Size‐fractionated iron distributions and iron‐limitation processes in the subarctic NW Pacific
Size‐fractionated iron distributions and iron‐limitation processes in the subarctic NW Pacific
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DOI：
10.1029/2002gl016853
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发表时间：
2003-07
影响因子：
5.2
通讯作者：
J. Nishioka;S. Takeda;I. Kudo;D. Tsumune;T. Yoshimura;K. Kuma;A. Tsuda
中科院分区：
文献类型：
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作者：
J. Nishioka;S. Takeda;I. Kudo;D. Tsumune;T. Yoshimura;K. Kuma;A. Tsuda
对北太平洋亚北极西部和东部的粒度分选铁垂直剖面的比较清楚地表明，西部地区的易动颗粒铁浓度较高，这一结果有力地支持了西部地区铁供应较高的观点。此外，SEEDS实验是北太平洋亚北极地区的第一个中尺度铁富集实验，其结果清楚地表明，在浮游植物生长过程中，溶解部分（主要是胶体部分）中的人工富集铁迅速转化为悬浮的易动颗粒铁，并保留在表层混合层中。可能，这种快速转变过程是在零星的大气铁供应后自然发生的，而西部地区的不稳定颗粒铁被保留下来。此外，这种转化过程降低了铁的溶解浓度及其生物利用度。因此，这一转化过程对于了解北太平洋亚北极西部浮游植物的铁限化过程和生物地球化学铁循环具有重要意义。
Comparison of vertical profiles of size‐fractionated iron between the western and eastern subarctic North Pacific clearly showed higher labile particulate iron concentrations towards the west and this result strongly supports the higher iron supply in the western region. Additionally, the results of the SEEDS experiment, the first meso‐scale iron enrichment experiment in the subarctic North Pacific, clearly showed that artificially enriched iron in the dissolved fraction (mainly in colloidal fraction) was rapidly transformed to suspended labile particulate iron during phytoplankton growth and was retained in the surface mixed layer. Probably, this same rapid transformation process occurs naturally after sporadic atmospheric iron supply and the labile particulate iron is retained in the western region. Furthermore, this transformation process reduces dissolved concentration of iron and its bioavailability. Therefore, the transformation process is important for understanding how phytoplankton became iron limited and the biogeochemical iron cycle in the western subarctic North Pacific.