传统的大气环流理论认为，北半球的三个经向环流圈（Hadley、Ferrel和Polar环流）通过相互作用构成了热带、中纬度和极地之间物质和能量交换的重要桥梁。最新的研究发现，北极地区除了传统的Polar环流外，还存在另一个经向环流圈，即Arctic环流。这两个环流圈的强度和位置变化对中高纬度温度和海冰密集度异常有直接的影响。基于各经向大气环流圈对不同纬度带气候以及大气温压场结构对区域气候可能产生的不同影响，本申请项目拟从季节、年际和年代际三个时间尺度，研究北极地区Polar环流和Arctic环流间的耦合作用对中高纬度气候异常的影响机理，并揭示大气温压场扰动结构影响下的北半球中高纬度地表温度和海冰密集度在不同纬度带和区域的异常特征，为中高纬地区的气候预测提供新的思路和方法。

In traditional theories, the interactions among the three meridional cells (the Hadley, Ferrel, and Polar cells) act as the bridges for the exchanges of mass and energy over the tropics, the mid-latitudes, and Polar region. Recent results show a new meridional cell in the Arctic area, the Arctic cell, besides the Polar cell. These two cells exert direct impacts on the surface temperature and sea ice anomalies over the mid-high latitudes. Based on the different potential effects of the meridional cells on different latitudinal bands and temperature-pressure configurations, this project aims to study the effects and underlying mechanisms of the interactions between the Polar and Arctic cells on the climate anomalies over mid-high latitudes from seasonal, interannual, and inderdecadal timescales. Then, we aim to reveal the causes of regional differences in surface air temperature and sea ice over the mid-high latitudes of North Hemisphere by exploring the temperature-pressure characteristics. This project will enhance our understanding on the role of meridional cells in the climate system over mid-high latitudes, and then provide new perspectives for the climate projections there.