高原气象

高原气象 >

2017 , Vol. 36 >Issue 5: 1188 - 1200

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00119

论文

青藏高原夏季降水日变化特征分析

  • 计晓龙 ,
  • 吴昊旻 ,
  • 黄安宁 ,
  • 赵卫 ,
  • 吴阳
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  • 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 210046;江苏省气候变化协同创新 中心, 南京 210046;丽水市气象局, 丽水 323000;环境保护部南京环境科学研究所, 南京 210042

收稿日期: 2015-11-16

  网络出版日期: 2017-10-28

基金资助

国家自然科学基金项目（91537102, 41175086）；江苏高校“青蓝工程”优秀青年骨干教师培养计划（0207001802）

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Characteristics of the Precipitation Diurnal Variation over Qinghai-Tibetan Plateau in Summer

  • JI Xiaolong ,
  • WU Haomin ,
  • HUANG Anning ,
  • ZHAO Wei ,
  • WU Yang
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  • China Meteorological Administration-Nanjing University(CMA-NJU) Joint Laboratory for Climate Prediction Studies, School of Atmospheric Sciences, Nanjing University, Nanjing 210046, China;Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210046, China;Lishui Meteorological Bureau, Lishui 323000, China;Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China

Received date: 2015-11-16

  Online published: 2017-10-28

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摘要

利用2008-2014年逐小时空间分辨率为0.1°的全国自动站观测降水资料和CMORPH卫星反演降水融合资料, 研究了青藏高原（下称高原）夏季降水日变化特征, 并探讨了不同持续时间和等级降水对降水量日变化的影响。结果表明, 整个高原地区夏季降水量和降水频率的日变化表现出明显的凌晨和傍晚的双峰结构, 而降水强度的双峰结构却不太明显。进一步对各分区降水日变化特征的分析发现, 高原中西部降水日变化特征与整个高原地区的一致, 而高原北部（东部）地区降水量和频率的日峰值出现在傍晚（午夜-凌晨）。降水持续时间对降水量日变化有显著的影响, 高原夏季降水量日变化的双峰特征是由短时（1~3 h）和长持续性（6 h以上）降水共同作用造成的, 午夜-凌晨（傍晚）的降水日峰值主要是由于长持续性（短时）降水所引起。分析不同等级降水量日变化特征发现, 高原北部地区小-大雨（暴雨）的降水量日峰值基本出现在下午（午夜）, 而高原中西部不同等级降水量的日变化基本都呈现出傍晚和午夜-凌晨的双峰结构, 高原东部地区不同等级降水量的日变化形式较一致, 日峰值出现在午夜-凌晨。

关键词： 青藏高原; 降水日变化; 夏季; 降水持续时间; 降水等级

本文引用格式

计晓龙 , 吴昊旻 , 黄安宁 , 赵卫 , 吴阳 . 青藏高原夏季降水日变化特征分析[J]. 高原气象, 2017 , 36(5) : 1188 -1200 . DOI: 10.7522/j.issn.1000-0534.2016.00119

Abstract

Based on the hourly emerged precipitation product with the horizontal resolution of 0.1° over China from 2008 to 2014 which was derived from the hourly precipitation observed by automatic weather stations (AWS) in China and retrieved from CMORPH satellite data, the characteristics of precipitation diurnal variations over Qinghai-Tibetan Plateau in summer had been studied.The impact of the precipitation with different duration and categories on the diurnal cycle of precipitation amount was also further revealed.Results show that the diurnal cycles of precipitation amount and frequency over the entire Qinghai-Tibetan Plateau exhibit two diurnal peaks with one in late afternoon and the other in early morning.However, the diurnal variation of the precipitation intensity shows an early morning maximum and a weaker peak at midnight.Further analysis shows that the precipitation diurnal variations over western-central Qinghai-Tibetan Plateau resemble that over the entire Qinghai-Tibetan Plateau, however, the diurnal variation of the precipitation amount and frequency over northern (eastern) Qinghai-Tibetan Plateau shows a late afternoon (midnight-early morning) maximum.In addition, the duration time of precipitation plays an important role in the diurnal cycle of precipitation amount.Diurnal variation of the summer precipitation amount over Qinghai-Tibetan Plateau showing two obvious peaks is resulted from the precipitation with both short (1~3 hours) and long (over 6 hours) duration time.The midnight-early morning (late afternoon) diurnal peak of the summer precipitation is attributed to the precipitation with long (short) duration time.Furthermore, the diurnal peak of the light to heavy (torrential) precipitation over northern Qinghai-Tibetan Plateau occurs in the afternoon (midnight).The diurnal variation of the precipitation for different categories consistently shows two peaks (one occurs in late afternoon, the other appears in midnight to early morning).Meanwhile, the diurnal variations of precipitation for different precipitation categories over eastern Qinghai-Tibetan Plateau show very similar features with a midnight-early morning maximum.

Key words： Qinghai-Tibetan Plat; Precipitation diurna; Summer; Duration time; Precipitation catego

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