- Tytuł:
- Vegetation and climate changes at the eemian/weichselian transition : new palynological data from central Russian plain
- Autorzy:
- Borisova, O. K.
- Powiązania:
- https://bibliotekanauki.pl/articles/1186124.pdf
- Data publikacji:
- 2005
- Wydawca:
- Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
- Tematy:
-
palynology
Eemian/Weichselian transition
Central Russian Plain - Opis:
- Palynological analysis of core Butovka obtained from the Protva River basin 80 km south-west of Moscow (55 stopni10'N, 36 stopni 25'E) provides a record of vegetation and climate change in the central Russian Plain spanning the Last Interglacial and the beginning of the following glacial epoch. Pollen profiles of the Mikulino (Eemian) Interglaciation in the Central Russian Plain show a distinctive pattern of the vegetation changes, reflecting an increase in temperatures towards the optimum phase of the interglaciation followed by a gradual cooling. Rapid climatic deterioration, manifesting an onset of the Valdai (Weichselian) Glaciation, took place after a slower cooling accompanied by increasing humidity of climate during the post-optimum part of the Mikulino Interglaciation. The interglacial/glacial transition had a complex structure, being marked by a sequence of secondary climatic oscillations of varying magnitude. A decreasing role of mesophilic plants and an increase in abundance and diversity of the xerophytes and plants growing at present in the regions with highly continental climate in the Butovka pollen record suggests that during the Early Valdai the climate grew both more continental and arid. With this tendency at the background, two intervals of climatic amelioration can be distinguished. Both of them are marked by the development of the open forest communities similar to the contemporary northern taiga of West Siberia. The latter of the two warm intervals had a larger magnitude of temperature changes than the first one, as indicated by a greater landscape role of dark-coniferous trees (Picea + Abies + Pinus sibirica). Based on its stratigraphic position and inferred features of climate and vegetation, the latter of the two warm intervals identified in the Butovka pollen profile can be correlated with the Upper Volga Interstade in the Russian Plain, or the Brőrup Interstade in West Europe. We can also tentatively correlate it with warm DO event 23 as reflected in the oxygen isotope record from the Northern Greenland deep ice-core (North GRIP Members, 2004). A slighter and shorter warming within the first cold stage of the Early Valdai probably had an interphasial rank and corresponded to a shorter DO event 24 in the NorthGRIP oxygen-isotope curve.
- Źródło:
-
Polish Geological Institute Special Papers; 2005, 16; 9--17
1507-9791 - Pojawia się w:
- Polish Geological Institute Special Papers
- Dostawca treści:
- Biblioteka Nauki
Artykuł