ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 49 Issue 7 > 2023,49(7):881-891. DOI:10.7519/j.issn.1000-0526.2023.060801 Prev Next
Atmospheric Circulation Characteristics of Northern Hemisphere in Winter 2022/2023 and Its Impact on Weather and Climate of China
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Abstract:
In the winter of 2022/2023, the average temperature in China was 0.2℃ higher than normal, and the temperature in most of China was warmer than normal. The average precipitation was 24.6% less than normal, showing a spatial distribution pattern of more in the north and less in the south of China. The standardized East Asia winter monsoon index was 0.25, slightly stronger than normal. The standardized Siberian high intensity index was 0.47, which was also slightly stronger than normal. The Arctic oscillation index of the winter was -0.6 with a significant phased characteristic feature of being negative in the earlier winter and positive in the later winter.The intensity index of Northwest Pacific subtropical high was -45.6 gpm, which was weaker than normal. In winter 2022/2023, the 500 hPa geopotential height field in the middle and high latitudes of Eurasia was high in the west and low in the east. The geopotential height field in North China and Northeast China was at a lower altitude, but the geopotential height field in other regions of China was higher. The winter atmospheric circulation had significant intraseasonal variation characteristics, with the strong meridional circulation in December 2022 and the zonal circulation in February 2023. The corresponding winter monsoon also showed the trend of strong in earlier winter but weak in later winter. Correlation analysis of sea surface temperature and height fields shows that there was a significant negative correlation between the North Atlantic sea surface temperature (NAT) in August and September and the height fields of Ural Mountains Region in December. The abnormal negative phase (positive phase) of NAT in the early stage was conducive to the strengthening (weakening) of the meridional circulation in East Asia in the earlier stage of winter.
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P461
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