Phosphorus loadings to the world's largest lakes: sources and trends

Eutrophication is a major water quality issue in lakes worldwide and is principally caused by the loadings of phosphorus from catchment areas. It follows that to develop strategies to mitigate eutrophication, we must have a good understanding of the amount, sources, and trends of phosphorus pollution. This paper provides the first consistent and harmonious estimates of current phosphorus loadings to the world's largest 100 lakes, along with the sources of these loadings and their trends. These estimates provide a perspective on the extent of lake eutrophication worldwide, as well as potential input to the evaluation and management of eutrophication in these lakes. We take a modeling approach and apply the WorldQual model for these estimates. The advantage of this approach is that it allows us to fill in large gaps in observational data. From the analysis, we find that about 66 of the 100 lakes are located in developing countries and their catchments have a much larger average phosphorus yield than the lake catchments in developed countries (11.1 versus 0.7 kg TP km−2 year−1). Second, the main source of phosphorus to the examined lakes is inorganic fertilizer (47% of total). Third, between 2005–2010 and 1990–1994, phosphorus pollution increased at 50 out of 100 lakes. Sixty percent of lakes with increasing pollution are in developing countries. P pollution changed primarily due to changing P fertilizer use. In conclusion, we show that the risk of P‐stimulated eutrophication is higher in developing countries

Identification of user requirements for an energy scenario database

Energy scenarios assist decision making regarding the transformation of the energy supply system. A multitude of scenarios exists in various formats. Thus, for scientists and policy stakeholders alike, it remains difficult to distinguish and compare scenario data. Hence, the aim of the project SzenarienDB is to establish an energy scenario database containing data in comparable and machine-readable format. SzenarienDB will do so by extending the OpenEnergyPlatform (OEP). To ensure that the extension fulfils the requirements of the modelling community, we conducted an online survey. We asked the participants about what they expected of an energy scenario database. Along with input from expert meetings and GitHub issues on that topic, we derived user requirement from the answers. In total, we identified 69 requirements. Out of these, around 44% were considered as very urgent. Hence, we conclude that there is a great need for the development of a consistent energy scenario database. To tackle the requirements we grouped these into twelve categories: input and output, data review process, bug-fixes, documentation, factsheets, features, functions to modify data, layout, metadata, ontology, references, and other. Each category is resolved according to its intrinsic properties

Deutschland auf dem Weg zur Klimaneutralität 2045 - Szenarien und Pfade im Modellvergleich (Zusammenfassung)

Erstmals stellt die vorliegende Szenarienanalyse für Deutschland konkreteTransformationspfade zur Klimaneutralität 2045 auf der Basis eines umfassenden Modellvergleichs vor. Das Besondere an dieser Studie des Ariadne-Projektes ist, dass sechs Gesamtsystem- und Sek-tormodelle in einer Studie integriert wurden, die sich in ihren jeweiligen Stärken ergänzen: Für spezifische Fragestellungen wurde jeweils dasjenige Modell als Leitmodell hervorgehoben, welches die entsprechenden Aspekte am genauesten abbildet. Weitere Modelle wurden genutzt, um Auswirkungen der Transformation auf Umweltschutzgüter und die Verteilung der Kosten auf verschiedene Einkommensgruppen zu analysieren.Dieser breit gefächerte Ansatz ermöglicht es, die Implikationen der Energiewende robust und im Detail zu beschreiben

Modeled monthly surface water concentrations of fecal coliform bacteria, biochemical oxygen demand, and total dissolved solids in Asia, Africa, and Latin America in the period 1990-2010.

These datasets contain modeled monthly mean loadings and concentrations of faecal coliform bacteria (FC), biochemical oxygen demand (BOD), and total dissolved solids (TDS) in river networks of Asia, Africa, and Latin America for the periods 1990-1992 and 2008-2010. These loadings and concentrations were estimated with WorldQual (part of the WaterGAP3 modeling framework) on a 5 arc-min resolution grid. These datasets were elaborated as part of the project “The world's water quality: A pre-study for a worldwide assessment” for which funding was provided by the United Nations Environmental Programme (UNEP) and UN-Water. The datasets are supplementary for the manuscript mentioned in the reference

Reference concentrations of biochemical oxygen demand (BOD), faecal coliform bacteria (FC), and total dissolved solids (TDS) from published literature sources used for model validation

The attached table contains source information and measured concentrations of faecal coliform bacteria (FC), biochemical oxygen demand (BOD), and total dissolved solids (TDS). These measurements come from published literature and constitute supplementary information for the manuscript mentioned in the reference (in this context, the data was used for model validation and testing). This dataset was used for the project “The world's water quality: A pre-study for a worldwide assessment” for which funding was provided by the United Nations Environmental Programme (UNEP) and UN-Water