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The Records of Environmental Changes in Lacustrine–Swamp Sequences within the Mountain Area of Iturup Island since the Late Glacial Period.

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Title: The Records of Environmental Changes in Lacustrine–Swamp Sequences within the Mountain Area of Iturup Island since the Late Glacial Period.
Authors: Razjigaeva, N. G.1 (AUTHOR) nadyar@tigdvo.ru, Ganzey, L. A.1 (AUTHOR), Grebennikova, T. A.1 (AUTHOR), Mokhova, L. M.1 (AUTHOR), Degterev, A. V.2 (AUTHOR), Ezhkin, A. K.2 (AUTHOR), Rybin, A. V.2 (AUTHOR), Arslanov, Kh. A.3 (AUTHOR), Maksimov, F. E.3 (AUTHOR), Petrov, A. Yu.3 (AUTHOR)
Source: Russian Journal of Pacific Geology. Apr2022, Vol. 16 Issue 2, p116-130. 15p.
Subject Terms: *Glaciation, *Pleistocene-Holocene boundary, *Younger Dryas, *Snow cover, *Islands, *Tundras, *Cyclogenesis
Geographic Terms: Kuril Islands (Russia)
Abstract: We have received unique material on the development of the natural environment for the last 12 400 cal. yr. BP in the central part of Iturup Island. High-resolution paleoreconstructions have been based on the multi-proxy study of paleolake sediments found on the plateau (height 400–420 m) located northwest of the Baransky Volcano. For the first time, a record of paleogeographic events has been obtained for the Late Glacial and the Early Holocene. The age model is based on nine radiocarbon dates. Diatom analysis has made it possible to distinguish 11 stages of lake–swamp evolution. The paleolake reached its maximum depth at ~9890–7900 cal. yr. BP and became extinct at 1400 cal. yr. BP. The vegetation development stages and the landscape change factors have been restored. The Younger Dryas cooling recorded in Iturup was characterized by humidity changes. The role of forest vegetation rapidly increased at the Pleistocene–Holocene boundary of ~11 470 cal. yr. BP under warmer climatic conditions. Distribution of dwarf pine as an indicator of stable snow cover has been analyzed. Dark-coniferous forests existed in the mountainous part of the island since the Late Glacial and were the most widespread in the Early Holocene. The onset of birch forest expansion at 6200 cal. yr. BP was related to the intensification of volcanic activity and frequent ash falls. A number of identified cold events were enhanced by the weakening of the warm Soya Current. The intensive transfer of allochthonous pollen from the southern Kuril Islands and the Japanese Islands at 3540 cal. yr. BP is a sign of cyclogenesis intensification in the Kuril Islands. The Holocene climatic rhythms in the landscape development of the Iturup mountains, as well as the influence of warm and cold currents and other regional factors, have been analyzed. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Label: Title
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  Data: The Records of Environmental Changes in Lacustrine–Swamp Sequences within the Mountain Area of Iturup Island since the Late Glacial Period.
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  Data: <searchLink fieldCode="AR" term="%22Razjigaeva%2C+N%2E+G%2E%22">Razjigaeva, N. G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> nadyar@tigdvo.ru</i><br /><searchLink fieldCode="AR" term="%22Ganzey%2C+L%2E+A%2E%22">Ganzey, L. A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Grebennikova%2C+T%2E+A%2E%22">Grebennikova, T. A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Mokhova%2C+L%2E+M%2E%22">Mokhova, L. M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Degterev%2C+A%2E+V%2E%22">Degterev, A. V.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ezhkin%2C+A%2E+K%2E%22">Ezhkin, A. K.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rybin%2C+A%2E+V%2E%22">Rybin, A. V.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Arslanov%2C+Kh%2E+A%2E%22">Arslanov, Kh. A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maksimov%2C+F%2E+E%2E%22">Maksimov, F. E.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Petrov%2C+A%2E+Yu%2E%22">Petrov, A. Yu.</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Russian+Journal+of+Pacific+Geology%22">Russian Journal of Pacific Geology</searchLink>. Apr2022, Vol. 16 Issue 2, p116-130. 15p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink><br />*<searchLink fieldCode="DE" term="%22Pleistocene-Holocene+boundary%22">Pleistocene-Holocene boundary</searchLink><br />*<searchLink fieldCode="DE" term="%22Younger+Dryas%22">Younger Dryas</searchLink><br />*<searchLink fieldCode="DE" term="%22Snow+cover%22">Snow cover</searchLink><br />*<searchLink fieldCode="DE" term="%22Islands%22">Islands</searchLink><br />*<searchLink fieldCode="DE" term="%22Tundras%22">Tundras</searchLink><br />*<searchLink fieldCode="DE" term="%22Cyclogenesis%22">Cyclogenesis</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Kuril+Islands+%28Russia%29%22">Kuril Islands (Russia)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: We have received unique material on the development of the natural environment for the last 12 400 cal. yr. BP in the central part of Iturup Island. High-resolution paleoreconstructions have been based on the multi-proxy study of paleolake sediments found on the plateau (height 400–420 m) located northwest of the Baransky Volcano. For the first time, a record of paleogeographic events has been obtained for the Late Glacial and the Early Holocene. The age model is based on nine radiocarbon dates. Diatom analysis has made it possible to distinguish 11 stages of lake–swamp evolution. The paleolake reached its maximum depth at ~9890–7900 cal. yr. BP and became extinct at 1400 cal. yr. BP. The vegetation development stages and the landscape change factors have been restored. The Younger Dryas cooling recorded in Iturup was characterized by humidity changes. The role of forest vegetation rapidly increased at the Pleistocene–Holocene boundary of ~11 470 cal. yr. BP under warmer climatic conditions. Distribution of dwarf pine as an indicator of stable snow cover has been analyzed. Dark-coniferous forests existed in the mountainous part of the island since the Late Glacial and were the most widespread in the Early Holocene. The onset of birch forest expansion at 6200 cal. yr. BP was related to the intensification of volcanic activity and frequent ash falls. A number of identified cold events were enhanced by the weakening of the warm Soya Current. The intensive transfer of allochthonous pollen from the southern Kuril Islands and the Japanese Islands at 3540 cal. yr. BP is a sign of cyclogenesis intensification in the Kuril Islands. The Holocene climatic rhythms in the landscape development of the Iturup mountains, as well as the influence of warm and cold currents and other regional factors, have been analyzed. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1134/S1819714022020087
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 116
    Subjects:
      – SubjectFull: Glaciation
        Type: general
      – SubjectFull: Pleistocene-Holocene boundary
        Type: general
      – SubjectFull: Younger Dryas
        Type: general
      – SubjectFull: Snow cover
        Type: general
      – SubjectFull: Islands
        Type: general
      – SubjectFull: Tundras
        Type: general
      – SubjectFull: Cyclogenesis
        Type: general
      – SubjectFull: Kuril Islands (Russia)
        Type: general
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      – TitleFull: The Records of Environmental Changes in Lacustrine–Swamp Sequences within the Mountain Area of Iturup Island since the Late Glacial Period.
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              Text: Apr2022
              Type: published
              Y: 2022
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