Existence of an ice cap during the mid-Cretaceous period (120–90 Ma): an AGCM investigation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Annals of Glaciology Année : 1997

Existence of an ice cap during the mid-Cretaceous period (120–90 Ma): an AGCM investigation

Résumé

Many questions remain concerning whether or not an ice cap existed during the mid-Cretaceous period (120–90 Ma). Other than data and observations from ice-rafted materials, atmospheric general circulation models (AGCMs) may be appropriate tools to investigate whether changes in atmospheric composition, land-sea distribution, or oceanic circulation (used as boundary conditions to constrain the model), provide the climatic conditions that enable ice caps to be formed. This study uses an AGCM developed by the Laboratoire de Météorologie Dynamique (LMD) to perform a set of numerical sensitivity experiments to investigate plate tectonics (land–sea distribution and orography), CO2 partial pressure in the atmosphere and changes in prescribed sea-surface temperatures. The main goals are to quantify the effect of each forcing factor on the increase of Northern Hemisphere high-latitude temperatures, and to investigate whether combining these factors produce temperatures that would allow the ice-sheet formation.
Fichier principal
Vignette du fichier
ag4.pdf (4.74 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03011972 , version 1 (18-12-2020)

Identifiants

Citer

Gilles Ramstein, Frédéric Fluteau, Valérie Masson-Delmotte. Existence of an ice cap during the mid-Cretaceous period (120–90 Ma): an AGCM investigation. Annals of Glaciology, 1997, 25, pp.198-202. ⟨10.3189/S0260305500014038⟩. ⟨hal-03011972⟩
30 Consultations
24 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More