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