105 research outputs found

    Etude potentiom

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    Transnational conflict in Africa

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    Introducing the transnational conflict in Africa dataset

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    This occasional paper is the counterpart to the paper, ‘Redescribing Transnational Conflict in Africa’ (Twagiramungu et al. 2019). It introduces the transnational conflict in Africa (TCA) dataset, which can be used to study the neglected transnational dimensions of armed conflicts in Africa. The TCA dataset is built by combining, augmenting, and revising several existing datasets, each of which captures some elements of transnational conflict, including interstate wars, external state support in interstate wars, low-intensity confrontations between states, external interventions in civil wars, and external support to rebels or coup-makers. The methodology underlying the TCA is explained and some descriptive statistics concerning the dimensions of transnational conflict in Africa are presented. The final section discusses some challenges and concludes that the conventional wisdom that Africa has experienced little interstate conflict is misleading. In order to fully explain the internationality of wars in Africa, including so-called ‘civil wars’ as well as other forms of political violence such as military coups, one needs to look at regional and interstate dynamics, as opposed to solely dynamics within a country

    Dominant atmospheric circulation patterns associated with abnormal rainfall events over Rwanda, East Africa

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    The study investigated the dominant atmospheric circulation patterns associated with abnormal rainfall over Rwanda during the March–May (MAM) rainfall season in 1981–2010. The data sets used in this study include: rainfall, wind, sea surface temperature (SST), and humidity. Correlation and composite analysis and Percent of Normal Index (PNI) were deployed in this study. In the wet years (1987, 1988, and 1998), the country was dominated by moisture convergence, which is in line with wind anomalies that exhibits strong westerly winds from the Atlantic Ocean and southeasterly winds originated from the Indian Ocean. These winds carry moist air mass passing over Congo to the study area, leading to wet events. On the other hand, easterly winds were noted over the study area during the dry years (1984, 2000, 2007, and 2008). The observed wet years coincided with the El Niño events, while the dry years are noted during the La Niña episodes. The dry years exhibited a wide spread of moisture divergence anomaly at the low level and were characterized by the sinking motion as opposed to the wet years with the rising motion. The anomalies of velocity potential/divergence further showed that the wet (dry) years were characterized by convergence (divergence) at the low level. The results also show that there exists a low positive correlation between mean MAM rainfall and SST over the Indian Ocean, which shows minimum influence of the Ocean. On the other hand, it was noted that rainfall amounts is significantly correlated at 95% confidence level with the elevation (altitude) of a given station. This study improves the understanding of the occurrence of wet and dry events in Rwanda, which is helpful in future monitoring of these events
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