Storage dynamics in hydropedological units control hillslope connectivity, runoff generation, and the evolution of catchment transit time distributions

Acknowledgments We thank the European Research Council (ERC; project GA 335910 VEWA) and Natural Environment Research Council (NERC; project NE/K000268/1) for funding. We would like to thank Konrad Piegat for invaluable help with the fieldwork. Iain Malcolm and staff at Marine Scotland (Pitlochry) are also thanked for the provision of data from the AWS. We also thank three anonymous reviewers for their constructive comments.Peer reviewedPublisher PD

Using SAS functions and high resolution isotope data to unravel travel time distributions in headwater catchments

Acknowledgments. We are grateful to the European Research Council (ERC) VeWa project (GA335910) and NERC/JIP SIWA project (NE/MO19896/1) for funding. A.R. acknowledges the financial support from the ENAC school at EPFL. C.B. acknowledges support from the University of Costa Rica (project 217-B4-239 and the Isotope Network for Tropical Ecosystem Studies (ISONet)). Data to support this study are provided by the Northern Rivers Institute, University of Aberdeen and are available by the authors. The authors wish to thank Ype van der Velde, Arash Massoudieh, Jean-Raynald de Dreuzy and an anonymous referee for the useful review comments.Peer reviewedPublisher PD

Using high resolution isotope data and alternative calibration strategies for a tracer-aided runoff model in a nested catchment

Acknowledgements The authors would like to thank Jonathan Dick and Audrey Innes for lab analysis and preparation of the isotope samples. In addition, we would like to thank Iain Malcolm (Marine Scotland Science) for providing AWS data. Finally, we gratefully acknowledge the European Research Council ERC (project GA 335910 VeWa) for funding the VeWa project. The data used are available from the authors. CB acknowledges support from the University of Costa Rica (project 217-B4-239 and the Isotope Network for Tropical Ecosystem Studies (ISONet)).Peer reviewedPostprin

Assessing land use effects on ecohydrological partitioning in the critical zone through isotope-aided modelling

Research Funding Bundesministerium für Bildung und Forschung. Grant Numbers: 033W034A, 16LW0156 Leibniz Association Einstein Foundation Berlin Einstein Stiftung Berlin. Grant Number: ERU-2020- 609 Leverhulme Trust Article Funding Open Access funding enabled and organized by Projekt DEAL.Peer reviewedPublisher PD

Assessing land use influences on isotopic variability and stream water ages in urbanising rural catchments

Funding This work was supported by the Leverhulme Trust under Grant RPG-2018-375. Acknowledgements We are grateful to the Leverhulme ISOLAND project (RPG-2018-375) for funding and we are especially grateful to Dr A. Neill for his assistance with the creation of Figure 4.Peer reviewedPublisher PD

A simple topography-driven and calibration-free runoff generation module

This study was supported by National Natural Science Foundation of China (41801036), National Key R&D Program of China (2017YFE0100700), the Key Program of National Natural Science Foundation of China (no. 41730646), and Key Laboratory for Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (KLMHESP-17-02). The authors acknowledge three anonymous reviewers for their very constructive comments and suggestions that substantially improved the quality of this paper.Peer reviewedPublisher PD

Continuous in situ measurements of water stable isotopes in soils, tree trunk and root xylem: Field approval

Rationale New methods to measure stable isotopes of soil and tree water directly in the field enable us to increase the temporal resolution of obtained data and advance our knowledge on the dynamics of soil and plant water fluxes. Only few field applications exist. However, these are needed to further improve novel methods and hence exploit their full potential. Methods We tested the borehole equilibration method in the field and collected in situ and destructive samples of stable isotopes of soil, trunk and root xylem water over a 2.5-month experiment in a tropical dry forest under natural abundance conditions and following labelled irrigation. Water from destructive samples was extracted using cryogenic vacuum extraction. Isotope ratios were determined with IRIS instruments using cavity ring-down spectroscopy both in the field and in the laboratory. Results In general, timelines of both methods agreed well for both soil and xylem samples. Irrigation labelled with heavy hydrogen isotopes clearly impacted the isotope composition of soil water and one of the two studied tree species. Inter-method deviations increased in consequence of labelling, which revealed their different capabilities to cover spatial and temporal heterogeneities. Conclusions We applied the novel borehole equilibration method in a remote field location. Our experiment reinforced the potential of this in situ method for measuring xylem water isotopes in both tree trunks and roots and confirmed the reliability of gas permeable soil probes. However, in situ xylem measurements should be further developed to reduce the uncertainty within the range of natural abundance and hence enable their full potential

Water sources and mixing in riparian wetlands revealed by tracers and geospatial analysis

Acknowledgments We thank the European Research Council (ERC) (project GA 335910 VEWA) and Natural Environment Research Council (NERC) (project NE/K000268/1) for funding and the Airborne Research and Survey Facility for conducting the aerial survey. The data used are available from the authors. In addition, we would like to thank the additional support from Audrey Innes for the sample analysis and Maria Blumstock and Mike Kennedy for assisting with field work.Peer reviewedPublisher PD

Tracer-aided ecohydrological modelling across climate, land cover, and topographical gradients in the tropics

Funding Information: We thank the Leverhulme Trust funded ISOLAND (RPG‐2018‐375) project, the IAEA‐CRP F31005 contract 22904, the IAEA‐CRP F31006, and the IAEA‐CRP F31006 and UCR C1038 funded the IsoRSM project. We also acknowledge the many suggestions by two anonymous reviewers that improved this paper. Funding Information: We thank the Leverhulme Trust funded ISOLAND (RPG-2018-375) project, the IAEA-CRP F31005 contract 22904, the IAEA-CRP F31006, and the IAEA-CRP F31006 and UCR C1038 funded the IsoRSM project. We also acknowledge the many suggestions by two anonymous reviewers that improved this paper. Publisher Copyright: © 2023 The Authors. Hydrological Processes published by John Wiley & Sons Ltd.Peer reviewedPublisher PD

SEQUÍA EN CENTROAMÉRICA: IMPLEMENTACIÓN METODOLÓGICA ESPACIAL PARA LA CUANTIFICACIÓN DE SEQUÍAS EN EL GOLFO DE FONSECA

Estamos en la actualidad enfrentando un cambio climatológico causado por el calentamiento global, cuyos impactos sobre el ciclo hidrológico fortalecen los efectos ocasionados por el fenómeno de El Niño, que influye en la oscilación del clima centroamericano y causa condiciones extremas como sequías severas, aunque hay indicaciones de que la frecuencia de los eventos de precipitaciones inten- sas aumentaría, y se alargaría la duración de períodos secos por el calentamiento global. En el estudio se evalúan los modelos que permiten calificar y cuantificar los períodos de sequía en América Central