Dynamics of Basin-Scale Arctic Ocean Circulation

盆地尺度北冰洋环流动力学

• 批准号: 0424074
• 负责人: Jiayan Yang
• 金额: --
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0424074&HistoricalAwards=false
• 关键词: Dynamics; Basin; Scale; Arctic; Ocean

The dynamics of large-scale ocean circulation in the Arctic must be very different from that in any lower-latitude ocean basin since the two processes that constitute the leading order dynamics of a basin-scale circulation, i.e., (1) the Sverdrup flow driven by Ekman pumping/sucking and (2) a western boundary layer current that closes the gyre circulation and dissipates the vorticity flux from wind stress, cannot apply to the Arctic Ocean. This is due to the fact that (= df/dy where f is the Coriolis parameter) is nearly zero and to the lack of a western boundary in the Arctic Ocean. Despite the rapid development of modeling capability, a basic understanding of the dynamics that govern the basin scale ocean circulation and its variability in the Arctic has yet to be developed. Funds are provided to address this issue using process-oriented models. The project objectives are to understand (1) which processes balance the surface forcing in the ocean interior; (2) how and where the vorticity flux from the curl of surface stress is dissipated so that a quasi-steady circulation can be maintained; (3) how the Arctic Ocean responds to changes in the forcing field in an environment where planetary Rossby waves are stagnant due to approaching zero; (4) the role of boundary currents in establishing the basin-scale circulation; and (5) the effects of bottom topography. Both wind-driven and thermohaline circulation will be studied. The PI plans to use the simplest possible, yet adequate, models to address each of these issues. The results, however, will be tested in Ocean General Circulation Models (OGCMs) through collaboration with a major Arctic Ocean modeling consortium. The PI and Dr. A. Proshutinsky (also at WHOI), who leads the Arctic Ocean Model intercomparison Project (AOMIP), which focuses on the development of 3-D OGCMs, have agreed to work closely for testing the results from this process-oriented study in various OGCMs that AOMIP is currently running. The results of a successful project will help guide development, interpretation, and verification of predictive models of Arctic Ocean circulation. Such models are necessary for the prediction of climate change and pollutant transport pathways, amongst other applications.

北极大尺度海洋环流的动力学必然与任何低纬度海盆的动力学大不相同，因为构成海盆尺度环流的主导动力学的两个过程，即，(1)由Ekman抽吸驱动的Sverdrup流和（2）关闭涡旋环流并耗散风应力引起的涡度通量的西边界层流不适用于北冰洋。 这是由于（= df/dy，其中f是科里奥利参数）几乎为零，以及北冰洋没有西部边界。 尽管建模能力的快速发展，一个基本的了解，在北极流域尺度的海洋环流及其变化的动力学还有待开发。 为解决这一问题提供了资金，采用面向过程的模式。 该项目的目标是了解（1）哪些过程平衡海洋内部的表面强迫;（2）表面应力旋度产生的涡度通量如何和在何处消散，以便维持准定常环流;（3）在行星Rossby波因接近零而停滞的环境中，北冰洋如何对强迫场的变化作出反应;（4）边界流在建立流域尺度环流中的作用;（5）海底地形的影响。 将研究风力和温盐环流。 PI计划使用尽可能简单但足够的模型来解决这些问题。 然而，研究结果将通过与一个主要的北冰洋建模联盟合作，在海洋环流模型（OGCM）中进行测试。 PI和A博士。Proshutinsky（也在WHOI）领导着北冰洋模型相互比较项目（AOMIP），该项目专注于开发3-D OGCM，他同意密切合作，在AOMIP目前正在运行的各种OGCM中测试这一面向过程的研究结果。 一个成功的项目的结果将有助于指导北冰洋环流预测模型的开发、解释和验证。 这些模型对于预测气候变化和污染物迁移途径等应用是必要的。