| 华北地区夏季降水日变化的时空分布特征 |
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| 引用本文： | 韩函,吴昊旻,黄安宁.华北地区夏季降水日变化的时空分布特征[J].大气科学,2017,41(2):263-274. |
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| 作者姓名： | 韩函 吴昊旻 黄安宁 |
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| 作者单位： | 1.南京大学大气科学学院中国气象局-南京大学气候预测研究联合实验室, 南京 210093 |
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| 基金项目： | 国家自然科学基金项目41175086，江苏省青蓝工程项目，江苏省气候变化协同创新中心资助项目 |
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| 摘 要： | 利用2008~2014年间全国自动站观测降水和CMORPHCPC（Climate Prediction Center）morphing technique]卫星反演降水资料融合而成的0.1°×0.1°小时降水产品揭示了华北夏季降水的日变化特征，发现华北多数地区夏季降水量和降水频率日变化呈现出明显的双峰特征且存在明显的区域性差异。在太行山以西地区，降水量和降水频率的日峰值出现在傍晚18:00左右（北京时），规律性最强；而在太行山以东的平原和沿海地区，日峰值一般出现在上午。研究不同持续时间降水对总降水的贡献发现短时降水对傍晚的降水日峰值贡献较大，而长时降水则对凌晨的峰值影响更大。分析不同强度降水对总降水量的贡献结果表明，0.1~10 mm h-1强度降水较其它强度降水对夏季华北地区总降水量贡献更大，随着降水强度的增加降水量日变化的峰值个数增加。
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| 关 键 词： | 华北地区 夏季降水 日变化 气候特征 |
| 收稿时间： | 2015/11/26 0:00:00 |
Temporal and Spatial Distributions of the Diurnal Cycle of Summer Precipitation over North China |
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| HAN Han,WU Haomin and HUANG Anning.Temporal and Spatial Distributions of the Diurnal Cycle of Summer Precipitation over North China[J].Chinese Journal of Atmospheric Sciences,2017,41(2):263-274. |
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| Authors: | HAN Han WU Haomin and HUANG Anning |
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| Institution: | 1.CMA-NJU Joint Laboratory for Climate Prediction Studies, School of Atmospheric Science, Nanjing University, Nanjing 2100932.Lishui Meteorological Bureau, Zhejiang Province, Lishui 323000 |
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| Abstract: | Based on the merged hourly precipitation product at 0.1° resolution in China during 2008-2014, the diurnal variation of precipitation over North China in the summer has been revealed in this study. The precipitation data is derived from hourly precipitation observed at automatic weather stations (AWS) in China and retrievals from CMORPHCPC (Climate Prediction Center) morphing technique] satellite data. The results show that the diurnal cycles of precipitation amount and precipitation frequency over northern China in the summer have two peaks that occur in the early morning and late afternoon, respectively. Diurnal variations of precipitation over various regions with different terrains differ from each other. The diurnal cycles of precipitation amount and precipitation frequency have a single peak (two diurnal peaks) over the mountainous areas in northern Hebei and the northern part of the North China Plain (other areas). Diurnal peaks of precipitation amount and precipitation frequency both occur around 1800 BT (Beijing time) and display an obvious consistency over the areas to the west of Taihang Mountains. Over the plains and coastal areas in eastern North China, the amplitude of the morning peak is larger than that of the late afternoon peak. Analysis of the contribution of precipitation with different duration time to the total precipitation indicates that short-duration (long-duration) precipitation has a greater impact on the precipitation peak in late afternoon (morning). The precipitation with the intensity of 0.1-10 mm h-1 makes greater contribution to the total precipitation amount compared to that with the intensity over 10 mm h-1. The number of diurnal peaks increases with the increase in precipitation intensity. |
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| Keywords: | North China Summer precipitation Diurnal cycle Climatic characteristics |
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