Tracking the temporal and spatial variability of dissolved organic matter, its diagenetic state and bioavailability during various bloom states in the North Atlantic

跟踪北大西洋各种水华状态期间溶解有机物的时间和空间变化、其成岩状态和生物利用度

• 批准号: 1537943
• 负责人: Craig Carlson
• 金额: $ 66.15万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1537943&HistoricalAwards=false
• 关键词: Tracking; temporal; spatial; variability; dissolved

Tracking the temporal and spatial variability of dissolved organic matter, its diagenetic state and bioavailability during various bloom states in the North AtlanticCraig CarlsonID: 1537943The North Atlantic phytoplankton bloom is among the most conspicuous biological events annually recorded. This bloom represents a hot spot of biological activity during which a significant amount of dissolved organic matter is produced through bloom-associated food web processes. While recent work has shed some light on the spatial distribution of dissolved organic matter during the North Atlantic bloom, temporal resolution of dissolved organic matter variability in the context of the North Atlantic bloom is lacking. This project aims to understand the temporal and spatial dynamics of dissolved organic matter, its compositional variability, as well as the mechanisms that control its accumulation, persistence and export in the North Atlantic. This project will leverage a large, recently funded, NASA field-program called the North Atlantic Aerosols and Marine Ecosystem Study (NAAMES) designed to evaluate the fundamental controls of the north Atlantic phytoplankton bloom initiation, its magnitude and interannual variability. Results from this research will provide a mechanistic understanding of carbon cycling in the context of the North Atlantic phytoplankton bloom. The research will be carried out at the University of California ? Santa Barbara, a Hispanic-serving institution, and will involve educational opportunities for students from elementary through graduate school.Recent work examining the spatial distribution of dissolved organic matter in the North Atlantic coupled to measurements of water mass ventilation rates has estimated that a significant amount of carbon is vertically exported out of the surface ocean to deep waters as dissolved organic matter. However, an overarching gap in dissolved organic matter knowledge is the lack of valuable temporal resolution necessary to investigate the mechanisms that control dissolved organic matter production, accumulation, or its change in quality and bioavailability as a result of changing bloom phases and phytoplankton cycles. This research will examine the temporal and spatial variability of dissolved organic matter dynamics along a repeated meridional transect during four distinct phases associated with the North Atlantic spring phytoplankton bloom including 1) pre-bloom, mixing phase, 2) nutrient-replete, increasing biomass phase, 3) nutrient-stressed decreasing biomass phase, and 4) post bloom stratified phase. This will be accomplished by coupling continuous water column and surface layer ecosystem properties from autonomous in situ sensors, and satellite observations with four 26-day coordinated ship and airborne field campaigns.

跟踪北大西洋不同水华状态期间溶解有机质、成岩状态和生物有效性的时空变异性克雷格·卡尔森ID：1537943北大西洋浮游植物水华是每年有记录的最显著的生物事件之一。这次水华代表了生物活动的一个热点，在此期间，通过与水华相关的食物链过程产生了大量的溶解有机物。虽然最近的工作对北大西洋水华期间溶解有机物的空间分布有了一些了解，但缺乏对北大西洋水华背景下溶解有机物变异性的时间分辨率。该项目旨在了解溶解有机物质的时间和空间动态、其组成的可变性以及控制其在北大西洋的积累、持久性和输出的机制。该项目将利用美国国家航空航天局最近资助的一项名为北大西洋气溶胶和海洋生态系统研究(NAAMES)的大型现场计划，旨在评估北大西洋浮游植物水华爆发的基本控制、其规模和年际变化。这项研究的结果将提供对北大西洋浮游植物水华背景下的碳循环的机制的理解。这项研究将在加州大学进行。圣巴巴拉是一家为拉美裔服务的机构，将为从小学到研究生院的学生提供教育机会。最近研究了北大西洋溶解有机物的空间分布，并测量了水团通风率，估计有相当数量的碳作为溶解有机物垂直从表层海洋输出到深海。然而，溶解有机质知识的一个主要差距是缺乏必要的有价值的时间分辨率来研究控制溶解有机质的产生、积累或其质量和生物有效性的机制，这是水华和浮游植物周期变化的结果。本研究将探讨北大西洋春季浮游植物水华的4个不同阶段(1)水华前期、混合期、2)营养丰富、生物量增加阶段、3)营养胁迫下生物量减少阶段和4)水华后层结阶段，沿重复经向断面的溶解有机质动态的时空变异性。这将通过将来自自主就地传感器的连续水柱和表层生态系统特性以及卫星观测与四个26天协调的舰载和机载现场行动结合起来实现。