@article{efb7db6be41043fdaa41da3b93d47946,
title = "Antecedent Hydrologic Conditions Reflected in Stream Lithium Isotope Ratios During Storms",
abstract = "Antecedent hydrological conditions are recorded through the evolution of dissolved lithium isotope signatures ((Formula presented.) Li) by juxtaposing two storm events in an upland watershed subject to a Mediterranean climate. Discharge and (Formula presented.) Li are negatively correlated in both events, but mean (Formula presented.) Li ratios and associated ranges of variation are distinct between them. We apply a previously developed reactive transport model (RTM) for the site to these event-scale flow perturbations, but observed shifts in stream (Formula presented.) Li are not reproduced. To reconcile the stability of the subsurface solute weathering profile with our observations of dynamic stream (Formula presented.) Li signatures, we couple the RTM to a distribution of fluid transit times that evolve based on storm hydrographs. The approach guides appropriate flux-weighting of fluid from the RTM over a range of flow path lengths, or equivalently fluid residence times. This flux-weighted RTM approach accurately reproduces dynamic storm (Formula presented.) Li-discharge patterns distinguished by the antecedent conditions of the watershed.",
keywords = "critical zone, geochemistry, hydrology, lithium isotopes, solute export, storms",
author = "Golla, {Jon K.} and Julien Bouchez and Druhan, {Jennifer L.}",
note = "We are especially grateful to Marie Kuessner, Pierre\u2010Alain Ayral, Jean\u2010Fran\u00E7ois Didon\u2010Lescot, Jean\u2010Marc Domergue, Nadine Grard, Didier Josselin, Philippe Martin (UMR ESPACE), and Yannick Manche (PNC), for support during field work and insightful discussions. The \u201CParc National des C\u00E9vennes\u201D (PNC) is acknowledged for allowing us to conduct scientific work within the park. We thank Pierre Maffre, and a second anonymous reviewer for their constructive feedback, as well as GRL editor Hari Rajaram for his handling of the paper. Funding support is provided by NSF\u2010EAR\u20102047318 awarded to J.L.D. Sample analysis was supported by the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007\u20132013/under REA agreement [608069] (ITN \u201CIsoNose\u201D), the IPGP multidisciplinary program PARI (with analytical help from Pascale Louvat, Julien Moureau, Jessica Dallas, Thibaud Sondag, Caroline Gorge, Pierre Burckel, and La\u00EBticia Faure), and the Region le\u2010de\u2010France SESAME Grant 12015908. J.K.G. acknowledges support from the NSF Graduate Research Fellowship Program. Part of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE\u2010AC52\u201007NA27344 (LLNL\u2010JRNL\u2010866541). We are especially grateful to Marie Kuessner, Pierre-Alain Ayral, Jean-Fran\u00E7ois Didon-Lescot, Jean-Marc Domergue, Nadine Grard, Didier Josselin, Philippe Martin (UMR ESPACE), and Yannick Manche (PNC), for support during field work and insightful discussions. The \u201CParc National des C\u00E9vennes\u201D (PNC) is acknowledged for allowing us to conduct scientific work within the park. We thank Pierre Maffre, and a second anonymous reviewer for their constructive feedback, as well as GRL editor Hari Rajaram for his handling of the paper. Funding support is provided by NSF-EAR-2047318 awarded to J.L.D. Sample analysis was supported by the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7/2007\u20132013/under REA agreement [608069] (ITN \u201CIsoNose\u201D), the IPGP multidisciplinary program PARI (with analytical help from Pascale Louvat, Julien Moureau, Jessica Dallas, Thibaud Sondag, Caroline Gorge, Pierre Burckel, and La\u00EBticia Faure), and the Region I\u02C6 $\\widehat{I}$le-de-France SESAME Grant 12015908. J.K.G. acknowledges support from the NSF Graduate Research Fellowship Program. Part of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344 (LLNL-JRNL-866541).",
year = "2024",
month = sep,
day = "16",
doi = "10.1029/2024GL109624",
language = "English (US)",
volume = "51",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "John Wiley & Sons, Ltd.",
number = "17",
}