Tipo
Artigos em Revista
Tipo de Documento
Artigo Completo
Título
Weak tides during Cryogenian glaciations
Participantes na publicação
J. A. Mattias Green (Author)
Hannah S. Davies (Author)
Instituto Dom Luiz (IDL), Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749–016, Lisboa, Portugal
Joao C. Duarte (Author)
Dep. Geologia
Dep. Geologia
IDL
Jessica R. Creveling (Author)
Christopher Scotese (Author)
Resumo
The severe “Snowball Earth” glaciations proposed to have existed during the Cryogenian period (720 to 635 million years ago) coincided with the breakup of one supercontinent and assembly of another. Whereas the presence of extensive continental ice sheets predicts a tidally energetic Snowball ocean due to the reduced ocean depth, the supercontinent palaeogeography predicts weak tides because the surrounding ocean is too large to host tidal resonances. Here we show, using an established numerical global tidal model and paleogeographic reconstructions, that the Cryogenian ocean hosted diminished tidal amplitudes and associated energy dissipation rates, reaching 10–50% of today’s rates, during the Snowball glaciations. We argue that the near-absence of Cryogenian tidal processes may have been one contributor to the prolonged glaciations if these were near-global. These results also constrain lunar distance and orbital evolution throughout the Cryogenian, and highlight that simulations of past oceans should include explicit tidally driven mixing processes.
Data de Publicação
2020-12
Suporte
Nature Communications
Identificadores da Publicação
ISSN - 2041-1723
Editora
Springer Science and Business Media LLC
Identificadores do Documento
DOI -
https://doi.org/10.1038/s41467-020-20008-3
URL -
http://dx.doi.org/10.1038/s41467-020-20008-3
Identificadores de Qualidade
SCOPUS (2020) -
Web Of Science Q1 (2020) - 14.919 - Science
SCIMAGO Q1 (2020) - 5.56 - Physics and Astronomy