Origin of the 30–60 Day Oscillation in the LOD and Atmospheric Angular Momentum: New Findings from the UCLA General Circulation Model
Origin of the 30–60 Day Oscillation in the LOD and Atmospheric Angular Momentum: New Findings from the UCLA General Circulation Model
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LOD 和大气角动量 30-60 天振荡的起源：加州大学洛杉矶分校大气环流模型的新发现
DOI：
10.1007/978-1-4684-6399-6_13
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发表时间：
1990
影响因子：
4
通讯作者：
T. Eubanks
中科院分区：
文献类型：
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作者：
S. Marcus;M. Ghil;J. Dickey;T. Eubanks
在日长(LOD)和大气角动量(AAM)数据集中都检测到了30-60天的显著振荡。这项研究考察了在用加州大学洛杉矶分校大气环流模式进行的全球大气数值模拟中产生的AAM波动。在该模式的NH温带外，发现一个30-60天的强AAM(纬向风)振荡，与东北太平洋和大西洋的周期性阻塞有关。耦合的、纬向对称的质量再分布导致大气转动惯量的相干波动。在地面高度设置为零的实验中没有发现季节内振荡，这表明温带30-60天的AAM振荡来自地形。
Significant 30-60 day oscillations have been detected in both length-of-day (LOD) and atmospheric angular momentum (AAM) data sets. This study examines AAM fluctuations arising in a numerical simulation of the global atmosphere, performed with the UCLA General Circulation Model. A strong 30–60 day AAM (zonal wind) oscillation is found in the NH extratropics of the model, associated with periodic blocking over the northeast Pacific and Atlantic oceans. A coupled, zonally-symmetric mass redistribution leads to coherent fluctuations in the atmosphere’s moment of inertia. No intraseasonal oscillations are found in an experiment with surface elevations set to zero, suggesting an orographic origin of the extratropical 30–60 day AAM oscillation.
DOI：
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发表时间：
2007
期刊：
影响因子：
--
作者：
K.Tanaka;P.Felmer;S.Martinez;Takaaki Nishida
通讯作者：
Takaaki Nishida