SGER: Fe limitation as a control on primary production in the Arabian Sea during the SW Monsoon

南加州大学（University of Southern California）的一名科学家受邀在西南季风期间和之后前往阿拉伯海进行巡航，这为他提供了一个独特的机会，以确定迄今为止提出的两个结论中，铁限制还是放牧，哪一个对该地区的初级生产负责。具体而言，研究人员计划验证以下三个假设：(1)生长实验将表明阿拉伯海西部的碳固定是受铁限制的；(2)碳固定受到铁和铜的限制，这反过来又限制了硅藻对铁的利用；(3)低铁北喷流的初级生产通量和碳输出通量最高，反映了陆架宽度的差异，从而反映了上升水铁含量的差异。此外，该项目还将确定季风强度和气候变化轨迹的预测变化将如何影响该地区的碳和氮循环。至于更广泛的影响，这个项目将进一步促进来自美国、印度（国家海洋学研究所、物理研究实验室）和阿曼（苏丹卡布斯大学）的科学家之间的合作。

ABSTRACTOCE-0748064An invitation to participate in a cruise to the Arabian Sea during and after the SW monsoon provides a scientist from the University of Southern California with a unique opportunity to determine which of the two conclusions put forth to date, Fe limitation or grazing, is responsible for regulating primary production in this region. Specifically, the researcher plans to test the following three hypotheses: (1) growout experiments would be used to show that carbon fixation in the western Arabian Sea is Fe-limited; (2) carbon fixation is limited by Fe and Cu, which in turn limit Fe utilization by diatoms; and (3) primary production and carbon export fluxes would be highest in the low Fe northern jets reflecting differences in shelf width and thereby the Fe content of upwelled water. Also, this project would identify how projected changes in monsoon intensity and trajectories in response to climate change would influence carbon and nitrogen cycling in this area.As regards broader impacts, this project would further a collaboration between scientists from the U.S., India (National Institute of Oceanography, Physical Research Laboratory), and Oman (Sultan Qaboos University).