Biogeochemistry of iron in the Arabian Sea
Biogeochemistry of iron in the Arabian Sea
复制标题
阿拉伯海铁的生物地球化学
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Naqvi
中科院分区：
文献类型：
--
作者：
J. Moffett;J. Vedamati;T. Goepfert;A. Pratihary;M. Gauns;S. Naqvi
阿拉伯海是一个多产盆地，季节性上升流和对流混合导致表层营养物浓度高，藻类大量繁殖。控制阿拉伯海初级生产力的因素令人感兴趣，因为该区域包含一个强氧最小区（OMZ），这是海洋中硝酸盐的主要汇。2007年进行了铁（Fe）分布和氧化还原化学调查，以评估其在阿拉伯海海洋地球化学中的作用，包括调查生物对Fe添加物的反应。结果表明，Fe强烈富集在阿拉伯海东部，与OMZ。OMZ内的大部分Fe以Fe（II）形式存在，这增加了Fe的停留时间和积累。相比之下，阿拉伯海西部的铁浓度较低，与富铁OMZ由水团边界隔开。因此，低表面值与阿曼海岸季风驱动的上升流有关。孵化显示，在西南季风的初级生产力强烈限制铁在大部分的研究领域。培养的表面沃茨与铁导致快速增长的棕囊藻和叶绿素增加了六倍。这是阿拉伯海铁限制的第一次演示，也是整个盆地溶解铁和铁（II）的第一次高分辨率分区调查。我们的研究结果表明，开发的模型来预测阿拉伯海地球化学对全球变暖的响应需要考虑对Fe输入的影响。
The Arabian Sea is a productive basin where seasonal upwelling and convective mixing result in high surface nutrient concentrations and widespread algal blooms. The factors controlling primary productivity in the Arabian Sea are of interest because the region contains an intense oxygen minimum zone (OMZ) that is a major sink for nitrate in the ocean. A survey of iron (Fe) distribution and redox chemistry was carried out in 2007 to assess its role in Arabian Sea biogeochemistry, including an investigation of the biological response to Fe additions. Results show that Fe is strongly enriched in the eastern Arabian Sea, associated with the OMZ. Much of the Fe within the OMZ is present as Fe(II), which enhances the residence time and accumulation of Fe. In contrast, Fe concentrations are lower in the western Arabian Sea, separated from the Fe‐rich OMZ by a water mass boundary. Consequently, low surface values are associated with monsoon‐driven upwelling off the Omani coast. Incubations revealed that primary production during the southwest monsoon was strongly limited by Fe over much of the study area. Incubation of surface waters with Fe resulted in rapid growth of Phaeocystis and up to sixfold increase in chlorophyll. This is the first demonstration of Fe limitation in the Arabian Sea, and the first high resolution zonal survey of dissolved Fe and Fe(II) across the basin. Our findings suggest that models developed to predict the response of the Arabian Sea biogeochemistry to global warming need to consider effects on Fe inputs.