Reconstruction of Palaeoecological and Palaeoclimatic Conditions of the Holocene in the South of Taimyr Peninsula According to the Analysis of Lake Sediments
L. S. SYRYKH1, L. B. NAZAROVA2,3,4, U. HERZSCHUH2,3, D. A. SUBETTO5,4, I. M. GREKOV1
1Herzen State Pedagogical University of Russia, 191186, Saint-Petersburg, emb. Moika, 48
2University of Potsdam, 14476, Potsdam-Golm, Karl-Liebknecht str. 24-25
3Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, 14473, Potsdam, Telegrafenberg, A43
4Kazan (Volga) Federal University, 420000, Kazan, Kremlevskaya str., 18
5Northern Water Problems Institute of the Karelian Research Centre RAS, 185003, Petrozavodsk, Alexander Nevsky ave., 50
Keywords: Chironomidae, палеолимнология, голоцен, реконструкции климата, Российская Арктика, Хатанга, Chironomidae, palaeolimnology, Holocene, climate reconstruction, Russian Arctic, Khatanga
Abstract
We studied a sediment core from the lake Khatanga-12 (Taimyr Peninsula, Krasnoyarsk region). The core is 131.5 cm long and covers ca of 7100 years of sedimentation. In this study we performed a chironomid analysis, made a qualitative reconstruction of the paleoenvironment in the region and quantitative reconstructions of mean-July air temperature and lake water depth using Russian regional statistical chironomid-based models [Nazarova et al., 2008, 2011, 2015]. The lake was formed during the mid-Holocene warming as a result of thermokarst processes. Development of the ecosystem of the lake Khatanga-12 was influenced by climatic factors and cryolithogenic processes. Mid-Holocene warming around 7100-6500 cal. yrs BP activated thermokarst processes and resulted in formation of the lake basin. Cooling was reconstructed between 6500 and 4500 cal. yrs BP. The sediments of the lake during this period have been formed by erosion processes of the lake banks. After 2500 cal. yrs BP reconstructed conditions are close to modern.
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