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.

跟踪溶解有机物的时间和空间变异性，其成岩状态和在北大西洋地区各种布鲁姆州的生物利用度：1537943北大西洋浮游植物盛开是每年都有最明显的生物学事件之一。这种花朵代表了生物活性的热点，在此过程中，通过与布鲁姆相关的食物网络过程产生大量溶解有机物。虽然最近的工作已经阐明了北大西洋盛开期间溶解有机物的空间分布，但缺乏北大西洋灌木丛中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的时间和空间动力学，其组成可变性以及控制北大西洋中其积累，持久性和出口的机制。该项目将利用一个名为北大西洋气溶胶和海洋生态系统研究（NAAMES）的大型，最近资助的NASA现场计划，旨在评估北大西洋浮游植物蓬勃发展的基本控制，其幅度和年度变异性。这项研究的结果将在北大西洋浮游植物Bloom的背景下提供对碳循环的机械理解。这项研究将在加利福尼亚大学进行？圣塔芭芭拉（Santa Barbara）是一家西班牙裔服务机构，将涉及从小学到研究生院的学生的教育机会。检查北大西洋中溶解有机物的空间分布与水量质量通风率的测量相结合，据估计，碳质量的空间分布与水量质量通风率的测量相结合，估计有大量碳被逐渐出口到了地表中，而不是在水上散发出深处的水。但是，溶解有机物知识的总体差距是缺乏研究溶解有机物生产，积累或由于变化的花朵阶段和浮游植物周期的质量和生物利用度的变化所需的机制所需的宝贵时间分辨率。这项研究将研究与北大西洋春季浮游植物浮游相关的四个不同阶段的反复子午线沿溶解有机物动力学的时间和空间变化，包括1）预塑料，混合阶段，2）营养繁殖 - 养分繁殖，生物量相位，3）营养质量降低的生物量相位阶段和4）后期的分层。这将通过将自动源原位传感器的连续水柱和表面层生态系统属性耦合，以及具有四个26天协调的船和空中田间活动的卫星观测。