کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8953164 | 1645915 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The remineralization of sedimentary organic carbon in different sedimentary regimes of the Yellow and East China Seas
ترجمه فارسی عنوان
بازسازی کانال آلی رسوبی در رژیمهای رسوبی مختلف دریاهای زرد و شرق چین
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کلمات کلیدی
دریاهای مرزی رژیم های رسوبی، آب پا، کربن آلی رسوبی، مرطوب کننده دریاهای زرد و شرق چین،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
We investigated the remineralization of sedimentary organic carbon (SOC) at 12 sites in East China Sea mobile-muds (ECSMMs) and South Yellow Sea central mud deposits (SYSMDs) - using a time-sequence sediment incubation experiment. We examined pore-water dissolved inorganic carbon (DIC), dissolved organic carbon (DOC), fluorescent dissolved organic matter (FDOM), dissolved inorganic nitrogen (DIN) nutrients (NH4+, NO3â, and NO2â), redox sensitive elements (Fe2+ and Mn2+), and major anions (SO42â and Clâ) in incubated sediments, to better constrain controlling mechanisms of SOC remineralization under different sedimentary regimes. Lower DIC production rates in SYSMDs (2.36-3.13â¯mmolâ¯mâ2â¯dâ1) than those in ECSMMs (2.94-13.5â¯mmolâ¯mâ2â¯dâ1), were mainly attributed to cold bottom water masses and a relatively stable sedimentary environment in SYS. Higher DIC production rates were observed mostly at offshore sites of ECSMMs that had relatively enriched 13C of SOC - which indicated preferential degradation of labile SOC of marine origin. When compared with tropical mobile-muds, higher bottom-water temperatures, thicker mobile-muds, and large inputs of reactive terrestrial OC resulted in more intense remineralization of SOC in Amazon mobile-muds than in ECSMMs. Lower ratios of DOC/DIC production rates in ECSMMs (0.11-0.72) were likely indicative of efficient transformation of OC, and largely due to sulfate reduction. A rapid increase in marine protein-like FDOM components during the incubation indicated that less stable marine SOC was preferentially converted to DOC - and then to DIC. Our SOC budget indicates that 16.8% of SOC was decomposed in sediments of ECSMMs, but only about 5.4% of SOC was decomposed in SYSMDs, suggesting lower SOC preservation efficiency in mobile-muds than distal muds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Geology - Volume 495, 20 September 2018, Pages 104-117
Journal: Chemical Geology - Volume 495, 20 September 2018, Pages 104-117
نویسندگان
Bin Zhao, Peng Yao, Thomas S. Bianchi, Ana R. Arellano, Xuchen Wang, Jianbin Yang, Rongguo Su, Jinpeng Wang, Yahong Xu, Xinying Huang, Lin Chen, Jun Ye, Zhigang Yu,