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- Wendisch, M., et al.
(author)
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Atmospheric and Surface Processes, and Feedback Mechanisms Determining Arctic Amplification: A Review of First Results and Prospects of the (AC)(3) Project
- 2023
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In: Bulletin of the American Meteorological Society. - : American Meteorological Society. - 0003-0007 .- 1520-0477. ; 104:1
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Journal article (peer-reviewed)abstract
- Mechanisms behind the phenomenon of Arctic amplification are widely discussed. To contribute to this debate, the (AC)(3) project was established in 2016 (www.ac3-tr.de/). It comprises modeling and data analysis efforts as well as observational elements. The project has assembled a wealth of ground-based, airborne, shipborne, and satellite data of physical, chemical, and meteorological properties of the Arctic atmosphere, cryosphere, and upper ocean that are available for the Arctic climate research community. Short-term changes and indications of long-term trends in Arctic climate parameters have been detected using existing and new data. For example, a distinct atmospheric moistening, an increase of regional storm activities, an amplified winter warming in the Svalbard and North Pole regions, and a decrease of sea ice thickness in the Fram Strait and of snow depth on sea ice have been identified. A positive trend of tropospheric bromine monoxide (BrO) column densities during polar spring was verified. Local marine/biogenic sources for cloud condensation nuclei and ice nucleating particles were found. Atmospheric-ocean and radiative transfer models were advanced by applying new parameterizations of surface albedo, cloud droplet activation, convective plumes and related processes over leads, and turbulent transfer coefficients for stable surface layers. Four modes of the surface radiative energy budget were explored and reproduced by simulations. To advance the future synthesis of the results, cross-cutting activities are being developed aiming to answer key questions in four focus areas: lapse rate feedback, surface processes, Arctic mixed-phase clouds, and airmass transport and transformation.
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| 3. |
- Krampe, Florian, 1980-, et al.
(author)
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Security implications of climate development in conflict-affected states : Implications of local-level effects of rural hydropower development on farmers in Herat
- 2021
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In: Political Geography. - : Elsevier BV. - 0962-6298 .- 1873-5096. ; 90
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Journal article (peer-reviewed)abstract
- Development initiatives aimed at mitigating or adapting to climate change impacts may result in unanticipated effects especially in conflict-affected contexts. To improved understanding of the implications of future climate development projects in conflict-affected states, this article qualitatively examines the experiences of local communities in the Zinda Jan district, located downstream from the Salma Dam in Herat Province, Afghanistan. Conducted in 2018, the research questions what local-level side effects (LLSEs) were experienced by communities downstream of the Salma Dam after its 2016 inauguration, and how these LLSEs might affect the potential for sustainable peace. The article builds from 25 in-depth interviews with local stakeholders in the Zinda Jan district, and highlights how communities generally experienced increased water scarcity after the completion of the dam in 2016, due to poor water management and lack of necessary infrastructure related to the dam. This water scarcity was a factor in grievances related to water access among local communities, and increased the likelihood of related communal violence. However, local perspectives also indicate desire for joint management of water resources between the state and civilians, from the source to their farms. The article provides important insight for research and policy actors to better understand the implications of future climate development projects in conflict-affected states, and their inherent contribution and/or risk to broader peace processes.
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| 4. |
- Pistocchi, A., et al.
(author)
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Treatment of micropollutants in wastewater : Balancing effectiveness, costs and implications
- 2022
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In: Science of the Total Environment. - : Elsevier BV. - 0048-9697. ; 850
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Journal article (peer-reviewed)abstract
- In this contribution, we analyse scenarios of advanced wastewater treatment for the removal of micropollutants. By this we refer to current mainstream, broad spectrum processes including ozonation and sorption onto activated carbon. We argue that advanced treatment requires properly implemented tertiary (nutrient removal) treatment in order to be effective. We review the critical aspects of the main advanced treatment options, their advantages and disadvantages. We propose a quantification of the costs of implementing advanced treatment, as well as upgrading plants from secondary to tertiary treatment when needed, and we illustrate what drives the costs of advanced treatment for a set of standard configurations. We propose a cost function to represent the total costs (investment, operation and maintenance) of advanced treatment. We quantify the implications of advanced treatment in terms of greenhouse gas emissions. Based on the indicators of total toxic discharge, toxicity at the discharge points and toxicity across the stream network discussed in Pistocchi et al. (2022), we compare costs and effectiveness of different scenarios of advanced treatment. In principle the total toxic load and toxicity at the points of discharge could be reduced by about 75 % if advanced treatment processes were implemented virtually at all wastewater treatment plants, but this would entail costs of about 4 billion euro/year for the European Union as a whole. We consider a “compromise” scenario where advanced treatment is required at plants of 100 thousand population equivalents (PE) or larger, or at plants between 10 and 100 thousand PE if the dilution ratio at the discharge point is 10 or less. Under this scenario, the length of the stream network exposed to high toxicity would not increase significantly compared to the previous scenario, and the other indicators would not deteriorate significantly, while the costs would remain at about 1.5 billion Euro/year. Arguably, costs could be further reduced, without a worsening of water quality, if we replace a local risk assessment to generic criteria of plant capacity and dilution in order to determine if a WWTP requires advanced treatment.
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