Person:
González Alemán, Juan Jesús

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First Name
Juan Jesús
Last Name
González Alemán
URI
https://hdl.handle.net/20.500.14352/87048
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Físicas
Department
Física de la Tierra y Astrofísica
Area
Física de la Tierra
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2015 - 20192
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End date: 2019 × Start date: 2010 ×

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Now showing 1 - 2 of 2
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    Cyclones with tropical characteristics over the northeastern Atlantic and Mediterranean sea: analysis in present climate and future projections
    (2019) González Alemán, Juan Jesús; Gaertner Ruiz-Valdepeñas, Miguel Ángel; Gallardo Andrés, Clemente
    Cyclones with tropical characteristics are low pressure systems showing characteristics of both baroclinic (extratropical) and diabatic (tropical) cyclones. Thus, they are within the continuum between the theoretical conceptual extreme of cyclones. Examples of these hybrid cyclones are subtropical cyclones (STCs) forming in the North Atlantic and medicanes of tropical likecyclones in the Mediterranean Sea.The scientific and forecasting community has recently focus on them due to their recognitionas weather damaging systems. They are associated with uncertainties and their relationship with climate change is not very well understood yet. Especially in the northeastern Atlantic (ENA) there is little knowledge of them. Therefore, this thesis aims to add further insight into their characteristics on both present and future climate in Anthropogenic Climate Change (ACC) context, with an additional evaluation of the tools that can be used for studying them in both climates...
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    Classification and Synoptic Analysis of Subtropical Cyclones within the Northeastern Atlantic Ocean
    (Journal of climate, 2015) González Alemán, Juan Jesús; Valero Rodríguez, Francisco; Martín León, Francisco; Evans, Jenni L.
    Since more research is needed on subtropical cyclones (STCs) formed within the North Atlantic eastern basin, this survey analyzes them from a synoptic point of view, on a climatological basis, with the main aims of studying their common features, complementing other studies of these storms in the North Atlantic, and aiding the forecasting community. Fifteen cases of STCs were identified during the period 1979-2011 by applying a set of criteria from two databases. Composite analysis reveals that an extratropical depression acts as a precursor when it is isolated from the westerlies and then suffers a deepening when becoming subtropical instead of decaying through occlusion. This process is accompanied by an atmospheric circulation, within the North Atlantic, whose main feature is characterized by notable departures from the climatological pattern with a statistically significant anomalous high pressure to the north of the STCs. Three conceptual models of synoptic pattern of subtropical cyclogenesis are derived and show that these departures appeared because the westerly circulation moves poleward and/ or the flow has a great meridional component, with the possibility of a blocked flow pattern occurring. Moreover, the identified STCs predominantly formed in a highly sheared (>10 m s^-1) environment with low sea surface temperature values (<25 degrees C), which differs from the dominant features of STCs in the North Atlantic, especially within its western region. Finally, a recent (2010) STC, identified by the authors, is synoptically discussed in order to achieve a better interpretation of the general results.