Ruud van der Ent

TL;DR: In this article, a community initiative to identify major unsolved scientific problems in hydrology motivated by a need for stronger harmonisation of research efforts is described. But despite the diversity of the participants (230 scientists in total), the process revealed much about community priorities and the state of our science: a preference for continuity in research questions rather than radical departures or redirections from past and current work.

TL;DR: In this article, the authors estimate that more than 1000 rivers account for 80% of global annual emissions, which range between 0.8 million and 2.7 million metric tons per year, with small urban rivers among the most polluting.

TL;DR: PCR-GLOBWB 2 as discussed by the authors is a global hydrology and water resources model with a modular structure, allowing for easier replacement, maintenance, and development of model components.

TL;DR: In this paper, the authors revisited the knowledge on the residence time of water in the atmosphere and derived a global average residence time based on state-of-the-art data of the hydrological cycle.

TL;DR: The water accounting and vulnerability evaluation (WAVE) model is introduced, which can help to interpret volumetric water footprint figures and, thus, promotes a sustainable use of global freshwater resources.