Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region
Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region
复制标题
DOI：
10.1029/2007gl032188
复制
发表时间：
2008-01
影响因子：
5.2
通讯作者：
Y. Watanabe;M. Shigemitsu;K. Tadokoro
中科院分区：
文献类型：
--
作者：
Y. Watanabe;M. Shigemitsu;K. Tadokoro
利用北太平洋副极地地区4个15年水文时间序列的海洋地球化学特征，我们发现，由于海面分层，这些属性在这一地区的线性趋势。尽管东西两侧的位相相反，但也发现了18年的年代际周期。尽管随着PO 4的增加，DO呈下降趋势，但地下水中的N* 呈0.18 μmol kg−1 y−1的增加趋势。地表水中的N* 也随着Si/N的降低而增加0.12 μmol kg−1 y−1。考虑到在缺铁条件下硅藻中N/P的下降和Si/N的增加，这一发现证明，尽管是一个相对较高的初级生产区，但由于来自深水的铁的耗尽，分层的进展，浮游植物已经发生了转移。
Using four pentadecadal hydrographic time series of biogeochemical properties over the North Pacific subpolar region, we found that the linear trends of these properties over this region due to sea surface stratification. Decadal periodicity of 18 years was also found although there were the opposite phases between the eastern and western sides. Despite decreasing trends of DO with an increase of PO4, N* in the subsurface water showed an increasing trend of 0.18 μmol kg−1 y−1. N* in the surface water had also an increase of 0.12 μmol kg−1 y−1 with a decrease of Si/N. With considering the decease of N/P and increase of Si/N in diatoms under iron‐deficient conditions, this finding is evidence that a shift of phytoplankton has already occurred due to the progress in stratification with the depletion of iron derived from deep water, despite being a relatively high primary production region.