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Changes in General Atmospheric Circulation in the Northern Hemisphere in 1998–2018
Russian Meteorology and Hydrology ( IF 0.7 ) Pub Date : 2021-01-18 , DOI: 10.3103/s1068373920100015
N. V. Vakulenko , N. M. Datsenko , D. M. Sonechkin

Abstract

The analysis of systematic changes in the Northern Hemisphere 500 hPa geopotential height field is performed. The dataset of the 5-day mean values of 500 hPa geopotential height during 1998–2018 is used for this purpose and is represented by the coefficients of its expansions in spherical functions. It is found that the hemispheric mean value of 500 hPa geopotential height increased by 1.0–2.0 dam during the analyzed 20-year period depending on a season. The west-to-east propagation of air particles in the mid-latitudes systematically weakened in the cold season (January, October) but increased in the warm season (April, July). A small negative trend in the amplitudes of some ultralong waves is detected. This can facilitate a weakening of the planetary blocking of zonal circulation. Besides, a weak positive trend in the amplitudes of some synoptic waves is found, which can favor an increase in the cyclone activity.



中文翻译:

1998-2018年北半球大气环流的变化

摘要

进行了北半球500 hPa地势高度场中系统变化的分析。为此,使用了1998-2018年500hPa地势高度的5天平均值数据集,并用其在球面函数中的膨胀系数表示。发现在分析的20年期间内,根据季节,500 hPa地势高度的半球平均值增加了1.0–2.0 dam。在寒冷季节(1月,10月),中纬度地区的空气粒子从西向东的传播被系统减弱,而在温暖季节(4月,7月)则有所增加。在一些超长波的振幅中检测到小的负趋势。这可以促进减弱纬向环流的行星阻塞。除了,

更新日期:2021-01-18
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