JGOFS/SMP: Data-based Models of Food Web Structure and Export Flux

JGOFS/SMP：基于数据的食物网结构和出口通量模型

• 批准号: 0001408
• 负责人: Robert Armstrong
• 金额: $ 33.77万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-15 至 2000-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001408&HistoricalAwards=false
• 关键词: JGOFS; SMP; Data; based; Models

Data-Based Models of Plankton Community Structure and Export FluxIntensive JGOFS investigations over the past decade have indicated strong links among physical-chemical environmental forcing, plankton community structure, and the fate of carbon production (remineralization or export). However, these relationships are crudely portrayed in existing plankton food web models. It is presently unclear how much information on size and taxonomic composition is needed for adequate model predictions and to what extent community dynamics and biogeochemical fluxes in different water masses are linked by common organizational principles and quantitative relationships.The overall goal of the proposed research is to contribute to the mechanistic understanding of the factors that regulate "euphotic zone production and export of carbon and related biologically active substances". To accomplish this, the PIs will develop and evaluate data-based models of plankton community structure and export flux for tropical/subtropical open-ocean ecosystems. This project will focus on the tropical and subtropical oceans, areas most strongly represented in JGOFS Process and Time-series studies (EqPac, Arabian Sea, HOT, BATS) and presently most developed in terms of mature databases and supporting experimental studies. The specific objectives are: 1) to develop data-constrained representations of planktonic community structure and trophic interactions; 2) to construct models of temporal plankton community dynamics and associated biogeochemical fluxes at the Hawaii Ocean Time-series (HOT) site and following iron perturbation in the equatorial Pacific (IronEx II); 3) to compare and test simple parameterizations, for lower trophic level interactions and export fluxes for use in 3-D coupled models; 4) to develop a general tropical ocean model that includes appropriate responses to nutrient supply (Arabian Sea) and iron-limitation (Equatorial Pacific); and 5) to examine model structures and strategies for predicting biologically realistic responses in computationally intensive Global Circulation Models (GCMs). Based on observed similarities in the stocks and process rates in diverse tropical oceanic ecosystems, the PIs hypothesize that the data will lend themselves to representation in a general tropical ocean model with common structure and parameters. To investigate the minimum level of complexity required to capture essential biological realities in global models, they will statistically examine an interrelated spectrum of models, all calibrated to common data sets but differing in structural complexity.

在过去的十年中，基于数据的浮游生物社区结构和出口通量JGOF调查表明，物理化学环境强迫，浮游生物社区结构以及碳生产的命运（回忆或出口）之间存在牢固的联系。 但是，这些关系在现有的浮游食品网络模型中被粗略地描绘了。 目前尚不清楚需要多大有关模型预测的大小和分类学组成的信息，以及不同水量中的社区动态和生物地球化学通量在何种程度上与共同的组织原理和定量关系联系在一起。拟议的研究的总体目标是对调节carbon和相关的corbonic of Caromotic of Caromotic of Carbon和相关因素的影响的总体目标。 为此，PIS将开发和评估基于数据的浮游生物社区结构的模型和热带/亚热带开放式生态系统的出口通量。 该项目将着重于热带和亚热带海洋，在JGOFS过程和时间序列研究（EQPAC，Arabian Sea，Hot，Hot，BATS）中最有力的地区，目前在成熟数据库和支持实验研究方面发达。 具体目标是：1）开发浮游社区结构和营养相互作用的数据约束的表示； 2）在夏威夷海洋时间序列（热）地点（热）构造颞浮游生物群落动力学和相关的生物地球化学通量模型，并在赤道太平洋中的铁扰动之后（Ironex II）； 3）要比较和测试简单的参数化，以供较低的营养水平相互作用和导出通量用于3-D耦合模型； 4）开发一种通用的热带海洋模型，其中包括对营养供应（阿拉伯海）和铁限制（赤道太平洋）的适当反应； 5）检查模型结构和策略，以预测计算密集的全球循环模型（GCM）中生物学上现实的响应。 基于观察到的股票和过程速率的相似性和多种热带海洋生态系统中的过程，PIS假设数据将使自己在具有共同结构和参数的通用热带海洋模型中代表。 为了研究在全球模型中捕获基本生物学所需的最低复杂性水平，他们将统计检查一个相互关联的模型频谱，所有模型均经过校准，但在结构复杂性方面有所不同。