• shareshare
  • link
  • cite
  • add
auto_awesome_motion View all 8 versions
Publication . Article . Other literature type . 2014

Orbital- and millennial-scale environmental changes between 64 and 20 ka BP recorded in Black Sea sediments

Lyudmila S. Shumilovskikh; Dominik Fleitmann; Norbert R Nowaczyk; Hermann Behling; Fabienne Marret; Antje Wegwerth; Helge W Arz;
Open Access
Published: 01 Jan 2014

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 ~64–55 and 40–32 ka BP, and two major humid phases ~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 ~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 ~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. Open-Access-Publikationsfonds 2013 peerReviewed

Subjects by Vocabulary

Library of Congress Subject Headings: lcsh:Environmental pollution lcsh:TD172-193.5 lcsh:Environmental protection lcsh:TD169-171.8 lcsh:Environmental sciences lcsh:GE1-350

Microsoft Academic Graph classification: Brackish water Geology Glacial period Oceanography Sea level Steppe geography.geographical_feature_category geography Pollen medicine.disease_cause medicine Dinocyst Stadial Pediastrum biology.organism_classification biology


vegetation dynamics; environmental changes, 550 Earth sciences & geology, Paleontology, Stratigraphy, Global and Planetary Change

106 references, page 1 of 11

Abrantes, F., Voelker, A. H. L., Sierro, F. J., Naughton, F., Rodrigues, T., Cacho, I., Ariztegui, D., Brayshaw, D., Sicre, M.-A., and Batista, L.: Paleoclimate variability in the Mediterranean Region, in: The Climate of the Mediterranean Region: from the past to the future, edited by: Lionello, P., Elsevier, London, UK, 1-86, 2012.

Akçar, N. and Schlüchter, C.: Paleoglaciations in Anatolia: a Schematic Review and First Results, Eiszeitalter Gegenwart, 55, 102-121, 2005. [OpenAIRE]

Akçar, N., Yavuz, V., Ivy-Ochs, S., Kubik, P. W., Vardar, M., and Schlüchter, C.: Paleoglacial records from Kavron Valley, NE Turkey: Field and cosmogenic exposure dating evidence, Quatern. Int., 164-165, 170-183, 2007.

Akçar, N., Yavuz, V., Ivy-Ochs, S., Kubik, P. W., Vardar, M., and Schlüchter, C.: A case for a downwasting mountain glacier during Termination I, Verçenik valley, northeastern Turkey, J. Quaternary Sci., 23, 273-285, 2008.

Allen, J. R. M., Brandt, U., Brauer, A., Hubberten, H.-W., Huntley, B., Keller, J., Kraml, M., Mackensen, A., Mingram, J., Negendank, J. F. M., Nowaczyk, N. R., Oberhänsli, H., Watts, W. A., Wulf, S., and Zolitschka, B.: Rapid environmental changes in southern Europe during the last glacial period, Nature, 400, 740-743, 1999.

Allen, J. R. M., Watts, W. A., and Huntley, B.: Weichselian palynostratigraphy, palaeovegetation and palaeoenvironment; the record from Lago Grande di Monticchio, southern Italy, Quatern. Int., 73-74, 91-110, 2000.

Arslanov, K. A., Dolukhanov, P. M., and Gei, N. A.: Climate, Black Sea levels and human settlements in Caucasus Littoral 50,000- 9000 BP, Quatern. Int., 167-168, 121-127, 2007. [OpenAIRE]

Arz, H. W., Lamy, F., Ganopolski, A., Nowaczyk, N., and Pätzold, J.: Dominant Northern Hemisphere climate control over millennial-scale glacial sea-level variability, Quaternary Sci. Rev., 26, 312-321, 2007. [OpenAIRE]

Atalay, I.: Mountain Ecosystems of Turkey, in: Proceedings of the 7th International Symposium on High Mountain Remote Sensing Cartography, 15-26 July 2002, Bishkek, Kyrgyzstan, 29-38, 2002.

Atanassova, J.: Palaeoecological setting of the western Black Sea area during the last 15,000 years, Holocene, 15, 576-584, 2005. [OpenAIRE]