CAJ | 학술논문

通过白令海盆08BR02钻孔（57°0．06′N，174°29．97′E，水深3805 m）的AMS 14C测年数据、颜色反射率b*与NGRIP（North Greenland Ice Core Project）氧同位素曲线及白令海4个钻孔颜色反射率b*记录作对比，建立该孔的地层年代框架，顶、底部沉积物年龄分别为4．2 ka和17．0 ka。该孔自17 ka以来，IRD （ice-rafted detritus：冰筏碎屑）、粒度的砂组分以及敏感组分中的33-63μm组分百分含量在全球性冷事件H1（Heinrich event 1）、B/A （Blling/Allerd）中期和YD （Younger Dryas）期间明显增加。IRD和有孔虫丰度在H1、B/A和YD期间同步增加，可能反映海冰融化为表层水提供营养物质，促使表层钙质生产力勃发并将有机质进一步输送至海底，为底栖生物提供营养物质。
통과백령해분08BR02찬공（57°0．06′N，174°29．97′E，수심3805 m）적AMS 14C측년수거、안색반사솔b*여NGRIP（North Greenland Ice Core Project）양동위소곡선급백령해4개찬공안색반사솔b*기록작대비，건립해공적지층년대광가，정、저부침적물년령분별위4．2 ka화17．0 ka。해공자17 ka이래，IRD （ice-rafted detritus：빙벌쇄설）、립도적사조분이급민감조분중적33-63μm조분백분함량재전구성랭사건H1（Heinrich event 1）、B/A （Blling/Allerd）중기화YD （Younger Dryas）기간명현증가。IRD화유공충봉도재H1、B/A화YD기간동보증가，가능반영해빙융화위표층수제공영양물질，촉사표층개질생산력발발병장유궤질진일보수송지해저，위저서생물제공영양물질。
Investigations of the terrigenous and biogenic fractions have been performed on core 08BR02,which was col-lected from the Bering Basin,North Pacific Ocean,during the third Chinese National Arctic Expedition.The depth-age model for this core is based on age control points from AMS 14 C dating of organic carbon and planktonic foraminifera,and correlation of the color b*in this core with the NGRIPδ18 O curve and color b*of four sediment cores in the North Pacific Ocean and the Bering Sea.The sea ice extension history in the Bering Basin over the last 17 ka is reconstructed from the ice-rafted detritus (IRD),the sand component and the sensitive grain size compo-nent (33-63 μm in size),which were carried by sea ice and icebergs,and increased during the H1 ,mid-B/A and YD periods.The IRD and the foraminiferal abundance in core 08BR02 increased simultaneously during the H1 ,mid-B/A and YD periods,indicating that input of meltwater enhanced the surface water nutrients,which then promoted blooms of planktonic foraminifera.The surface organic material that was deposited on the sea bottom pro-vided nutrients for benthic foraminifera.