Dynamic diatom response to changing climate 0–1.2 Ma at Lake El'gygytgyn, Far East Russian Arctic

Snyder, J. A.; Cherepanova, M. V.; Bryan, Allison

doi:10.5194/cp-9-1309-2013

Cited by 19 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This interpretation is unlikely, as global paleoclimate records indicate MIS 11 to be one of the warmest interglacials of the last 800 ka (Past Interglacials Working Group of PAGES, 2016). High‐latitude paleoclimate records from the Northern Hemisphere (Minyuk et al., 2014; Snyder et al., 2013), including Greenland (de Vernal & Hillaire‐Marcel, 2008; Irvalı et al., 2020) and northern Siberia (Melles et al., 2012), suggest MIS 11 was a period of extreme warmth. Speleothem growth histories, including from the NWT, suggest that MIS 11 was marked by broader permafrost degradation than any subsequent interglacial (Biller‐Celander et al., 2021; Vaks et al., 2013).…”

Section: Discussionmentioning

confidence: 99%

Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records

Batchelor,

McGee,

Shakun

et al. 2024

Geophysical Research Letters

View full text Add to dashboard Cite

High‐resolution records from past interglacial climates help constrain future responses to global warming, yet are rare. Here, we produce seasonally resolved climate records from subarctic‐Canada using micron‐scale measurements of oxygen isotopes (δ18O) in speleothems with apparent annual growth bands from three interglacial periods—Marine Isotope Stages (MIS) 11, 9, and 5e. We find 3‰ lower δ18O values during MIS 11 than MIS 5e, despite MIS 11 likely being warmer. We explore controls on high‐latitude speleothem δ18O and suggest low MIS 11 δ18O values reflect greater contribution of cold‐season precipitation to dripwater from longer annual ground thaw durations. Other potential influences include changes in precipitation source and/or increased fraction of cold‐season precipitation from diminished sea ice in MIS 11. Our study highlights the potential for high‐latitude speleothems to yield detailed isotopic records of Northern Hemisphere interglacial climates beyond the reach of Greenland ice cores and offers a framework for interpreting them.

show abstract

Section: Discussionmentioning

confidence: 99%

Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records

Batchelor,

McGee,

Shakun

et al. 2024

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…300 mm higher even than during the Holocene thermal maximum (Melles et al, 2012). Warmer climate and an associated higher nutrient flux from the catchment into the lake during both MIS 31 and MIS 11.3 (Snyder et al, 2013;Vogel et al, 2013), in combination with a reduced ice coverage, promoted a maximum in-lake productivity as indicated by the peaks not only in Si / Ti but also in BSi as well as the diatom concentration and diversity (Snyder et al, 2013;Vogel et al, 2013). Higher nutrient flux was presumably supported by an enhanced soil formation due to a dense vegetation cover dominated by boreal evergreen conifer and cool-temperate broadleaf forests (Tarasov et al, 2013;Vogel et al, 2013).…”

Section: Pleistocene Climate Variabilitymentioning

confidence: 98%

“…Initial work on pilot cores from the lake, covering the past 250-350 ka, has proven its unique potential for regional paleoclimate and paleoenvironmental reconstructions (e.g., Brigham-Grette et al, 2007;Lozhkin et al, 2007a, b;Melles et al, 2007;Nowaczyk et al, 2007;Swann et al, 2010;Asikainen et al, 2007). Previous studies have focused on the inorganic geochemistry of the Lake El'gygytgyn sediments of the past 2-3 glacial-interglacial cycles.…”

mentioning

confidence: 99%

Pliocene to Pleistocene climate and environmental history of Lake El'gygytgyn, Far East Russian Arctic, based on high-resolution inorganic geochemistry data

