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Browsing HumanISE by Author "6363"
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ItemAmbient radioactivity and atmospheric electric field: A joint study in an urban environment( 2020) Susana Alexandra Barbosa ; 6363Ambient radioactivity and atmospheric electricity are inextricably linked phenomena. In order to assess the role of ambient radioactivity in the local variability of the atmospheric electric field at an urban site, simultaneous measurements of radon concentration, gamma radiation, and atmospheric electric field are carried out in the city of Porto, Portugal. Both radon and gamma radiation display an average daily cycle peaking before sunrise, but with considerable variability from day to day, particularly in amplitude. The atmospheric electric field displays a daily cycle with a minimum at dawn and maximum in the early afternoon, as well as a secondary peak in the early morning. The temporal variation of the daily patterns is analysed by means of an empirical orthogonal function analysis, and related to local meteorological parameters. The variability of the local atmospheric electric field is mainly determined by aerosol transport and accumulation close to the surface associated with local meteorological conditions and atmospheric stability rather than by conductivity variations associated with ambient radioactivity. © 2020 Elsevier Ltd
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ItemAutomatic characterisation of Dansgaard-Oeschger events in palaeoclimate ice records( 2023) Susana Alexandra Barbosa ; Maria Eduarda Silva ; Nuno Dias ; Rousseau,D ; 5567 ; 6363 ; 8707<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&#8217;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>
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ItemDevelopment of a new system for real-time detection of radon using scintillating optical fibers( 2018) Coelho,L ; Diana Filipa Guimarães ; Susana Alexandra Barbosa ; Catarina Silva Monteiro ; 6888 ; 6568 ; 6363A remote sensor for radon continuous measurement using polymeric scintillation optical fibers was developed and evaluated. Successful preliminary results showed detection of natural occurring radon from a container with rocks rich in uranium oxides. © OSA 2018 © 2018 The Author(s)
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ItemExtreme heat events in the Iberia Peninsula from extreme value mixture modeling of ERA5-Land air temperature( 2022) Susana Alexandra Barbosa ; Scotto,MG ; 6363
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ItemGlossary on atmospheric electricity and its effects on biology( 2021) Fdez Arroyabe,P ; Kourtidis,K ; Haldoupis,C ; Savoska,S ; Matthews,J ; Mir,LM ; Kassomenos,P ; Cifra,M ; Susana Alexandra Barbosa ; Chen,XM ; Dragovic,S ; Consoulas,C ; Hunting,ER ; Robert,D ; van der Velde,OA ; Apollonio,F ; Odzimek,A ; Chilingarian,A ; Roye,D ; Mkrtchyan,H ; Price,C ; Bor,J ; Oikonomou,C ; Birsan,MV ; Crespo Facorro,B ; Djordjevic,M ; Salcines,C ; Lopez Jimenez,A ; Donner,RV ; Vana,M ; Pedersen,JOP ; Vorenhout,M ; Rycroft,M ; 6363
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ItemThe Impact of Atmospheric and Tectonic Constraints on Radon-222 and Carbon Dioxide Flow in Geological Porous Media - A Dozen-Year Research Summary( 2020) Zafrir,H ; Susana Alexandra Barbosa ; Levintal,E ; Weisbrod,N ; Ben Horin,Y ; Zalevsky,Z ; 6363
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ItemMorphological controls and statistical modelling of boulder transport by extreme storms( 2020) Oliveira,MA ; Scotto,MG ; Susana Alexandra Barbosa ; de Andrade,CF ; Freitas,MD ; 6363
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ItemNew metrology for radon at the environmental level( 2021) Röttger,A ; Röttger,S ; Grossi,C ; Vargas,A ; Curcoll,R ; Otáhal,P ; Hernández Ceballos,MÁ ; Cinelli,G ; Chambers,S ; Susana Alexandra Barbosa ; Ioan,MR ; Radulescu,I ; Kikaj,D ; Chung,E ; Arnold,T ; Yver Kwok,C ; Fuente,M ; Mertes,F ; Morosh,V ; 6363
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ItemRotação da Terra e duração do dia( 2021) Mendes,V ; Susana Alexandra Barbosa ; 6363
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ItemThe Structure of Climate Variability Across Scales( 2020) Franzke,CLE ; Susana Alexandra Barbosa ; Blender,R ; Fredriksen,HB ; Laepple,T ; Lambert,F ; Nilsen,T ; Rypdal,K ; Rypdal,M ; Scotto,MG ; Vannitsem,S ; Watkins,NW ; Yang,LC ; Yuan,NM ; 6363
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ItemVariabilidade de alta frequência do radão num ambiente interior estável( 2018) Susana Alexandra Barbosa ; et. al., ; 6363
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ItemVertical land motion in the Iberian Atlantic coast and its implications for sea level change evaluation( 2020) Mendes,VB ; Susana Alexandra Barbosa ; Carinhas,D ; 6363In this study, we estimate vertical land motion for 35 stations primarily located along the coastline of Portugal and Spain, using GPS time series with at least eight years of observations. Based on this set of GPS stations, our results show that vertical land motion along the Iberian coastline is characterized, in general, by a low to moderate subsidence, ranging from -2.2 mm yr(-1) to 0.4 mm yr(-1), partially explained by the glacial isostatic adjustment geophysical signal. The estimates of vertical land motion are subsequently applied in the analysis of tide gauge records and compared with geocentric estimates of sea level change. Geocentric sea level for the Iberian Atlantic coast determined from satellite altimetry for the last three decades has a mean of 2.5 /- 0.6 mm yr(-1), with a significant range, as seen for a subset of grid points located in the vicinity of tide gauge stations, which present trends varying from 1.5 mm yr(-1) to 3.2 mm yr(-1). Relative sea level determined from tide gauges for this region shows a high degree of spatial variability, that can be partially explained not only by the difference in length and quality of the time series, but also for possible undocumented datum shifts, turning some trends unreliable. In general, tide gauges corrected for vertical land motion produce smaller trends than satellite altimetry. Tide gauge trends for the last three decades not corrected for vertical land motion range from 0.3 mm yr(-1) to 5.0 mm yr(-1) with a mean of 2.6 /- 1.4 mm yr(-1), similar to that obtained from satellite altimetry. When corrected for vertical land motion, we observe a reduction of the mean to E1.9 /- 1.4 mm yr(-1). Actions to improve our knowledge of vertical land motion using space geodesy, such as establishing stations in co-location with tide gauges, will contribute to better evaluate sea level change and its impacts on coastal regions.