Response of Northern Hemisphere Midlatitude Circulation to Arctic Amplification in a Simple Atmospheric General Circulation Model
Response of Northern Hemisphere Midlatitude Circulation to Arctic Amplification in a Simple Atmospheric General Circulation Model
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DOI：
10.1175/jcli-d-15-0602.1
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发表时间：
2016-03
影响因子：
4.9
通讯作者：
Yutian Wu;Karen L. Smith
中科院分区：
文献类型：
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作者：
Yutian Wu;Karen L. Smith
摘要本研究在一个简单的大气环流模式中检验了北方中纬度环流对北极放大（AA）的响应。结果发现，在响应AA，对流层急流向赤道方向移动和平流层极涡减弱，强烈的各种AA强迫强度。尽管如此，平流层突然变暖事件的频率在统计上没有显著变化。此外，为了定量评估平流层-对流层耦合的作用，对流层路径被隔离的平流层纬向平均状态向参考状态轻推。当施加轻推时，使平流层不活跃，对流层急流仍然向赤道方向移动，但与活跃平流层相比，其幅度约为一半。这个差值代表平流层路径和平流层对对流层的向下影响。这表明平流层-对流层耦合。
AbstractThis study examines the Northern Hemisphere midlatitude circulation response to Arctic amplification (AA) in a simple atmospheric general circulation model. It is found that, in response to AA, the tropospheric jet shifts equatorward and the stratospheric polar vortex weakens, robustly for various AA forcing strengths. Despite this, no statistically significant change in the frequency of sudden stratospheric warming events is identified. In addition, in order to quantitatively assess the role of stratosphere–troposphere coupling, the tropospheric pathway is isolated by nudging the stratospheric zonal mean state toward the reference state. When the nudging is applied, rendering the stratosphere inactive, the tropospheric jet still shifts equatorward but by approximately half the magnitude compared to that of an active stratosphere. The difference represents the stratospheric pathway and the downward influence of the stratosphere on the troposphere. This suggests that stratosphere–troposphere coupli...