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Alexandre M. Ramos     Post Doctoral Researcher 
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Alexandre M. Ramos published an article in August 2016.
Top co-authors See all
José M. Vaquero

87 shared publications

Universidad de Extremadura, Departamente de Física, Mérida, Spain

Luis Gimeno

82 shared publications

Ricardo M. Trigo

62 shared publications

Nicola Cortesi

18 shared publications

Centre Européen de Recherche et de Formación Avancée en Calcul Scientifique, Meteo France, Toulouse, France

Ana Russo

14 shared publications

Instituto Dom Luiz, Universidade de Lisboa, Lisbon, Portugal

10
Publications
5
Reads
0
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41
Citations
Publication Record
Distribution of Articles published per year 
(2014 - 2016)
Total number of journals
published in
 
8
 
Publications See all
Article 1 Read 2 Citations On the relationship between atmospheric water vapour transport and extra-tropical cyclones development Juan Ferreira, Margarida L.R. Liberato, Alexandre M. Ramos 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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Highlights•Model simulation of North-Atlantic extra-tropical cyclones.•Several simulations with varying humidity initial and boundary conditions.•Model is able to simulate the development and the approximate track of the storms.•Dependence of the storms explosive development with atmospheric water vapour content. AbstractIn this study we seek to investigate the role of atmospheric water vapour on the intensification of extra-tropical cyclones over the North Atlantic Ocean and more specifically to investigate the linkage between atmospheric rivers’ conditions leading to the explosive development of extra-tropical cyclones. Several WRF-ARW simulations for three recent extra-tropical storms that had major negative socio-economic impacts in the Iberian Peninsula and south-western Europe (Klaus, 2009; Gong, 2013 and Stephanie, 2014) are performed in which the water vapour content of the initial and boundary conditions are tuned. Analyses of the vertically integrated vapour transport show the dependence of the storms’ development with atmospheric water vapour. In addition, results also show changes in the shape of the jet stream resulting in a reduction of the upper wind divergence, which in turn affects the intensification of the extra-tropical cyclones studied. This study suggests that atmospheric rivers tend to favour the conditions for explosive extra-tropical storms’ development in the three case studies, as simulations performed without the existence of atmospheric rivers produce shallow mid-latitudes cyclones, that is, cyclones that are not so intense as those on the reference simulations.
Article 1 Read 8 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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In this work we performed an analysis on the impacts of blocking episodes on seasonal and annual European precipitation and the associated physical mechanisms. Distinct domains were considered in detail taking into account different blocking center positions spanning between the Atlantic and western Russia. Significant positive precipitation anomalies are found for southernmost areas while generalized negative anomalies (up to 75 % in some areas) occur in large areas of central and northern Europe. This dipole of anomalies is reversed when compared to that observed during episodes of strong zonal flow conditions. We illustrate that the location of the maximum precipitation anomalies follows quite well the longitudinal positioning of the blocking centers and discuss regional and seasonal differences in the precipitation responses. To better understand the precipitation anomalies, we explore the blocking influence on cyclonic activity. The results indicate a split of the storm-tracks north and south of blocking systems, leading to an almost complete reduction of cyclonic centers in northern and central Europe and increases in southern areas, where cyclone frequency doubles during blocking episodes. However, the underlying processes conductive to the precipitation anomalies are distinct between northern and southern European regions, with a significant role of atmospheric instability in southern Europe, and moisture availability as the major driver at higher latitudes. This distinctive underlying process is coherent with the characteristic patterns of latent heat release from the ocean associated with blocked and strong zonal flow patterns. We also analyzed changes in the full range of the precipitation distribution of several regional sectors during blocked and zonal days. Results show that precipitation reductions in the areas under direct blocking influence are driven by a substantial drop in the frequency of moderate rainfall classes. Contrarily, southwards of blocking systems, frequency increases in moderate to extreme rainfall classes largely determine the precipitation anomaly in the accumulated totals. In this context, we show the close relationship between the more intrinsic torrential nature of Mediterranean precipitation regimes and the role of blocking systems in increasing the probability of extreme events.
Article 1 Read 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.
Article 1 Read 5 Citations Ranking of multi-day extreme precipitation events over the Iberian Peninsula Alexandre M. Ramos, Ricardo M. Trigo, Margarida L. R. Libera... Published: 15 April 2016
International Journal of Climatology, doi: 10.1002/joc.4726
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An objective method for ranking extreme precipitation episodes in different time scales over the Iberian Peninsula (IP) is presented. It relies on the extensive use of the high-resolution (0.2°) gridded daily precipitation database available for the IP, spanning from 1950 to 2008. The sum of the normalized anomalies is computed over different time scales (2–10 days) to allow ranking the different anomalous precipitation multi-day periods. The magnitude of a precipitation episode is given taking into account the area (in percentage) that has precipitation anomalies above two standard deviations (std) and the mean values of these anomalies over this area. With these criteria, we are able to evaluate the spatial extent of the precipitation episodes as well as their spatially integrated intensity. Different precipitation rankings are built for the entire IP, for Portugal and independently for six of the major river basins in the IP. The different rankings correctly detect and categorize the most extreme precipitation episodes which occurred on the various domains. For each domain, in general, results show that few events dominate the top ten of a particular ranking; specific extreme events at shorter time scales (e.g. 2–3 days) may be absent from the top rankings at longer time scales (e.g. 10 days). When comparing the different domains, the top ten events are generally different from each other, thus highlighting the spatial variability of extreme precipitation in the IP. Moreover the methodology used to build the rankings imply that some events are considered extreme due to particularly high precipitation totals, while other episodes are more dependent on extensive areas affected by less extreme precipitation values. The different rankings revealed to be an useful tool for future studies in identifying the meteorological impacts of extreme precipitation episodes at the regional scale covering relatively large areas.
Article 1 Read 2 Citations Present and future climate conditions for winegrowing in Spain María N. Lorenzo, Alexandre M. Ramos, Swen Brands Published: 14 November 2015
Regional Environmental Change, doi: 10.1007/s10113-015-0883-1
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Article 0 Reads 2 Citations Circulation weather types as a tool in atmospheric, climate, and environmental research Alexandre M. Ramos, David Barriopedro, Emanuel Dutra Published: 19 June 2015
Frontiers in Environmental Science, doi: 10.3389/fenvs.2015.00044
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