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Title: Implications for conifer glacial refugia and postglacial climatic variation in western Beringia from lake sediments of the Upper Indigirka basin

A c. 13 800 cal. a BP palynological record from Tschuch'ye Lake (eastern Yakutia), when combined with other palaeobotanical records from western Beringia, supports previous conclusions that Larix and Pinus pumila spread from multiple cryptic refugia during the Lateglacial period and middle Holocene, respectively. The antiquity and spatial distribution of Larix in many of these records suggest that full-glacial landscapes probably had a small but important tree component. The Tschuch'ye record further indicates the absence of a Younger Dryas climatic reversal and is in accord with the preponderance of other data from western Beringia, which indicate warmer than present climates between c. 12 900 and 9100 cal. a BP. The subsequent spread of Pinus pumila, which has similar temperature requirements as Larix, denotes a shift to wetter but still warm climates during the middle Holocene, with palynological data suggesting optimal conditions in far western areas of western Beringia c. 7000–5000 cal. a BP. Lastly, the postglacial occurrence of relatively warm/dry and warm/wet intervals is consistent with results of a regional climate-model simulation that indicates warmer than present temperatures and decreased effective moisture at 11 000 cal. a BP and persistence of warm conditions but with greater moisture and longer growingmore » season at 6000 cal. a BP.« less
Authors:
 [1] ; ORCiD logo [2] ;  [1] ;  [1] ;  [3] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Russian Academy of Sciences (RAS), Magadan (Russian Federation). Northeast Interdisciplinary Science Research Inst.
  2. Univ. of Washington, Seattle, WA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-759285
Journal ID: ISSN 0300-9483; 947614
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Boreas
Additional Journal Information:
Journal Volume: 47; Journal Issue: 3; Journal ID: ISSN 0300-9483
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES
OSTI Identifier:
1497945
Alternate Identifier(s):
OSTI ID: 1430745

Lozhkin, Anatoly, Anderson, Patricia, Minyuk, Pavel, Korzun, Julya, Brown, Thomas, Pakhomov, Alexander, Tsygankova, Valeriya, Burnatny, Sergei, and Naumov, Alexey. Implications for conifer glacial refugia and postglacial climatic variation in western Beringia from lake sediments of the Upper Indigirka basin. United States: N. p., Web. doi:10.1111/bor.12316.
Lozhkin, Anatoly, Anderson, Patricia, Minyuk, Pavel, Korzun, Julya, Brown, Thomas, Pakhomov, Alexander, Tsygankova, Valeriya, Burnatny, Sergei, & Naumov, Alexey. Implications for conifer glacial refugia and postglacial climatic variation in western Beringia from lake sediments of the Upper Indigirka basin. United States. doi:10.1111/bor.12316.
Lozhkin, Anatoly, Anderson, Patricia, Minyuk, Pavel, Korzun, Julya, Brown, Thomas, Pakhomov, Alexander, Tsygankova, Valeriya, Burnatny, Sergei, and Naumov, Alexey. 2018. "Implications for conifer glacial refugia and postglacial climatic variation in western Beringia from lake sediments of the Upper Indigirka basin". United States. doi:10.1111/bor.12316. https://www.osti.gov/servlets/purl/1497945.
@article{osti_1497945,
title = {Implications for conifer glacial refugia and postglacial climatic variation in western Beringia from lake sediments of the Upper Indigirka basin},
author = {Lozhkin, Anatoly and Anderson, Patricia and Minyuk, Pavel and Korzun, Julya and Brown, Thomas and Pakhomov, Alexander and Tsygankova, Valeriya and Burnatny, Sergei and Naumov, Alexey},
abstractNote = {A c. 13 800 cal. a BP palynological record from Tschuch'ye Lake (eastern Yakutia), when combined with other palaeobotanical records from western Beringia, supports previous conclusions that Larix and Pinus pumila spread from multiple cryptic refugia during the Lateglacial period and middle Holocene, respectively. The antiquity and spatial distribution of Larix in many of these records suggest that full-glacial landscapes probably had a small but important tree component. The Tschuch'ye record further indicates the absence of a Younger Dryas climatic reversal and is in accord with the preponderance of other data from western Beringia, which indicate warmer than present climates between c. 12 900 and 9100 cal. a BP. The subsequent spread of Pinus pumila, which has similar temperature requirements as Larix, denotes a shift to wetter but still warm climates during the middle Holocene, with palynological data suggesting optimal conditions in far western areas of western Beringia c. 7000–5000 cal. a BP. Lastly, the postglacial occurrence of relatively warm/dry and warm/wet intervals is consistent with results of a regional climate-model simulation that indicates warmer than present temperatures and decreased effective moisture at 11 000 cal. a BP and persistence of warm conditions but with greater moisture and longer growing season at 6000 cal. a BP.},
doi = {10.1111/bor.12316},
journal = {Boreas},
number = 3,
volume = 47,
place = {United States},
year = {2018},
month = {3}
}