DOI: 10.1016/j.quascirev.2016.11.021
Scopus记录号: 2-s2.0-84998854585
论文题名: Holocene climatic variations in the Western Cordillera of Colombia: A multiproxy high-resolution record unravels the dual influence of ENSO and ITCZ
作者: Muñoz P. ; Gorin G. ; Parra N. ; Velásquez C. ; Lemus D. ; Monsalve M.C. ; Jojoa M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 155 起始页码: 159
结束页码: 178
语种: 英语
英文关键词: Humidity
; Iron
; Palaeoenvironmemt
; Pollen
; Rainfall
; Temperature
; Titanium
; Wavelet analysis
; X-ray fluorescence
; Younger Dryas
Scopus关键词: Atmospheric humidity
; Climate change
; Iron
; Rain
; Spectrum analysis
; Temperature
; Titanium
; Wavelet analysis
; Highest resolutions
; Mean annual temperatures
; Palaeoenvironmemt
; Pollen
; Sedimentary sequence
; Temperature and humidities
; X ray fluorescence
; Younger Dryas
; Climatology
英文摘要: The Páramo de Frontino (3460 m elevation) in Colombia is located approximately halfway between the Pacific and Atlantic oceans. It contains a 17 kyr long, stratigraphically continuous sedimentary sequence dated by 30 AMS 14C ages. Our study covers the last 11,500 cal yr and focuses on the biotic (pollen) and abiotic (microfluorescence-X or μXRF) components of this high mountain ecosystem. The pollen record provides a proxy for temperature and humidity with a resolution of 20–35 yr, and μXRF of Ti and Fe is a proxy for rainfall with a sub-annual (ca. 6-month) resolution. Temperature and humidity display rapid and significant changes over the Holocene. The rapid transition from a cold (mean annual temperature (MAT) 3.5 °C lower than today) and wet Younger Dryas to a warm and dry early Holocene is dated at 11,410 cal yr BP. During the Holocene, MAT varied from ca. 2.5 °C below to 3.5° above present-day temperature. Warm periods (11,410–10,700, 9700–6900, 4000–2400 cal yr BP) were separated by colder intervals. The last 2.4 kyr of the record is affected by human impact. The Holocene remained dry until 7500 cal yr BP. Then, precipitations increased to reach a maximum between 5000 and 4500 cal yr BP. A rapid decrease occurred until 3500 cal yr BP and the late Holocene was dry. Spectral analysis of μXRF data show rainfall cyclicity at millennial scale throughout the Holocene, and at centennial down to ENSO scale in more specific time intervals. The highest rainfall intervals correlate with the highest activity of ENSO. Variability in solar output is possibly the main cause for this millennial to decadal cyclicity. We interpret ENSO and ITCZ as the main climate change-driving mechanisms in Frontino. Comparison with high-resolution XRF data from the Caribbean Cariaco Basin (a proxy for rainfall in the coastal Venezuelian cordilleras) demonstrates that climate in Frontino was Pacific-driven (ENSO-dominated) during the YD and early Holocene, whereas it was Atlantic-driven in Cariaco (ITCZ-dominated). From ca. 8000 cal yr BP, climate in both areas was under the dual influence of ENSO and ITCZ, thereby showing existing teleconnections between the tropical Pacific and Atlantic oceans. The Frontino record is to date the highest-resolution Holocene study in NW Colombia. An implication of these results is that new records should be analyzed with multiproxy tools, in particular those providing high resolution time series, such as μXRF. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59351
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Earth Sciences, Earth and Environmental Science Section, University of Geneva, Rue des Maraîchers 13, Geneva, Switzerland; Facultad de Ciencias, Universidad Nacional de Colombia, Sede Medellin, Calle 59A, No. 63-20, Medellin, Colombia; Facultad de Estadística, Universidad Santo Tomás, Carrera 9, No. 51-11, Bogotá, Colombia
Recommended Citation:
Muñoz P.,Gorin G.,Parra N.,et al. Holocene climatic variations in the Western Cordillera of Colombia: A multiproxy high-resolution record unravels the dual influence of ENSO and ITCZ[J]. Quaternary Science Reviews,2017-01-01,155