Studies of Nitrogen and Carbon Biogeochemistry during SOFex

美国马萨诸塞大学达特茅斯分校的研究人员将于2001-2002年夏季参加南大洋（SOFeX）的大型考察，研究铁对水柱中尺度施肥的影响。具体而言，这些研究人员将研究稳定氮和碳同位素循环对铁施肥的响应。他们的目标是利用这些同位素作为示踪剂，首先确定氮同位素分异的大小和机制，以响应偶发的铁输入，从而预测将产生什么样的古海洋学信号（并保存在下面的沉积物中）。其次，他们将评估在这些开放水域中尺度扰动实验中使用氮和碳的稳定同位素作为氮和碳转移的原位瞬态示踪剂的可行性。

ABSTRACTOCE-9986061Researchers at the University of Massachusetts at Dartmouth will participate in an larger expedition to the Southern Ocean (SOFeX) in austral summer of 2001-2002 to study the effects of mesoscale fertilization of the water column with iron. Specifically, these investigators will study the response of stable nitrogen and carbon isotope cycling to iron fertilization. Their goal is to use these isotopes as tracers to first determine the magnitude and mechanisms of nitrogen isotopic fractionation in response to an episodic iron input and thus to predict what kind of paleoceanographic signal would be generated (and preserved in the underlying sediments). Secondly, they will assess the feasibility of using stable isotopes of nitrogen and carbon as in situ transient tracers of nitrogen and carbon transfers in these open-water mesoscale perturbation experiments.