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Diurnal cycle of precipitation over Fujian Province during the pre-summer rainy season in southern China

机译：中国南方夏前雨季福建省降水的昼夜循环

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摘要

Precipitation diurnal cycle over Fujian in the pre-summer rainy season has been revealed based on the hourly rain gauge data during 2009-2013. The precipitation amount (PA) over northwestern Fujian and most southeast coasts shows relatively small diurnal variability. This is in contrast to large diurnal variations in the mountainous areas. Regional differences in precipitation diurnal cycles are obviously noted among the coastal, valley, hilly, and mountainous areas. The precipitation diurnal cycles are significantly affected by the terrain elevation and distance to coast, PA and precipitation frequency (PF) show much more pronounced double diurnal peaks with the terrain elevation and distance to coast increased. However, the precipitation intensity (PI) basically shows one distinct late afternoon diurnal peak for different elevations and distances to coast. Four typical patterns of precipitation diurnal cycle are further identified by cluster analysis. The four typical PF patterns show relatively apparent morning peaks over coasts, inland mountains, and hills in addition to distinct late afternoon maxima. Low PF with weak diurnal amplitude is mainly located over the coastal areas, while high PF with strong diurnal amplitude is found over the valley, hilly, and mountainous regions. The PA exhibits a weak early morning peak and a relatively strong late afternoon peak over coastal, hilly, or mountainous areas and windward slopes but only one distinct late afternoon peak over the valley regions and leeward slopes. The amplitude of PA diurnal cycle is the weakest over the coastal areas but the strongest over the valley regions or leeward slopes among the four PA patterns. The four PI diurnal cycle patterns consistently show distinct afternoon peaks.
机译：根据2009-2013年的每小时雨量数据，揭示了福建夏前雨季的降水日周期。福建西北部和大多数东南沿海的降水量（PA）显示出相对较小的日变化。这与山区大的昼夜变化相反。在沿海，山谷，丘陵和山区之间，降水昼夜周期的区域差异明显。降水的昼夜周期受地形高度和到海岸的距离的显着影响，PA和降水频率（PF）随着地形海拔和到海岸的距离的增加显示出更加明显的双昼夜峰。但是，降水强度（PI）基本上显示了一个不同的海拔高度和到海岸距离的下午晚些时候的峰值。通过聚类分析进一步确定了降水日循环的四种典型模式。四个典型的PF模式显示了除了明显的午后最大值以外，在沿海，内陆山脉和丘陵上的相对明显的早晨高峰。昼夜振幅较弱的低PF主要分布在沿海地区，而山谷，丘陵和山区则有昼夜振幅较大的高PF。在沿海，丘陵或山区和迎风坡上，PA表现出较弱的清晨高峰和相对较强的午后高峰，但在山谷地区和背风坡上只有一个明显的午后高峰。在四个PA模式中，PA昼夜周期的振幅在沿海地区最弱，但在谷地区域或背风斜坡最强。 PI的四个昼夜周期模式始终显示出明显的下午高峰。

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  • 来源
    《Theoretical and applied climatology》 |2017年第4期|993-1006|共14页
  • 作者

    Zhang Wei; Huang Anning; Zhou Yang; Yang Ben; Fang Dexian; Zhang Lujun; Wu Yang;

  • 作者单位

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China|Longyan Meteorol Bur, Longyan, Fujian, Peoples R China;

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Chongqing Inst Meteorol & Sci, Chongqing, Peoples R China;

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Atmospher Sci, CMA NJU Joint Lab Climate Predict Studies, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China;

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