DOI: 10.1016/j.gloplacha.2015.10.003
论文题名: High-resolution speleothem record of precipitation from the Yucatan Peninsula spanning the Maya Preclassic Period
作者: Medina-Elizalde M. ; Burns S.J. ; Polanco-Martínez J.M. ; Beach T. ; Lases-Hernández F. ; Shen C.-C. ; Wang H.-C.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 138 起始页码: 93
结束页码: 102
语种: 英语
英文关键词: Maya
; Oxygen isotopes
; Precipitation
; Preclassic Period
; Speleothem
; Stalagmite
Scopus关键词: Isotopes
; Precipitation (chemical)
; Storms
; Maya
; Oxygen isotopes
; Preclassic Period
; Speleothem
; Stalagmite
; Precipitation (meteorology)
英文摘要: We produced a new high-resolution absolute U-Th dated stalagmite oxygen isotope record (δ18O) from Río Secreto, Playa del Carmen, Yucatan Peninsula (YP). This new 1434-year stalagmite record (named Itzamna after the Maya god of creation) spans the time interval between BCE 1037 and CE 397 with an average resolution of 8 ± 2 years. It provides a novel view of climate evolution over the Preclassic and early Classic periods in Maya history. To understand the controls of regional precipitation δ18O on seasonal time scales, we characterized the amount effect between precipitation amount (P) and precipitation δ18O (δP). We found that precipitation δ18O in the Yucatan Peninsula is controlled by the amount effect on seasonal scales (δP/δP = -0.0137 ± 0.0031‰ per mm, r = 0.9), as suspected but never before demonstrated. Cave drip δ18O is consistent with the annual amount-weighted δ18O composition of precipitation. Multiple lines of evidence suggest that stalagmite δ18O reflects isotopic equilibrium conditions and thus stalagmite δ18O changes are interpreted to reflect precipitation amount. We determined quantitative precipitation changes from the stalagmite δ18O record following previous methods (Medina-Elizalde and Rohling, 2012). The stalagmite precipitation record suggests twelve periods of anomalous precipitation reductions ranging between about 30 and 70% below mean conditions at the time and with durations from 6 years to 31 years. Between BCE 520 and 166, the speleothem precipitation record suggests that the YP experienced an interval of high precipitation labeled the Late Preclassic Humid Period (LPHP) with precipitation maxima of up to +86 ± 20%. Preclassic Maya cultural expansion in El Mirador Basin, located in northern Guatemala, took place while the peninsula transitioned from the LPHP to an interval with below average precipitation. We find that the Preclassic abandonment of major centers in the Mirador Basin and others around the Maya Lowlands was synchronous with two unprecedented multi-decadal events of severe precipitation reduction with magnitudes of -55 ± 13% and -49 ± 12 and centered at CE 186 and 234, respectively. We also find evidence that centennial scale precipitation variability in the YP during the Preclassic Period may have been associated with shifts in rainfall fluxes from Atlantic tropical cyclones. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975745682&doi=10.1016%2fj.gloplacha.2015.10.003&partnerID=40&md5=4e825f4479687f7065988e27eefcb1e0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11702
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Geology, Amherst College, Amherst, MA, United States
Recommended Citation:
Medina-Elizalde M.,Burns S.J.,Polanco-Martínez J.M.,et al. High-resolution speleothem record of precipitation from the Yucatan Peninsula spanning the Maya Preclassic Period[J]. Global and Planetary Change,2016-01-01,138.