GLOBEC 2000: Nested Interdisciplinary Models for the Gulf of Alaska

GLOBEC 2000：阿拉斯加湾的嵌套跨学科模型

• 批准号: 0113461
• 负责人: Dale Haidvogel
• 金额: $ 57.16万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-15 至 2007-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0113461&HistoricalAwards=false
• 关键词: GLOBEC; 2000; Nested; Interdisciplinary; Models

As part of an ongoing GLOBEC-funded interdisciplinary modeling effort for the Coastal Gulf of Alaska, this study includes the following technical objectives: higher spatial resolution and nested grid capabilities for regional circulation modeling, nested mesoscale atmospheric modeling and regional wind and buoyancy forcing, and a deep-ocean NPZ model to provide boundary conditions for an existing coastal NPZ model. Present single-year simulations of these models will be expanded to continuous multi-decadal integrations, designed to provide circulation and prey fields to an individual-based model of juvenile salmon. Together, these coupled models will be used to explore the mechanisms by which interannual/interdecadal variability of physical fields affect the production of GLOBEC target zooplankton species and the feeding of juvenile salmon in the CGOA. The ecosystem dynamics of these models will be compared with those developed under GLOBEC for the California Current System. Central scientific issues include: 1) The "optimal stability window" hypothesis where Gargett has suggested that variations in the Aleutian Low affect salmon through their impact on water column stability in the CGOA and CCS systems. Typically, high nutrient but low light conditions are observed in the subarctic gyre adjacent to the CGOA, in contrast to low nutrient but high light conditions in the subtropical gyre adjacent to the CCS. And 2) The source of nutrients of the CGOA, i.e., the Coastal Gulf Alaska is a downwelling system for nearly all of the year. The adverse pressure gradient so produced should work against the supply of deep nutrients to the shelf, whether that shelf is smooth and straight or (as is the case in the CGOA) punctuated by submarine canyons. These comparison will help elucidate the observed (inverse) covariance of salmon in the two systems on decadal time scales.

作为正在进行的GLOBEC资助的阿拉斯加沿海海湾跨学科建模工作的一部分，这项研究包括以下技术目标：更高的空间分辨率和嵌套网格能力，区域环流建模，嵌套中尺度大气建模和区域风和浮力强迫，以及深海NPZ模型，为现有的沿海NPZ模型提供边界条件。目前的单年模拟这些模型将扩大到连续的几十年的整合，旨在提供流通和猎物领域，以个人为基础的模型的少年鲑鱼。总之，这些耦合模型将被用来探索物理场的年际/年代际变化影响GLOBEC目标浮游动物物种的生产和幼鲑在CGOA喂养的机制。这些模型的生态系统动力学将与GLOBEC下开发的加州当前系统进行比较。核心科学问题包括：1）“最佳稳定窗口”假说，其中加吉特提出阿留申低压的变化通过影响CGOA和CCS系统中的水柱稳定性来影响鲑鱼。通常情况下，高营养，但低光照条件下观察到在亚北极环流邻近的CGOA，在低营养，但高光照条件下，在亚热带环流邻近的CCS。 和2）CGOA的营养源，即，阿拉斯加沿海海湾几乎全年都是下降流系统。这样产生的逆压梯度应该会阻碍向大陆架提供深层营养物质，无论大陆架是平坦笔直的，还是（如CGOA的情况）被海底峡谷所打断。这些比较将有助于阐明所观察到的（逆）协方差的鲑鱼在两个系统的十年时间尺度。