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Detalhes

Detalhes

008
Publicações

2023

Automatic characterisation of Dansgaard-Oeschger events in palaeoclimate ice records

Autores
Barbosa, S; Silva, ME; Dias, N; Rousseau, D;

Publicação

Abstract
<p align="justify">Greenland ice core records display abrupt transitions, designated as Dansgaard-Oeschger (DO) events, characterised by episodes of rapid warming (typically decades) followed by a slower cooling. The identification of abrupt transitions is hindered by the typical low resolution and small size of paleoclimate records, and their significant temporal variability. Furthermore, the amplitude and duration of the DO events varies substantially along the last glacial period, which further hinders the objective identification of abrupt transitions from ice core records Automatic, purely data-driven methods, have the potential to foster the identification of abrupt transitions in palaeoclimate time series in an objective way, complementing the traditional identification of transitions by visual inspection of the time series.</p> <p align="justify">In this study we apply an algorithmic time series method, the Matrix Profile approach, to the analysis of the NGRIP Greenland ice core record, focusing on:</p> <p align="justify">- the ability of the method to retrieve in an automatic way abrupt transitions, by comparing the anomalies identified by the matrix profile method with the expert-based identification of DO events;</p> <p align="justify">- the characterisation of DO events, by classifying DO events in terms of shape and identifying events with similar warming/cooling temporal pattern</p> <p align="justify">The results for the NGRIP time series show that the matrix profile approach struggles to retrieve all the abrupt transitions that are identified by experts as DO events, the main limitation arising from the diversity in length of DO events and the method’s dependence on fixed-size sub-sequences within the time series. However, the matrix profile method is able to characterise the similarity of shape patterns between DO events in an objective and consistent way.</p>

2023

Precipitation-driven gamma radiation enhancement over the Atlantic Ocean

Autores
Barbosa, S; Dias, N; Almeida, C; Silva, G; Ferreira, A; Camilo, A; Silva, E;

Publicação
Journal of Geophysical Research: Atmospheres

Abstract

2022

Extreme heat events in the Iberia Peninsula from extreme value mixture modeling of ERA5-Land air temperature

Autores
Barbosa, S; Scotto, MG;

Publicação
WEATHER AND CLIMATE EXTREMES

Abstract

2022

An holistic monitoring system for measurement of the atmospheric electric field over the ocean - The SAIL campaign

Autores
Barbosa, S; Dias, N; Almeida, C; Amaral, G; Ferreira, A; Lima, L; Silva, I; Martins, A; Almeida, J; Camilo, M; Silva, E;

Publicação
OCEANS 2022

Abstract
The atmospheric electric field is a key characteristic of the Earth system. Despite its relevance, oceanic measurements of the atmospheric electric field are scarce, as typically oceanic measurements tend to be focused on ocean properties rather than on the atmosphere above. This motivated the set-up of an innovative campaign on board the sail ship NRP Sagres focused on the measurement of the atmospheric electric field in the marine boundary layer. This paper describes the monitoring system that was developed to measure the atmospheric electric field during the planned circumnavigation expedition of the sail ship NRP Sagres. © 2022 IEEE.

2021

New metrology for radon at the environmental level

Autores
Röttger, A; Röttger, S; Grossi, C; Vargas, A; Curcoll, R; Otáhal, P; Hernández Ceballos, MÁ; Cinelli, G; Chambers, S; Barbosa, SA; Ioan, MR; Radulescu, I; Kikaj, D; Chung, E; Arnold, T; Yver Kwok, C; Fuente, M; Mertes, F; Morosh, V;

Publicação
Measurement Science and Technology

Abstract

Teses
supervisionadas

2022

Prediction of extreme values in data streams

Autor
Nuno Moura da Costa

Instituição
UP-FCUP

2021

ClimateCollab: A collaborative graph for reproducible evidence of climate change

Autor
Lázaro Gabriel Barros da Costa

Instituição
UP-FEUP