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Alexandre M. Ramos     Post Doctoral Researcher 
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Alexandre M. Ramos published an article in September 2018.
Top co-authors See all
R. M. Trigo

217 shared publications

Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa; Lisboa Portugal

Raquel Nieto

190 shared publications

EPhysLab (Environmental Physics Laboratory), Facultade de Ciencias, Universidade de Vigo, 32004 Ourense, Spain

Paulo Sousa

161 shared publications

Instituto Dom Luiz, Facultade de Ciências; Universidade de Lisboa; Lisboa Portugal

J. M. Vaquero

144 shared publications

Instituto Universitario de Investigación del Agua, Cambio Climático y Sostenibilidad (IACYS); Universidad de Extremadura; Badajoz Spain

Luis Gimeno

82 shared publications

EPhysLab (Environmental Physics Laboratory), Facultade de Ciencias, Universidade de Vigo, 32004 Ourense, Spain

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19
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Publication Record
Distribution of Articles published per year 
(2014 - 2018)
Publications See all
Article 0 Reads 0 Citations Contribution of Moisture from Mediterranean Sea to Extreme Precipitation Events over Danube River Basin Danica Ciric, Raquel Nieto, Alexandre M. Ramos, Anita Drumon... Published: 04 September 2018
Water, doi: 10.3390/w10091182
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In the most recent decades, central Europe and the Danube River Basin area have been affected by an increase in the frequency and intensity of extreme daily rainfall, which has resulted in the more frequent occurrence of significant flood events. This study characterised the link between moisture from the Mediterranean Sea and extreme precipitation events, with varying lengths that were recorded over the Danube River basin between 1981 and 2015, and ranked the events with respect to the different time scales. The contribution of the Mediterranean Sea to the detected extreme precipitation events was then estimated using the Lagrangian FLEXPART dispersion model. Experiments were modelled in its forward mode, and particles leaving the Mediterranean Sea were tracked for a period of time determined with respect to the length of the extreme event. The top 100 extreme events in the ranking with durations of 1, 3, 5, 7, and 10 days were analysed, and it was revealed that most of these events occurred in the winter. For extreme precipitation, positive anomalies of moisture support from the Mediterranean were found to be in the order of 80% or more, but this support reached 100% in summer and spring. The results show that extreme precipitation events with longer durations are more influenced by the extreme Mediterranean anomalous moisture supply than those with shorter lengths. However, it is during shorter events when the Mediterranean Sea contributes higher amounts of moisture compared with its climatological mean values; for longer events, this contribution decreases progressively (but still doubles the climatological moisture contribution from the Mediterranean Sea). Finally, this analysis provides evidence that the optimum time period for accumulated moisture to be modelled by the Lagrangian model is that for which the extreme event is estimated. In future studies, this fine characterisation could assist in modelling moisture contributions from sources in relation to individual extreme events.
Article 0 Reads 0 Citations Impacts of Atmospheric Rivers in Extreme Precipitation on the European Macaronesian Islands Alexandre M. Ramos, Ricardo M. Trigo, Ricardo Tomé, Margarid... Published: 20 August 2018
Atmosphere, doi: 10.3390/atmos9080325
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The European Macaronesia Archipelagos (Azores, Madeira and Canary Islands) are struck frequently by extreme precipitation events. Here we present a comprehensive assessment on the relationship between atmospheric rivers and extreme precipitation events in these three Atlantic Archipelagos. The relationship between the daily precipitation from the various weather stations located in the different Macaronesia islands and the occurrence of atmospheric rivers (obtained from four different reanalyses datasets) are analysed. It is shown that the atmospheric rivers’ influence over extreme precipitation (above the 90th percentile) is higher in the Azores islands when compared to Madeira or Canary Islands. In Azores, for the most extreme precipitation days, the presence of atmospheric rivers is particularly significant (up to 50%), while for Madeira, the importance of the atmospheric rivers is reduced (between 30% and 40%). For the Canary Islands, the occurrence of atmospheric rivers on extreme precipitation is even lower.
