globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.11.012
Scopus记录号: 2-s2.0-84998773554
论文题名:
Two millennia of Mesoamerican monsoon variability driven by Pacific and Atlantic synergistic forcing
作者: Lachniet M.S.; Asmerom Y.; Polyak V.; Bernal J.P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 155
起始页码: 100
结束页码: 113
语种: 英语
英文关键词: El Niño/Southern Oscillation ; Mesoamerica ; Mexico Paleoclimate ; Monsoon ; North Atlantic Oscillation
Scopus关键词: Atmospheric pressure ; Atmospheric thermodynamics ; Calibration ; Drought ; Nickel ; Population statistics ; Urban growth ; Eastern pacific Ocean ; High pressure system ; Intertropical convergence zone ; Mesoamerica ; Monsoon ; North Atlantic oscillations ; Paleoclimates ; Population expansion ; Oceanography
英文摘要: The drivers of Mesoamerican monsoon variability over the last two millennia remain poorly known because of a lack of precisely-dated and climate-calibrated proxy records. Here, we present a new high resolution (∼2 yrs) and precisely-dated (± 4 yr) wet season hydroclimate reconstruction for the Mesoamerican sector of the North American Monsoon over the past 2250 years based on two aragonite stalagmites from southwestern Mexico which replicate oxygen isotope variations over the 950–1950 CE interval. The reconstruction is quantitatively calibrated to instrumental rainfall variations in the Basin of Mexico. Comparisons to proxy indices of ocean-atmosphere circulation show a synergistic forcing by the North Atlantic and El Niño/Southern Oscillations, whereby monsoon strengthening coincided with a La Niña-like mode and a negative North Atlantic Oscillation, and vice versa for droughts. Our data suggest that weak monsoon intervals are associated with a strong North Atlantic subtropical high pressure system and a weak Intertropical convergence zone in the eastern Pacific Ocean. Population expansions at three major highland Mexico civilization of Teotihuacan, Tula, and Aztec Tenochtitlan were all associated with drought to pluvial transitions, suggesting that urban population growth was favored by increasing freshwater availability in the semi-arid Mexican highlands, and that this hydroclimatic change was controlled by Pacific and Atlantic Ocean forcing. © 2016 Elsevier Ltd
资助项目: This research was supported by NSF grants AGS-1003558 (to MSL) and 1003233 (to YA & VP), the National Geographic Society (grant # 8828-10 to MSL), and facilities grants EAR-0521196 (UNLV) and EAR-0326902 (UNM). We acknowledge the valued collaboration of Prof. A. Ortega, and Laura Rosales-Lagarde and Keith Christenson for field work help and surveying. The JX chronology will be deposited at the NOAA Palaeoclimatology data repository at http://www.ncdc.noaa.gov/paleo/paleo.html. We thank two anonymous reviewers whose comments substantially improved the manuscript.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59350
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作者单位: Department of Geoscience, University of Nevada Las Vegas, 4505 Maryland Pkwy, Las Vegas, NV, United States; Department of Earth and Planetary Science, University of New Mexico, 200 Yale Blvd. NE, Albuquerque, NM, Mexico; Centro de Geociencias, UNAM Campus Juriquilla, Blvd. Juriquilla 3001, Juriquilla, Querétaro, Mexico

Recommended Citation:
Lachniet M.S.,Asmerom Y.,Polyak V.,et al. Two millennia of Mesoamerican monsoon variability driven by Pacific and Atlantic synergistic forcing[J]. Quaternary Science Reviews,2017-01-01,155
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