• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Paleoceanography >Arabian Sea response to monsoon variations
【24h】

Arabian Sea response to monsoon variations

机译：阿拉伯海对季风变化的反应

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

This study aims to quantify the impact of strong monsoons on the mixed layer heat budget in the Arabian Sea by contrasting forced ocean general circulation model simulations with composite strong and weak monsoon winds. Strong (weak) monsoons are defined as years with zonal component of the Somali Jet being greater (smaller) by more than a standard deviation of the long-term mean of the National Centers for Environmental Prediction reanalysis winds. Coastal upwelling is shown to be demonstrably stronger for strong monsoons leading to significant surface cooling, shallower thermoclines, and deeper mixed layers. A coupled ecosystem model shows that surface chlorophyll, primary, and export production are indeed higher for strong monsoons compared to weak monsoons driven by the supply of colder, nutrient-rich waters from greater than 100 m depths. The surprising result is that a strong monsoon results in stronger negative wind stress curl away from the coasts and drives Ekman pumping that results in a deeper thermocline. The weaker stratification and larger turbulent kinetic energy from the winds drive deeper mixed layers leading entrainment cooling with some contribution from the advection of colder upwelled waters from the coastal upwelling regions. Thus the strong monsoons, in fact, enhance oceanic heat uptake indicating that ocean dynamics are cooling the surface and driving the lower atmosphere which has implications for the interpretation of monsoon variability from paleorecords.
机译：本研究旨在通过将强迫海洋总环流模型模拟与强，弱季风复合风进行对比，来量化强季风对阿拉伯海混合层热收支的影响。强（弱）季风被定义为年份，其中索马里急流的纬向分量更大（更小）大于国家环境预测中心重新分析风的长期平均值的标准偏差。事实证明，对于强烈的季风而言，沿海上升流明显更强，导致明显的地表降温，较浅的热跃层和较深的混合层。一个耦合的生态系统模型表明，强季风的表层叶绿素，初级产量和出口产量的确高于由大于100 m深度的较冷，营养丰富的水供应驱动的弱季风。令人惊讶的结果是，强烈的季风会导致更强的负风应力远离海岸卷曲，并推动埃克曼抽水，从而导致更深的跃层。风的较弱分层和较大的湍动能驱动更深的混合层，导致夹带冷却，而来自沿海上升流区的上升流较冷水的平流也有一定作用。因此，强季风实际上增强了海洋的热量吸收，表明海洋动力正在冷却地表并推动低层大气，这对从古记录中解释季风变化具有重要意义。

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