Sea-spray deposition in Antarctic coastal and plateau areas from ITASE traverses

被引:56
|
作者
Benassai, Silvia
Becagli, Silvia
Gragnani, Roberto
Magand, Olivier
Proposito, Marco
Fattori, Ilaria
Traversi, Rita
Udisti, Roberto
机构
[1] Univ Florence, Dept Chem, I-50019 Florence, Italy
[2] ENEA, Ctr Ric Casaccia, I-00100 Rome, Italy
[3] Univ Grenoble 1, CNRS, Lab Glaciol & Geophys Environm, F-38402 St Martin Dheres, France
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关键词
D O I
10.3189/172756405781813285
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Sea-salt markers (Na+, Mg2+ and Cl-) were analyzed in recent snow collected at more than 600 sites located in coastal and central areas of East Antarctica (northern Victoria Land-Dome C-Wilkes Land), in order to understand the effect of site remoteness, transport efficiency and depositional and post-depositional processes on the spatial distribution of the primary marine aerosol. Firn-core, snow-pit and 1 m integrated superficial snow samples were collected in the framework of the international Trans-Antarctic Scientific Expeditions (ITASE) project during recent Italian Antarctic Campaigns (1992-2002). The sampling sites were mainly distributed along coast-inland traverses (northern Victoria Land-Dome C) and an east-west transect following the 2100 m contour line (Wilkes Land). At each site, the snow ionic composition was determined. Here, we discuss the distribution of sea-spray components (Na+, Mg2+ and Cl-)as a function of distance from the sea, altitude and accumulation rate, in order to discover the pulling-down rate, possible fractionating phenomena and alternative sources moving inland from coastal areas. Sea-spray depositional fluxes decrease as a function of distance from the sea and altitude. A two-order-of-magnitude decrease occurs in the first 200 km from the sea, corresponding to about 2000 m a.s.l. Correlations of Mg2+ and Cl- with Na+ and trends of Mg2+/Na+ and Cl-/Na+ ratios showed that chloride has other sources than sea spray (HCl) and is affected by post-depositional processes. Accumulation rate higher than 80 kg m(-2) a(-1) preserves the chloride record in the snow. Sea-spray atmospheric scavenging is dominated by wet deposition in coastal and inland sites.
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页码:32 / 40
页数:9
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