...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Marine Environmental Engineering >Assessment of the Evolution of Water-Column Stratification Following the Hypothetical Implementation of Widespread Controlled Upwelling in the North Pacific Subtropical Gyre
【24h】

Assessment of the Evolution of Water-Column Stratification Following the Hypothetical Implementation of Widespread Controlled Upwelling in the North Pacific Subtropical Gyre

机译：假设在北太平洋副热带地区广泛控制上升流的假设实施后，水柱分层演化的评估

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The concept of widespread controlled up-welling proposed by Karl and Letelier (2008; Mar. Ecol. Prog. Ser. 364:257-268) is examined in a time-domain one-dimensional advection diffusion model of the oceanic water column for conditions representative of the North Pacific Subtropical Gyre (NPSG). Temperature is a proxy for potential density. When unstable stratification occurs in the time-stepping numerical algorithm, local homogenization is allowed to mimic buoyancy-driven mixing. Steady-state as well as time-varying solutions of the temperature field are calculated under various upwelling scenarios. Results suggest that upwelling rates exceeding the model's background vertical advection rate (≈4m yr~(-1)) would profoundly affect upper ocean stratification. With large upwelling rates, the temporary cooling of the mixed layer would trigger a large compensating heat input from the atmosphere. High downward return advection rates associated with the controlled upwelling process would then transport this heat to deeper layers. In the long run, a net ocean warming would occur as well as a deepening of the mixed layer. This suggests that the potential carbon sequestration benefits from widespread controlled upwelling across the NPSG are unlikely to exceed 0.1 Gt C yr~(-1). Finally, it is argued that Ocean Thermal Energy Conversion (OTEC) electricity production throughout the NPSG should be considered for comparative purposes since OTEC also would use large amounts of deep seawater. For comparable flow rates, it is shown that OTEC systems would provide a much more effective atmospheric carbon control tool if they replaced fossil-fuel thermal power plants.
机译：由Karl和Letelier（2008; Mar. Ecol。Prog。Ser。364：257-268）提出的广泛控制上升流的概念在海洋水柱的时域一维对流扩散模型中进行了研究北太平洋亚热带环流（NPSG）的代表。温度是电位密度的代表。当在时间步长数值算法中发生不稳定的分层时，可以使用局部均化来模拟浮力驱动的混合。在各种上升情况下，计算了温度场的稳态解和时变解。结果表明，上升速率超过模型背景垂直对流速率（≈4myr〜（-1））将对上层海洋分层产生深远影响。在上升速率大的情况下，混合层的暂时冷却将触发来自大气的大量补偿热量输入。与受控的上升流过程相关的高的向下回流对流速率会将这些热量传递到更深的层。从长远来看，将会出现海洋净变暖以及混合层加深的现象。这表明，整个NPSG广泛受控的上升流所带来的潜在碳固存收益不可能超过0.1 Gt C yr〜（-1）。最后，有争议的是，出于比较目的，应考虑整个NPSG的海洋热能转换（OTEC）发电量，因为OTEC也将使用大量深海水。对于可比较的流量，表明如果OTEC系统代替化石燃料热电厂，它们将提供更有效的大气碳控制工具。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号