DOI: 10.1016/j.atmosenv.2014.03.031
Scopus记录号: 2-s2.0-84897049180
论文题名: Dust and associated geochemical fluxes in a firn core from coastal East Antarctica and its linkages with Southern Hemisphere climate variability over the last 50 years
作者: Laluraj C ; M ; , Thamban M ; , Satheesan K
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 90 起始页码: 23
结束页码: 32
语种: 英语
英文关键词: Coastal east antarctica
; Dust fluxes
; SAM
; Trace metal fluxes
Scopus关键词: Climatology
; Copper
; Deposition
; Environmental impact
; Geochemistry
; Dust flux
; East antarctica
; Positive correlations
; SAM
; Southern Annular Mode
; Surface air temperatures
; Trace metal
; Trace metal deposition
; Dust
; barium ion
; chromium
; cuprous ion
; oxygen 18
; zinc
; air temperature
; barium
; chromium
; climate change
; coastal zone
; copper
; dust
; easterly wave
; environmental impact
; firn
; ice core
; moisture content
; Southern Hemisphere
; westerly
; air temperature
; Antarctica
; article
; climate change
; dust
; moisture
; priority journal
; Southern Hemisphere
; wind
; winter
; Antarctica
; East Antarctica
; Queen Maud Land
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: High-resolution records of dust and trace element fluxes were studied in a firn core from the coastal Dronning Maud Land, representing the past 50 years, to understand the influence of recent climate variability on the transportation and accumulation of these components in East Antarctica. A doubling of dust flux was observed since 1985, coinciding with a shift in the Southern Annular Mode (SAM) index to more positive values. Strong positive correlation (r=0.68; p<10-8) observed between dust flux and the SAM suggests that the positive values of the SAM index are likely to be responsible for the recent increase in dust deposition over East Antarctica, through strengthening of westerly winds. NCEP/NCAR reanalysis data reveals that the polar easterlies consistently strengthened since 1985 at the study region, leading to the sinking of dust materials brought by the stronger westerlies. Significant inverse correlation (r=-0.42, p<0.00004) between the dust flux and δ18O records (proxy for surface air temperature) further suggests that enhancement of the dust flux is taking place during winter periods, possibly due to the reduced moisture content and increased wind intensity. Interestingly, the timing and amplitude of the insoluble dust flux matched remarkably well with the trace metal fluxes of Ba, Cr, Cu, and Zn, confirming that dust was the main carrier of airborne geochemical tracers to East Antarctica in the recent past. The observed doubling of dust and associated trace metal deposition in East Antarctica have wide-ranging implications for understanding the factors driving the inter-continental transportation of impurities and their environmental impact on Antarctica. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81155
Appears in Collections: 气候变化事实与影响
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作者单位: National Centre for Antarctic and Ocean Research, Headland Sada, Goa 403804, India
Recommended Citation:
Laluraj C,M,, Thamban M,et al. Dust and associated geochemical fluxes in a firn core from coastal East Antarctica and its linkages with Southern Hemisphere climate variability over the last 50 years[J]. Atmospheric Environment,2014-01-01,90