کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9485103 | 1627981 | 2005 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The biogeochemistry of Arabian Sea surficial sediments: A review of recent studies
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The biogeochemistry of Arabian Sea surficial sediments: A review of recent studies The biogeochemistry of Arabian Sea surficial sediments: A review of recent studies](/preview/png/9485103.png)
چکیده انگلیسی
The Arabian Sea's unusual features have drawn attention from oceanographers and other scientists since the late 1800s. Water-column processes, including the seasonally reversing monsoon-driven circulation and the associated upwelling and productivity, as well as a basin-wide, mid-water layer of intense oxygen depletion have been the foci of many studies. However, the importance of benthic processes in the Arabian Sea has also been recognized. Both the abyssal region and the continental margins have been sites of major studies focused on the biology and geochemistry of surficial sediments and key biogeochemical processes that occur across the benthic boundary layer, especially in the last decade. A summary of benthic studies carried out up to the 1990s is followed by descriptions and syntheses of biological and geochemical studies conducted since that time. The results highlight that the benthic system of the Arabian Sea is highly dynamic, with evidence of strong benthic-pelagic coupling displayed as a cross-basin trophic gradient and in benthic response to seasonal variability in productivity and C flux. Benthic biogeochemical processes, especially on the upper slope and within the oxygen minimum zone, including denitrification, phosphogenesis, and fluxes of trace metals, nutrients and dissolved organic matter, may be of global significance but remain poorly quantified. Sedimentary organic matter distributions across the Arabian Sea have served to fuel an ongoing debate over the controlling environmental factors. Recent studies have illustrated that factors including the supply of reactive organic matter, oxygen exposure, digestion and mixing by the benthos, sorptive preservation, and sediment dilution, winnowing and down-slope transport, all interact in a complex fashion and with varied impact to determine distributions of sedimentary organic matter across the different margins of this basin. Notable features include the facts that it is only at the core of the oxygen minimum zone on the Indian and Pakistan margins where laminated sediments occur and oxygen concentrations appear to fall below the threshold required for macrobenthos, and that sulfate reduction is surprisingly suppressed when compared to rates observed on other upwelling margins with oxygen minimum zones. The review is completed by suggestions for future benthic research in the Arabian Sea.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Oceanography - Volume 65, Issues 2â4, MayâJune 2005, Pages 260-289
Journal: Progress in Oceanography - Volume 65, Issues 2â4, MayâJune 2005, Pages 260-289
نویسندگان
Greg Cowie,