Now showing 1 - 7 of 7
  • 2016Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","41"],["dc.bibliographiccitation.journal","Quaternary Science Reviews"],["dc.bibliographiccitation.lastpage","53"],["dc.bibliographiccitation.volume","135"],["dc.contributor.author","Wegwerth, Antje"],["dc.contributor.author","Kaiser, Jerome"],["dc.contributor.author","Dellwig, Olaf"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Nowaczyk, Norbert R."],["dc.contributor.author","Arz, Helge W."],["dc.date.accessioned","2018-11-07T10:17:35Z"],["dc.date.available","2018-11-07T10:17:35Z"],["dc.date.issued","2016"],["dc.description.abstract","The Marine Isotope Stage (MIS) 3 stands out due to its abrupt changes from cold and dry stadials to warm and humid interstadials, the so-called Dansgaard-Oeschger cycles that also affected temperature and rainfall in the Black Sea region. This study is based on a gravity core from the southeastern (SE) Black Sea that covers the last glacial lake stage from 64 to 20 ka BP. By using the composition of major and trace elements in the sediments, terrestrial plant-derived n-alkane flux, and Sr/Ca from benthic ostracods, we reconstruct the variability of riverine and aeolian input, salinity, and productivity in the SE Black Sea region in response to the Northern Hemisphere climate oscillations. During colder and drier stadials, the aeolian input increased relative to the riverine discharge, potentially due to southward shifted and/or stronger westerly winds and due to changes in the vegetation cover. An evaporation exceeding freshwater supply by rainfall and rivers possibly caused higher salinity and a lower lake level. The environmental status during MIS 4 and 2 is very much comparable with the stadial conditions during MIS 3. During warmer and more humid interstadials, lower salinity and presumably positive lake level changes most likely resulted from increased precipitation and river discharge. This likely increased primary productivity through an augmented nutrient supply. Lowest average salinities are suggested for the middle part of MIS 3 in response to enhanced meltwater from the disintegrating Fennoscandian Ice Sheet and/or by generally more humid conditions. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.quascirev.2016.01.016"],["dc.identifier.isi","000372376200003"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41258"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0277-3791"],["dc.title","Northern hemisphere climate control on the environmental dynamics in the glacial Black Sea \"Lake\""],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","939"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","CLIMATE OF THE PAST"],["dc.bibliographiccitation.lastpage","954"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Fleitmann, Dominik"],["dc.contributor.author","Nowaczyk, N. R."],["dc.contributor.author","Behling, Hermann"],["dc.contributor.author","Marret, Fabienne"],["dc.contributor.author","Wegwerth, Antje"],["dc.contributor.author","Arz, Helge W."],["dc.date.accessioned","2018-11-07T09:46:01Z"],["dc.date.available","2018-11-07T09:46:01Z"],["dc.date.issued","2014"],["dc.description.abstract","High-resolution pollen and dinoflagellate cyst records from sediment core M72/5-25-GC1 were used to reconstruct vegetation dynamics in northern Anatolia and surface conditions of the Black Sea between 64 and 20 ka BP. During this period, the dominance of Artemisia in the pollen record indicates a steppe landscape and arid climate conditions. However, the concomitant presence of temperate arboreal pollen suggests the existence of glacial refugia in northern Anatolia. Long-term glacial vegetation dynamics reveal two major arid phases similar to 64-55 and 40-32 ka BP, and two major humid phases similar to 54-45 and 28-20 ka BP, correlating with higher and lower summer insolation, respectively. Dansgaard-Oeschger (D-O) cycles are clearly indicated by the 25-GC1 pollen record. Greenland interstadials are characterized by a marked increase in temperate tree pollen, indicating a spread of forests due to warm/wet conditions in northern Anatolia, whereas Greenland stadials reveal cold and arid conditions as indicated by spread of xerophytic biomes. There is evidence for a phase lag of similar to 500 to 1500 yr between initial warming and forest expansion, possibly due to successive changes in atmospheric circulation in the North Atlantic sector. The dominance of Pyxidinopsis psilata and Spiniferites cruciformis in the dinocyst record indicates brackish Black Sea conditions during the entire glacial period. The decrease of marine indicators (marine dinocysts, acritarchs) at similar to 54 ka BP and increase of freshwater algae (Pediastrum, Botryococcus) from 32 to 25 ka BP reveals freshening of the Black Sea surface water. This freshening is possibly related to humid phases in the region, to connection between Caspian Sea and Black Sea, to seasonal freshening by floating ice, and/or to closer position of river mouths due to low sea level. In the southern Black Sea, Greenland interstadials are clearly indicated by high dinocyst concentrations and calcium carbonate content, as a result of an increase in primary productivity. Heinrich events show a similar impact on the environment in the northern Anatolia/Black Sea region as Greenland stadials."