CAJ | 학술논문

对研究区内第五次北极科学考察所取的表层海水颗粒物的浓度、显微组成、有机碳、氮含量及其同位素组成进行了分析。结果表明，楚科奇海域表层海水颗粒物浓度介于0．56-4．01 mg·L-1，具有冰区边缘高于开阔水域的特点。陆架区颗粒有机质相对含量高（TOC：9．78％-20．24％；TN：0．91％-2．31％），有机碳、氮同位素值相对重（δ13 C：-23．29‰--26．33‰ PDB；δ15 N：6．14‰-7．78‰），有机质主要来源于海洋生物，含有部分陆源有机质；陆坡及北冰洋核心区的颗粒有机质含量，除SR15站外，相对低（TOC：8．06％-8．96％；TN：0．46％-0．72％），有机碳、氮同位素值轻（δ13 C：-26．93‰--27．78‰ PDB；δ15 N：4．13‰-4．84‰），颗粒物有机质以陆源为主。陆坡区SR15站表层海水颗粒物中异常高的陆源有机质（TOC：27．94％，TN：1．16％；δ13C：-27．43；δ15N：3．81）可能来自源于东西伯利亚的穿极洋流。海冰携带的颗粒物（包括冰藻）是冰区边缘表层海水颗粒物的重要来源，在陆架区海冰融化，向水体中释放了大量生物体；而陆坡区和北冰洋核心区，海冰对颗粒物的贡献以碎屑矿物和黏土矿物为主。
대연구구내제오차북겁과학고찰소취적표층해수과립물적농도、현미조성、유궤탄、담함량급기동위소조성진행료분석。결과표명，초과기해역표층해수과립물농도개우0．56-4．01 mg·L-1，구유빙구변연고우개활수역적특점。륙가구과립유궤질상대함량고（TOC：9．78％-20．24％；TN：0．91％-2．31％），유궤탄、담동위소치상대중（δ13 C：-23．29‰--26．33‰ PDB；δ15 N：6．14‰-7．78‰），유궤질주요래원우해양생물，함유부분륙원유궤질；륙파급북빙양핵심구적과립유궤질함량，제SR15참외，상대저（TOC：8．06％-8．96％；TN：0．46％-0．72％），유궤탄、담동위소치경（δ13 C：-26．93‰--27．78‰ PDB；δ15 N：4．13‰-4．84‰），과립물유궤질이륙원위주。륙파구SR15참표층해수과립물중이상고적륙원유궤질（TOC：27．94％，TN：1．16％；δ13C：-27．43；δ15N：3．81）가능래자원우동서백리아적천겁양류。해빙휴대적과립물（포괄빙조）시빙구변연표층해수과립물적중요래원，재륙가구해빙융화，향수체중석방료대량생물체；이륙파구화북빙양핵심구，해빙대과립물적공헌이쇄설광물화점토광물위주。
Suspended particle samples were collected at 1 1 stations in the shelf and slope regions of the Chukchi Sea and the central Arctic Ocean during the Fifth Chinese Arctic Research Expedition in the summer 2012.The particle concentrations,TOC,TN and the carbon and nitrogen isotopic compositions of the samples were analyzed.The concentration of suspended particles is between 0.56 mg·L-1 and 4.01 mg·L-1 ,with the samples collected from the edge area of the sea ice having higher concentrations.The content of organic matter is higher in the shelf area (TOC:9.78%-20.24%;TN:0.91%-2.31%),and with heavier isotopic compositions (δ13C:-23.29‰--26.33‰;δ15 N:6.14‰-7.78‰),indicating that the organic matter is mostly marine with some terrigenous input in this area.In the slope and the central Arctic Ocean,the organic matter content is lower (TOC:8.06%-8.96%;TN:0.46%-0.72%),except for sample SR15,and with lighter isotopic compositions (δ13C:-26.93‰--27.78‰;δ15 N:4.13‰-4.84‰),indicating that the organic matter is mostly terrigenously de-rived in these regions.The extremely high amount of terrigenous organic matter (TOC:27.94%,TN:1.16%;δ13C:-27.43‰;δ15 N:3.81‰)implies that it has been carried by transpolar currents from the East Siberian Sea.The materials,including sea-ice algae,carried by sea ice are the primary source for particles in the edge area of the sea ice.The melting of sea ice released a substantial amount of biomass on the shelf,but a large amount of detrital and clay minerals on the slope and in the central Arctic Ocean.