Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories
Notice bibliographique
Résumé
The effects of slope, aspect and vegetation cover on the radiation balance and active layer thermal regime of arctic tundra were investigated during the summer of 1999 and the spring of 2000. The study site is located at Daring Lake, N.W.T (64°52'N, 111°35'W) in the Slave Geological Province of the Coppermine River Basin. A sub-basin 14 ha in area and with approximately 30 meters of relief was intensely monitored for hydrological radiation and energy balance components. Initiation of active layer development and subsequent thawing was earlier and more pronounced on predominantly west facing slopes due to increased receipt of incoming solar radiation. Late summer active layer depths were the greatest on west-facing slopes as compared to north-and east-facing slopes (>170 cm. 84.0 ±21.7 cm. 49.2 ±0.8 cm respectively). Incoming shortwave radiation values were extrapolated from the met site to various basin sites taking slope and aspect into account. Spatial and diurnal variations in albedo were minimal within the Kakawi Lake Basin. As well, surface temperature measurements varied little from site to site causing the long wave radiation balance to remain relatively constant. Incoming shortwave radiation was determined to control diurnal fluctuations in the net radiation balance on a daily and seasonal basis but represented less than one half (41%) of the radiative supply to the surface. Ground heat flux increased downslope on west- and north-facing hillslopes corresponding with an increase in active layer development during the summer season. Conversely, basal flux out of the active layer to the underlying permafrost decreased downslope. The sensible heat flux varied least with depth between the study sites but accounted for a significant proportion of the ground flux at sites with deeper active layers. Active layer depths at peat dominated, east-facing hillslope sites were only 59% of the average depth on west- and north-facing slopes primarily due to the high water content and reduced thermal conductivity of peat soils. Latent heat is largest at the beginning of the thaw season when there is rapid active layer development but is later reduced as ground thaw slackens. Kakawi Lake Basin precipitation input, outflow and lake water level were recorded daily throughout the 36 day study period while evaporation was estimated based on a study conducted in a nearby basin. Lateral inflow from catchment hillslopes was determined to the dominant component of the Kakawi Lake Basin hydrological balance for the 1999 study period. Peat dominated areas were disconnected throughout much of the study period but drained as a single source during rainfall events.
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 | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 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 ».