The annual variation of sinking particles flux corresponding to material transports of North Pacific Subarctic Gyre

本研究的目的是通过阐明引起亚北极太平洋中部和白令海盆地初级生产过程的季节和年度变化的水文环境因子，如阿拉斯加流，来预测未来海洋环境的变化。2003 - 2007年，北海道大学所属的T/S“Oshoro Maru”号每年在白令海盆地（AB: 53）进行时序捕沙器阵列的部署和回收。5°N, 177。0°W)和亚北极太平洋中部（南纬49度）。0°N, 174。0°W)。取所得沉粒进行总质量、总碳、有机碳、总氮、总氨基酸、己糖胺、生物蛋白石、碳酸钙和稳定同位素的测定。下沉颗粒的其他部分也用显微镜观察，用于分析硅藻、放射虫、水蛭和有孔虫。利用CTD、XCTD和Argo浮标资料计算了阿拉斯加流和亚北极流的热、盐和体积输运，阐明了水文环境的变化。结果表明，白令海盆地2003年春季沉降颗粒通量峰值较高，硅藻贡献较大。在亚北极太平洋中部，还观察到由球岩体和有孔虫组成的下沉颗粒的最大峰值通量的时间滞后。这些结果表明，2003-2007年AB站和SA站的沉降颗粒特征出现了异常，这意味着2003-2007年AB站和SA站的沉降过程或海洋生物生产都出现了异常。这些通量和沉降颗粒特性的变化可能与表面温度条件的变化有关。

The aim of this study is to predict the changes of marine environment in the future by elucidating hydrographic environmental factors, e. g. the Alaskan Stream, which cause the seasonal and annual variations in the processes of primary production in the central subarctic Pacific and the Bering Sea Basin.The deployment and recovery of time-series sediment trap array were carried out by the T/S "Oshoro Maru" belonging to Hokkaido University every year from 2003 to 2007 in the Bering Sea Basin (AB: 53. 5°N, 177. 0°W) and in the central subarctic Pacific (SA: 49. 0°N, 174. 0°W).A part of obtained sinking particles was measured for the determinations of total mass, total carbon, organic carbon, total nitrogen, total amino acids, hexosamine, biogenic opal, calcium carbonate and stable isotope. The other parts of the sinking particles were also observed using a microscope for analysis of diatoms, radiolarians, 〓ccoliths and foraminifera. The variation of hydrographic environments was elucidated by calculations of heat, salts and volume transports of the Alaskan Stream and the Subarctic Current using CTD, XCTD and Argo floats data.As a result, in the Bering Sea Basin a high maximum peak flux of sinking particles with relatively high contribution of diatoms was observed in the spring season of 2003. A time lag of the maximum peak flux of sinking particles composed of coccoliths and foraminifera was also observed in the central subarctic Pacific. These results make us expect some abnormalities on the characteristics of sinking particles during 2003-2007, implying some abnormal sinking processes or production of marine organisms in both AB station and SA station during 2003-2007. These variations for the flux and the characteristics of sinking particles may relate to the variation of surface temperature condition.