کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6441494 | 1639085 | 2015 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nepheloid layer distribution in the Whittard Canyon, NE Atlantic Margin
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The dynamics and distribution of nepheloid layers in multiple branches of the Whittard Canyon were observed during three hydrographic surveys carried out between 2011 and 2013. The sources of permanent and temporal variation of the layers were investigated. Seasonal variations in primary production at the surface were reflected in the nepheloid layers extending down in the water column, particularly in the upper reaches of the canyon. Benthic nepheloid layers were observed along the canyon axes to depths greater than 2500Â m, a distance of ~Â 30Â km. Intermediate nepheloid layers were detected as lateral extensions of the benthic nepheloid layer, centred at ~Â 550Â m, 850Â m, 1150Â m and 1600Â m and stretching ~Â 20-25Â km off slope. Critical and supercritical conditions for semidiurnal tide reflection were identified coinciding with the occurrence of intermediate nepheloid layers, with other hotspots found at the boundaries of the permanent thermocline and Mediterranean Outflow Water. Weak seasonal stratification during the survey in 2012 appeared to permit storm induced mixing at deeper water depths than expected, altering the distribution of material in the nepheloid layers. The dynamic conditions of the canyon encourage nepheloid layer formation with implications ensued for deposition rates and food supply to the unique communities that are found in the Whittard Canyon and likely other similar canyon systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 367, 1 September 2015, Pages 130-142
Journal: Marine Geology - Volume 367, 1 September 2015, Pages 130-142
نویسندگان
Annette M. Wilson, Robin Raine, Christian Mohn, Martin White,