海洋科学学术讲座第113期(2019年第4期):Convergent Estimates of Marine Nitrogen Fixation

Convergent Estimates of Marine Nitrogen Fixation

发布日期:2019-01-07
主题
Convergent Estimates of Marine Nitrogen Fixation
活动时间
-
活动地址
亚博2018 南校园冼为坚堂119会议室
主讲人
王为磊 博士(加州大学欧文分校)
主持人
来志刚 教授(亚博2018 )

亚博2018下载 主办,南海研究院协办

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报告简介:

Uncertainty in the global patterns of marine nitrogen fixation limits our understanding of the response of the ocean’s nitrogen and carbon cycles to environmental change. The geographical distribution and ecological controls on nitrogen fixation are difficult to constrain with limited in-situ measurements. Here we present convergent estimates of nitrogen fixation from an inverse biogeochemical and a prognostic ocean model. Our results demonstrate strong spatial variability in the nitrogen to phosphorus ratio of exported organic matter that greatly increases the global nitrogen-fixation rate. We find that new nitrogen supports up to 50% of export in subtropical gyres, that nitrogen fixation and denitrification are spatially decoupled and that current-era nitrogen sources and sinks largely balance on multidecadal timescales. Moreover, we propose a role for top-down grazing control in shaping the global patterns of nitrogen fixation. Our findings suggest higher than expected ocean carbon export and weaker stabilizing nitrogen cycle feedbacks than previously thought.

This study has been accepted by Nature as a research article.

报告人简介:

王为磊,博士毕业于纽约州立大学石溪分校,目前在加州大学欧文分校从事博士后工作。已发表论文10篇,其中第一作者文章7篇。

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