CAJ | 학술논문

通过对比白令海BR07孔与B5-4孔硅藻百分含量、颜色反射率等参数结果，综合建立了BR07孔年龄框架。根据该重建年龄结果，BR07孔年龄约为11.3～1.9 ka ，平均沉积速率约为28.5 cm/ka ，略低于B5-4孔。基于圆柱拟脆杆藻与塞米新细齿藻比值 Fragilariopsis cylindrus含量/（Fragilari-opsis cylindrus含量＋ Neodenticula seminae含量）重建的近万年来白令海海冰变化历史，记录到该区域末次冰消期以来包括新仙女木事件在内的3次冷事件以及1次暖事件，其中新仙女木事件约发生于距今11.3～10.7 ka ，与格陵兰冰心记录对应值距今12.9～11.6 ka基本相近，这进一步佐证了该重建年龄比原始的全样有机碳 AMS 14 C测年结果更可信。
통과대비백령해BR07공여B5-4공규조백분함량、안색반사솔등삼수결과，종합건립료BR07공년령광가。근거해중건년령결과，BR07공년령약위11.3～1.9 ka ，평균침적속솔약위28.5 cm/ka ，략저우B5-4공。기우원주의취간조여새미신세치조비치 Fragilariopsis cylindrus함량/（Fragilari-opsis cylindrus함량＋ Neodenticula seminae함량）중건적근만년래백령해해빙변화역사，기록도해구역말차빙소기이래포괄신선녀목사건재내적3차랭사건이급1차난사건，기중신선녀목사건약발생우거금11.3～10.7 ka ，여격릉란빙심기록대응치거금12.9～11.6 ka기본상근，저진일보좌증료해중건년령비원시적전양유궤탄 AMS 14 C측년결과경가신。
T he age model of Core BR07 is reconstructed based on the comparisons of diatom distributions and color parameters of the sediments between Cores B 5-4 and BR07 ,both collected from the northern continental slope of the Bering Sea .According to this age model ,the deposition ages of Core BR07 range from 1.9 to 11.3 kaBP ,with an average sedimentation rate of 28.5 cm/ka which is slightly lower than that of Core B5-4 .A sea-ice proxy ,de-fined as the ratio of Fragilariopsis cylindrus content to (F .cylindrus content+ Neodenticula seminae content) ,is proposed to reconstruct the historic climate record of sea-ice changes over the last 10 ka .Three cold events (inclu-ding the Younger Dryas cold event ) as well as one warm event since the last deglacial period have been detected in the core .T he reconstructed time span of the Younger Dryas cold event in Core BR 07 is 11.3~10.7 ka BP ,close to its correspondent of 12.9~11.6 ka BP from Greenland ice cores ,further confirming that it is more reliable than the age generated from the radiocarbon dating of the bulk sediment organic carbon .