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2013"],["dc.identifier.doi","10.5194/cp-10-939-2014"],["dc.identifier.isi","000338761600002"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10124"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34767"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1814-9332"],["dc.relation.issn","1814-9324"],["dc.rights","CC BY 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/3.0"],["dc.title","Orbital- and millennial-scale environmental changes between 64 and 20 ka BP recorded in Black Sea sediments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]
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  • 2012Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","177"],["dc.bibliographiccitation.journal","Palaeogeography Palaeoclimatology Palaeoecology"],["dc.bibliographiccitation.lastpage","193"],["dc.bibliographiccitation.volume","337"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Tarasov, Pavel E."],["dc.contributor.author","Arz, Helge W."],["dc.contributor.author","Fleitmann, Dominik"],["dc.contributor.author","Marret, Fabienne"],["dc.contributor.author","Nowaczyk, Norbert"],["dc.contributor.author","Plessen, Birgit"],["dc.contributor.author","Schluetz, Frank"],["dc.contributor.author","Behling, Hermann"],["dc.date.accessioned","2018-11-07T09:09:14Z"],["dc.date.available","2018-11-07T09:09:14Z"],["dc.date.issued","2012"],["dc.description.abstract","Sediments from the Black Sea, a region historically dominated by forests and steppe landscapes, are a valuable source of detailed information on the changes in regional terrestrial and aquatic environments at decadal to millennial scales. Here we present multi-proxy environmental records (pollen, dinoflagellate cysts, Ca, Ti and oxygen isotope data) from the uppermost 305 cm of the core 22-GC3 (42 degrees 13.53'N, 36 degrees 29.55'E) collected from a water depth of 838 m in the southern part of the Black Sea in 2007. The records span the last similar to 18 kyr (all ages are given in cal kyr BP). The pollen data reveal the dominance of the Artemisia-steppe in the region, suggesting rather dry/cold environments similar to 18-14.5 kyr BP. Warming/humidity increase during melt-water pulses (similar to 16.1-14.5 kyr BP), indicated by delta O-18 records from the 22-GC3 core sediment and from the Sofular Cave stalagmite, is expressed in more negative delta C-13 values from the Sofular Cave, usually interpreted as the spreading of C3 plants. The records representing the interstadial complex (similar to 14.5-12.9 kyr BP) show an increase in temperature and moisture, indicated by forest development, increased primary productivity and reduced surface run-off, whereas the switch from primary terrigenous to primary authigenic Ca origin occurs similar to 500 yr later. The Younger Dryas cooling is clearly demonstrated by more negative delta C-13 values from the Sofular Cave and a reduction of pines. The early Holocene (11.7-8.5 kyr BP) interval reveals relatively dry conditions compared to the mostly moist and warm middle Holocene (8.5-5 kyr BP), which is characterized by the establishment of the species-rich warm mixed and temperate deciduous forests in the low elevation belt, temperate deciduous beech-hornbeam forests in the middle and cool conifer forest in upper mountain belt. The border between the early and middle Holocene in the vegetation records coincides with the opening of the Mediterranean corridor at similar to 8.3 kyr BP, as indicated by a marked change in the dinocyst assemblages and in the sediment lithology. Changes in the pollen assemblages indicate a reduction in forest cover after similar to 5 kyr BP, which was likely caused by increased anthropogenic pressure on the regional vegetation. (C) 2012 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.palaeo.2012.04.015"],["dc.identifier.isi","000306032100015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26212"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1872-616X"],["dc.relation.issn","0031-0182"],["dc.title","Vegetation and environmental dynamics in the southern Black Sea region since 18 kyr BP derived from the marine core 22-GC3"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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  • 2013Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","349"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Quaternary Research"],["dc.bibliographiccitation.lastpage","360"],["dc.bibliographiccitation.volume","80"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Arz, Helge