Article 0 Reads 0 Citations Extreme Precipitation Events in Summer in the Iberian Peninsula and Its Relationship With Atmospheric Rivers Alexandre M. Ramos, Maria J. Martins, Ricardo Tomé, Ricardo ... Published: 10 August 2018
Frontiers in Earth Science, doi: 10.3389/feart.2018.00110
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This study identifies and characterizes the importance of the Atmospheric Rivers in the extreme precipitation episodes that strike the Iberian Peninsula and Portugal during the extended summer months (April to September) between 1950 and 2007. The extreme precipitation days are ranked taking into account a daily gridded precipitation database for the Iberian Peninsula at a 0.2° resolution. The ranking is based on the magnitude of the extreme precipitation days considering not only on the area affected above the 95th climatological percentile but also by the precipitation intensity within the anomalous area. The Atmospheric Rivers detection scheme is used for the North Atlantic Ocean basin that allows the identification of the persistent Atmospheric Rivers that impact the Iberian Peninsula for the extended summer months. It is shown, that there is a relationship between the Atmospheric Rivers and the extreme precipitation days in Portugal especially during the transition months of April, May and September. On the contrary when analysing the entire Iberia Peninsula the impact of ARs is considerably reduced. Moreover, the impacts of the Atmospheric Rivers is considerably higher for the top ranked events in Portugal but decreases when considering less intense extreme precipitation days.
Article 3 Reads 3 Citations On the relationship between atmospheric water vapour transport and extra-tropical cyclones development Juan A. Ferreira, Margarida L.R. Liberato, Alexandre M. Ramo... Published: 01 August 2016
Physics and Chemistry of the Earth, Parts A/B/C, doi: 10.1016/j.pce.2016.01.001
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Article 3 Reads 10 Citations Responses of European precipitation distributions and regimes to different blocking locations Pedro M. Sousa, Ricardo M. Trigo, David Barriopedro, Pedro M... Published: 25 April 2016
Climate Dynamics, doi: 10.1007/s00382-016-3132-5
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Article 3 Reads 9 Citations Atmospheric rivers moisture sources from a Lagrangian perspective Alexandre M. Ramos, Raquel Nieto, Ricardo Tomé, Luis Gimeno,... Published: 22 April 2016
Earth System Dynamics, doi: 10.5194/esd-7-371-2016
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An automated atmospheric river (AR) detection algorithm is used for the North Atlantic Ocean basin, allowing the identification of the major ARs affecting western European coasts between 1979 and 2012 over the winter half-year (October to March). The entire western coast of Europe was divided into five domains, namely the Iberian Peninsula (9.75°W, 36–43.75°N), France (4.5°W, 43.75–50°N), UK (4.5°W, 50–59°N), southern Scandinavia and the Netherlands (5.25°E, 50–59°N), and northern Scandinavia (5.25°E, 59–70°N). Following the identification of the main ARs that made landfall in western Europe, a Lagrangian analysis was then applied in order to identify the main areas where the moisture uptake was anomalous and contributed to the ARs reaching each domain. The Lagrangian data set used was obtained from the FLEXPART (FLEXible PARTicle dispersion) model global simulation from 1979 to 2012 and was forced by ERA-Interim reanalysis on a 1° latitude–longitude grid. The results show that, in general, for all regions considered, the major climatological areas for the anomalous moisture uptake extend along the subtropical North Atlantic, from the Florida Peninsula (northward of 20°N) to each sink region, with the nearest coast to each sink region always appearing as a local maximum. In addition, during AR events the Atlantic subtropical source is reinforced and displaced, with a slight northward movement of the sources found when the sink region is positioned at higher latitudes. In conclusion, the results confirm not only the anomalous advection of moisture linked to ARs from subtropical ocean areas but also the existence of a tropical source, together with midlatitude anomaly sources at some locations closer to AR landfalls.
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