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Sources and accumulation of sediment and particulate organic carbon in a subarctic fjard estuary: 210Pb, 137Cs, and δ13C records from Lake Melville, Labrador.
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- Author(s): Kamula, C. Michelle; Kuzyk, Zou Zou A.; Lobb, David A.; Macdonald, Robie W.
- Source:
Canadian Journal of Earth Sciences; 2017, Vol. 54 Issue 9, p993-1006, 14p- Subject Terms:
- Source:
- Additional Information
- Abstract: The sources and distribution of sediment and particulate organic carbon (OC) to Lake Melville, Labrador, were characterized to better understand impacts from climate and hydrological changes to the system. Mass accumulation rates (MARs) across the Lake Melville System (LMS) were established from 15 sediment cores collected in 2013 and 2014 by fitting excess 210Pb (210Pb
ex ) profiles to a two-layer advection-diffusion model. MARs, validated using 137Cs, varied between 0.04 and 0.41 g cm−2 a−1, and overall decreased with increasing distance from the Churchill River, which drains into Goose Bay, a western extension of Lake Melville. The Churchill River is the greatest source of sediment to the system, but surprisingly, MARs were greatest in western Lake Melville rather than Goose Bay, reflecting the contribution of fine material carried eastward in the Churchill River plume and inputs from nearby tributaries. A comparison of 137Cs and 210Pbex inventories to expected atmospheric fallout (1.5 and 23.6 disintegrations per minute (dpm) cm−2, respectively) in sediment across the LMS suggests particles are largely sourced from the watershed. In eastern Lake Melville, elevated 210Pbex inventories and marine OC point to particle scavenging of dissolved 210Pb from inflowing marine water. A transient tracer mixing model was used to determine the depth in each core where >90% of sediment was deposited before and after hydroelectric development at Churchill Falls (1970) and applied to down-core profiles of OC and organic carbon isotopes (δ13Corg ). We observed a significant increase of terrestrial OC to Lake Melville post 1970, which we interpret as change from climate or hydrology of the Churchill River. [ABSTRACT FROM AUTHOR] - Abstract: Les sources et la répartition des sédiments et du carbone organique (CO) particulaire du lac Melville, au Labrador, ont été caractérisées pour mieux comprendre les impacts des changements climatiques et hydrologiques sur ce système. Les taux d'accumulation massique (TAM) à l'échelle du système du lac Melville (SLM) ont d'abord été établis à la lumière de 15 carottes de sédiments prélevées en 2013 et 2014, en calant les profils de 210Pb excédentaire (210Pb
ex ) sur un modèle de advection-diffusion à deux couches. Les TAM, validés en utilisant le 137Cs, vont de 0,04 à 0,41 g cm−2 a−1, mais diminuent en s'éloignant de la rivière Churchill, qui se déverse dans la baie Goose, un prolongement vers l'ouest du lac Melville et la plus importante source de sédiments entrant dans le système. Étonnement, les TAM sont les plus élevés dans la partie occidentale du lac Melville, reflétant les apports de matériaux fins transportés vers l'est dans le panache de la rivière Churchill et de plus petits affluents situés à proximité. Une comparaison des inventaires de 137Cs et de 210Pbex aux retombées atmosphériques attendues (1,5 et 23,6 désintégrations par minute (dpm) cm−2, respectivement) dans les sédiments à l'échelle du SLM porte à croire que les particules proviennent en majeure partie du bassin versant. Dans la partie est du lac Melville, les inventaires de 210Pbex et le CO marin élevés indiqueraient un piégeage par les particules du 210Pb dissous provenant d'eau de mer entrant dans le lac. Un modèle de mélange d'indicateurs transitoires a été utilisé pour déterminer la profondeur dans chaque carotte correspondant à une proportion de > 90 % de sédiments déposés avant ou après l'aménagement hydroélectrique à Churchill Falls (1970). Ce modèle a été utilisé pour examiner les variations du CO et des isotopes de carbone organique (δ13Corg ) dans les profils des carottes. Nous avons observé une augmentation significative de l'apport de CO terrestre dans le lac Melville après 1970 que nous interprétons comme reflétant un changement découlant du climat ou de l'hydrologie de la rivière Churchill. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Canadian Journal of Earth Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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