排序方式: 共有10条查询结果,搜索用时 15 毫秒
1
1.
2.
A. V. Lozhkin P. M. Anderson T. V. Matrosova P. S. Minyuk J. Brigham-Grette M. Melles 《Russian Journal of Pacific Geology》2007,1(6):550-555
The comprehensive study of the upper 1283 cm of sediment from Lake El’gygytgyn, which formed nearly 4 Ma ago following a meteorite impact in northern Chukotka, yielded the first continuous record of the extreme changes in the Beringian climate and vegetation from the middle Middle Pleistocene to recent time (equivalent of marine isotope stages of 1–7 and the upper part of isotope stage 8). During this period, the climate was warmer than at present between 8600 and 10 7000 14C years and during the Late Pleistocene (isotope substage 5e, 116–128 ka ago). In 2003, the German-Russian-USA expedition continued studying sediments of Lake El’gygytgyn to obtain new evidence of the change in the vegetation cover in the Middle Pleistocene and the first information on the Middle Pleistocene interglacial (isotope stage 9; 297–347 ka ago). Pollen spectra characterizing the Middle Pleistocene interglacial are similar to spectra of the early stage of the Early Pleistocene interglacial and the climatic optimum in the Pleistocene to Holocene transitional period. The climatic history of Lake El’gygytgyn is basic for stratigraphic interpretations and correlations in the eastern sector of the Arctic. These data also expand our understanding of climatic changes that are studied within the framework of the “Pole-Equator-Pole Paleoclimate,” “Past Global Changes,” and other international projects. 相似文献
3.
4.
A. V. Lozhkin P. M. Anderson T. V. Matrosova P. S. Minyuk 《Journal of Paleolimnology》2007,37(1):135-153
Three types of pollen assemblages (shrub-dominated, mixed herb- and shrub-dominated, and herb-dominated) characterize the
~ 300,000 year palynological record from El’gygytgyn Lake. Despite major changes in global climatic forcings, all pollen spectra,
with a few isolated exceptions, have strong to possible analogs in the modern plant communities of Northeast Siberia and Alaska.
Paleoclimatic reconstructions based on squared chord-distance analog analyses indicate two periods (~8600–10,700 14C year B.P. and OIS 5e) when summers were perhaps ~2 to 4°C warmer than modern. January temperatures were also warmer than
present, and both July and January were wetter than today. Palynological data remain inconclusive as to the establishment
of forests near El’gygytgyn Lake at these times. The wettest Julys occurred during OIS 5 d. July temperatures were near modern,
and Januarys were colder and drier than now. January temperatures, even into the Middle Pleistocene, generally show little
variability, suggesting that the suppression of arboreal taxa during glaciations was likely caused by cool summers with low
effective moisture and not by frigid winters. Because age schemes that correlate magnetic susceptibility to variations in
summer insolation or ∂18O have cool plant taxa persisting in warm times (and vice versa), we propose an alternative age model based on the palynological
data.
Electronic Supplementary Material Supplementary material is available to authorised users in the online version of this article at .
This is the first in a series of eleven papers published in this special issue dedicated to initial studies of El’gygytgyn Crater Lake and
its catchment in NE Russia. Julie Brigham-Grette, Martin Melles, Pavel Minyuk were guest editors of this special issue. 相似文献
5.
Bondur V. G. Zamshin V. V. Chvertkova O. I. Matrosova E. R. Khodaeva V. N. 《Izvestiya Atmospheric and Oceanic Physics》2021,57(9):937-949
Izvestiya, Atmospheric and Oceanic Physics - This paper presents the results of integrated space studies of the environmental emergency near the Kamchatka Peninsula which caused the mass death of... 相似文献
6.
7.
Ivanov A. Yu. Matrosova E. R. Kucheiko A. Yu. Filimonova N. A. Evtushenko N. V. Terleeva N. V. Libina N. V. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1590-1604
Izvestiya, Atmospheric and Oceanic Physics - Results are presented from research aimed at detecting natural seepage and oil seeps in the seas of Russia using synthetic aperture radar (SAR) imaging.... 相似文献
8.
Zamshin V. V. Matrosova E. R. Morozov E. G. Spiridonov V. A. Frey D. I. Kharchenko V. D. Khodaeva V. N. Chvertkova O. I. Shlyupikov V. A. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(12):1731-1740
Izvestiya, Atmospheric and Oceanic Physics - During cruise 79 of R/V Akademik Mstislav Keldysh in the Atlantic Antarctic, information is supplied using optical and radar high-, mid-, and... 相似文献
9.
10.
1