Abstract
This study investigates the influences of boreal summer intraseasonal oscillation (BSISO), which originates from the equatorial Indian Ocean and prevails over the Indo-Pacific region, on precipitation over Southeast China, including South China and Yangtze River Valley. The results indicate that the BSISO-related precipitation anomalies are remarkably different between early summer (May–June) and late summer (July–August). The BSISO-related precipitation anomalies tend to appear more northward in late summer in comparison with early summer. Accordingly, the BSISO is significantly related to precipitation anomalies over South China during many phases in early summer but related to very weak anomalies during all the phases in late summer. Such northward shifts of precipitation anomalies from early summer to late summer are clearest during phases 4 and 7, when the lower-tropospheric anticyclonic and cyclonic circulation anomalies dominate over the subtropical western North Pacific, respectively. Finally, we explain the differences between early and late summers through the seasonal northward migration of climatological equivalent potential temperature gradient, which is located in the South China during early summer but migrates northward to the YRV during late summer.
摘 要
本文研究了夏季季节内振荡 (BSISO) 对中国东南地区 (包括南部的华南地区和北部的长江中下游地区) 前夏 (五至六月) 和后夏 (七至八月) 降水的影响. 结果表明, 夏季季节内振荡在后夏对东南地区降水的影响相较前夏更偏北. 在前夏, 夏季季节内振荡对华南地区的降水有显著的影响. 而后夏, 降水异常则只在长江中下游地区是显著的. 这种前、 后夏降水异常的南北分布差异在夏季季节内振荡第4、 第7位相最为明显, 分别对应西北太平洋反气旋、 气旋异常. 最后, 我们从背景相当位温的角度解释了夏季季节内振荡在前、 后夏的不同影响. 在前夏, 对流层低层背景相当位温显著向北递减出现在华南地区, 这种背景场有利于降水异常在华南地区形成. 随着东亚夏季风的演变, 后夏相当位温显著向北递减的区域出现在长江中下游地区, 因此夏季季节内振荡在后夏对降水的影响只在长江中下游地区显著.
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Acknowledgements
The authors highly appreciate the reviewers for their constructive comments, which were most helpful for modulating the discussion on physical mechanism and improving the presentation. This work was supported by the National Natural Science Foundation of China (Grant No. 41721004).
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• The BSISO-related precipitation anomalies tend to appear more northward in late summer in comparison with early summer.
• The BSISO corresponds significantly to the precipitation anomalies over the South China in early summer but very weak anomalies in late summer.
• The remarkable difference is attributed to the northward shifts of climatological equivalent potential temperature gradient from early to late summer.
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Liu, J., Lu, R. Different Impacts of Intraseasonal Oscillations on Precipitation in Southeast China between Early and Late Summers. Adv. Atmos. Sci. 39, 1885–1896 (2022). https://doi.org/10.1007/s00376-022-1347-4
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DOI: https://doi.org/10.1007/s00376-022-1347-4