A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

Moy, Christopher M.; Dunbar, Robert B.; Guilderson, Thomas P.; Waldmann, Nicolás; Mucciarone, David A.; Recasens, Cristina; Ariztegui, Daniel; Austin, James A.; Anselmetti, Flavio S.

doi:10.1016/j.epsl.2010.11.011

Cited by 33 publications

(56 citation statements)

References 68 publications

(22 reference statements)

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“…Temporal shifts in d 13 C and d 15 N values of the lake sediments reflect changes in the source of OM, likely induced by changes in climate and lake environment (e.g. Macko et al, 1984;Meyers, 1997;Lamb et al, 2006;Moy et al, 2011). The data including d 13 C, d 15 N and C/N of the lake sediment have been detrended to remove any long-term trend by subtracting the next value from the current value (using first-order difference method) (Figs.…”

Section: Carbon and Nitrogen Isotopic Characteristics Of Lake Sedimentmentioning

confidence: 99%

Reconstruction of paleostorms and paleoenvironment using geochemical proxies archived in the sediments of two coastal lakes in northwest Florida

Das

Wang

Donoghue

et al. 2013

Quaternary Science Reviews

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Section: Carbon and Nitrogen Isotopic Characteristics Of Lake Sedimentmentioning

confidence: 99%

Reconstruction of paleostorms and paleoenvironment using geochemical proxies archived in the sediments of two coastal lakes in northwest Florida

Das

Wang

Donoghue

et al. 2013

Quaternary Science Reviews

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“…1B). These cores were retrieved in the vicinity of previously studied seismic profiles and core sequences (Waldmann et al, 2010a;Moy et al, 2011). Core LF06-PC5 is 2.12 m long and presents grey and black sediment laminae in the upper 1.42 m, which represents the studied sequence in this contribution.…”

Section: Sediment Coresmentioning

confidence: 99%

“…Previous attempts to establish age models for sediment cores from Lago Fagnano (LF06-PC12, -PC16 and -PC18; Fig. 1B) were based on the H1 tephra age (Stern, 2008; recently refined in Stern et al, 2016) and Accelerator Mass Spectrometry (AMS) radiocarbon dating of bulk organic sediments, terrestrial macrofossils and pollen concentrates (Moy et al, 2011;Waldmann et al, 2011). The latter were found to produce the most reliable results for sediments from Lago Fagnano, whereas ages obtained from bulk sediments were 5000 to 7000 years older, most likely due to contamination with radiocarbon-dead material.…”

Section: Radiocarbon Datingmentioning

confidence: 99%

“…Lago Fagnano is the southernmost large ice-free lake outside Antarctica and, as such, a gateway for understanding past and present relations between Antarctic, South Pacific and South Atlantic climate changes. The sediments deposited in this lake during the Holocene underwent various sedimentological, geochemical and micropalaeontological analyses to reconstruct palaeoclimatic and environmental changes, glacier fluctuations and tectonic activity in this region (Waldmann et al, 2008;2010a;2010b;Moy et al, 2011). These studies demonstrate that the sediments deposited in Lago Fagnano are a sensitive and reliable recorder of past climate variability in the southern high latitudes.…”

Section: Introductionmentioning

confidence: 95%

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Cyclic preservation of Fe/Mn-redox fronts in sediments of an oligotrophic, ventilated deep-water lake (Lago Fagnano, Tierra del Fuego)

