Zonal patterns of δ13C, δ15N and 210Po in the tropical and subtropical North Pacific
Zonal patterns of δ13C, δ15N and 210Po in the tropical and subtropical North Pacific
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DOI：
10.1029/2005gl025186
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发表时间：
2006-02
影响因子：
5.2
通讯作者：
Min Chen;Laodong Guo;Qiang Ma;Y. Qiu;Run Zhang;E. Lv;Yipu Huang
中科院分区：
文献类型：
--
作者：
Min Chen;Laodong Guo;Qiang Ma;Y. Qiu;Run Zhang;E. Lv;Yipu Huang
固氮过程可以为地表沃茨提供大量的生物有效氮，增加海洋对大气CO2的固存，改变地球化学参数的分布。本文报道了一条穿越亚热带和热带北太平洋的样带上颗粒有机质（POM）的δ 15 N和δ 13 C以及颗粒210 Po与溶解态210 Po的比值的纬向分布。15N和210Po信号均表明西北副热带北太平洋的N2固定增强。沿着样带的N2固定量向东逐渐减少，证实了风成Fe和P在控制海洋N2固定中的作用。与15N和210Po的纬向变化相关联，悬浮态POM的δ13C向东逐渐增加，反映了研究区表层海水人为CO2浓度自西向东逐渐降低的趋势。我们的研究结果强调，需要更密切地研究可能的纵向变化的机制，在海洋中的N2固定和风成铁和P在控制海洋N2固定和人为CO2的作用。
Nitrogen fixation process may supply a significant fraction of bioavailable nitrogen to surface waters, increase the oceanic sequestration of atmospheric CO2, and alter the distribution of geochemical parameters. We report a zonal pattern of δ15N and δ13C in particulate organic matter (POM), and ratios of particulate 210Po to dissolved 210Po along a transect through the subtropical and tropical North Pacific. Both 15N and 210Po signals indicated an enhanced N2 fixation in the northwestern subtropical North Pacific. The eastward decrease of N2 fixation along this transect testified the role of aeolian Fe and P in controlling marine N2 fixation. Associated with the zonal variations of 15N and 210Po, the δ13C of suspended POM increased eastward, reflecting the decrease of anthropogenic CO2 concentration in surface seawater from west to east in the study area. Our results highlight the need to examine more closely the mechanisms of possible longitudinal variation in N2 fixation in the ocean and the role of aeolian Fe and P in controlling marine N2 fixation and anthropogenic CO2.