ABR: New Production in the Eastern Equatorial Pacific and its Relation to Flux of Nitrogen and Carbon

ABR：赤道东太平洋的新产量及其与氮和碳通量的关系

• 批准号: 9115929
• 负责人: Richard Dugdale
• 金额: $ 15.96万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-15 至 1994-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115929&HistoricalAwards=false
• 关键词: ABR; New; Production; Eastern; Equatorial

This project represents an accomplishment based renewal for continuing studies of upwelling new production processes. The major goals are to test hypotheses developed from coastal and equatorial measurements and to modify current models of upwelling system new production accordingly. The region selected for the study is Monterey Bay where nitrogen uptake has been measured at 2 weeks intervals for 2 years. The seasonal cycle shows an alternation between open ocean and upwelling conditions allowing a comparison of the 2 regimes, one expected to show open ocean, oligotrophic characteristics and the other eutrophic coastal upwelling parameters. The project seeks to understand the factors which trigger the transition from the one ecosystem to the other. The basic hypothesis is that the process of nitrate incorporation into the primary producers is the key factor in determining the trophic status of a marine ecosystem. Further, previous results indicate that the critical factors in development of new production of bloom proportions are nitrate concentration and ambient irradiance. These 2 factors set boundaries for the acceleration process between low new production conditions and high new production. The results of this project will contribute to global models of new production and its impact on carbon cycling. The results should be especially helpful in understanding the role of upwelling ecosystems in global new production and carbon cycling.

该项目代表了对上涌新生产工艺的持续研究的一种基于成就的更新。主要目标是检验从沿海和赤道测量中得出的假设，并相应地修改目前上升流系统新产品的模型。研究选择的地区是蒙特利湾，在那里每隔两周测量一次氮吸收量，持续两年。季节周期显示了开放海洋和上升流条件之间的交替，允许对两种情况进行比较，其中一种预计显示开放海洋，少营养特征和其他富营养化沿海上升流参数。该项目旨在了解触发从一个生态系统过渡到另一个生态系统的因素。基本假设是，硝酸盐进入初级生产者的过程是决定海洋生态系统营养状况的关键因素。此外，以往的研究结果表明，硝酸盐浓度和环境辐照度是影响新产品开花比例的关键因素。这两个因素为加速过程设定了低新生产条件和高新生产条件之间的界限。该项目的结果将有助于建立新生产的全球模型及其对碳循环的影响。这些结果将特别有助于理解上升流生态系统在全球新产量和碳循环中的作用。