Sedimentary geochemistry of core PG1351 from Lake El’gygytgyn—a sensitive record of climate variability in the East Siberian Arctic during the past three glacial–interglacial cycles

Melles, Martin; Brigham‐Grette, Julie; Glushkova, O. Yu.; Minyuk, P. S.; Nowaczyk, Norbert R; Hubberten, Hans-W.

doi:10.1007/s10933-006-9025-6

Cited by 140 publications

(242 citation statements)

References 40 publications

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“…In concordance with this interpretation of the clusters the scheme of climate modes, as defined by Melles et al (2007), was then refined and extended to 350 ka in core Lz1024 (Fig. 6).…”

Section: Resultsmentioning

confidence: 91%

“…Thus, the interpretation of the sediment variability of core PG1351 in terms of changes between oxic and anoxic conditions in the bottom waters can directly be transferred to core Lz1024, including the pattern of climate modes as defined by Melles et al (2007). Downcore plots of the results of the cluster analysis for both cores in combination with this pattern are shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

“…Thus the gradual changes in the sedimentary composition as an indicator of available oxygen in the hypolimnion during glacial/non-glacial periods and the lack of mixing in the water column can be resolved in greater detail by using statistical approaches. But not every climate phase is detectable by means of cluster analysis alone, as was demonstrated by the samples between 120.1 and 127 ka (MIS 5.5) that were not assigned to a peak warm mode as defined by Melles et al (2007). The increased values in only one of the parameters used, the TOC, are not sufficient to single out this period.…”

Section: Discussionmentioning

confidence: 95%

“…This allowed for extending and refining the existing pattern of climate variability from 250 ka back to 350 ka. By means of cluster analysis it was possible to clearly differentiate between three of the four climate modes as defined by Melles et al (2007). In addition to the warm, cold and dry, and cold and moist modes, two transitional modes were identified, representing the early stages of cold phases and slightly colder conditions during warm phases, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…The sediment consists of alternations of brownish and greenish nonlaminated and laminated greyish silt and clay; including some turbidites with thicknesses of up to 45 cm (Juschus et al, 2009). Former investigations on core PG1351 (Nowaczyk et al, 2002Melles et al, 2007;Minyuk et al, 2007) revealed that anoxic and laminated conditions primarily occur during periods of perennial ice cover and oxic and nonlaminated conditions occur when open water controls mixing of the water body during summer times . In intervals with prevailing anoxic conditions reductive dissolution of magnetite was observed whereas organic matter is well preserved.…”

Section: Settings and Materialsmentioning

confidence: 99%

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A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis

et al. 2013

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Rock magnetic, biochemical and inorganic records of the sediment cores PG1351 and Lz1024 from Lake El'gygytgyn, Chukotka peninsula, Far East Russian Arctic, were subject to a hierarchical agglomerative cluster analysis in order to refine and extend the pattern of climate modes as defined by Melles et al. (2007). Cluster analysis of the data obtained from both cores yielded similar results, differentiating clearly between the four climate modes warm, peak warm, cold and dry, and cold and moist. In addition, two transitional phases were identified, representing the early stages of a cold phase and slightly colder conditions during a warm phase. The statistical approach can thus be used to resolve gradual changes in the sedimentary units as an indicator of available oxygen in the hypolimnion in greater detail. Based upon cluster analyses on core Lz1024, the published succession of climate modes in core PG1351, covering the last 250 ka, was modified and extended back to 350 ka. Comparison to the marine oxygen isotope (δ¹⁸O) stack LR04 (Lisiecki and Raymo, 2005) and the summer insolation at 67.5° N, with the extended Lake El'gygytgyn parameter records of magnetic susceptibility (κ_LF), total organic carbon content (TOC) and the chemical index of alteration (CIA; Minyuk et al., 2007), revealed that all stages back to marine isotope stage (MIS) 10 and most of the substages are clearly reflected in the pattern derived from the cluster analysis

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“…In concordance with this interpretation of the clusters the scheme of climate modes, as defined by Melles et al (2007), was then refined and extended to 350 ka in core Lz1024 (Fig. 6).…”

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Settings and Materialsmentioning

confidence: 99%

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A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis

et al. 2013

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Trends of ice breakup date in south‐central Ontario

Yao

2015

JGR Atmospheres

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Large‐scale ice phenology studies have revealed overall patterns of later freeze, earlier breakup, and shorter duration of ice in the Northern Hemisphere. However, there have been few studies regarding the trends, including their spatial patterns, in ice phenology for individual waterbodies on a local or small regional scale, although the coherence of ice phenology has been shown to decline rapidly in the first few hundred kilometers. In this study, we extracted trends, analyzed affecting factors, and investigated relevant spatial patterns for ice breakup date time series at 10 locations with record length ≥90 years in south‐central Ontario, Canada. Wavelet methods, including the multiresolution analysis (MRA) method for nonlinear trend extraction and the wavelet coherence (WTC) method for identifying the teleconnections between large‐scale climate modes and ice breakup date, are proved to be effective in ice phenology analysis. Using MRA method, the overall trend of ice breakup date time series (1905–1991) varied from earlier ice breakup to later ice breakup, then to earlier breakup again from south to north in south‐central Ontario. Ice breakup date is closely correlated with air temperature during certain winter/spring months, as well as the last day with snow on the ground and number of snow‐on‐ground days. The influences of solar activity and Pacific North American on ice breakup were comparatively uniform across south‐central Ontario, while those of El Niño–Southern Oscillation, North Atlantic Oscillation, and Arctic Oscillation on ice phenology changed with distance of 50–100 km in the north‐south direction.

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Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime

et al. 2016

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Numerous international scientific assessments and related articles have, during the last decade, described the observed and potential impacts of climate change as well as other related environmental stressors on Arctic ecosystems. There is increasing recognition that observed and projected changes in freshwater sources, fluxes, and storage will have profound implications for the physical, biogeochemical, biological, and ecological processes and properties of Arctic terrestrial and freshwater ecosystems. However, a significant level of uncertainty remains in relation to forecasting the impacts of an intensified hydrological regime and related cryospheric change on ecosystem structure and function. As the terrestrial and freshwater ecology component of the Arctic Freshwater Synthesis, we review these uncertainties and recommend enhanced coordinated circumpolar research and monitoring efforts to improve quantification and prediction of how an altered hydrological regime influences local, regional, and circumpolar-level responses in terrestrial and freshwater systems. Specifically, we evaluate (i) changes in ecosystem productivity; (ii) alterations in ecosystem-level biogeochemical cycling and chemical transport; (iii) altered landscapes, successional trajectories, and creation of new habitats; (iv) altered seasonality and phenological mismatches; and (v) gains or losses of species and associated trophic interactions. We emphasize the need for developing a process-based understanding of interecosystem interactions, along with improved predictive models. We recommend enhanced use of the catchment scale as an integrated unit of study, thereby more explicitly considering the physical, chemical, and ecological processes and fluxes across a full freshwater continuum in a geographic region and spatial range of hydroecological units (e.g., stream-pond-lake-river-near shore marine environments).

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Sedimentary geochemistry of core PG1351 from Lake El’gygytgyn—a sensitive record of climate variability in the East Siberian Arctic during the past three glacial–interglacial cycles

Cited by 140 publications

References 40 publications

A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis

A 350 ka record of climate change from Lake El'gygytgyn, Far East Russian Arctic: refining the pattern of climate modes by means of cluster analysis

Trends of ice breakup date in south‐central Ontario

Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime

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