Time-series of δ26Mg values in a headwater catchment reveal decreasing magnesium isotope variability from precipitation to runoff

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000145" target="_blank" >RIV/00025798:_____/21:00000145 - isvavai.cz</a>

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/hyp.14116" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/hyp.14116</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/hyp.14116" target="_blank" >10.1002/hyp.14116</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Time-series of δ26Mg values in a headwater catchment reveal decreasing magnesium isotope variability from precipitation to runoff

Popis výsledku v původním jazyce

Data on temporal variability in Mg isotope ratios of atmospheric deposition and runoff are critical for decreasing the uncertainty associated with construction of isotope mass balances in headwater catchments, and statistical evaluation of isotope differences among Mg pools and fluxes. Such evaluations, in turn, are needed to distinguish between biotic and abiotic contributions to Mg2+ in catchment runoff. We report the first annual time-series of delta26Mg values simultaneously determined for rainfall, canopy throughfall, soil water and runoff. The studied 55-ha catchment, situated in western Czech Republic, is underlain by Mg-rich amphibolite and covered by mature spruce stands. Between 1970 and 1996, the site received extremely high amounts of acid deposition and fly ash form nearby coal-burning power plants. The delta26Mg values of open-area precipitation (median of -0.79per mille) at our study site were statistically indistinguishable from the delta26Mg values of throughfall (-0.73per mille), but significantly different from the delta26Mg values of soil water (-0.55per mille) and runoff (-0.55per mille). The range of delta26Mg values during the observation period decreased in the order: open-area precipitation (0.57per mille) >; throughfall (0.27per mille) >; runoff (0.21per mille) >; soil water (0.16per mille). The decreasing variability in delta26Mg values of Mg2+ from precipitation to soil water and runoff reflected an increasing homogenization of atmospheric Mg in the catchment and its mixing with geogenic Mg. In addition to atmospheric Mg, runoff also contained Mg mobilized from the three major solid Mg pools, bedrock (delta26Mg of -0.32per mille), soil (-0.28per mille), and vegetation (-0.31per mille). The drought of summer 2019 did not affect the nearly constant delta26Mg value of runoff. Collectively, our data show that withincatchment processes buffer the Mg isotope variability of the atmospheric input.

Název v anglickém jazyce

Time-series of δ26Mg values in a headwater catchment reveal decreasing magnesium isotope variability from precipitation to runoff

Popis výsledku anglicky

Data on temporal variability in Mg isotope ratios of atmospheric deposition and runoff are critical for decreasing the uncertainty associated with construction of isotope mass balances in headwater catchments, and statistical evaluation of isotope differences among Mg pools and fluxes. Such evaluations, in turn, are needed to distinguish between biotic and abiotic contributions to Mg2+ in catchment runoff. We report the first annual time-series of delta26Mg values simultaneously determined for rainfall, canopy throughfall, soil water and runoff. The studied 55-ha catchment, situated in western Czech Republic, is underlain by Mg-rich amphibolite and covered by mature spruce stands. Between 1970 and 1996, the site received extremely high amounts of acid deposition and fly ash form nearby coal-burning power plants. The delta26Mg values of open-area precipitation (median of -0.79per mille) at our study site were statistically indistinguishable from the delta26Mg values of throughfall (-0.73per mille), but significantly different from the delta26Mg values of soil water (-0.55per mille) and runoff (-0.55per mille). The range of delta26Mg values during the observation period decreased in the order: open-area precipitation (0.57per mille) >; throughfall (0.27per mille) >; runoff (0.21per mille) >; soil water (0.16per mille). The decreasing variability in delta26Mg values of Mg2+ from precipitation to soil water and runoff reflected an increasing homogenization of atmospheric Mg in the catchment and its mixing with geogenic Mg. In addition to atmospheric Mg, runoff also contained Mg mobilized from the three major solid Mg pools, bedrock (delta26Mg of -0.32per mille), soil (-0.28per mille), and vegetation (-0.31per mille). The drought of summer 2019 did not affect the nearly constant delta26Mg value of runoff. Collectively, our data show that withincatchment processes buffer the Mg isotope variability of the atmospheric input.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Hydrological Processes

ISSN

0885-6087

e-ISSN

—

Svazek periodika

35

Číslo periodika v rámci svazku

4 : e14116

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

nestránkováno

Kód UT WoS článku

000645220700012

EID výsledku v databázi Scopus

2-s2.0-85104999779