Redox evolution during Eemian and Holocene sapropel formation in the Black Sea

Wegwerth, Antje; Eckert, Sebastian; Dellwig, Olaf; Schnetger, Bernhard; Severmann, Silke; Weyer, Stefan; Brüske, Annika; Kaiser, Jérôme; Köster, Jürgen; Arz, Helge Wolfgang; Brumsack, Hans‐Jürgen

doi:10.1016/j.palaeo.2017.10.014

Cited by 43 publications

(25 citation statements)

References 80 publications

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“…Unusually high amounts of Mn carbonate are also found e.g., in manganiferous black shales deposited in the geological past (Calvert and Pedersen, 1993;Huckriede and Meischner, 1996). While missing in euxinic typelocalities like the Black Sea, where euxinic bottom waters prevail since ∼7,000 years (Calvert and Pedersen, 1996;Wegwerth et al, 2018), the deep basins of the Baltic Sea are the only modern settings showing comparable and even higher Mn carbonate abundances (Suess, 1979;Lenz et al, 2015;Häusler et al, 2018). Despite their manifold occurrence, the detailed pathways of Mn carbonate formation remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Major Baltic Inflow in 2014 on Manganese Cycling in the Gotland Deep (Baltic Sea)

et al. 2018

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Section: Introductionmentioning

confidence: 99%

Impact of the Major Baltic Inflow in 2014 on Manganese Cycling in the Gotland Deep (Baltic Sea)

et al. 2018

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“…Furthermore, the permanent presence of benthic ostracods, low contents of total organic carbon, and lack of enrichment of redox-sensitive trace metals during MIS 3 and MIS 6 strongly suggest that the Black Sea water column was not affected by oxygen deficiency or methanogenic activity, which could have impacted habitat depths and/or phylogeny of the archaeal community and potentially biased TEX 86 values (Hurley et al, 2016;Kusch et al, 2016;Qin et al, 2015;Wegwerth et al, 2014Wegwerth et al, , 2016Wegwerth et al, , 2018Wegwerth et al, , 2019. This is further evidenced by a GDGT-0/crenarchaeol mean ratio <2 (0.6 ± 0.1; Figure 3c), which is typical for Thaumarchaeota and further suggests that methanogens are negligible as additional source of isoprenoid GDGTs (Blaga et al, 2009;Schouten et al, 2002Schouten et al, , 2013Turich et al, 2007).…”

Section: Reliability Of the Tex 86 Temperature Proxy In The Glacial Bmentioning

confidence: 99%

Impact of Eurasian Ice Sheet and North Atlantic Climate Dynamics on Black Sea Temperature Variability During the Penultimate Glacial (MIS 6, 130–184 ka BP)

Wegwerth

Kaiser

Dellwig

et al. 2020

Paleoceanog and Paleoclimatol

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Understanding hemisphere‐wide millennial‐scale temperature variability during past glacials in response to ice sheet dynamics and orbital forcing is one of the key targets for Quaternary climate research. While an inland propagation of abrupt temperature changes into Eurasia from the North Atlantic realm during the last glacial (Weichselian) receives increasingly broad support, much less is known regarding the penultimate glacial (Saalian) temperature variability, especially from a continental interior perspective. Here, we present a TEX86‐derived lake surface temperature (LST) record from the former Black Sea “Lake” covering nearly the entire Marine Isotope Stage (MIS) 6. While orbital‐scale LST cooling likely relates to meltwater discharge from the retreating Eurasian Ice Sheet during insolation maxima, millennial‐scale LST variability suggests interstadial warming in phase with Greenland and northern Mediterranean Sea temperature records during the first half of MIS 6. Although summer insolation reached an interglacial‐like level during this period, we propose that the reduced extent of the Eurasian Ice Sheet associated with northward shifted atmospheric fronts was ultimately responsible for the inland propagation of Dansgaard‐Oeschger‐like temperature variability. During the second half of MIS 6, temperature patterns across the North Atlantic‐Eurasian corridor were more variable and less comparable with each other, likely because of the larger continental ice sheet weakening northern hemisphere atmospheric teleconnections. Temperature records across the North Atlantic‐Eurasian realm suggest a weaker atmospheric teleconnection during MIS 6 compared to MIS 3, likely related to a stronger imprint of the Eurasian Ice Sheet on the continental and regional climate.

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“…However, the enrichment factors for the Mediterranean sapropels and Units 1 and 2 from the Black Sea exhibit different patterns (Fig. 10) owing to the pronounced depletion of trace elements in the water column of the Black Sea during Unit 1 and less pronounced euxinia during most parts of Unit 2 (Wegwerth et al, 2018). The studied HVMIs are most similar to Black Sea Unit 2 in that redox-sensitive (As, Cu, Mo, Re, U, V, and Zn) and productivity (Cd) elements are of the same order of magnitude.…”

Section: Comparison To Modern Organic-carbon-rich Sedimentsmentioning

confidence: 99%