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| Titel |
High resolution paleoenvironment reconstruction for Lake Khanka since the last glacial maximum |
| VerfasserIn |
Yanguang Liu, Jiaojie Chen, Shulan Ge, Chaoxin Li |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094885
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| Publikation (Nr.) |
 EGU/EGU2014-10320.pdf |
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| Zusammenfassung |
| Abstract: A novel sedimentary sequence is presented based on sediment core in the Khanka
Lake (XKH1, collected form the small Khanka Lake) by using of paleomagnetic
stratigraphy, grain size and organic geochemical data. The sedimentary history
of XKH1 is distinctly retrieved to 24 ka BP by comparing with the geomagnetic
inclination lows recorded in XKH1 and Lake Biwa. Multi-proxies paleoenvironmental
reconstruction for Lake Khanka since the last glacial maximum (LGM) by grain size, total
organic carbon (TOC), magnetic susceptibility (MS), and color reflectance. During 24
and 19.5 ka BP, Lake Khanka experienced low lake level and cooling-wet climate
approved by the decreasing mean grain size, high sediment brightness and MS values,
and low TOC value. The relatively high sand fraction and slightly variation also
indicate a low lake condition between 19.5 and 15 ka BP. High TOC content and
marked variation in others proxies represent a peat swamp deposition environment
during 19 and 16 ka BP, which may associated with lower precipitation and probably
modulated by the restrained Asian summer monsoon. From 16 to 15 ka BP, the
lake condition change to cold-dry and the sediment has lower content of TOC and
coarser grain size. During the deglaciation, together with global temperature rising,
the effective precipitation increase around Lake Khanka, result in rising of lake
level. The fluctuating characteristics of the environment sensitive grain content are
corresponding well to the Oldest Dryas/Bolling-Allerod/Younger Dryas periods.
Since 10.6 ka BP, the lake level slightly declining under warm climate because a
successive sand bar developed between the small Khanka Lake and the main water area. |
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