Comparing the Roles of Barotropic versus Baroclinic Feedbacks in the Atmosphere’s Response to Mechanical Forcing
Comparing the Roles of Barotropic versus Baroclinic Feedbacks in the Atmosphere’s Response to Mechanical Forcing
复制标题
比较正压与斜压反馈在大气对机械强迫的响应中的作用
DOI：
10.1175/jas-d-13-070.1
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
D. Thompson
中科院分区：
文献类型：
--
作者：
E. Barnes;D. Thompson
正压或斜压涡旋反馈是否主导了大气环流对机械强迫的响应？为了解决这个问题，在理想化的大气环流模式(GCM)和正压模式中都在一定的纬度范围内施加了正压力矩。GCM既包括斜压反馈，也包括正压反馈。正压模式在两种配置下运行：1)只有正压反馈存在；2)通过允许搅拌区与急流一起移动，增加了斜压式反馈。通过系统地在热带和极地之间转换力矩，研究了强迫的纬度和响应之间的关系。通过改变控制急流的位置来研究平均状态的重要性。提出了五个主要发现：1)单独的正压反馈能够产生GCM对机械强迫的响应结构，但不能解释其全部量级。2)斜压过程普遍增多。
AbstractDo barotropic or baroclinic eddy feedbacks dominate the atmospheric circulation response to mechanical forcing?To address this question, barotropic torques are imposed over a range of latitudes in both an idealized general circulation model (GCM) and a barotropic model. The GCM includes both baroclinic and barotropic feedbacks. The barotropic model is run in two configurations: 1) only barotropic feedbacks are present and 2) a baroclinic-like feedback is added by allowing the stirring region to move with the jet. The relationship between the latitude of the forcing and the response is examined by systematically shifting the torques between the tropics and the pole. The importance of the mean state is investigated by varying the position of the control jet.Five main findings are presented: 1) Barotropic feedbacks alone are capable of producing the structure of the GCM response to mechanical forcing but are not capable of accounting for its full magnitude. 2) Baroclinic processes generally increase ...