DOI: 10.1016/j.quascirev.2018.12.002
Scopus记录号: 2-s2.0-85058506660
论文题名: Quantitative estimates of orbital and millennial scale climatic variability in central Mexico during the last ∼40,000 years
作者: Caballero M. ; Lozano-García S. ; Ortega-Guerrero B. ; Correa-Metrio A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 205 起始页码: 62
结束页码: 75
语种: 英语
英文关键词: Diatoms
; Late Pleistocene
; Micropaleontology
; Monsoon
; North America
; Paleoclimatology
; Paleolimnology
; Transfer functions
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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117403
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
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]. Quaternary Science Reviews,2019-01-01,205