Internationale Rundfunkanstalten richten ihren Fokus vermehrt auf die Programmgestaltung im Internet, Kurzwellenprogramme hingegen werden reduziert. Trotz des Vormarschs des Internets ist die Kurzwelle ein Instrument, das es derzeit noch mehr als das Internet ermöglicht, Menschen in entlegenen Gebieten zu erreichen. Ist das Radio ein Relikt längst vergangener Zeiten oder spielt es doch noch eine Rolle für den Auslandsrundfunk? Steckt in Audioformaten das Potenzial zum globalen Dialog? Welchen Mehrwert haben Bildungsformate im Audioformat? Wie ermöglichen Audioformate alternativen Stimmen in restriktiven Regimen Gehör zu finden? Der Autor vertieft im vorliegenden Artikel die Frage nach der Rolle des Radios im interkulturellen Dialog in Zeiten von Web 2.0.
Radio and online audio-formats are valuable instruments for international cultural work, and for education and development programmes. However, political developments following the end of the Cold War and the rise of satellite TV and online media have brought with them far-reaching cuts in the radio programming of international broadcasters, and led to fundamental changes in the way radio and audio programmes are produced and distributed. Major western broadcasters, such as BBC World Service, BBG, RFI and DW, have limited their shortwave services to a small selection of countries, mainly in Africa and parts of Asia, where the infrastructure does not offer real alternatives for addressing the respective target groups. In these regions, radio still plays a vital role, not only for reasons related to infrastructure, but also because a great number of illiterate listeners can access information, knowledge and education best via audio. Traditional radio production and terrestrial transmission are also useful and efficient tools in media development work, as they can reach out into remote or rural areas and empower people to strengthen their community and cultural identity. But radio's relevance goes beyond the local needs of regions that have not kept pace with the rate of recent technological change and media innovation. Radio has been at the core of international broadcasting right from the start, and now that it has become one element in a new mix of media, it turns out that there are some attractive core qualities of radio and audio that remain. These qualities are: 1. the direct and emotional impact of the human voice, 2. radio's well-established culture of dialogue, 3. its potential to involve listeners as coproducers, 4. the flexibility, mobility and comparatively low production costs of audio, 5. its ability to subvert censorship.
Abstract. The weather extremity index (WEI) and the cross-scale WEI (xWEI) are useful for determining the extremeness of precipitation events. Both require the estimation of return periods across different precipitation duration levels. For this purpose, previous studies determined annual precipitation maxima from radar composites in Germany and estimated the parameters of a generalized extreme value (GEV) distribution. Including the year 2021 in the estimation of GEV parameters, the devastating event in July 2021 drops from a rank of first to fourth regarding the WEI compared to all events between 2001 and 2020 but remains the most extreme regarding the xWEI. This emphasizes that it was extreme across multiple spatial and temporal scales and the importance of considering different scales to determine the extremeness of rainfall events.
Decadal prediction systems are designed to become a valuable tool for decision making in different sectors of economy, administration or politics. Progress in decadal predictions is also expected to improve our scientific understanding of the climate system. The German Federal Ministry for Education and Research (BMBF) therefore funds the German national research project MiKlip (Mittelfristige Klimaprognosen). A network of German research institutions contributes to the development of the system by conducting individual research projects. This special issue presents a collection of papers with results of the evaluation activities within the first phase of MiKlip. They document the improvements of the MiKlip decadal prediction system which were achieved during the first phase. Key aspects are the role of initialization strategies, model resolution or ensemble size. Additional topics are the evaluation of specific weather parameters in selected regions and the use of specific observational datasets for the evaluation.
Abstract. Extreme precipitation is a weather phenomenon with tremendous damaging potential for property and human life. As the intensity and frequency of such events is projected to increase in a warming climate, there is an urgent need to advance the existing knowledge on extreme precipitation processes, statistics and impacts across scales. To this end, a working group within the Germany-based project, ClimXtreme, has been established to carry out multidisciplinary analyses of high-impact events. In this work, we provide a comprehensive assessment of the 29 June 2017 heavy precipitation event (HPE) affecting the Berlin metropolitan region (Germany), from the meteorological, impacts and climate perspectives, including climate change attribution. Our analysis showed that this event occurred under the influence of a mid-tropospheric trough over western Europe and two shortwave surface lows over Britain and Poland (Rasmund and Rasmund II), inducing relevant low-level wind convergence along the German–Polish border. Over 11 000 convective cells were triggered, starting early morning 29 June, displacing northwards slowly under the influence of a weak tropospheric flow (10 m s−1 at 500 hPa). The quasi-stationary situation led to totals up to 196 mm d−1, making this event the 29 June most severe in the 1951–2021 climatology, ranked by means of a precipitation-based index. Regarding impacts, it incurred the largest insured losses in the period 2002 to 2017 (EUR 60 million) in the greater Berlin area. We provide further insights on flood attributes (inundation, depth, duration) based on a unique household-level survey data set. The major moisture source for this event was the Alpine–Slovenian region (63 % of identified sources) due to recycling of precipitation falling over that region 1 d earlier. Implementing three different generalised extreme value (GEV) models, we quantified the return periods for this case to be above 100 years for daily aggregated precipitation, and up to 100 and 10 years for 8 and 1 h aggregations, respectively. The conditional attribution demonstrated that warming since the pre-industrial era caused a small but significant increase of 4 % in total precipitation and 10 % for extreme intensities. The possibility that not just greenhouse-gas-induced warming, but also anthropogenic aerosols affected the intensity of precipitation is investigated through aerosol sensitivity experiments. Our multi-disciplinary approach allowed us to relate interconnected aspects of extreme precipitation. For instance, the link between the unique meteorological conditions of this case and its very large return periods, or the extent to which it is attributable to already-observed anthropogenic climate change.
