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

北太平洋亚北极环流物质输送对应的沉降粒子通量的年变化

基本信息

批准号：
15310001
负责人：
YANADA Mitsuru
金额：
$ 9.86万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15310001/
关键词：
Sediment Trap Annual Variation Sinking Particles Alaskan Stream North Pacific Bering Sea Calcium Carbonate Biogenic Opal 生物起源炭酸カルシウム

项目摘要

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.

本研究的目的是通过阐明海洋水文环境因子，如海洋水文环境因子，预测未来海洋环境的变化。G. 2003 - 2007年，日本北海道大学的“奥肖罗丸”号船在白令海海盆（AB：53.北纬5度，177度。0°W）和亚北极太平洋中部（SA：49.北纬174度。对部分沉降颗粒进行了总质量、总碳、有机碳、总氮、总氨基酸、氨基己糖、生物蛋白石、碳酸钙和稳定同位素的测定。沉降颗粒的其他部分也使用显微镜进行了观察，以分析硅藻、放射虫、硅藻和有孔虫。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、盐和体积输送，分析了白令海海盆2003年春季的水文环境变化，结果表明：白令海海盆2003年春季存在一个高的沉降颗粒通量峰值，硅藻的贡献相对较大。在副北极太平洋中部，由球石和有孔虫组成的沉降颗粒的最大峰值通量也存在时滞。这些结果使我们预期在2003-2007年期间的沉降颗粒物的特征会出现一些异常，这意味着在2003-2007年期间，AB站和SA站的海洋生物的沉降过程或生产都出现了异常。沉降粒子通量和沉降特性的变化可能与地表温度条件的变化有关。