DOI: 10.5194/tc-7-1481-2013
Scopus记录号: 2-s2.0-84885147418
论文题名: High-resolution provenance of desert dust deposited on Mt. Elbrus, Caucasus in 2009–2012 using snow pit and firn core records
作者: Kutuzov S ; , Shahgedanova M ; , Mikhalenko V ; , Ginot P ; , Lavrentiev I ; , Kemp S
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 5 起始页码: 1481
结束页码: 1498
语种: 英语
英文关键词: air mass
; algorithm
; anthropogenic source
; atmospheric deposition
; atmospheric transport
; desert
; dust
; firn
; ice core
; isotopic analysis
; MODIS
; optical depth
; particle size
; provenance
; SEVIRI
; size distribution
; snow
; surface wind
; Mount Elbrus
英文摘要: The first record of dust deposition events on Mt. Elbrus, Caucasus Mountains derived from a snow pit and a shallow firn core is presented for the 2009-2012 period. A combination of isotopic analysis, SEVIRI red-green-blue composite imagery, MODIS atmospheric optical depth fields derived using the Deep Blue algorithm, air mass trajectories derived using the HYSPLIT model and analyses of meteorological data enabled identification of dust source regions with high temporal (hours) and spatial (ca. 20-100 km) resolution. Seventeen dust deposition events were detected; fourteen occurred in March-June, one in February and two in October. Four events originated in the Sahara, predominantly in northeastern Libya and eastern Algeria. Thirteen events originated in the Middle East, in the Syrian Desert and northern Mesopotamia, from a mixture of natural and anthropogenic sources. Dust transportation from Sahara was associated with vigorous Saharan depressions, strong surface winds in the source region and mid-tropospheric southwesterly flow with daily winds speeds of 20-30 m s-1 at 700 hPa level. Although these events were less frequent than those originating in the Middle East, they resulted in higher dust concentrations in snow. Dust transportation from the Middle East was associated with weaker depressions forming over the source region, high pressure centred over or extending towards the Caspian Sea and a weaker southerly or southeasterly flow towards the Caucasus Mountains with daily wind speeds of 12-18 m s-1 at 700 hPa level. Higher concentrations of nitrates and ammonium characterised dust from the Middle East deposited on Mt. Elbrus in 2009 indicating contribution of anthropogenic sources. The modal values of particle size distributions ranged between 1.98 μm and 4.16 μm. Most samples were characterised by modal values of 2.0-2.8 μm with an average of 2.6 μm and there was no significant difference between dust from the Sahara and the Middle East. © 2013 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74938
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Department of Geography and Environmental Science, Walker Institute for Climate System Research, University of Reading, Reading, RG6AB, United Kingdom; Laboratory of Glaciology, Institute of Geography, Russian Academy of Science, Moscow, Russian Federation; IRD/Univ. Grenoble Alpes/CNRS/Univ, Savoie/INPG/IFSTTAR/CNRM, Observatoire des Sciences de l'Univers de Grenoble (OSUG), Grenoble, 38041, France; Univ. Grenoble Alpes/CNRS, Laboratoire de Glaciologie et Géophysique de l'Environnement (LGGE), UMR5183, Grenoble, 38041, France
Recommended Citation:
Kutuzov S,, Shahgedanova M,, Mikhalenko V,et al. High-resolution provenance of desert dust deposited on Mt. Elbrus, Caucasus in 2009–2012 using snow pit and firn core records[J]. Cryosphere,2013-01-01,7(5)