Low-frequency characteristics of winter-time cold air activity in the Beijing-Tianjin-Hebei region and the impacts of low-frequency variation of the Siberian High
MA Ning, HE Liye, LIANG Sujie, GUO JunTianjin Climate Center, Tianjin 300074, China
National Natural Science Foundation of China.41805061 National Key R&D Program of China.2018YFC1505604 The Doctoral Fund of Tianjin Meteorological Administration.201628bsjj01
作者简介 About authors 马宁(1985-),女,河南人,硕士,工程师,主要从事短期气候预测与诊断分析E-mail:esmaning@gmail.com。
Abstract The characteristics of low-frequency oscillation of the cold air activity in the Beijing-Tianjin-Hebei (BTH) region in boreal winter and the impacts of the low-frequency characteristics of the Siberian High (SH) on them are investigated, using daily temperature observational data and NCEP/NCAR reanalysis data with a time span covering 1981-2015, based on power spectrum and composite analysis methods. The results show that both the daily temperature in the BTH region and the SH have a dominant period of 10-30 days in both daily temperature in the BTH region and the SH, and there exist significant lead-lag correlations between the low frequency oscillations of them. The cold surges in the BTH region mainly occur during the descending phase from the zero position to the trough of the low-frequency oscillation of temperature and the descending phase from the peak to the zero position of the low-frequency oscillation of the SH. A low-frequency cycle of abnormal atmospheric circulation propagating from Northwest Asia to Southeast Asia appears near the surface and in the middle layer, along with the low-frequency oscillations of the temperature in the BTH region and the SH. The abnormally low temperature, which affects the BTH region, originates near the Kara Sea and accumulates at the high latitudes of Asia, where a cooling effect is produced continuously. Meanwhile, marked convergent subsidence occurs in the middle layer, owing to the atmospheric convergence caused by the abnormal cyclone at the high latitudes of Asia. The combined effect of the convergent subsidence in the middle layer and the persistent cooling near surface results in an abnormal high, which later enhances and moves southward with the abnormally low temperature near surface. The East Asian Trough in the middle layer intensifies as this abnormal high moves southward, which brings deep-layer northerly wind to the BTH region. As a result, the cold air activity in the BTH region is intensified. Keywords:cold air in the Beijing-Tianjin-Hebei region;Siberian High;low-frequency oscillation;atmospheric convergence
PDF (8882KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 马宁, 何丽烨, 梁苏洁, 郭军. 京津冀冬季冷空气过程的低频特征及西伯利亚高压低频变化的影响. 地理学报[J], 2020, 75(3): 485-496 doi:10.11821/dlxb202003004 MA Ning. Low-frequency characteristics of winter-time cold air activity in the Beijing-Tianjin-Hebei region and the impacts of low-frequency variation of the Siberian High. Acta Geographica Sinice[J], 2020, 75(3): 485-496 doi:10.11821/dlxb202003004
Fig. 4Schematic diagram of 8 phases in a period of low-frequency temperature oscillation in winter anddistribution of cold air activity for the 8 phases in the BTH region
Fig. 5Composite distributions of inter-time daily anomalies of SLP (contours), T995 (shaded) and V850 (vector) for the 8 phases of low-frequency temperature oscillation
注:a中滞后日数< 0表示SH超前京津冀气温;b中加粗部分表示京津冀冷空气过程多发阶段。 Fig. 8Lag correlation between the low-frequency oscillation of the SH and the BTH-region temperature (a: lag<0 indicates that SH leads temperature); Daily variations of the low-frequency oscillations of the SH and the BTH-region temperature (b: based on the 16d period)
Fig. 9Composite distributions of winter-time daily anomalies of SLP (contour), T995 (shaded) and V500 (vector) for the 8 phases of low-frequency oscillation of the SH
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