Arid
DOI10.1016/j.palaeo.2012.09.002
A half-million-year record of paleoclimate from the Lake Manix Core, Mojave Desert, California
Reheis, Marith C.1; Bright, Jordon2; Lund, Steve P.3; Miller, David M.4; Skipp, Gary1; Fleck, Robert J.4
通讯作者Reheis, Marith C.
来源期刊PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
EISSN1872-616X
出版年2012
卷号365页码:11-37
英文摘要

Pluvial lakes in the southwestern U.S. responded sensitively to past climate through effects on rainfall, runoff, and evaporation. Although most studies agree that pluvial lakes in the southwestern U.S. reached their highest levels coeval with glacial stages, the specific timing of increased effective moisture and lake-level rise is debated, particularly for the southwesternmost lakes. We obtained a 45-m core of lacustrine sediment from Lake Manix, the former terminus of the Mojave River prior to about 25 ka, and supplemented data from the core with outcrop studies. These sediments provide a robust record of Mojave River discharge over the last half-million years. Lake Manix persisted from OIS 12 through early OIS 2, including during interstadial OIS 3 and interglacials OIS 5, 7, and 9. The ostracode faunal record displays a shift from an unexpectedly warm, summer-dominated lake hydrology during OIS 12 to predominantly colder, winter-dominated conditions afterwards. The ostracode-based stable isotope record displays a large degree of intra-sample variability and does not mimic other well-known isotopic records of climate change. Evaporation likely buffered the Manix delta O-18 record from most of the expected isotopic differences between interglacial and glacial-interval discharge. Isotopically depleted and stable lakes occurred only four to six times, most notably during OIS 7 and OIS 9. Internal drainage-basin changes also affected the isotopic record. Persistence of lakes in the Manix basin during interglacials requires atmospheric or oceanic circulation controls on the mean position of the Pacific storm track other than large ice sheets. We propose that the relative strength and sign of the Northern Annular Mode (NAM) and its influence on atmospheric river-derived precipitation is a potential explanation. Published by Elsevier B.V.


英文关键词Paleoclimate Pluvial lake Mojave Desert Ostracodes Stable isotopes
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000312183500002
WOS关键词SANTA-BARBARA BASIN ; STABLE-ISOTOPE COMPOSITION ; WESTERN NORTH-AMERICA ; SOUTHERN CALIFORNIA ; LATE PLEISTOCENE ; CLIMATE-CHANGE ; GREAT-BASIN ; OWENS LAKE ; BONNEVILLE BASIN ; EXTREME PRECIPITATION
WOS类目Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS研究方向Physical Geography ; Geology ; Paleontology
来源机构University of Arizona ; United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174323
作者单位1.US Geol Survey, Fed Ctr, Denver, CO 80225 USA;
2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA;
3.Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA;
4.US Geol Survey, Menlo Pk, CA 94025 USA
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GB/T 7714
Reheis, Marith C.,Bright, Jordon,Lund, Steve P.,et al. A half-million-year record of paleoclimate from the Lake Manix Core, Mojave Desert, California[J]. University of Arizona, United States Geological Survey,2012,365:11-37.
APA Reheis, Marith C.,Bright, Jordon,Lund, Steve P.,Miller, David M.,Skipp, Gary,&Fleck, Robert J..(2012).A half-million-year record of paleoclimate from the Lake Manix Core, Mojave Desert, California.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,365,11-37.
MLA Reheis, Marith C.,et al."A half-million-year record of paleoclimate from the Lake Manix Core, Mojave Desert, California".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 365(2012):11-37.
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