气候变化领域集成服务门户(CCPortal): Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40;000 years

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DOI	10.1016/j.quascirev.2018.12.002
	Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40;000 years
	Caballero M.; Lozano-García S.; Ortega-Guerrero B.; Correa-Metrio A.
发表日期	2019
ISSN	0277-3791
起始页码	62
结束页码	75
卷号	205
英文摘要	Diatom-based transfer functions for salinity, precipitation and temperature were developed using a training set that included data from 40 sites along central Mexico. These transfer functions showed good performance parameters and were subsequently applied to the previously published diatom record from lake Chalco, southern Basin of Mexico. Heinrich stadials (HS-3 to HS-0) were reconstructed as cold and dry events, with HS-2 representing the coldest and driest conditions, while HS-1 shows a complex bimodal cooling pattern. Orbital scale variability is also recorded. High and variable lake salinities from ∼34 to 29 ka BP (marine isotope stage 3, MIS-3) corresponded with times of maximum summer insolation and evidences of frequent fires. MIS-2 was identified as a cold period, with low lake salinity associated with low evaporation, with two cold intervals during the minima in spring (∼25.5 ka BP) and summer (∼20 ka BP) insolation. The ∼20 ka BP cold event together with HS-2 (24-23 ka BP), defined a bimodal maximum cooling during the last glacial maximum (LGM: 24.5–19.5 ka BP) within the range of pollen-based estimates, further supporting a maximum tropical cooling of 4–5 °C for the LGM. The deglacial (19.5–11.5 ka BP) showed the highest precipitation anomalies with three peaks that closely correlated with glacier advances in the nearby mountains (Iztaccihuatl). The early Holocene marked a change towards high lake salinities and the highest positive temperature anomalies (+3.5 °C) during a peak in summer insolation. Even though at orbital scale Chalco showed a nearly opposite trend to the record from the more southerly lake Peten-Itza (Guatemala), at millennial scale it showed a common pattern of cold and dry conditions during HSs, comparable to other tropical latitude sites in the northern hemisphere and further supporting the idea that there is a strong coupling between tropical and higher latitudes climates, in particular with the North Atlantic. © 2018 Elsevier Ltd
英文关键词	Diatoms; Late Pleistocene; Micropaleontology; Monsoon; North America; Paleoclimatology; Paleolimnology; Transfer functions
语种	英语
scopus关键词	Glacial geology; Incident solar radiation; Lakes; Paleolimnology; Tropics; Diatoms; Late Pleistocene; Micropaleontology; Monsoon; North America; Paleoclimatology; Transfer functions; climate variation; diatom; micropaleontology; monsoon; paleoclimate; paleolimnology; paleotemperature; Pleistocene; precipitation (climatology); quantitative analysis; salinity; transfer function; Atlantic Ocean; Atlantic Ocean (North); Guatemala [Central America]; Lake Peten Itza; Mexico [North America]; Peten; Valley of Mexico; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152041
作者单位	Laboratorio de Paleolimnología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Ciudad de México, CP 04510, Mexico; Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Ciudad de México, CP 04510, Mexico
推荐引用方式 GB/T 7714	Caballero M.,Lozano-García S.,Ortega-Guerrero B.,et al. Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40;000 years[J],2019,205.
APA	Caballero M.,Lozano-García S.,Ortega-Guerrero B.,&Correa-Metrio A..(2019).Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40;000 years.Quaternary Science Reviews,205.
MLA	Caballero M.,et al."Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40;000 years".Quaternary Science Reviews 205(2019).