Are geochemical regime shifts identifiable in river waters? Exploring the compositional dynamics of the Tiber River (Italy)

Autor: Gozzi C.[1], Dakos V.[2], Buccianti A.[1], Vaselli O.[1
Přispěvatelé: Dipartimento di Scienze della Terra [Firenze] (DST), Università degli Studi di Firenze = University of Florence (UniFI), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), CNR Istituto di Geoscienze e Georisorse [Firenze] (IGG), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Consiglio Nazionale delle Ricerche (CNR)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Science of the total environment 785 (2021): 1–14. doi:10.1016/j.scitotenv.2021.147268
info:cnr-pdr/source/autori:Gozzi C.[1], Dakos V.[2], Buccianti A.[1], Vaselli O.[1,3]/titolo:Are geochemical regime shifts identifiable in river waters? Exploring the compositional dynamics of the Tiber River (Italy)/doi:10.1016%2Fj.scitotenv.2021.147268/rivista:Science of the total environment/anno:2021/pagina_da:1/pagina_a:14/intervallo_pagine:1–14/volume:785
Science of the Total Environment
Science of the Total Environment, 2021, 785, pp.147268. ⟨10.1016/j.scitotenv.2021.147268⟩
Science of the Total Environment, Elsevier, 2021, 785, pp.147268. ⟨10.1016/j.scitotenv.2021.147268⟩
ISSN: 0048-9697
1879-1026
Popis: Rivers are dynamic and sensitive systems that change their chemical composition from source to mouth. This is due to the influence of a set of variables controlled by hydro-litho-eco-atmospheric processes and anthropic pressures which are, in turn, affected by catchment attributes. This work proposes a new way of thinking about river geochemistry focused on environmental interconnections rather than single chemical variables. Abrupt changes in the system state (composition) of a certain environmental media, driven by perturbations, may trigger Geochemical Regime Shifts (GRSs). This eventuality is explored in the Tiber River (central Italy) chemistry by Compositional Data Analysis, robust Principal Component Analysis and score-distance graphs. Data variability and the interlinks between response and forcing variables are investigated for different drained areas. A potential GRS is detected for major elements in the lower reaches resulting from a threshold-like state response caused by lithological forcing. On the contrary, trace elements respond gradually to environmental drivers, showing no abrupt changes. The findings outline mechanisms and factors influencing the river's self-restoring capability at a basin-wide scale, providing a better comprehension of the circumstances controlling the equilibrium dynamics of river water systems.
Databáze: OpenAIRE
Externí odkaz: