent que d'autres recherches sont nécessaires pour mieux comprendre et mieux prévoir les périodes sèches prolongées en Amérique du Nord. Notes Corresponding author's e‐mail: barrie.bonsal@ec.gc.ca
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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 | 0.001 | 0.001 |
| 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 it