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δ53Cr values of catchment runoff exhibit seasonality regardless of bedrock Cr concentrations: Role of periodically changing chromium export fluxes

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000243" target="_blank" >RIV/00025798:_____/21:00000243 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/00216208:11320/21:10435734

  • Výsledek na webu

    <a href="https://onlinelibrary.wiley.com/doi/10.1002/hyp.14434" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/hyp.14434</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1002/hyp.14434" target="_blank" >10.1002/hyp.14434</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    δ53Cr values of catchment runoff exhibit seasonality regardless of bedrock Cr concentrations: Role of periodically changing chromium export fluxes

  • Popis výsledku v původním jazyce

    One pre-requisite for the construction of a global chromium isotope mass balance is detailed understanding of Cr isotope systematics in the critical zone where redox-processes can modify the isotope signature of geogenic Cr input into the hydrosphere. A Cr isotope inventory of bedrock, soil and runoff was performed in a Central European headwater catchment underlain by amphibolite, situated in the vicinity of two previously studied catchments underlain by different bedrock types (serpentinite and leucogranite, respectively). Fresh bedrock in the amphibolite catchment NAZ contained ~300 mg kg-1 Cr, serpentinite at PLB contained ~800 mg kg-1 Cr, and leucogranite at LYS contained ~2 mg kg-1 Cr. Monthly hydrochemical monitoring at all three sites revealed higher Cr(VI) export fluxes in winter than in summer. NAZ was characterized by a distinct seasonality in the delta53Cr values, with minima during winter/spring snowmelts (-0.35 per mille) and maxima during dry summers (0.40per mille). Similar seasonality in delta53Cr values had been reported from PLB and LYS. Bedrock at all three sites had similar Cr isotope composition close to -0.10 per mille, a value indistinguishable from the delta53Cr value of bulk silicate Earth (BSE). Positive mean delta53Cr value of NAZ runoff indicated Cr-isotope fractionations during weathering of geogenic Cr(III), combined with adsorption of the resulting Cr(VI) on soil particles during pedogenesis. However, the massweighted mean delta53Cr of NAZ runoff was lower (-0.08 per mille), indistinguishable from the Cr isotope signature of bedrock. The same pattern of lower mass-weighted mean delta53Cr values ofrunoff, compared to arithmetic mean delta53Cr values of runoff, were observed also at PLB and LYS. We suggest that elevated Cr runoff fluxes in winter remove some of the residual isotopically light Cr that accumulated in the soil during summer. Seasonality in runoff delta53Cr values appears to be a relatively widespread phenomenon, de-coupled from Cr availability for chemical weathering

  • Název v anglickém jazyce

    δ53Cr values of catchment runoff exhibit seasonality regardless of bedrock Cr concentrations: Role of periodically changing chromium export fluxes

  • Popis výsledku anglicky

    One pre-requisite for the construction of a global chromium isotope mass balance is detailed understanding of Cr isotope systematics in the critical zone where redox-processes can modify the isotope signature of geogenic Cr input into the hydrosphere. A Cr isotope inventory of bedrock, soil and runoff was performed in a Central European headwater catchment underlain by amphibolite, situated in the vicinity of two previously studied catchments underlain by different bedrock types (serpentinite and leucogranite, respectively). Fresh bedrock in the amphibolite catchment NAZ contained ~300 mg kg-1 Cr, serpentinite at PLB contained ~800 mg kg-1 Cr, and leucogranite at LYS contained ~2 mg kg-1 Cr. Monthly hydrochemical monitoring at all three sites revealed higher Cr(VI) export fluxes in winter than in summer. NAZ was characterized by a distinct seasonality in the delta53Cr values, with minima during winter/spring snowmelts (-0.35 per mille) and maxima during dry summers (0.40per mille). Similar seasonality in delta53Cr values had been reported from PLB and LYS. Bedrock at all three sites had similar Cr isotope composition close to -0.10 per mille, a value indistinguishable from the delta53Cr value of bulk silicate Earth (BSE). Positive mean delta53Cr value of NAZ runoff indicated Cr-isotope fractionations during weathering of geogenic Cr(III), combined with adsorption of the resulting Cr(VI) on soil particles during pedogenesis. However, the massweighted mean delta53Cr of NAZ runoff was lower (-0.08 per mille), indistinguishable from the Cr isotope signature of bedrock. The same pattern of lower mass-weighted mean delta53Cr values ofrunoff, compared to arithmetic mean delta53Cr values of runoff, were observed also at PLB and LYS. We suggest that elevated Cr runoff fluxes in winter remove some of the residual isotopically light Cr that accumulated in the soil during summer. Seasonality in runoff delta53Cr values appears to be a relatively widespread phenomenon, de-coupled from Cr availability for chemical weathering

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10501 - Hydrology

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2021

  • Kód důvěrnosti údajů

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

Údaje specifické pro druh výsledku

  • Název periodika

    Hydrological Processes

  • ISSN

    0885-6087

  • e-ISSN

  • Svazek periodika

    35

  • Číslo periodika v rámci svazku

    12 : e14434

  • Stát vydavatele periodika

    GB - Spojené království Velké Británie a Severního Irska

  • Počet stran výsledku

    12

  • Strana od-do

    nestránkováno

  • Kód UT WoS článku

    000737864100020

  • EID výsledku v databázi Scopus

    2-s2.0-85121842652