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Investigating the influence of synoptic circulation patterns on regional dry and moist heat waves in North China
Climate Dynamics ( IF 4.6 ) Pub Date : 2021-04-26 , DOI: 10.1007/s00382-021-05769-x
Ning An , Zhiyan Zuo

Summer (June–August) heat waves in North China are found to be either primarily dry or moist, based on surface meteorological observations. This study characterizes synoptic circulation patterns (i.e., 500 hPa geopotential height) using the self-organizing map (SOM) method and investigates the influence of synoptic circulation patterns on these two types of heat waves. Results show that regional dry and moist heat waves are associated with different circulation patterns, which significantly modulate the advection of water vapor within the low-level atmosphere, and soil moisture and evaporation conditions at the surface. Regional dry heat waves are associated with times when a continental high pressure ridge is situated to the northwest of North China, and when the northern edge of the western North Pacific subtropical high (WNPSH) is south of 30° N. Regional moist heat waves are associated with a northward shift of the WNPSH. Long term variations of dry and moist heat wave occurrences correlated significantly with the occurrences of their associated circulation patterns at 0.38 (p = 0.02) and 0.71 (p = 0.00), respectively. On sub-seasonal time scales, the dominant heat wave type transforms from dry in June to moist in late July, which is in accordance with summer north–south WNPSH shifts. In addition, training the SOM with absolute geopotential height results in representative circulation patterns that are closely related to surface heat wave conditions in North China rather than the anomaly field, which mixes different circulation regimes.



中文翻译:

研究天气环流模式对华北地区干湿热浪的影响

根据地面气象观测,发现华北夏季(6月至8月)的热浪主要是干燥的或潮湿的。这项研究使用自组织图(SOM)方法表征天气环流模式(即500 hPa的地势高度),并研究天气环流模式对这两种类型的热波的影响。结果表明,区域干湿热波与不同的循环模式有关,这显着地调节了低层大气中水蒸气的平流,地表土壤水分和蒸发条件。区域高压热浪与大陆高压脊位于华北西北部的时间有关,当西北太平洋副热带高压(WNPSH)的北边缘在30°N以南时,区域湿热波与WNPSH的北移有关。干燥和潮湿热波发生的长期变化与它们相关的循环模式的发生显着相关,分别为0.38(p = 0.02)和0.71(p = 0.00)。在亚季节时间尺度上,主要的热波类型从6月的干燥转变为7月下旬的潮湿,这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。区域湿热浪与WNPSH的北移有关。干和湿热波发生的长期变化与它们相关的循环模式的发生显着相关,分别为0.38(p = 0.02)和0.71(p = 0.00)。在亚季节时间尺度上,主要的热波类型从6月的干燥转变为7月下旬的潮湿,这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。区域湿热浪与WNPSH的北移有关。干和湿热波发生的长期变化与它们相关的循环模式的发生显着相关,分别为0.38(p = 0.02)和0.71(p = 0.00)。在亚季节时间尺度上,主要的热波类型从6月的干燥转变为7月下旬的潮湿,这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。干和湿热波发生的长期变化与它们相关的循环模式的发生显着相关,分别为0.38(p = 0.02)和0.71(p = 0.00)。在亚季节时间尺度上,主要的热波类型从6月的干燥转变为7月下旬的潮湿,这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。干和湿热波发生的长期变化与它们相关的循环模式的发生显着相关,分别为0.38(p = 0.02)和0.71(p = 0.00)。在亚季节时间尺度上,主要的热波类型从6月的干燥转变为7月下旬的潮湿,这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。这与夏季南北WNPSH的变化一致。此外,用绝对地势高度训练SOM会产生代表性的环流模式,这种模式与华北的地表热波条件密切相关,而不是与混合不同环流模式的异常场密切相关。

更新日期:2021-04-27
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