کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5745999 1618788 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dissolved rare earth elements in the central-western sector of the Ross Sea, Southern Ocean: Geochemical tracing of seawater masses
ترجمه فارسی عنوان
عناصر خاکی کمیاب حل شده در بخش مرکزی غربی دریای راس، اقیانوس جنوبی: ردیابی ژئوشیمیایی توده های دریایی
کلمات کلیدی
عناصر نادر زمین دریای راس، اقیانوس جنوبی، گردش خون در اقیانوس،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- Rare earth element composition as fingerprint of new formation water masses is proposed.
- REEs pattern coming from catchment area and hydrothermal activity of western Ross Sea.
- Tb and Nd peaks are recognized as particular fingerprint of HSSW waters.

The present essay contributes to the existing literature on rare earth elements (REEs) in the southern hemisphere by presenting the first data, to our knowledge, on the vertical profiles of dissolved REEs in 71 samples collected in the central-western sector of the Ross Sea (Southern Ocean-SO). The REEs were measured in the water samples collected during the 2002-2003 and 2005-2006 austral summers. 4 samples were collected and analysed in the framework of a test experiment, as part of the WISSARD Project (Whillans Ice Stream Subglacial Access Research Drilling). Our results show significant differences between the REE patterns of the main water masses present in the SO: we could observe specific signature in the High Salinity Shelf Water (HSSW), Ice Shelf Water (ISW) and Low Salinity Shelf Water (LSSW). A significant increase in Terbium (Tb) concentration was observed in the HSSW and ISW, the two principal water masses contributing to the formation of Antarctic Bottom Water (AABW) in the Ross Sea area, and in LSSW. Some of the HSSW samples show enrichment in Neodymium (Nd). Dissolved REE could therefore be used as tracers to understand the deep circulation of the SO (Pacific sector).We hypothesize that: (I) the characteristic dissolved REE pattern may derive from the composition of source area and from the hydrothermal activity of the central-western area of the Ross Sea; (II) the Tb anomaly observed in the AABW on the South Australian platform could be partially explained by the contribution of AABW generated in the Ross Sea region.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 183, September 2017, Pages 444-453
نویسندگان
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