The characterization and quantification of hydrological fluxes within components of the water cycle and across interfaces (e.g., atmosphere/land surface, aquifer/river, soil/plant) are critical for assessing and managing water resources and for understanding the impacts of climate change and variability on the hydrological cycle. Stable isotopes of oxygen and hydrogen, and radioactive isotopes such as tritium and carbon‐14, provide unique insights into hydrological and climatic processes at local, regional, and global scales, including the role of groundwater in rivers and lakes, groundwater recharge rates, and sources and recycling rates of atmospheric moisture [Aggarwal et al., 2005; Gat, 1996; Kendall and McDonnell, 1998]. Isotopes also provide critical insights into understanding feedbacks and interactions between physical and biological processes (e.g., ecohydrology).

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health sciences, history THE CANADIAN HISTORICAL REVIEW utpjournals.press/chr Offering a comprehensive analysis on the events that have shaped Canada, CHR publishes articles that examine Canadian history from both a multicultural and multidisciplinary perspective.

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Abstract. Open data and geospatial data collected by volunteers are nowadays easy to obtain and available with worldwide coverage through projects like OpenStreetMap. However, the use of these datasets leads to new challenges in depiction especially in the field of large scale topographic cartography. In addition to quality research, new processing and depiction methods for integrating these data are emerging. In the course of this work, specific problems of maps based on OpenStreetMap and Open Data elevation models are pointed out and possible solutions are introduced. In addition, a method for the preprocessing of contour lines is presented and the process flow is described in more detail. The goal of this work is to give insight into a toolbox of specially adapted and (semi-)automated methods. In this way, the quality standard of the depiction of topographic maps based on Open Data is to be increased, but also limitations are being shown.