Neugebauer¹,

Thomas²,

Waldmann³

et al. 2018

Preprint

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Changing redox conditions in lakes are captured in their sediments, and are often influenced by climate. Their study therefore allows tracing past climate change on (sub-) annual to longer time-scales. In Lago Fagnano (54°S Argentina/Chile), an oligotrophic and deep-ventilated soft-water lake, cyclic alternations of light grey clay and dark green to black laminae are preserved throughout the Holocene sedimentary record. This study aims at clarifying the mechanism, frequency, and climatic forcing of laminae formation and preservation in Lago Fagnano, and their relation to changing redox conditions in the lake. Using high-resolution XRF scanning and mapping, thin section, XRD and SEM analyses of sediment cores, Fe- and Mn-oxides were identified as generating the lamination on (sub-) decadal time-scales. Black and greenish laminae are interpreted as buried palaeo-oxidation fronts that underwent early diagenetic processes. The burial of redox fronts in Lago Fagnano is most likely promoted by cyclic rapid increases of sedimentation due to higher runoff and mass-wasting events. Increased runoff is related to the strength of the Southern Hemisphere Westerlies that, in turn, is modified by climate oscillations. Therefore, it is suggested that the cyclic repetition of the buried palaeo-redox fronts, showing periodicities of ~52 and ~4.5 years in the western and eastern sub-basins of Lago Fagnano, respectively, is forced by climate modes. The most likely candidates are the Antarctic Oscillation (AO) and the El Niño Southern Oscillation (ENSO), both impacting southernmost South America and showing similar sub-decadal modes and multi-decadal variations. Although the burial of redox fronts in lake or marine sediments is well-known, this study is the first to present a record of cyclic, high-frequency recurrence of these fronts most likely triggered by changing climate.

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“…However, TOC is sensitive to changes in sediment accumulation rates, and so arguably a better estimate of organic carbon burial is achieved through the calculation of carbon burial (or mass accumulation) rates (CMAR; g C m −2 yr −1 ; Meyers & Teranes, ) which are closely associated with the delivery of allochthonous carbon to lakes (e.g. Watanabe et al ., ; Hyodo & Longstaffe, ; Moy et al ., ). Sources of organic carbon sequestered into lake sediments may be further discriminated through their carbon isotope composition ( δ 13 C TOC ) and TOC/total nitrogen (C/N) ratios (Leng & Marshall, ).…”

Section: Introductionmentioning

confidence: 99%

Holocene carbon dynamics at the forest–steppe ecotone of southern Siberia

Mackay¹,

Seddon

Leng

et al. 2016

Global Change Biology

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The forest-steppe ecotone in southern Siberia is highly sensitive to climate change; global warming is expected to push the ecotone northwards, at the same time resulting in degradation of the underlying permafrost. To gain a deeper understanding of long-term forest-steppe carbon dynamics, we use a highly resolved, multiproxy, palaeolimnological approach, based on sediment records from Lake Baikal. We reconstruct proxies that are relevant to understanding carbon dynamics including carbon mass accumulation rates (CMAR; g C m À2 yr À1) and isotope composition of organic matter (d 13 C TOC ). Forest-steppe dynamics were reconstructed using pollen, and diatom records provided measures of primary production from near-and off-shore communities. We used a generalized additive model (GAM) to identify significant change points in temporal series, and by applying generalized linear leastsquares regression modelling to components of the multiproxy data, we address (1) What factors influence carbon dynamics during early Holocene warming and late Holocene cooling? (2) How did carbon dynamics respond to abrupt sub-Milankovitch scale events? and (3) What is the Holocene carbon storage budget for Lake Baikal. CMAR values range between 2.8 and 12.5 g C m À2 yr À1 . Peak burial rates (and greatest variability) occurred during the early Holocene, associated with melting permafrost and retreating glaciers, while lowest burial rates occurred during the neoglacial. Significant shifts in carbon dynamics at 10.3, 4.1 and 2.8 kyr BP provide compelling evidence for the sensitivity of the region to sub-Milankovitch drivers of climate change. We estimate that 1.03 Pg C was buried in Lake Baikal sediments during the Holocene, almost one-quarter of which was buried during the early Holocene alone. Combined, our results highlight the importance of understanding the close linkages between carbon cycling and hydrological processes, not just temperatures, in southern Siberian environments.

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A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego

Cited by 33 publications

References 68 publications

Reconstruction of paleostorms and paleoenvironment using geochemical proxies archived in the sediments of two coastal lakes in northwest Florida

Reconstruction of paleostorms and paleoenvironment using geochemical proxies archived in the sediments of two coastal lakes in northwest Florida

Cyclic preservation of Fe/Mn-redox fronts in sediments of an oligotrophic, ventilated deep-water lake (Lago Fagnano, Tierra del Fuego)

Holocene carbon dynamics at the forest–steppe ecotone of southern Siberia

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