Arid
DOI10.1007/s10933-016-9939-6
Late Quaternary TEX86 paleotemperatures from the world's largest desert lake, Lake Turkana, Kenya
Morrissey, Amy1,3; Scholz, Christopher A.1; Russell, James M.2
通讯作者Scholz, Christopher A.
会议名称6th International Limnogeology Congress (ILIC) of the International-Association-of-Limnogeology (IAL)
会议日期JUN 15-19, 2015
会议地点Reno, NV
英文摘要

Wetter climatic conditions prevailed across northern and Equatorial Africa during the terminal Pleistocene until the middle Holocene, a climate event known as the "African Humid Period" (AHP). Although hydrologic changes during this period are well-known, very few records of temperature are available for evaluating the mechanisms and dynamics of climate change during the AHP across tropical Africa. To quantify changes in temperature during the onset and termination of the AHP, the TEX86 temperature proxy was used to generate a 14,000 year record of the surface temperature of Lake Turkana. This biomarker and related measures have been used to reconstruct regional and high-latitude paleotemperatures from the oceans and other continental systems, including other large African lakes. Although Lake Turkana's climate and hydrology are very different from other large African lakes, our reconstruction exhibits a temperature history that shares a number of climatic trends with previous reconstructions. The TEX86 temperatures from Lake Turkana from 14 to 0.4 ka range from 24.3 to 28.6 A degrees C, with a gradual decrease in temperature from early to late Holocene. This cooling roughly follows northern hemisphere summer insolation, similar to the trend observed in Lake Victoria and other regional records. However, the record from Turkana contains many abrupt temperature shifts not seen in other large lakes in the region. Multi-century-scale fluctuations persist through most of the record, and can be attributed to periods of lake mixing. Larger temperature perturbations are likely associated with changes in evaporation and cloud cover.


英文关键词East Africa TEX86 Paleotemperature Lake Turkana Quaternary paleoclimatology
来源出版物JOURNAL OF PALEOLIMNOLOGY
ISSN0921-2728
EISSN1573-0417
出版年2018
卷号59
期号1
页码103-117
出版者SPRINGER
类型Article;Proceedings Paper
语种英语
国家USA
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000419899700007
WOS关键词ISOPRENOID TETRAETHER LIPIDS ; LATE PLEISTOCENE DESICCATION ; TEMPERATURE VARIABILITY ; EAST-AFRICA ; SEDIMENTS ; CALIBRATION ; CLIMATE ; PALEOTHERMOMETER ; TANGANYIKA ; EVOLUTION
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary ; Limnology
WOS研究方向Environmental Sciences & Ecology ; Geology ; Marine & Freshwater Biology
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/307475
作者单位1.Syracuse Univ, Dept Earth Sci, Syracuse, NY 13244 USA;
2.Brown Univ, Dept Earth Environm & Planetary Sci, Box 1846, Providence, RI 02912 USA;
3.ConocoPhillips Co, 600 N Dairy Ashford, Houston, TX 77079 USA
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Morrissey, Amy,Scholz, Christopher A.,Russell, James M.. Late Quaternary TEX86 paleotemperatures from the world's largest desert lake, Lake Turkana, Kenya[C]:SPRINGER,2018:103-117.
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