JGOFS: Response of Arabian Sea Phytoplankton Biomass, Pigmentation, Growth Rates, and Community Structure To Seasonally Varying Physically Forcing

JGOFS：阿拉伯海浮游植物生物量、色素沉着、生长速率和群落结构对季节性变化的物理强迫的响应

• 批准号: 9311244
• 负责人: Ralf Goericke
• 金额: $ 36万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311244&HistoricalAwards=false
• 关键词: JGOFS; Response; Arabian; Sea; Phytoplankton

9311244 Goericke The U.S. Arabian Sea JGOFS program offers the unique opportunity to study the response of an oceanic ecosystem to strong and seasonally predictable physical forcing in an environment with strong spatial gradients. Biological conditions in the Arabian Sea vary from extreme oligotrophy to extreme eutrophy. Primary production and concentrations of chlorophyll a, for example, change by one to two orders of magnitude over space and time. We propose to study the effects of the seasonally varying physical forcing on the phytoplankton community as a whole and on individual populations of microalgae, using primarily pigment-based methods. We will test the hypothesis, suggested by data from other environments, that phytoplankton community structure and growth rates during most of the year. The exception is the area off Oman during the SW monsoon when oceanic upwelling occurs. At this time the community is expected to be dominated by diatoms growing at high rates. Phytoplankton community structure will be monitored by measuring the concentration of taxon-specific chlorophylls and carotenoids by high-pressure liquid chromatography. It is proposed to carry out theqe analyses as part of the JGOFS core measurements. Using the pigment 14c-labeling method we propose to measure phytoplankton carbon-biomass, phytoplankton growth rates and taxon-specific growth rates to study the physiological response of the phytoplanton community to the seasonally varying physical forcing. Carbon to Chl a ratios will be calculated from phytoplankton biomass and chl a and used to calculated seasonal maps of phytoplankton carbon-biomass for the Arabian Sea from remotely sensed ocean and biomass will allow us to determine factors which control the growth and abundance of the individual phytoplankton population, such as coccolithophores or prochlorophytes, and their contribution to carbon cycling in this environment.

小行星9311244 美国阿拉伯海JGOFS计划提供了一个独特的机会，研究海洋生态系统在具有强烈空间梯度的环境中对强烈和季节性可预测的物理强迫的反应。 阿拉伯海的生物条件从极端贫养到极端富养不等。 例如，叶绿素a的初级生产和浓度随时间和空间的变化而变化一到两个数量级。 我们建议研究的影响，季节性变化的物理强迫浮游植物群落作为一个整体，并对个别种群的微藻，主要使用基于色素的方法。 我们将测试的假设，建议从其他环境中的数据，浮游植物群落结构和增长率在一年中的大部分时间。 唯一的例外是在西南季风期间发生海洋上升流的阿曼海域。 在这个时候，社区预计将占主导地位的硅藻增长率很高。 浮游植物群落结构将通过高压液相色谱法测量特定分类群叶绿素和类胡萝卜素的浓度来监测。 建议将qe分析作为JGOFS核心测量的一部分进行。 利用14c标记的方法，我们建议测量浮游植物的碳生物量，浮游植物的生长速率和分类特定的生长速率，研究植物群落的生理响应的季节性变化的物理强迫。 碳与叶绿素a的比率将从浮游植物生物量和叶绿素a中计算出来，并用于计算阿拉伯海从遥感海洋和生物量中获得的浮游植物碳生物量季节图，这将使我们能够确定控制单个浮游植物种群（如颗石藻或原绿藻）的生长和丰度的因素，以及它们对该环境中碳循环的贡献。