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Spatiotemporal Trends and Variability in the Centroid of the Northern Hemisphere's Circumpolar Vortex
Earth and Space Science ( IF 3.1 ) Pub Date : 2021-07-14 , DOI: 10.1029/2020ea001594
Nazla Bushra 1 , Robert V. Rohli 1
Affiliation  

Recent previous research has established the “sharpest gradient” approach to defining the circumpolar vortex and has identified correlations of the area and circularity of the Northern Hemisphere's circumpolar vortex (NHCPV) to important atmospheric-oceanic teleconnections. However, because geographical shifts in the NHCPV, independent of area or circularity changes, could affect surface environmental conditions, this research addresses the question of the extent to which the NHCPV centroid undergoes such shifts, both intra- and inter-annually. Results show that during the 1979–2017 period, the centroid has moved less on a daily basis in more recent years, perhaps indicative of a stabilization in circulation, with annual and semi-annual periodicities in the daily distance moved. A consistent preference toward the Eastern Hemisphere is evident by the displacement of the centroids toward the Pacific basin throughout the study period. Collectively, these results indicate the mid-tropospheric response to the near-surface warming.

中文翻译:

北半球绕极涡旋质心的时空趋势和变异性

最近的研究已经建立了定义极地涡旋的“最陡梯度”方法,并确定了北半球极地涡旋 (NHCPV) 的面积和圆度与重要的大气-海洋遥相关的相关性。然而,由于 NHCPV 的地理变化与面积或圆度变化无关,可能会影响地表环境条件,因此本研究解决了 NHCPV 质心在年内和年间经历这种变化的程度的问题。结果表明,在 1979 年至 2017 年期间,质心在最近几年每天的移动较少,这可能表明循环稳定,每日距离移动的年度和半年度周期性。在整个研究期间,质心向太平洋盆地的位移表明对东半球的一致偏好。总的来说,这些结果表明对流层中层对近地表变暖的响应。
更新日期:2021-08-07
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