Impacts of Interhemispheric Asymmetric Thermal Forcing on Tropical Pacific Climate: Surface Air-Sea Coupling and Subduction
Impacts of Interhemispheric Asymmetric Thermal Forcing on Tropical Pacific Climate: Surface Air-Sea Coupling and Subduction
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DOI：
10.1175/jcli-d-11-00743.1
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发表时间：
2013-01
影响因子：
4.9
通讯作者：
Chun Li;Lixin Wu;S. Xie
中科院分区：
文献类型：
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作者：
Chun Li;Lixin Wu;S. Xie
摘要：古气候观测和模拟研究表明，温带气候变化影响热带太平洋。全球耦合大气环流模型用于研究赤道太平洋对北纬 40° 向下（向上）极地的温带表面热通量强迫的响应。赤道响应由两个不同的阶段组成：纬向海面温度（SST）梯度在前两到三十年加强，然后减弱。第一阶段，地表海气耦合快速反馈机制将温带变暖（变冷）从北（南）太平洋向赤道传达。第二阶段的特点是热带太平洋温跃层出现全盆地浅滩，副热带环流（STC）沿着温跃层从南太平洋平流输送冷水。南半球异常的这种偏好是由于平均环流的经向不对称：STC 的内部通道向南开放，但部分......
AbstractPaleoclimate observations and modeling studies suggest that extratropical climate change affects the tropical Pacific. A global coupled general circulation model is used to investigate the equatorial Pacific response to extratropical surface heat flux forcing that is downward (upward) poleward of 40°N (S). The equatorial response consists of two distinct stages: the zonal sea surface temperature (SST) gradient strengthens for the first two to three decades and then weakens afterward. In the first stage, fast surface air–sea coupling feedback mechanism communicates the extratropical warming (cooling) from the North (South) Pacific toward the equator. The second stage is characterized by a basinwide shoaling of the tropical Pacific thermocline as the subtropical cell (STC) advects cold water from the South Pacific along the thermocline. This preference of Southern Hemisphere anomalies is due to the meridional asymmetry in the mean circulation: the interior pathway for STC is open south but partially...