The Relationship Between the Global Mean Deep‐Sea and Surface Temperature During the Early Eocene - Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement Accéder directement au contenu
Article Dans Une Revue Paleoceanography and Paleoclimatology Année : 2023

The Relationship Between the Global Mean Deep‐Sea and Surface Temperature During the Early Eocene

Barbara Goudsmit‐harzevoort
Angelique Lansu
Michiel L J Baatsen
Anna S von der Heydt
Niels J de Winter
Yurui Zhang
Ayako Abe‐ouchi
Agatha de Boer
Wing‐le Chan
David K Hutchinson
Gregor Knorr
Polina Morozova
  • Fonction : Auteur
Igor Niezgodzki
Sebastian Steinig
Aradhna Tripati
Zhongshi Zhang
Jiang Zhu
Martin Ziegler

Résumé

Estimates of global mean near-surface air temperature (global SAT) for the Cenozoic era rely largely on paleo-proxy data of deep-sea temperature (DST), with the assumption that changes in global SAT covary with changes in the global mean deep-sea temperature (global DST) and global mean sea-surface temperature (global SST). We tested the validity of this assumption by analyzing the relationship between global SST, SAT, and DST using 25 different model simulations from the Deep-Time Model Intercomparison Project simulating the early Eocene Climatic Optimum (EECO) with varying CO 2 levels. Similar to the modern situation, we find limited spatial variability in DST, indicating that local DST estimates can be regarded as a first order representative of global DST. In line with previously assumed relationships, linear regression analysis indicates that both global DST and SAT respond stronger to changes in atmospheric CO 2 than global SST by a similar factor. Consequently, this model-based analysis validates the assumption that changes in global DST can be used to estimate changes in global SAT during the early Cenozoic. Paleo-proxy estimates of global DST, SST, and SAT during EECO show the best fit with model simulations with a 1,680 ppm atmospheric CO 2 level. This matches paleo-proxies of EECO atmospheric CO 2 , indicating a good fit between models and proxy-data.
Fichier principal
Vignette du fichier
Paleoceanog and Paleoclimatol - 2023 - Goudsmit‐Harzevoort - The Relationship Between the Global Mean Deep‐Sea and Surface.pdf (3.05 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04030591 , version 1 (15-03-2023)

Identifiants

Citer

Barbara Goudsmit‐harzevoort, Angelique Lansu, Michiel L J Baatsen, Anna S von der Heydt, Niels J de Winter, et al.. The Relationship Between the Global Mean Deep‐Sea and Surface Temperature During the Early Eocene. Paleoceanography and Paleoclimatology, 2023, 38 (3), pp.e2022PA004532. ⟨10.1029/2022pa004532⟩. ⟨hal-04030591⟩
51 Consultations
36 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More