Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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 |
ISSN | 0921-2728 |
EISSN | 1573-0417 |
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 |
推荐引用方式 GB/T 7714 | 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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