Инд. авторы:	Zhao J., Chu G., Wang S., Sun Q., Dong H., Darin A.V.
Заглавие:	N-alkane distribution and their paleoenvironmental implications during holocene in lacustrine sediments in lake shuang, xinjiang
Библ. ссылка:	Zhao J., Chu G., Wang S., Sun Q., Dong H., Darin A.V. N-alkane distribution and their paleoenvironmental implications during holocene in lacustrine sediments in lake shuang, xinjiang // Quaternary Science. - 2021. - Т.41. - № 4. - С.965-975. - ISSN 1001-7410.
Внешние системы:	DOI: 10.11928/j.issn.1001.7410.2021.04.07; РИНЦ: 47004927;
Реферат:	eng: The Altai Mountains are located at the junction of Asia and Europe. It is far away from oceans, and typical temperate continental climate. Moisture sources are mainly from the Atlantic and Arctic Oceans, as well as from recycled moisture from the Mediterranean Sea, the Caspian Sea and the Black Sea in the middle latitude. It is one of the key regions to study paleoclimate change. Here, we present a paleoclimatic and paleoenvironmental record from the sediments of Lake Shuang. Lake Shuang(48°52'N, 87° 02'E) is located in the middle of the Altai Mountains and was formed by the landslide damming of a valley. The lake is about 1200m in length, 300m in width, and a maximum depth of 9m. Sediment cores were collected by using a gravity corer and obtained a 172cm sediment profile without disturbance. The chronology of sediment cores during the past 9.1cal.kaB.P. is based on radiometric dating data such as137Cs,210Pb and AMS14C. The n-alkane proxies such as average chain length(ACL23~33), grass/tree ratio(nC27/nC31) and Paq ratio(Aquatic Plant n-alkane Proxy) were used to reconstruct vegetation and climate changes over the past 9.1cal.kaB.P. The result indicates that the sediments are dominated by middle-and long-chain n-alkanes in the range of nC23~nC33 with a strong odd over even carbon number predominance. There is a strong correlation among ACL23~33, nC27/nC31 and Paq, which may suggest that these proxies may be affected by the similar climate driving factors and reflect the succession history of vegetation. The n-alkane proxies suggests less input of aquatic vegetation in the sediment in the interval of 9.1~8.8cal.kaB.P., followed by an increase of herbaceous and aquatic plants between 8.8cal.kaB.P. and 3.3cal.kaB.P., while a decrease of woody plants and increase of herbaceous plants after ca. 3.3cal.kaB.P. The ACL23~33 values show an increasing trend over the past 9.1cal.kaB.P. that suggest a warming trend since the Early Holocene. Although it is similar with previous br-GDGT-based temperature reconstruction from our study region, it is not well correlated at centennial-millennial time scale probably due to uncertainties in proxy sensitivity and chronology.
Ключевые слова:	holocene; Altai mountains; distribution; n-Alkane; Lake Shuang;
Издано:	2021
Физ. характеристика:	с.965-975
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