The particle fluxes in sediment traps from Niulang Guyot area in the Northwest Pacific Ocean  

作　　者：Xiuwu Sun Jinmin Chen Baohong Chen Cai Lin Yang Liu Jiang Huang Zhong Pan Kaiwen Zhou Qing He Fangfang Kuang Hui Lin 

机构地区：[1]Laboratory of Marine Ecological and Environment Early Warning and Monitoring,Third Institute of Oceanography,Ministryof Natural Resources,Xiamen 361005,China [2]Ocean Dynamics Laboratory,Third Institute of Oceanography,Ministry of Natural Resources,Xiamen 361005,China

出　　处：《Acta Oceanologica Sinica》2022年第11期34-44,共11页海洋学报（英文版）

基　　金：The Global Change and Air-sea Interaction II Project under contract Nos GASI-04-HYST-01 and GASI-01-NPACSTsum;the Eastern Pacific Eco-environment Monitoring and Protection Project under contract No.DY135-E2-5-02;the Fund of COMRA-45 Cruise under contract No.DY-HC-135-45;the Scientific Research Foundation of Third Institute of Oceanography,Ministry of Natural Resources of the People’s Republic of China under contract No.2017014。

摘　　要：The flux of settling particles in the ocean has been widely explored since 1980s due to its important role in biogenic elements cycling,especially in the transport of particulate organic carbon(POC)in the deep sea.However,research in the seamount area of the oligotrophic subtropical Northwest Pacific Ocean is lacking.In this work,two sediment traps were deployed at the foot and another two at the hillside of Niulang Guyot from August2017 to July 2018.The magnitude and composition of particle fluxes were measured.The main factors influencing the spatial variations of the fluxes were evaluated.Our results indicated a low particulate flux from Niulang Guyot area in the Northwest Pacific Ocean,reflecting low primary productivity of the oligotrophic ocean.The total mass flux(TMF)decreased from 2.57 g/(m^(2)·a)to 0.56 g/(m^(2)·a)with increasing depth from 600 m to 4850 m.A clear seasonal pattern of TMF was observed,with higher flux in summer than that in winter.The peak flux of 26.52 mg/(m^(2)·d)occurred in August at 600 m,while the lowest value of 0.07 mg/(m^(2)·d)was shown in February at 4850 m.The settling particles at the deep layers had similar biochemical composition,with calcium carbonate(CaCO_(3))accounting for up to 90%,followed by organic matter and opal,characteristics of Carbonate Ocean.The POC flux decreased more rapidly in the twilight layer because of faster decomposition,remineralization,and higher temperature.A small fraction of POC was transported into the deep ocean by biological pump.Particle fluxes were mainly controlled by the calcareous ballasts besides the primary productivity of the surface water.The advection may be another important factor affecting the flux in the seamount area.The combination of settled matters rich in foraminiferal tests with topography and currents may be the reason for regulating the local abundance of benthos on seamounts.Our results will fill in the knowledge gap of sedimentation flux,improve the understanding of ecosystem in Niulang Guyot area,and eventually provi

关 键 词：sediment trap FLUX SEAMOUNT POC Northwest Pacific Ocean 

分 类 号：P736.21[天文地球—海洋地质]