et al. 2014

View full text Add to dashboard Cite

Abstract. The 3.6 Ma sediment record of Lake El'gygytgyn/NE Russia, Far East Russian Arctic, represents the longest continuous climate archive of the terrestrial Arctic. Its elemental composition as determined by X-ray fluorescence scanning exhibits significant changes since the mid-Pliocene caused by climate-driven variations in primary production, postdepositional diagenetic processes, and lake circulation as well as weathering processes in its catchment. During the mid- to late Pliocene, warmer and wetter climatic conditions are reflected by elevated Si / Ti ratios, indicating enhanced diatom production in the lake. Prior to 3.3 Ma, this signal is overprinted by intensified detrital input from the catchment, visible in maxima of clastic-related proxies, such as K. In addition, calcite formation in the early lake history points to enhanced Ca flux into the lake caused by intensified weathering in the catchment. A lack of calcite deposition after ca. 3.3 Ma is linked to the development of permafrost in the region triggered by cooling in the mid-Pliocene. After ca. 3.0 Ma the elemental data suggest a gradual transition to Pleistocene-style glacial–interglacial cyclicity. In the early Pleistocene, the cyclicity was first dominated by variations on the 41 kyr obliquity band but experienced a change to a 100 kyr eccentricity dominance during the middle Pleistocene transition (MPT) at ca. 1.2–0.6 Ma. This clearly demonstrates the sensitivity of the Lake El'gygytgyn record to orbital forcing. A successive decrease of the baseline levels of the redox-sensitive Mn / Fe ratio and magnetic susceptibility between 2.3 and 1.8 Ma reflects an overall change in the bottom-water oxygenation due to an intensified occurrence of pervasive glacial episodes in the early Pleistocene. The coincidence with major changes in the North Pacific and Bering Sea paleoceanography at ca. 1.8 Ma implies that the change in lake hydrology was caused by a regional cooling in the North Pacific and the western Beringian landmass and/or changes in the continentality. Further increases in total organic carbon and total nitrogen content after ca. 1.6 Ma are attributed to reduced organic matter decay in the sediment during prolonged anoxic periods. This points to more extensive periods of perennial ice coverage, and thus, to a progressive shifts towards more intense peak glacial periods. In the course of the Pleistocene glacial–interglacial sequence eight so-called "super-interglacials" occur. Their exceptionally warm conditions are reflected by extreme Si / Ti peaks accompanied by lows in Ti, K, and Fe, thus indicating extraordinary high lake productivity.

show abstract

Archaeal lipids reveal climate‐driven changes in microbial ecology at Lake El'gygytgyn (Far East Russia) during the Plio‐Pleistocene

Daniels

Castañeda

Salacup

et al. 2021

J Quaternary Science

View full text Add to dashboard Cite

Isoprenoid glycerol dialkyl glycerol tetraethers (iGDGTs) are commonly preserved molecular biomarkers of archaea whose distributions can be used to reconstruct past temperature, and possibly, methane and nitrogen cycling. To date, iGDGT systematics have not been widely investigated in Arctic lacustrine environments. Here, we analyze iGDGTs in sediments of Lake El'gygytgyn, located in the Russian Arctic, to reconstruct the paleoenvironmental conditions from the Pliocene to today using TEX86 and other indices. The TEX86‐inferred temperature history shows a long‐term warming trend, in stark contrast to other Arctic records and other proxies from Lake El'gygytgyn, suggesting that non‐temperature factors obfuscate the use of TEX86 at this site. Other GDGT‐based indices including the BIT Index, ΔRing Index, Methane Index and the GDGT‐0/crenarchaeol ratio suggest that TEX86 is strongly influenced by archaeal community changes. The most significant community shifts are observed c. 2.4 Ma and record an increase in Euryarchaeota production and/or a decrease in Thaumarchaeota production, which was driven by the establishment of permafrost and perennial lake ice during the early Pleistocene. Overall, this study demonstrates an important interpretative framework for iGDGTs in lacustrine systems and describes variations in Arctic climate and lake biogeochemistry over timescales of thousands to millions of years.

show abstract

Dynamic diatom response to changing climate 0–1.2 Ma at Lake El'gygytgyn, Far East Russian Arctic

Cited by 19 publications

References 41 publications

Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records

Insights Into Changing Interglacial Conditions in Subarctic Canada From MIS 11 Through MIS 5e From Seasonally Resolved Speleothem Records

Pliocene to Pleistocene climate and environmental history of Lake El'gygytgyn, Far East Russian Arctic, based on high-resolution inorganic geochemistry data

Archaeal lipids reveal climate‐driven changes in microbial ecology at Lake El'gygytgyn (Far East Russia) during the Plio‐Pleistocene

Contact Info

Product

Resources

About