W."],["dc.contributor.author","Wegwerth, Antje"],["dc.contributor.author","Fleitmann, Dominik"],["dc.contributor.author","Marret, Fabienne"],["dc.contributor.author","Nowaczyk, Norbert"],["dc.contributor.author","Tarasov, Pavel E."],["dc.contributor.author","Behling, Hermann"],["dc.date.accessioned","2018-11-07T09:17:57Z"],["dc.date.available","2018-11-07T09:17:57Z"],["dc.date.issued","2013"],["dc.description.abstract","This multiproxy study on SE Black Sea sediments provides the first detailed reconstruction of vegetation and environmental history of Northern Anatolia between 134 and 119 ka. Here, the glacial-interglacial transition is characterized by several short-lived alternating cold and warm events preceding a meltwater pulse (similar to 130.4-131.7 ka). The latter is reconstructed as a cold arid period correlated to Heinrich event 11. The initial warming is evidenced at similar to 130.4 ka by increased primary productivity in the Black Sea, disappearance of ice-rafted detritus, and spreading of oaks in Anatolia. A Younger Dryas-type event is not identifiable. The Eemian vegetation succession corresponds to the main climatic phases in Europe: i) the Quercus-Juniperus phase (128.7-126.4 ka) indicates a dry continental climate; ii) the Ostrya-Corylus-Quercus-Carpinus phase (126.4-122.9 ka) suggests warm summers, mild winters, and high year-round precipitation; iii) the Fagus-Caipinus phase (122.9-119.5 ka) indicates cooling and high precipitation; and iv) increasing Pinus at similar to 121 ka marks the onset of cooler/drier conditions. Generally, pollen reconstructions suggest altitudinal/latitudinal migrations of vegetation belts in Northern Anatolia during the Eemian caused by increased transport of moisture. The evidence for the wide distribution of Fagus around the Black Sea contrasts with the European records and is likely related to climatic and genetic factors. (C) 2013 University of Washington. Published by Elsevier Inc All rights reserved."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [BE 2116/20-1, SPP 1266]"],["dc.identifier.doi","10.1016/j.yqres.2013.07.005"],["dc.identifier.isi","000327285500001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28294"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1096-0287"],["dc.relation.issn","0033-5894"],["dc.title","Vegetation and environmental changes in Northern Anatolia between 134 and 119 ka recorded in Black Sea sediments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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  • 2013Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","146"],["dc.bibliographiccitation.journal","Marine Micropaleontology"],["dc.bibliographiccitation.lastpage","160"],["dc.bibliographiccitation.volume","101"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Marret, Fabienne"],["dc.contributor.author","Fleitmann, Dominik"],["dc.contributor.author","Arz, Helge W."],["dc.contributor.author","Nowaczyk, Norbert"],["dc.contributor.author","Behling, Hermann"],["dc.date.accessioned","2018-11-07T09:24:53Z"],["dc.date.available","2018-11-07T09:24:53Z"],["dc.date.issued","2013"],["dc.description.abstract","In order to compare the sea-surface conditions in the Black Sea during the Holocene and Eemian, sapropelic parts of marine core 22-GC3 (42 degrees 13.53'N/36 degrees 29.55'E, 838 m water depth) were studied for organic-walled dinoflagellate cyst content. The record shows a change from freshwater/brackish assemblages (Pyxidinopsis psilata, Spiniferites cruciformis, and Caspidinium rugosum) to more marine assemblages (Lingulodinium machaerophorum and Spiniferites ramosus complex) during each interglacial, due to the inflow of saline Mediterranean water. The lacustrine-marine transitions in 22-GC3 occurred at similar to 8.3 cal kyr BP during the early Holocene and similar to 128 kyr BP during the early Eemian, slightly later compared to the onset of interglacial conditions on the adjacent land. Dinoflagellate cyst assemblages reveal higher sea-surface salinity (similar to 28-30) (e.g. Spiniferites pachydermus, Bitectatodinium tepikiense, and Spiniferites mirabilis) around similar to 126.5-121 kyr BP in comparison to the Holocene (similar to 15-20) as well as relatively high sea-surface temperature (e.g. Tuberculodinium vancampoae, S. pachydermus, and S. mirabilis) especially at similar to 127.6-125.3 kyr BP. Establishment of high sea-surface salinity during the Eemian correlates very well with reconstructed relatively high global sea-level and is explained as a combined effect of increased Mediterranean supply and high temperatures at the beginning of the last interglacial. The observed changes in the dinocyst record highlight the importance of nutrients for the composition of the Eemian and Holocene dinocyst assemblages. (C) 2013 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.marmicro.2013.02.001"],["dc.identifier.isi","000321536700012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29937"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1872-6186"],["dc.relation.issn","0377-8398"],["dc.title","Eemian and Holocene sea-surface conditions in the southern Black Sea: Organic-walled dinoflagellate cyst record from core 22-GC3"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article Research Paper
