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This special issue of DIE ERDE presents selected key topics discussed within the BBAW working group, including work by group members and invited external researchers, containing nine articles highlighting “Regional Water Challenges” resulting from different kinds of environmental and social changes. We aim to present the complexity of interaction between changes and responses. While the first four articles focus on describing climatic and hydrological changes and their causes, the following five articles focus more on possible mitigation and adaptation measures.
This special issue of DIE ERDE presents selected key topics discussed within the BBAW working group, including work by group members and invited external researchers, containing nine articles highlighting “Regional Water Challenges” resulting from different kinds of environmental and social changes. We aim to present the complexity of interaction between changes and responses. While the first four articles focus on describing climatic and hydrological changes and their causes, the following five articles focus more on possible mitigation and adaptation measures.
This special issue of DIE ERDE presents selected key topics discussed within the BBAW working group, including work by group members and invited external researchers, containing nine articles highlighting “Regional Water Challenges” resulting from different kinds of environmental and social changes. We aim to present the complexity of interaction between changes and responses. While the first four articles focus on describing climatic and hydrological changes and their causes, the following five articles focus more on possible mitigation and adaptation measures.
The present study explores whether regional water resources can be used more efficiently by Brandenburg’s farming systems. A description of agriculture in Brandenburg today is followed by a systematic analysis of measures to raise the water efficiency. Brandenburg’s agricultural systems are divided into three sections: soil, plant production and livestock farming. Within these sections measures to increase water efficiency are listed and analysed with reference to five objective criteria for raising water use efficiency. In view of the complexity of farming systems in Brandenburg, general measures to raise water use efficiency could not be derived. Site-specific tillage practices and crop patterns adjusted to recent weather conditions may reflect the specific diversity of Brandenburg more efficiently.
For decades, water resources have been used intensively for drinking water, industry, agriculture and energy production. This paper summarises the main anthropogenic influences on the water cycle in a Pleistocene landscape and associated geochemical reactions. The results allow the identification and description of the main hydraulic and geochemical processes that control water and solute fluxes in different hydrological compartments, in particular recharge and discharge regions. Under progressive climate change, this process-based knowledge should be used to adapt land and water management to minimise negative impacts on hydrological resources and stabilise the regional water balance in theBerlin-Brandenburg Pleistocene landscape. Based on these results, a risk assessment approach for validation of future management strategies under changing climate conditions is presented.
In Lower Lusatia, eastern Germany, the changing impacts of lignite coal mining and potential climate change have put the naturally low water yield conditions under pressure. Water resources balances describe the hydrological situation in the region and the need for action due to changing boundary conditions. Extended transfer of flood water from neighbouring catchments is considered inevitable for sustainable regional development and the establishment of a quantitatively and qualitatively selfregulated water system. Using the river basin management system WBalMo®, potential water transfer scenarios to compensate for water deficits resulting from regional and global change are analysed.
Die Frage, ob die Landwirtschaft in einer Region Globalisierungseffekten ausgesetzt ist, ist von den Eigenschaften vieler Transaktionen im Agrarsektor her gesehen naheliegend. Landwirtschaftliche und gärtnerische Produkte sind weitgehend Massengüter, die sich profitabel über große Distanzen handeln lassen. Auch landwirtschaftliche Produktionsfaktoren – soweit sie nicht zu den standortgebundenen natürlichen Ressourcen wie Wasser und Boden gehören – sind international mobil, wie der Landmaschinenhandel und auch die starken Migrationsströme landwirtschaftlicher Arbeitskräfte belegen. Ereignisse mit globalen Auswirkungen auf die Nahrungsmittel- und Energiebereitstellung wie Trockenheit, Missernten, Naturkatastrophen, Energieverknappung, Wirtschaftskrisen, (Bürger-)Kriege und anthropogene Ressourcendegradierung können daher die Bedingungen der Agrarproduktion lokal und regional mehr oder weniger stark beeinträchtigen und bilden u.a. eine Quelle der Unsicherheit für die regionale Landwirtschaft. Da gerade der Umgang mit Unsicherheit eine der größten Herausforderungen unternehmerischer Tätigkeit ist, ist der Wunsch nach Abschottung von Globalisierungseffekten erklärbar. Hieraus ergeben sich zwei Leitfragen für diesen Beitrag (siehe auch Hagedorn 2011): 1. Ist die Landwirtschaft in Brandenburg tatsächlich nennenswerten und konkreten Globalisierungseffekten ausgesetzt? Dies soll anhand von wirtschaftlich relevanten Beispielen erkundet werden. 2. Kann sich die brandenburgische Landwirtschaft in einem größeren Maße der Globalisierung entziehen? Gemeint sind damit Optionen, die über globalisierungsgeschützte Nischen hinausgehen.
In diesem Buch werden die von globalen Veränderungen ausgehenden regionalen Auswirkungen betrachtet. Dabei wurde der Fokus auf die Ressource Wasser und die Region Berlin-Brandenburg gelegt. Von den regionalen Herausforderungen des globalen Wandels werden Fragen nach möglichen Anpassungsstrategien und Handlungsorientierungen abgeleitet. Anpassungen werden damit nicht als bloße Reaktion auf einen „unvermeidlichen Wandel“ verstanden. Vor dem Hintergrund unsicherer zukünftiger Entwicklungen hinsichtlich der Art und Intensität der Auswirkungen globaler Veränderungen können Anpassungsstrategien immer nur eine Vorbereitung, Flexibilisierung und Öffnung bestehender Systeme für künftige Herausforderungen bedeuten. In diesem Sinne wird hier „angepasst sein“ verstanden als „befähigt sein, rechtzeitig auf Veränderungen zu reagieren“. Der globale Wandel verläuft räumlich differenziert. Heterogen sind auch die spezifischen Ausgangsbedingungen innerhalb von Regionen, weshalb sich die Auswirkungen des globalen Wandels unterschiedlich ausprägen. Im Folgenden werden die administrative Gliederung der Fokusregion, die aktuelle naturräumliche Ausstattung und Landnutzungen sowie die gegenwärtige raumstrukturelle Situation beschrieben.
Global climate change and aspects of regional climate change in the Berlin-Brandenburg region
(2011)
To obtain an estimate of the average temperature of the northern hemisphere during the last 1200 years, proxy data have been merged with instrumental recordings. These instrumental measurements are, with a few exceptions, only available for the recent 150 years. In the city of Berlin the temperature has been recorded since as early as 1701. However, during the first 150 years the measurements were problematic as location, measurement procedure and instruments changed frequently and without proper documentation. From 1847 onwards observations became more reliable once the Royal Prussian Meteorological Institute had been established. For the last 100 years temperature and precipitation measurements have been performed in parallel at Berlin-Dahlem and Potsdam. The datasets recorded in the city of Berlin and in Berlin-Dahlem have been merged to obtain a record of more than 300 years. It indicates that the temperature of Berlin has risen by 1.04°C during the last 100 years after correcting for the urbanisation effect. In the same period, the total number of frost days has significantly decreased by almost 17 days, and the number of summer days has significantly increased by about 12 days. Annual mean precipitation has hardly changed (decrease less than 0.2 %) during the last century. However, rainfall has decreased by about 4 % in summer and increased by 3 % in winter. All precipitation changes are below the 95 % ignificance level. Model projections indicate that warming will continue which means that Berlin-Brandenburg will experience a temperature rise of about 3-3.5°C by the end of this century for the IPCC scenario A1B. For the same scenario precipitation is expected to increase by 10-20 % in winter and to decrease by 10-30 % in summer: The seasonal precipitation changes compensate each other resulting in an almost unchanged annual mean.