Abstract:

Earth’s oceans hold a vast quantity of dissolved organic carbon (DOC) that cycles in disparate rates. A small fraction of this carbon is bioreactive and rapidly exchanges with atmospheric CO₂ through biological production and respiration, whereas the remaining seems refractory and persists in the ocean for centuries to millennia. Predicting ocean carbon cycle feedbacks to climate has been hampered by a number of uncertainties related to both the reactive and refractory DOC pools. Chief among these uncertainties is an understanding of the response of the two DOC pools to changing ocean conditions (e.g., PP, nutrient, light, ocean circulation, etc.). In this talk, I will present two lines of our work forged to better understand carbon cycle in a changing ocean, including a development of molecular indicators that allows broad-scale characterization of reactive DOC pool under varying oceanic conditions and a series of laboratory observations that help solve an enduring mystery of the refractory DOC pool.

Bio:

沈渊，2009年获厦门大学学士学位，2011年、2017 年获美国南卡罗莱纳大学硕士、博士学位（导师Prof. Ronald Benner），2017-2020 年在加州大学圣克鲁兹分校从事博士后研究，2020年入职厦门大学海洋与地球学院南强青年拔尖B类人才副教授职位。沈渊博士长期开展海洋有机质的生物地球化学循环研究，通过分析有机质化学组分探究其来源、生物活性以及对海洋生态系统变化的响应，研究区域覆盖开阔大洋、北冰洋、南大洋、近岸海域、河流以及地下水。博士后阶段通过分析深海蛋白珊瑚内氨基酸单体C N同位素，揭示海洋表层营养盐及生态系统的演变历史。目前已在多个国际知名学术期刊发表论文近20篇，论文被引累计550次，同时担任十余个国际学术期刊审稿人，审稿60余次。2017年获南卡罗莱纳大学授予的“突破性研究学者”奖，2018年受邀参加久负盛名的夏威夷DISCO学术研讨会（Dissertations Symposium in Chemical Oceanography; invitation only）。