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Spring Extreme Precipitation Days in North China and Their Reliance on Atmospheric Circulation Patterns during 1979–2019
Journal of Climate ( IF 4.9 ) Pub Date : 2022-04-01 , DOI: 10.1175/jcli-d-21-0268.1
Jun Xu 1, 2 , Qinghong Zhang 3 , Baogui Bi 4 , Yun Chen 2
Affiliation  

Abstract The interannual variation of springtime extreme precipitation (SEP) days in North China (NC) and their reliance on atmospheric circulation patterns are studied by using the continuous daily record of 396 rain gauges and the fifth generation of the European Centre for Medium-Range Weather Forecasts atmospheric reanalysis during 1979–2019. The SEP days are defined as the days when at least 10% of rain gauges in NC record daily precipitation no less than 10.5 mm. Results show that the number of SEP days shows large interannual variability but no significant trend in the study period. Using the objective classification method of the obliquely rotated principal analysis in T-mode, we classify the atmospheric circulation into five different patterns based on the geopotential height at 700 hPa. Three circulation patterns all have fronts and are associated with strong southerly wind, leading to 88% of SEP days in NC. The strong southerly wind may provide moisture and dynamic forcing for the frontal precipitation. The interannual variation of SEP days is related with the number of the three above-mentioned dominant circulation patterns. Further analysis shows that the West Pacific pattern could be one of the possible climate variability modes related to SEP days. This study reveals that the daily circulation pattern may be the linkage between SEP days and climate variability modes in NC. Significance Statement Springtime extreme precipitation (SEP) has important social and economic impacts on North China (NC), but few studies have examined the variation of SEP in NC. We find that the number of SEP days has no significant trend but shows large interannual variability during 1979–2019. The interannual variation of SEP days is mainly determined by the total days of three frontal circulation patterns associated with strong southerly wind. Based on the daily circulation pattern, the West Pacific pattern is found to be one of the possible climate variability modes related to SEP days. These findings may shed light on the understanding of SEP in midlatitudes around the world.

中文翻译:

1979-2019年华北春季极端降水日数及其对大气环流模式的依赖

摘要 利用 396 个雨量计的连续日记录和欧洲中期天气中心第五代数据,研究了华北地区春季极端降水(SEP)日的年际变化及其对大气环流模式的依赖。预测 1979-2019 年期间的大气再分析。SEP 天数定义为北卡罗来纳州至少 10% 的雨量计记录的日降水量不小于 10.5 毫米的天数。结果表明,SEP 天数显示出较大的年际变化,但在研究期间没有显着趋势。采用T型斜旋转主分析客观分类方法,根据700 hPa的位势高度将大气环流分为五种不同的模式。三种环流模式都有锋面,并与强南风有关,导致北卡罗来纳州 88% 的 SEP 天数。强烈的南风可能为锋面降水提供水分和动力强迫。SEP天数的年际变化与上述三种主导环流模式的数量有关。进一步分析表明,西太平洋模式可能是与 SEP 日相关的可能气候变率模式之一。该研究表明,日环流模式可能是北卡罗来纳州 SEP 日和气候变率模式之间的联系。意义陈述春季极端降水(SEP)对华北(NC)具有重要的社会和经济影响,但很少有研究考察SEP在华北的变化。我们发现 SEP 天数没有显着趋势,但在 1979-2019 年期间显示出较大的年际变化。SEP日数的年际变化主要由强南风相关的三种锋面环流模式的总日数决定。根据日环流模式,发现西太平洋模式是与SEP日相关的可能气候变率模式之一。这些发现可能有助于了解世界中纬度地区的 SEP。
更新日期:2022-03-23
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