Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1700327114 |
Mio-Pliocene aridity in the south-central Andes associated with Southern Hemisphere cold periods | |
Amidon, William H.1; Fisher, G. Burch2,3; Burbank, Douglas W.3; Ciccioli, Patricia L.4; Alonso, Ricardo N.5; Gorin, Andrew L.1; Silverhart, Perri H.1; Kylander-Clark, Andrew R. C.3; Christoffersen, Michael S.2 | |
2017-06-20 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2017 |
卷号 | 114期号:25页码:6474-6479 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Argentina |
英文摘要 | Although Earth's climate history is best known through marine records, the corresponding continental climatic conditions drive the evolution of terrestrial life. Continental conditions during the latest Miocene are of particular interest because global faunal turnover is roughly synchronous with a period of global glaciation from similar to 6.2-5.5 Ma and with the Messinian Salinity Crisis from similar to 6.0-5.3 Ma. Despite the climatic and ecological significance of this period, the continental climatic conditions associated with it remain unclear. We address this question using erosion rates of ancient watersheds to constrain Mio-Pliocene climatic conditions in the south-central Andes near 30 degrees S. Our results show two slow-downs in erosion rate, one from similar to 6.1-5.2 Ma and another from 3.6 to 3.3 Ma, which we attribute to periods of continental aridity. This view is supported by synchrony with other regional proxies for aridity and with the timing of glacial "cold" periods as recorded by marine proxies, such as the M2 isotope excursion. We thus conclude that aridity in the south-central Andes is associated with cold periods at high southern latitudes, perhaps due to a northward migration of the Southern Hemisphere westerlies, which disrupted the South American Low Level Jet that delivers moisture to southeastern South America. Colder glacial periods, and possibly associated reductions in atmospheric CO2, thus seem to be an important driver of Mio-Pliocene ecological transitions in the central Andes. Finally, this study demonstrates that paleo-erosion rates can be a powerful proxy for ancient continental climates that lie beyond the reach of most lacustrine and glacial archives. |
英文关键词 | Messinian Miocene Pliocene M2 precipitation |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403687300027 |
WOS关键词 | STABLE ISOTOPIC EVIDENCE ; LOW-LEVEL JET ; LATE MIOCENE ; ATMOSPHERIC CO2 ; CLIMATE-CHANGE ; SEA-LEVEL ; ARGENTINE PRECORDILLERA ; EROSION RATES ; C-4 GRASSES ; THRUST BELT |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204737 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Middlebury Coll, Geol Dept, Middlebury, VT 05753 USA; 2.Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA; 3.Univ Calif Santa Barbara, Earth Sci Inst, Santa Barbara, CA 93106 USA; 4.Univ Buenos Aires, Consejo Nacl Invest Cient & Tecn, Fac Ciencias Exactas & Nat,Dept Ciencias Geol, Inst Geociencias Basicas Aplicadas & Ambientales, C1428EHA, Buenos Aires, DF, Argentina; 5.Univ Nacl Salta, Consejo Nacl Invest Cient & Tecn, Inst Super Correlac Geol, RA-4400 Salta, Argentina |
推荐引用方式 GB/T 7714 | Amidon, William H.,Fisher, G. Burch,Burbank, Douglas W.,et al. Mio-Pliocene aridity in the south-central Andes associated with Southern Hemisphere cold periods[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(25):6474-6479. |
APA | Amidon, William H..,Fisher, G. Burch.,Burbank, Douglas W..,Ciccioli, Patricia L..,Alonso, Ricardo N..,...&Christoffersen, Michael S..(2017).Mio-Pliocene aridity in the south-central Andes associated with Southern Hemisphere cold periods.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(25),6474-6479. |
MLA | Amidon, William H.,et al."Mio-Pliocene aridity in the south-central Andes associated with Southern Hemisphere cold periods".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.25(2017):6474-6479. |
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