Influence of Midlatitude Winds on the Stratification of the Equatorial Thermocline
Influence of Midlatitude Winds on the Stratification of the Equatorial Thermocline
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DOI：
10.1175/jpo2845.1
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发表时间：
2006-02
影响因子：
3.5
通讯作者：
M. Nonaka;J. McCreary;S. Xie
中科院分区：
文献类型：
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作者：
M. Nonaka;J. McCreary;S. Xie
摘要赤道温跃层的层结是热带气候动力学的一个关键变量，它通过影响东赤道海洋上升的水温而起作用。在这项研究中，两种类型的海洋模式，海洋环流模式（GCM）和1½层模式，调查的过程中，中纬度风的变化影响赤道层结。具体而言，异常模式水的形成，埃克曼泵，并在副极地海洋夹带的影响进行了研究。“海绵层”邻近的盆地的北方边界的影响也进行了评估。解是由理想化的纬向风和强或弱的中纬度西风所强迫的，它们出现在从赤道延伸到36°N（小盆地）或60°N（大盆地）的矩形盆地中。在大气环流模式解中，对风减弱的一个显著响应是副热带环流西北部混合层变薄，从而导致对流层的减弱。
Abstract The stratification of the equatorial thermocline is a key variable for tropical climate dynamics, through its influence on the temperature of the water that upwells in the eastern equatorial ocean. In this study, two types of ocean models are used, an ocean general circulation model (GCM) and a 1½-layer model, to investigate processes by which changes in the midlatitude winds affect the equatorial stratification. Specifically, the influences of anomalous mode-water formation, Ekman pumping, and entrainment in the subpolar ocean are examined. The effects of a “sponge layer” adjacent to the northern boundary of the basin are also assessed. Solutions are forced by idealized zonal winds with strong or weak midlatitude westerlies, and they are found in rectangular basins that extend from the equator to 36°N (small basin) or to 60°N (large basin). In the GCM solutions, a prominent response to reduced winds is the thinning of the mixed layer in the northwestern region of the subtropical gyre, leading to...