Climatic forcing of eastern Mediterranean deep-water formation and benthic ecosystems during the past 22 000 years

Schmiedl, Gerhard; Kuhnt, Tanja; Ehrmann, Werner; Emeis, Kay–Christian; Hamann, Yvonne; Kotthoff, Ulrich; Dulski, Peter; Pross, Joerg

doi:10.1016/j.quascirev.2010.07.002

Cited by 144 publications

(187 citation statements)

References 104 publications

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“…However, the increased abundance of B. spathulata could also be related to nutrient influx derived from the continent as has been observed by other authors (i.e. Duchemin et al, 2008;Schmiedl et al, 2010). (Haunold et al, 1997;Rezqi et al, 2000;Duchemin et al, 2008).…”

supporting

confidence: 57%

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Pérez-Asensio

Aguirre

Schmiedl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Benthic foraminiferal assemblages of a drill core from the lower Guadalquivir Basin (northern Gulf of Cádiz, SW Spain) have been analysed in order to reconstruct the paleoenvironmental evolution in the vicinity of the Betic seaways during the Messinian. The core consists of marine sediments ranging from the latest Tortonian to the early Pliocene. Changes in the abundance of certain marker species, planktonic/benthic ratio (P/B ratio), paleodepth estimated with a transfer function, content of sand grains and presence of glauconitic layers indicate a complete transgressive-regressive sea-level cycle from the bottom to the top of the section. An abrupt sea-level rise, from inner-middle shelf to middle slope, is recorded at the lowermost part of the core (latest Tortonian-earliest Messinian), followed by a relatively rapid shallowing from middle slope to outer shelf. Magnetobiostratigraphic data show These assemblages are dominated by Nonion fabum and Bulimina elongata, two taxa that are able to feed from continental low-quality organic matter, most likely derived from river run-off. The paleoenviromental evolution on the Atlantic side of Betic and Rifian seaways is similar during the Messinian, with a Messinian continuous sea-level lowering driven by regional tectonic uplift and upwelling-related waters reaching the upper slope. This study will further contribute to understand the role of tectonics on the sea-level changes as well as on the closure of the Atlantic-Mediterranean gateways that led to the MSC, and on the paleoceanography on the Atlantic sides of these corridors.

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supporting

confidence: 57%

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Pérez-Asensio

Aguirre

Schmiedl

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Despite this increasing humidity during the early Holocene, which incidentally coincides partly with the formation of sapropel 1a between ca. 10 000 and 8200 cal yr BP in the Mediterranean Sea (Emeis et al, 2000;Mercone et al, 2000;Kotthoff et al, 2008b;Schmiedl et al, 2010), K and Fe imply decreasing catchment erosion until 9000 cal yr BP. Less input from the catchment could be due to denser vegetation in the littoral areas and catchment, which while filtering clastic material might cause greater delivery of more allochthonous OM to the lake, as indicated by increasing TOC/TN.…”

Section: A Francke Et Al: a Late Glacial To Holocene Record Of Envimentioning

confidence: 99%

“…The low temperatures are most likely associated with the 8.2 ka cooling event, which covers a broad period in Mediterranean paleoclimate records varying between 8500 and 8000 cal yr BP (e.g., Magny et al, 2003 and references therein;Rohling and Palike, 2005;Berger and Guilaine, 2009 and references therein). The 8.2 ka cooling is associated with an interruption of the sapropel 1 formation in the Mediterranean Sea (e.g., Kotthoff et al, 2008b;Schmiedl et al, 2010;Siani et al, 2012) and a hydrological tripartition of Europe. Whilst wet conditions have predominated between 43 to 50 • N, dry conditions persisted north and south of this corridor (Magny et al, 2003), which is in line with low lake level and dry conditions at Lake Dojran.…”

