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.

北大西洋浮游植物水华是每年记录的最显著的生物事件之一。这种水华代表了生物活动的热点，在此期间，通过水华相关的食物网过程产生了大量的溶解有机物。虽然最近的工作已经揭示了一些在北大西洋水华期间溶解有机物的空间分布，溶解有机物的变化在北大西洋水华的背景下，时间分辨率是缺乏。该项目旨在了解溶解有机物的时空动态、其成分变异性以及控制其在北大西洋积累、持久性和输出的机制。该项目将利用最近资助的一个大型NASA实地项目，称为北大西洋气溶胶和海洋生态系统研究（NAAMES），旨在评估北大西洋浮游植物水华的基本控制，其规模和年际变化。从这项研究的结果将提供一个机械的理解碳循环的背景下，北大西洋浮游植物水华。这项研究将在加州大学进行？圣巴巴拉，一个为西班牙裔服务的机构，并将涉及从小学到研究生院的学生的教育机会。最近的工作审查溶解有机物的空间分布在北大西洋耦合到测量水体通风率估计，大量的碳是垂直出口的海洋表层到深层沃茨作为溶解有机物。然而，在溶解有机物知识的一个总体差距是缺乏有价值的时间分辨率调查控制溶解有机物的生产，积累，或其质量和生物利用度的变化，作为一个结果，不断变化的水华阶段和浮游植物周期的机制。本研究将探讨溶解有机物动态沿着一个重复的纬向样带在四个不同的阶段与北大西洋春季浮游植物水华，包括1）前水华，混合阶段，2）营养丰富，增加生物量阶段，3）营养胁迫，减少生物量阶段，和4）后水华分层阶段。这将通过将来自自主原位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次为期26天的协调船舶和空中实地活动相结合来实现。