海洋碳循环新视角——海洋溶解有机物反应连续体,Environmental Science & Technology

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海洋碳循环新视角——海洋溶解有机物反应连续体
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-04-20 , DOI: 10.1021/acs.est.1c08871
Michael Gonsior ₁ , Leanne Powers ₁ , Madeline Lahm ₁ , Shannon Leigh McCallister ₂

Affiliation

^{这一观点挑战了我们目前对海洋碳循环的理解，包括对大量14} C-DOM 测量的替代解释。我们建议采用先前使用动力学数据为海洋湖泊和沉积物建立的碳反应性连续体概念，并将其称为海洋 DOM 反应性连续体。我们需要对地表水 DOM 浓度和反应性的生物地球化学驱动因素、生物碳泵效率以及作为海洋 DOM 最终但可变来源的自养群落有一个基本的了解。这一观点旨在将我们的注意力转移到更具包容性的动力学模型上，并可能引导我们更准确地评估海洋 DOM 在全球碳循环中发挥的积极和动态作用。目前，仍然缺乏建立和验证这种海洋 DOM 反应性连续体模型的动力学数据，其分辨率取决于新的有机示踪剂的发现，这些示踪剂的反应性和微生物降解率存在巨大差异。我们可能需要重新集中精力破译海洋有机分子在动力学背景下的结构和反应性，包括深海中存在的微生物和物理化学对分子反应性的限制。

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New Perspectives on the Marine Carbon Cycle–The Marine Dissolved Organic Matter Reactivity Continuum

This perspective challenges our current understanding of the marine carbon cycle, including an alternative explanation of bulk ¹⁴C-DOM measurements. We propose the adoption of the carbon reactivity continuum concept previously established for lakes and sediments for the oceans using kinetic data and term this the marine DOM reactivity continuum. We need to gain a fundamental understanding of the biogeochemical drivers of surface water DOM concentrations and reactivity, biological carbon pump efficiency, and the autotrophic communities that are the ultimate but variable sources of marine DOM. This perspective is intended to shift our focus to a more inclusive kinetic model and may lead us to a more accurate assessment of the active and dynamic role marine DOM plays in the global carbon cycle. Currently, the kinetic data to establish and validate such a marine DOM reactivity continuum model are still lacking, and their resolution depends on the discovery of new organic tracers that span large differences in reactivity and microbial degradation rates. We may need to refocus our efforts in deciphering the structure and reactivity of marine organic molecules in a kinetic context, including the microbial and physicochemical constraints on molecular reactivity that are present in the deep ocean.

更新日期：2022-04-20

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