Cluster analysis of Northern Hemisphere wintertime 500-hPa flow regimes during 1920-2014
Cluster analysis of Northern Hemisphere wintertime 500-hPa flow regimes during 1920-2014
复制标题
1920-2014年北半球冬季500 hPa流态聚类分析
DOI：
10.1175/jas-d-15-0001.1
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发表时间：
2015-09
影响因子：
3.1
通讯作者：
Wallace John M.
中科院分区：
文献类型：
--
作者：
Bao Ming;Wallace John M.
用自组织映射(SOM)方法识别了北半球冬季10天低通滤波的500百帕高度场中的星团。结果基于1)57个冬季的ERA记录和2)NOAA 20世纪再分析(20CR)93个冬季的记录。来自SOM的集群似乎比从Ward方法得到的对应集群更稳健、更线性独立，并且具有类似成员天数的集群在其质心与数据集质心的标准化欧几里德距离方面更有特色。1)北大西洋涛动(NAO)的负极性，2)阿拉斯加阻塞的模式，下游波列延伸到北美和北大西洋，3)西半球气候平均驻波模式的增强，正投射到太平洋-北美(PNA)模式，...
AbstractClusters in the Northern Hemisphere wintertime, 10-day low-pass-filtered 500-hPa height field are identified using the method of self-organizing maps (SOMs). Results are based on 1) a 57-winter record of ERA and 2) a 93-winter record of the NOAA Twentieth-Century Reanalysis (20CR). The clusters derived from SOMs appear to be more robust and more linearly independent than their counterparts derived from Ward’s method, and clusters with comparable numbers of member days are more distinctive in terms of the standardized Euclidean distances of their centroids from the centroid of the dataset. The reproducible SOM clusters in the hemispheric domain are 1) the negative polarity of the North Atlantic Oscillation (NAO), 2) a pattern suggestive of Alaska blocking with a downstream wave train extending over North America and the North Atlantic, 3) an enhancement of the climatological-mean stationary wave pattern in the Western Hemisphere that projects positively upon the Pacific–North America (PNA) pattern,...
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影响因子：
3.2
作者：
E. M. Fitton;C. Brooks
通讯作者：
E. M. Fitton;C. Brooks
影响因子：
4.9
作者：
N. Johnson;S. Feldstein;B. Tremblay
通讯作者：
N. Johnson;S. Feldstein;B. Tremblay
影响因子：
4.9
作者：
T. Woollings;A. Hannachi;B. Hoskins;A. Turner
通讯作者：
T. Woollings;A. Hannachi;B. Hoskins;A. Turner
DOI：
10.1175/1520-0450(1973)012
发表时间：
1973-06
期刊：
Journal of Applied Meteorology
影响因子：
--
作者：
A. Betts;F. J. Dugan
通讯作者：
A. Betts;F. J. Dugan
影响因子：
3.1
作者：
D. Waliser;K. Lau;Jae-Hoon Kim
通讯作者：
D. Waliser;K. Lau;Jae-Hoon Kim