CAJ | 학술논문

通过对中国第1～4次北极考察在西北冰洋采集的表层沉积物中底栖有孔虫丰度及其优势种分布特征与环境因素关系的综合研究发现，楚科奇海区低的底栖有孔虫丰度主要受较高的陆源物质输入的稀释作用影响；楚科奇海台和阿尔法脊较高的底栖有孔虫丰度主要受到暖而咸的大西洋中层水的影响；受碳酸钙溶解作用影响的门捷列夫深海平原和加拿大海盆底栖有孔虫丰度较低，并且水深3597 m的站位出现了似瓷质壳的 Pyrgo williamsoni和Quinqueloculinaorien-talis ，说明该区的CCD深度大于3600 m。根据底栖有孔虫7个优势属种的百分含量分布特征可以划分出5个区域组合：南楚科奇海陆架-白令海峡组合以优势种 Elphidium excavatum 和Buccella f rigida为特征，可能反映受白令海陆架水影响的浅水环境；阿拉斯加沿岸-波弗特海组合以优势种 Florilus scaphus和 Elphidium albiumbilicatum 为特征，可能反映受季节性海冰融化，低盐的阿拉斯加沿岸流以及河流淡水输入的低盐环境；大西洋中层水组合以优势种Cassidu-lina laev igata为特征，可能反映高温高盐的大西洋中层水影响的环境；北极深层水组合以优势种 Cibicides w uellerstor f i为特征，可能反映水深大于1500 m低温高盐的北极深层水环境；门捷列夫深海平原组合以优势种 Oridorsalis umbonatus为特征，可能反映低营养的底层水环境。
통과대중국제1～4차북겁고찰재서북빙양채집적표층침적물중저서유공충봉도급기우세충분포특정여배경인소관계적종합연구발현，초과기해구저적저서유공충봉도주요수교고적륙원물질수입적희석작용영향；초과기해태화아이법척교고적저서유공충봉도주요수도난이함적대서양중층수적영향；수탄산개용해작용영향적문첩렬부심해평원화가나대해분저서유공충봉도교저，병차수심3597 m적참위출현료사자질각적 Pyrgo williamsoni화Quinqueloculinaorien-talis ，설명해구적CCD심도대우3600 m。근거저서유공충7개우세속충적백분함량분포특정가이화분출5개구역조합：남초과기해륙가-백령해협조합이우세충 Elphidium excavatum 화Buccella f rigida위특정，가능반영수백령해륙가수영향적천수배경；아랍사가연안-파불특해조합이우세충 Florilus scaphus화 Elphidium albiumbilicatum 위특정，가능반영수계절성해빙융화，저염적아랍사가연안류이급하류담수수입적저염배경；대서양중층수조합이우세충Cassidu-lina laev igata위특정，가능반영고온고염적대서양중층수영향적배경；북겁심층수조합이우세충 Cibicides w uellerstor f i위특정，가능반영수심대우1500 m저온고염적북겁심층수배경；문첩렬부심해평원조합이우세충 Oridorsalis umbonatus위특정，가능반영저영양적저층수배경。
Benthic foraminiferal assemblages in 139 western Arctic surface sediment samples recovered during the CHINAREⅠ~ Ⅳ cruises were studied.The relative abundances of each species were calculated and according to the spatial distribution pattern of dominant species ,benthic foraminiferal assemblages were divided to determine the re-lationship between the assemblage and environmental parameters.Our results show that the spatial distribution pat-tern of low benthic foraminiferal abundance in the Chukchi shelf area is controlled by high terrigenous matter in -put.In Chukchi Plateau and Alpha ridge ,high benthic foraminiferal abundance is influenced by the warm and saline intermediate Atlantic water.In the Mendeleev Abyssal Plain and Canadian Basin ,low benthic foraminiferal abun-dance is influenced by calcium carbonate dissolution and the appearance of porcelain-like species Pyrgo williamsoni and Quinqueloculina orientalis at 3597 msites indicates the carbonate compensate depth (CCD ) is greater than 3600 m.Five assemblages related to spatial environmental factors can be determined by 7 dominant species :Southern Chukchi shelf-Bering Strait assemblage is dominantly characterized by Elphidium excavatum and Buccel-la f rigida ,representing the influence of shallow Bering Sea Shelf Water ;Alaska Coast-Beaufort Sea assemblage is dominantly characterized by Florilus scaphus-Elphidium albiumbilicatum ,indicating the low salinity environment due to seasonal sea ice melting and/or Alaska Coastal Current or riverine input ;Atlantic Intermediate Water as-semblage is dominated by Cassidulina laevigata ,representing warm saline Atlantic Intermediate Water ;Arctic Deep Water assemblage is dominated by Cibicides wuellerstor fi,reflecting the low temperature and high salinity environment greater than 1500m;Mendeleev Abyssal Plain assemblage is dominated by Oridorsalis umbonatus , showing the oligotrophic bottom water environment.