Characterisation of Dansgaard¿Oeschger events in palaeoclimate time series using the matrix profile method

• Tipo: Artigo em Revista Científica Internacional
• Data: 2024

Autores

Barbosa, S (Autor) Outra; Maria Eduarda Silva (Autor) FEP; Rousseau, D (Autor) Outra

Revista

Título: Nonlinear Processes in Geophysics

Vol. 31

Páginas: 433-447

ISSN: 1023-5809

Editora: Copernicus

Outras Informações

ID Authenticus: P-016-Z8M

DOI: 10.5194/npg-31-433-2024

Abstract (EN): <jats:p>Abstract. Palaeoclimate time series, reflecting the state of Earth's climate in the distant past, occasionally display very large and rapid shifts showing abrupt climate variability. The identification and characterisation of these abrupt transitions in palaeoclimate records is of particular interest as this allows for understanding of millennial climate variability and the identification of potential tipping points in the context of current climate change. Methods that are able to characterise these events in an objective and automatic way, in a single time series, or across two proxy records are therefore of particular interest. In our study the matrix profile approach is used to describe Dansgaard¿Oeschger (DO) events, abrupt warmings detected in the Greenland ice core, and Northern Hemisphere marine and continental records. The results indicate that canonical events DO-19 and DO-20, occurring at around 72 and 76¿ka, are the most similar events over the past 110¿000 years. These transitions are characterised by matching transitions corresponding to events DO-1, DO-8, and DO-12. They are abrupt, resulting in a rapid shift to warmer conditions, followed by a gradual return to cold conditions. The joint analysis of the ¿18O and Ca2+ time series indicates that the transition corresponding to the DO-19 event is the most similar event across the two time series. </jats:p>

Idioma: Inglês

Tipo (Avaliação Docente): Científica