کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1261731 | 1496703 | 2010 | 12 صفحه PDF | دانلود رایگان |
Dissolved carbon tetrachloride (CCl4) was measured for the first time in the East Sea (Sea of Japan) during the summer of 1999. Fairly high concentrations (> 0.5 pmol kg−1 at the minimum) of CCl4 were observed throughout the water column to the bottom (> 3500 m), with evidence of significant depletion of this compound in the well-oxygenated thermocline waters. CCl4 loss rates below 200 m depth were estimated to range from near zero to 0.05 yr−1 using a tracer-calibrated mixing model, and from 0.04 to 0.07 yr−1 using the CFC-12 partial pressure (pCFC-12) age technique. The results from the mixing model and pCFC-12 age technique are in fairly good agreement in the upper 1500 m of water column, but show systematic differences in the deep waters below 1500 m that are likely due to biases in the pCFC-12 age technique. Despite relatively rapid removal in the upper 500 m water column, the low removal rates for CCl4 in the cold, deep waters of the East Sea estimated using the mixing model (< 0.02 yr−1 for depths > 2000 m) indicate that this compound can be a potentially useful quantitative ocean tracer in certain regions.
Journal: Marine Chemistry - Volume 121, Issues 1–4, 20 August 2010, Pages 100–111