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Strong highs over the Arctic (1965-2014)
Climate Research ( IF 1.1 ) Pub Date : 2019-05-02 , DOI: 10.3354/cr01559
Z Bielec-Bąkowska , T Niedźwiedź

ABSTRACT: The main aim of the study was to determine the seasonal and long-term variability of strong high occurrence in the Arctic. The research was based on average daily air pressure values at sea level for the period 1965-2014 at grid points (2.5° x 2.5° grid) derived from NCEP/NCAR reanalyses. The Arctic was defined as an area north of 60°N. The main characteristic defining the occurrence of high pressure and strong high pressure systems was a day in which the pressure at a given grid point was ≥1020 and ≥1030 hPa, respectively. The results obtained revealed large seasonal differences in strong high occurrence in the Arctic. They occur the least frequently (usually once a month) from June to August. In subsequent months, strong highs are more frequent, and from December to February, strong highs occur even several times a month. In terms of the number of days with high pressure and the number of days with strong highs, Greenland, the Siberian part of the Arctic, and the area covering the Beaufort Sea, the East Siberian Sea, and part of the Arctic Ocean stand out. Concerning the entire Arctic, the analysis of the long-term variability of strong high occurrence demonstrated that there are signals of a decline in the number of those baric systems during the period investigated. Decreasing tendency was the strongest up to the 1990s. However, since the beginning of the 21st century, the number of strong highs has increased again.

中文翻译:

北极高空(1965-2014)

摘要:这项研究的主要目的是确定北极强烈高发季节的季节性和长期变化。该研究基于1965-2014年期间从NCEP / NCAR重新分析得出的网格点(2.5°x 2.5°网格)上的海平面平均日气压值。北极定义为北纬60°以北的区域。决定高压和强高压系统发生的主要特征是一天中给定格点处的压力分别≥1020 hPa和≥1030 hPa。所获得的结果表明,北极的高发生率存在很大的季节性差异。从6月到8月,它们的发生频率最低(通常每月一次)。在随后的几个月中,更经常出现高点,从12月到2月,每个月甚至有几次出现高点。从高压天数和高强天数来看,格陵兰岛,北极的西伯利亚部分以及波弗特海,东西伯利亚海和北冰洋的一部分地区脱颖而出。关于整个北极,对强高发事件的长期变异性的分析表明,在所调查的时期内,有迹象表明这些重压系统的数量有所减少。下降趋势是1990年代以来最强的趋势。但是,自21世纪初以来,高点的数量再次增加。关于整个北极,对强高发事件的长期变异性的分析表明,在所调查的时期内,有迹象表明这些重压系统的数量有所减少。下降趋势是1990年代以来最强的趋势。但是,自21世纪初以来,高点的数量再次增加。关于整个北极,对强高发事件的长期变异性的分析表明,在所调查的时期内,有迹象表明这些重压系统的数量有所减少。下降趋势是1990年代以来最强的趋势。但是,自21世纪初以来,高点的数量再次增加。
更新日期:2019-05-02
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