    [["dc.bibliographiccitation.firstpage","124"],["dc.bibliographiccitation.journal","Earth and Planetary Science Letters"],["dc.bibliographiccitation.lastpage","135"],["dc.bibliographiccitation.volume","404"],["dc.contributor.author","Wegwerth, Antje"],["dc.contributor.author","Dellwig, Olaf"],["dc.contributor.author","Kaiser, Jerome"],["dc.contributor.author","Menot, Guillemette"],["dc.contributor.author","Bard, Edouard"],["dc.contributor.author","Shumilovskikh, Lyudmila S."],["dc.contributor.author","Schnetger, Bernhard"],["dc.contributor.author","Kleinhanns, Ilka C."],["dc.contributor.author","Wille, Martin"],["dc.contributor.author","Arz, Helge W."],["dc.date.accessioned","2018-11-07T09:33:37Z"],["dc.date.available","2018-11-07T09:33:37Z"],["dc.date.issued","2014"],["dc.description.abstract","The last glacial-interglacial transition or Termination I (T I) is well documented in the Black Sea, whereas little is known about climate and environmental dynamics during the penultimate Termination (T II). Here we present a multi-proxy study based on a sediment core from the SE Black Sea covering the penultimate glacial and almost the entire Eemian interglacial ((133.5 +/- 0.7)-(122.5 +/- 1.7) ka BP). Proxies comprise ice-rafted debris (IRD), O and Sr isotopes as well as Sr/Ca, Mg/Ca, and U/Ca ratios of benthic ostracods, organic and inorganic sediment geochemistry, as well as TEX86 and U-37(K') derived water temperatures. The ending penultimate glacial (MIS 6, 133.5 to 129.9 +/- 0.7 ka BP) is characterised by mean annual lake surface temperatures of about 9 degrees C as estimated from the TEX86 palaeothermometer. This period is impacted by two Black Sea melt water pulses (BSWP-II-1 and 2) as indicated by very c low Sr/Ca-ostracods but high sedimentary K/Al values. Anomalously high radiogenic Sr-87/S-86(ostracod) values (max. 0.70945) during BSWP-II-2 suggest a potential Himalayan source communicated via the Caspian Sea. The T II warming started at 129.9 +/- 0.7 ka BP, witnessed by abrupt disappearance of IRD, increasing delta O-18(ostracod) values, and a first TEX86 derived temperature rise of about 2.5 degrees C. A second, abrupt warming step to ca. 15.5 degrees C as the prelude of the Eemian warm period is documented at 128.3 ka BR The Mediterranean-Black Sea reconnection most likely occurred at 128.1 +/- 0.7 ka BP as demonstrated by increasing Sr/Ca-ostracods and U/Ca-ostracods values. The disappearance of ostracods and TOC contents > 2% document the onset of Eemian sapropel formation at 127.6 ka BP. During sapropel formation, TEX86 temperatures dropped and stabilised at around 9 degrees C, while U-37(K') temperatures remain on average 17 degrees C. This difference is possibly caused by a habitat shift of Thaumarchaeota communities from surface towards nutrient-rich deeper and colder waters located above the gradually establishing halo- and redoxcline. (C) 2014 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.epsl.2014.07.030"],["dc.identifier.isi","000343352100012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32009"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1385-013X"],["dc.relation.issn","0012-821X"],["dc.title","Meltwater events and the Mediterranean reconnection at the Saalian-Eemian transition in the Black Sea"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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  • 2014Journal Article Research Paper
    [["dc.bibliographiccitation.journal","Palaeogeography Palaeoclimatology Palaeoecology"],["dc.bibliographiccitation.volume","393"],["dc.contributor.author","Shumilovskikh, L. S."],["dc.contributor.author","Tarasov, Pavel E."],["dc.contributor.author","Arz, Helge W."],["dc.contributor.author","Fleitmann, Dominik"],["dc.contributor.author","Marret, Fabienne"],["dc.contributor.author","Nowaczyk, Norbert"],["dc.contributor.author","Plessen, Birgit"],["dc.contributor.author","Schluetz, Frank"],["dc.contributor.author","Behling, Hermann"],["dc.date.accessioned","2018-11-07T09:46:39Z"],["dc.date.available","2018-11-07T09:46:39Z"],["dc.date.issued","2014"],["dc.format.extent","159"],["dc.identifier.doi","10.1016/j.palaeo.2013.11.016"],["dc.identifier.isi","000331024900013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/34924"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1872-616X"],["dc.relation.issn","0031-0182"],["dc.title","Vegetation and environmental dynamics in the southern Black Sea region since 18 kyr BP derived from the marine core 22-GC3 (vol 337, pg 177, 2012)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]
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