O. Ogienko1, Assistant, E-mail: email@example.com;
Yu. Tymchenko1, Cand. Sci. (Geol.), Research Associate, E-mail: firstname.lastname@example.org
THE LATE HOLOCENE CLIMATE CHANGE EFFECT
ON SEDIMENTATION ENVIRONMENTS NEAR THE ANTARCTIC PENINSULA
1 Institute of Geology, Taras Schevchenko National University of Kyiv, 90 Vasylkivska Str., Kyiv, 03022 Ukraine
The paper is devoted to the Late Holocene sedimentary paleoenvironments in the open northern part of the Antarctic Peninsula basin that is particularly sensitive to rapid contemporary climate change. The main goal is to trace the successive environmental transformation of hydrological and climatic conditions which affected the Core K98-08 (floor depth 1227 m) deposits formation recorded in proxy diatom data. On the basis of taxonomic composition and ecological structure of fossil diatom assemblages and horizons' lithology, the Late Quaternary paleoenvironmental conditions were defined. The surface sediments were formed in deep ocean basin under the influence of different-temperature water mixture, this basin being characterized by sea ice cover in winter and surface water's average temperatures of -1 – +1,5°C in summer.
The taxonomic composition of diatom assemblages suggests that the surface sediments were formed at the Late Holocene. The comparison of new data with paleoclimatic records [7, 9-10] indicates that the beginning of core deposit accumulation is broadly synchronous with the Neoglacial interval (≤2400 yr BP). According to our rough estimates the average Late Holocene deposition rate was ca. 18-19 cm per 1000 years in the place where the station was located. The present-day rapid warming began about 450-500 yr ago in the Northern Antarctic Peninsula.
This study focuses on new data of the Late Holocene sedimentation rate and environments in the north area of the Antarctic Peninsula basin for a climate and paleoceanological reconstructions in the Southern Ocean.
Keywords: sedimentation, bottom deposits, diatoms, paleoclimate, Holocene, Antarctic.
1. Gozhyk P.F. et al., (1991). Geology and metallogeny of the Southern Ocean [Geologiya i metalogeniya Yuzhnogo okeana]. Kyiv, Naukova Dumka – Scientific thought, p. 192. (In Russian).
2. Kozlova O.G., (1964). Diatoms of the Indian and Pacific sectors of the Antarctic [Diatomovye vodorosli indiyskogo I tihookeanskogo sektorov Antarktiki]. Moscow, Nauka – Science, p. 167. (In Russian).
3. Lisitsyn A.P., (1994). Ice sedimentation in the World's ocean [ledovaya sedimentatsyya v Mirovom okeane]. Moscow, Nauka – Science, p. 448. (In Russian).
4. Pushyna Z.V., (2008). Late Quaternary diatom end evolution of paleogeographic environments in the central sector of East Antarctica [Pozdnechetvertichnye diatomovye vodorosli I evolyutsyyz paleogeograficheskih obstanovok v tsentralnom sektore Vostochnoy Antarctiki]. Avtoreferat dissertatsyi, Sankt-Peterburg. – Thesis of Dr. dissertation. St. Petersburg, p. 20. (In Russian).
5. Armand L., Crosta X., Romero O., Pichon J.-J., (2005). The biogeography of major diatom taxa in Southern Ocean sediments: 1. Sea ice related species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223, 93-126.
6. Armand L., Leventer A., (2003). Palaeo Sea Ice Distribution - Reconstruction and Palaeoclimatic Significance. In Sea Ice: An Introduction to its Physics, Chemistry, Biology and Geology (Chapter 11, 333-372). Ed. by D.N. Thomas& G.S. Dieckmann, p. 416
7. Bak Y.-S. et a., (2007). Diatom evidence for Holocene paleoclimatic change in the South Scotia Sea, West Antarctica. Geosciences Journal, 11, 11-22.
8. Barbara L. Crosta X., Schmidt S., Masse G., (2013). Diatoms and biomarkers evidence for major changes in sea ice conditions prior the instrumental period in Antarctic Peninsula. Quaternary Science Reviews, 79, 99-110.
9. Barnard A., Wellner J.S., Anderson J.B., (2014). Late Holocene climate change recorded in proxy records from a Bransfield Basin sediment core, Antarctic Peninsula. Polar Research, 33, 17236, http://dx.doi.org/10.3402/polar.v33.17236.
10. Bentley M.J. et al., (2009). Mechanisms of holocene palaeoenvironmental change in the Antarctic Peninsula region. The
Holocene, 19 (1), 51-69.
11. Crosta X., Romero O., Armand L., Pichon J.-J., (2005). The biogeography of major diatom taxa in Southern Ocean sediments: 2. Open ocean related species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223, 66-92.
12. Esper O., Gersonde R, Kadagies N., (2010). Diatom distribution in southeastern Pacific surface sediments and their relationship to modern environmental variables. Palaeogeography, Palaeoclimatology, Palaeoecology, 287, 1–27.
13. Gersonde R., Burckle L., (1990). Neogene diatom biostratigraphy of ODP Leg 113, Weddell Sea (Antarctic Ocean). Proceedings of the Ocean Drilling Program, Scientific Results, 113, 761–789.
14. Lee J.I. et al., (2010). Climate changes in the South Orkney Plateau during the last 8600 years. The Holocene, 20 (3), 395–404.
15. Lee J.I. et al., (2012). Late Quaternary glacial–interglacial variations in sediment supply in the southern Drake Passage. Quaternary Research, 78, 119–129.
16. Leventer A., (1998). The fate of Antarctic "sea ice diatoms" and their use as paleoenvironmental indicators. In Antarctic Sea Ice: Biological Processes, Interactions and Variability (Eds. Lizotte M.P., Arrigo K.R.). American Geophysical Union, Washington. D.S. Antarctic research series, 73, 121-137.
17. Romero O.E., Armand L.K., Crosta X., Pichon J.-J., (2005). The biogeography of major diatom taxa in Southern Ocean surface sediments: 3.Tropical/Subtropical species. Palaeogeography, Palaeoclimatology, Palaeoecology, 223, 49-65.
18. Sprenk D., (2013). Palaeoclimate and Ice-Sheet Dynamics in the Southern Ocean. Dissertation zur Erlangung des Doktorgrades der Mathematisch-Naturwissenschaftlichen Fakultät der Universität zu Köln/ Köln, p. 129.
19. Taylor F., Whitehead J., Domack E., (2001). Holocene paleoclimate change in the Antarctic Peninsula: evidence from the diatom, sedimentary and geochemical record. Marine Micropaleontology, 41, 25-43.
20. Yoo K.-C., Yoon H.I., Kim J.-K., Khim B.K., (2009). Sedimentological, geochemical and palaeontological evidence for a neoglacial cold event during the late Holocene in the continental shelf of the northern South Shetland Islands, West Antarctica. Polar Research, 28, 177–192.
21. Yoon H.I. et al., (2007). Late glacial to Holocene climatic and oceanographic record of sediment facies from the South Scotia Sea off the northern Antarctic Peninsula. Deep Sea Research Part II: Topical Studies in Oceanography, 54, 21-22, 2367-2387.