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Artículo

Isotopic Equilibrium Between Precipitation and Water Vapor in Northern Patagonia and Its Consequences on δ18Ocellulose Estimate

Penchenat, Tiphaine; Vimeux, Françoise; Daux, Valérie; Cattani, Olivier; Viale, MaximilianoIcon ; Villalba, RicardoIcon ; Srur, Ana MarinaIcon ; Outrequin, Clément
Fecha de publicación: 02/2020
Editorial: Blackwell Publishing
Revista: Journal of Geophysical Research: Biogeosciences
ISSN: 2169-8953
e-ISSN: 2169-8961
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Investigación Climatológica

Resumen

Modeling work of the isotopic composition of tree ring cellulose (δ18Ocell) relies on the isotopic equilibrium assumption between atmospheric water vapor and tree source water, frequently assimilated to integrated precipitation. Here, we explore the veracity of this assumption based on observations collected during a field campaign in Río Negro province (Argentina) in February–March 2017. We examine how the observed isotopic composition of water vapor deviates from equilibrium with precipitation. This deviation, named isotopic disequilibrium (Δ18Ovap_eq), is low (between −2.0‰ and 4.1‰) and a significant relationship is observed between the isotopic composition of water vapor and its expected value at equilibrium. Negative Δ18Ovap_eq can be explained by evaporation of small raindrops (from 1% to 5% of initial droplet mass). Positive Δ18Ovap_eq can result from vegetation transpiration with transpired water accounting for 14% to 29% to ambient water vapor. The low Δ18Ovap_eq at the study site may be due to the high level of relative humidity (from 70% to 96%) favoring isotopic diffusive exchanges between the two water phases and thus promoting the isotopic equilibrium. We examine the impact of the isotopic equilibrium assumption on the calculation of δ18Ocell. A perfect agreement is shown between observed and calculated δ18Ocell provided that the isotopic composition of source water is significantly higher than the expected averaged isotopic composition of precipitation over the tree growing period.
Palabras clave: CELLULOSE , ISOTOPIC EQUILIBRIUM , PATAGONIA , PRECIPITATION , WATER VAPOR
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/141429
URL: https://onlinelibrary.wiley.com/doi/abs/10.1029/2019JG005418
DOI: http://dx.doi.org/10.1029/2019JG005418
Colecciones
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Citación
Penchenat, Tiphaine; Vimeux, Françoise; Daux, Valérie; Cattani, Olivier; Viale, Maximiliano; et al.; Isotopic Equilibrium Between Precipitation and Water Vapor in Northern Patagonia and Its Consequences on δ18Ocellulose Estimate; Blackwell Publishing; Journal of Geophysical Research: Biogeosciences; 125; 3; 2-2020; 1-18
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