Section: A Francke Et Al: a Late Glacial To Holocene Record Of Envimentioning

confidence: 99%

A Late Glacial to Holocene record of environmental change from Lake Dojran (Macedonia, Greece)

et al. 2013

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A Late Glacial to Holocene sediment sequence (Co1260, 717 cm) from Lake Dojran, located at the boarder of the F.Y.R. of Macedonia and Greece, has been investigated to provide information on climate variability in the Balkan region. A robust age-model was established from 13 radiocarbon ages, and indicates that the base of the sequence was deposited at ca. 12 500 cal yr BP, when the lake-level was low. Variations in sedimentological (H₂O, TOC, CaCO₃, TS, TOC/TN, TOC/TS, grain-size, XRF, δ¹⁸O_carb, δ¹³C_carb, δ¹³C_org) data were linked to hydro-acoustic data and indicate that warmer and more humid climate conditions characterised the remaining period of the Younger Dryas until the beginning of the Holocene. The Holocene exhibits significant environmental variations, including the 8.2 and 4.2 ka cooling events, the Medieval Warm Period and the Little Ice Age. Human induced erosion processes in the catchment of Lake Dojran intensified after 2800 cal yr BP

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“…The increase in runoff due to repeated seasonal floods over four successive periods of ∼220 y raised the BS water level by around 100 m, until the sill of the Bosphorus Strait was reached (12,13,16,44,45), leading to the flooding of the vast northwestern shelf of the BS basin and the attendant drastic retreat of the coastline (SI Text). The resulting outflow of BS waters into the northeastern Mediterranean basins altered the hydrology of both the Marmara Sea (45) and the Aegean Sea (46,47). In the Aegean Sea, a drop in deep-water oxygenation is recorded during HS1 (46,47), suggesting that the reduction in the formation of North Aegean deep water could have been caused by the injection of fresh water from the BS.…”

Section: Regional Climate Forcingsmentioning

confidence: 99%

“…The resulting outflow of BS waters into the northeastern Mediterranean basins altered the hydrology of both the Marmara Sea (45) and the Aegean Sea (46,47). In the Aegean Sea, a drop in deep-water oxygenation is recorded during HS1 (46,47), suggesting that the reduction in the formation of North Aegean deep water could have been caused by the injection of fresh water from the BS. Further investigation in the Eastern Mediterranean Sea is needed to evaluate the complex interactions between the BS outflow and the Mediterranean thermohaline circulation.…”

Section: Regional Climate Forcingsmentioning

confidence: 99%

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Soulet

Ménot

Bayon

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Continental ice sheets are a key component of the Earth's climate system, but their internal dynamics need to be further studied. Since the last deglaciation, the northern Eurasian Fennoscandian Ice Sheet (FIS) has been connected to the Black Sea (BS) watershed, making this basin a suitable location to investigate former icesheet dynamics. Here, from a core retrieved in the BS, we combine the use of neodymium isotopes, high-resolution elemental analysis, and biomarkers to trace changes in sediment provenance and river runoff. We reveal cyclic releases of meltwater originating from Lake Disna, a proglacial lake linked to the FIS during Heinrich Stadial 1. Regional interactions within the climate-lake-FIS system, linked to changes in the availability of subglacial water, led to abrupt drainage cycles of the FIS into the BS watershed. This phenomenon raised the BS water level by ∼100 m until the sill of the Bosphorus Strait was reached, flooding the vast northwestern BS shelf and deeply affecting the hydrology and circulation of the BS and, probably, of the Marmara and Aegean Seas.ice dynamics | meltwater routing | European hydrographic network

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Climatic forcing of eastern Mediterranean deep-water formation and benthic ecosystems during the past 22 000 years

Cited by 144 publications

References 104 publications

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

Messinian paleoenvironmental evolution in the lower Guadalquivir Basin (SW Spain) based on benthic foraminifera

A Late Glacial to Holocene record of environmental change from Lake Dojran (Macedonia, Greece)

Abrupt drainage cycles of the Fennoscandian Ice Sheet

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