Vertical distribution of sedimentary organic carbon in the Yap Trench and its implications
WU Bin1,2, LI Dong1,2, ZHAO Jun1,2, LIU Cheng-gang1,2, SUN Cheng-jun3, CHEN Jian-fang1,2, PAN Jian-ming1,2, HAN Zheng-Bing1,2, HU Ji1,2
1. Laboratory of Marine Ecosystem and Environment, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;
2. Key laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China;
3. Marine Ecology Center, First Institute of Oceanography, State Oceanic Administration, Qingdao 266237, China
Sediment core from the Yap Trench located in the west Pacific Ocean was collected by manned deep-sea research submersible Jiaolong. Geochemical parameter analyses (e.g. total organic carbon (TOC), δ13C, grain size composition and specific surface area (SSA)), combined with an end-member mixing model, a degradation model and principal component analysis (PCA) were conducted in order to 1) study the vertical distribution of the organic carbon (OC) and corresponding affecting factors, 2) assess the degradation and accumulation rate and the flux of the sedimentary OC in the Yap Trench. The mean TOC content of the Yap Trench was (0.31%±0.10%) and was comparable with those of the neritic sediments. Probably due to enrichment of the allochthonous organic matter in the large grain-sized particles (e.g. silt) and intense decomposition of OC by microorganisms, the TOC content was positively related with silt% and negatively related with SSA and clay%. The microorganism-derived OC was the dominant proportion of the sedimentary TOC (52%±21%), followed by the marine (37%±19%) and terrestrial (11%±4%) OC. The OC contents of those three sources all decreased downward. Based on PCA, decoupling between the microorganism-derived and the allochthonous OC indicated that the OC delivered by the submarine groundwater was probably an important nutritional supply for the microorganisms in the trench. The degradation rate of the refractory OC which dominated the vertical profile of TOC was around 0.0012a-1, slightly higher than that of the normal deep ocean but lower than the neritic environment. The accumulation rate and settling flux of TOC in the Yap Trench were around 1.8×10-5gC/(cm2·a) and 2.2×109gC/a.
吴彬, 李栋, 赵军, 刘诚刚, 孙承君, 陈建芳, 潘建明, 韩正兵, 胡佶. 雅浦海沟沉积有机碳垂向分布及其指示意义[J]. 中国环境科学, 2018, 38(9): 3502-3511.
WU Bin, LI Dong, ZHAO Jun, LIU Cheng-gang, SUN Cheng-jun, CHEN Jian-fang, PAN Jian-ming, HAN Zheng-Bing, HU Ji. Vertical distribution of sedimentary organic carbon in the Yap Trench and its implications. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3502-3511.
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