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Climate 2018, 6(2), 22; https://doi.org/10.3390/cli6020022

A First Regional-Scale Estimate of Climate-Driven Terrestrial Carbon Export in Boreal Catchments

1
Met European Research Observatory, 82100 Benevento, Italy
2
Department of Science and Technology, University of Sannio, 82100 Benevento, Italy
3
UCA, INRA, VetAgro Sup, Unité Mixte de Recherche sur Écosystème Prairial (UREP), 63000 Clermont-Ferrand, France
*
Author to whom correspondence should be addressed.
Received: 19 February 2018 / Revised: 26 March 2018 / Accepted: 27 March 2018 / Published: 29 March 2018
(This article belongs to the Special Issue Decadal Variability and Predictability of Climate)
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Abstract

Highly dynamic hydro-geomorphic processes are known to drive exports of carbon (C) from river basins, but are not yet fully understood. Within this study, we simulated total organic carbon (TOC) exports at the outlet of Lake Simojärvi in the Gulf of Bothnia (Finland) with a parsimonious hydrological model. With thorough consideration of the dependence of erosion and sediment transport processes on seasonal precipitation rates, a satisfactory agreement was obtained between modelling and experimental observations (1962–2005). This provided confidence in the capability of the parsimonious model to represent temporal and spatial export dynamics. In the period 1860–2014, TOC export at the outlet of Lake Simojärvi was estimated to be highest on average (~5.5 Mg km−2·year−1) over 1974–2014 while the lowest TOC export (~2.5 Mg km−2·year−1) was estimated in 1860–1918 (with high levels of interannual-to-multidecadal variation). Regional simulations indicate that TOC increased in recent decades (on average, 4–5 Mg km−2·year−1 in 1974–2014 against ~3 Mg km−2·year−1 in 1940–1973) in northern Scandinavia and Finland. Warming-induced variability of TOC (which depends on precipitation patterns) may have altered the rates of C exchanges in aquatic ecosystems over recent years. TOC exports may continue to increase in boreal catchments with increasing temperatures as represented by future projections. View Full-Text
Keywords: hydro-climatic forcing; minimalist regression model; reconstructed series; total organic carbon hydro-climatic forcing; minimalist regression model; reconstructed series; total organic carbon
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Diodato, N.; Esposito, L.; Bellocchi, G. A First Regional-Scale Estimate of Climate-Driven Terrestrial Carbon Export in Boreal Catchments. Climate 2018, 6, 22.

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