The Autumn-winter Response of Air Temperature to the Blocking Frequency in the Atlantic-Eurasian Sector

IF 1.4 4区地球科学 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES Russian Meteorology and Hydrology Pub Date : 2024-02-06 DOI:10.3103/s1068373923110018

O. Yu. Antokhina, P. N. Antokhin, O. S. Zorkal’tseva, Yu. V. Martynova, A. V. Gochakov, V. I. Mordvinov

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Abstract

The changes in the response of air temperature to the variations in the instantaneous blocking frequency (IBF) (\(\mathrm{GHGS} > 0\)) between the periods 1979–1999 and 2000–2020 are studied. Blocking patterns, which are the spatial distributions of the coefficients of correlation between the IBF and the 1000 hPa temperature field, are used as the main characteristic. The blocking frequency is calculated in ten longitudinal sectors in the eastern direction from the west of the North Atlantic region to the eastern borders of Siberia and the Pacific Ocean. It is found that blocking patterns moved northward over the Atlantic region (November, December, and February), the Ural region and Siberia (November, January, and February) in 2000–2020. In addition, they were characterized by more pronounced areas of negative correlations over Eurasia and North America as compared to 1979–1999. Along with the pronounced correlation pattern of the Atlantic region, the patterns of the Ural region and Western Siberia (U-WS) proved to be the most significant. It is assumed that the IBF variability over the U-WS sector is an important indicator of the development of the most significant blocking processes over Eurasia in terms of the temperature regime anomalies. The influence of U-WS blockings was the least noticeable in 2000–2020 for December and in 1979–1999 for January, when the response of the temperature field to the blocking changes was similar to the response of the negative phase of the North Atlantic Oscillation.

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大西洋-欧亚板块秋冬季气温对阻塞频率的响应

摘要研究了1979-1999年和2000-2020年期间气温对瞬时阻塞频率（IBF）（\(\mathrm{GHGS} >0\)）变化的响应变化。阻塞模式是 IBF 与 1000 hPa 温度场之间相关系数的空间分布，被用作主要特征。计算了从北大西洋地区西部到西伯利亚和太平洋东部边界的东部方向十个纵向扇形的阻塞频率。结果发现，在 2000-2020 年间，阻塞模式在大西洋地区（11 月、12 月和 2 月）、乌拉尔地区和西伯利亚地区（11 月、1 月和 2 月）向北移动。此外，与 1979-1999 年相比，欧亚大陆和北美洲上空的负相关区域更为明显。除了大西洋地区的明显相关模式外，乌拉尔地区和西西伯利亚西部（U-WS）的模式被证明是最重要的。据推测，就温度机制异常而言，U-WS 地区的 IBF 变率是欧亚大陆上空最重要的阻塞过程发展的一个重要指标。在 2000-2020 年的 12 月和 1979-1999 年的 1 月，U-WS 阻塞的影响最不明显，当时温度场对阻塞变化的响应与北大西洋涛动负相的响应相似。

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来源期刊

Russian Meteorology and Hydrology METEOROLOGY & ATMOSPHERIC SCIENCES-

CiteScore

1.70

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Russian Meteorology and Hydrology is a peer reviewed journal that covers topical issues of hydrometeorological science and practice: methods of forecasting weather and hydrological phenomena, climate monitoring issues, environmental pollution, space hydrometeorology, agrometeorology.