DOI: 10.5194/tc-15-1383-2021
论文题名: Giant dust particles at Nevado Illimani: A proxy of summertime deep convection over the Bolivian Altiplano
作者: Lindau F.G.L. ; Simões J.C. ; Delmonte B. ; Ginot P. ; Baccolo G. ; Paleari C.I. ; Di Stefano E. ; Korotkikh E. ; Introne D.S. ; Maggi V. ; Garzanti E. ; Andò S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 3 起始页码: 1383
结束页码: 1397
语种: 英语
英文关键词: atmospheric convection
; atmospheric deposition
; climate change
; climate oscillation
; dust
; mineral dust
; paleoclimate
; paleoenvironment
; precipitation (climatology)
; proxy climate record
; stable isotope
; summer
; Altiplano
; Andes
; Bolivia
; Illimani
; La Paz [Bolivia]
英文摘要: A deeper understanding of past atmospheric circulation variability in the Central Andes is a high-priority topic in paleoclimatology mainly because of the necessity to validate climate models used to predict future precipitation trends and to develop mitigation and/or adaptation strategies for future climate change scenarios in this region.Within this context, we here investigate an 18-year firn core drilled at Nevado Illimani in order to interpret its mineral dust record in relation to seasonal processes, in particular atmospheric circulation and deep convection. The core was dated by annual layer counting based on seasonal oscillations of dust, calcium, and stable isotopes. Geochemical and mineralogical data show that dust is regionally sourced in winter and summer. During austral summer (wet season), an increase in the relative proportion of giant dust particles (20 um) is observed, in association with oscillations of stable isotope records (D, 18O). It seems that at Nevado Illimani both the deposition of dust and the isotopic signature of precipitation are influenced by atmospheric deep convection, which is also related to the total amount of precipitation in the area. This hypothesis is corroborated by regional meteorological data. The interpretation of giant particle and stable isotope records suggests that downdrafts due to convective activity promote turbulent conditions capable of suspending giant particles in the vicinity of Nevado Illimani. Giant particles and stable isotopes, when considered together, can be therefore used as a new proxy for obtaining information about deep convective activity in the past. © 2021 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164742
Appears in Collections: 气候变化与战略
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作者单位: Centro Polar e Climático, Universidade Federal do Rio Grande do sul, Porto Alegre, 91501-970, Brazil; Climate Change Institute, University of Maine, Orono, ME 04469, United States; Department of Environmental and Earth Sciences, University of Milano-Bicocca, Milan, 20126, Italy; Univ. Grenoble Alpes, CNRS, Ird, Grenoble INP, Ige, Grenoble, 38000, France
Recommended Citation:
Lindau F.G.L.,Simões J.C.,Delmonte B.,et al. Giant dust particles at Nevado Illimani: A proxy of summertime deep convection over the Bolivian Altiplano[J]. Cryosphere,2021-01-01,15(3)