Impact of interocean exchange on the Atlantic overturning circulation
Notice bibliographique
Résumé
The awareness that human activity could change climate has greatly raised public and scientific interest in climate.\n One issue of present-day climate research is the stability of the thermohaline circulation. This overturning\n circulation, popularly known as the `conveyor belt', redistributes water, heat and salt over the entire globe, and\n is, for instance, responsible for the relatively warm climate in western Europe. Despite the fact that this\n thermohaline circulation is presently very stable, it probably played an important role in climate fluctuations and\n switches during the Pleistocene era of ice ages. The possibility that the thermohaline circulation may weaken or\n even come to a halt as response to global warming gives reason for concern in light of climate change scenarios.\n In this dissertation it is studied how the strength and stability of the overturning circulation are influenced by the\n exchange of water between the Atlantic Ocean and the rest of the World Ocean. As part of the global\n thermohaline circulation, the Atlantic exports so-called North Atlantic Deep Water (NADW). NADW is formed\n by strong atmospheric cooling of surface water in the Nordic and Labrador Seas in the northern North Atlantic.\n The Atlantic imports water on shallower levels to compensate for this export of NADW. Part of this water\n returns via the Drake Passage (between South America and the Antarctic continent); the remaining part enters\n south of Africa, via a process called Agulhas Leakage. This Indian-Atlantic exchange is accomplished by\n Agulhas rings, which are about 300 km large and filled with warm and salty Indian Ocean water. It has been\n suggested that this exchange could stimulate the Atlantic overturning circulation. Agulhas Leakage is sensitive to\n climate change, and palaeoclimatological data suggest that Agulhas Leakage has been strongly reduced during\n the last ice-age. This could indicate that the restart of Agulhas Leakage at the end of the last ice-age stimulated\n the restart of the overturning circulation. The studies of the dissertation show that the exchange of heat and salt\n between the Atlantic Ocean and the rest of the World Ocean exerts a considerable influence on the strength of\n the Atlantic overturning circulation. In particular, the heat and salt exchange by Agulhas Leakage turns out to\n strengthen and stabilize the overturning with respect to, for instance, enhanced inflow of freshwater from the\n Arctic (mainly derived from the North Pacific via the Bering Strait). These results show that the absence of\n Agulhas Leakage during the latest ice-age may have been partly responsible for weakening of glacial circulation.\n This may also have decreased its stability, so that it was more vulnerable to disturbances (like periods of\n enhanced meltwater discharge). The recovery of Agulhas Leakage at the end of the last ice-age may thus well\n have stimulated the restart of the overturning circulation. At the moment, the variability of Agulhas Leakage is\n small, so that the effect on European climate is negligible. However, the fact that Agulhas Leakage stabilizes the\n present-day circulation diminishes the possibility of a catastrophic climate change as result of global warming.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| 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 | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,002 | 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 tête enseignante, 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 ».