doi:  10.3878/j.issn.1006-9895.1907.18256
2008-2016年重庆地区降水时空分布特征

Temporal and Spatial Distributions of PrecipitationIn Chongqing during 2008-2016
摘要点击 115  全文点击 26  投稿时间:2018-11-13  修订日期:2019-06-28
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基金:  
中文关键词:  重庆  降水 短时强降水  气候特征
英文关键词:  Chongqing, Precipitation, Short-term  heavy rainfall, Climate  characteristics
                    
作者中文名作者英文名单位
方德贤Fang Dexian重庆市渝北区气象局
董新宁Dong Xinning重庆市气候中心
邓承之重庆市气象台
吴钲重庆市气象科学研究所
高松重庆市气象科学研究所
海川
黄安宁
引用:方德贤,董新宁,邓承之,吴钲,高松,海川,黄安宁.2020.2008-2016年重庆地区降水时空分布特征[J].大气科学
Citation:Fang Dexian,Dong Xinning.2020.Temporal and Spatial Distributions of PrecipitationIn Chongqing during 2008-2016[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      利用2008-2016年国家气象信息中心提供的逐小时0.1°分辨率的卫星融合降水资料,分析了重庆地区的降水时空分布特征,尤其是小时强降水的时空分布特征。结果表明:(1)年均降水量总体呈西低东高分布,大值中心位于重庆东北和东南部,且存在一定的季节性差异,特别是夏季,西部降水明显增强,总降水呈两高(西部、东部)一低(中部)的分布;降水频次、降水强度与地形的相关性较高,海拔高度较高的山区(海拔高度>1000m)降水频次多大于盆地和丘陵区(海拔高度<1000m),降水强度与之相反,且小时强降水多发生在迎风坡前侧的过渡区域,说明高海拔区域易出现降水,但降水强度不强,而地形抬升则是触发强降水的重要原因,导致山前降水明显大于山峰。(2)重庆地区降水主要集中在5-9月,降水量、降水强度和小时强降水频次均呈单峰型分布,峰值出现在6-7月,降水频率呈双峰型分布,一个峰值出现在5-6月,另一个峰值出现在10月,7-8月为低频期,与副高控制下的连晴高温天气有关。(3)重庆地区降水存在明显的日变化特征,降水以夜雨为主,且降水峰值出现时间表现为向东延迟的特征:西部峰值出现在凌晨02:00,中部为05:00,东部山区则为早上08:00;春季、秋季和冬季降水日变化呈单峰型分布,主要集中在凌晨,而夏季受午后局地对流性天气的影响,在下午17:00左右存在一个次峰值。
Abstract:
      The spatial and temporal distribution characteristics of precipitation in Chongqing area, especially the spatial and temporal distribution characteristics of hourly heavy precipitation, were analyzed by using the 0.1 degree resolution satellite fusion precipitation data provided by the National Meteorological Information Center from 2008 to 2016. The results show that: (1) the annual average precipitation is generally low in the West and high in the east, and the large value centers are located in the northeast and southeast of Chongqing, and there is a certain seasonal difference. Especially in summer, the precipitation in the west is significantly increased, and the total precipitation is two high (west, east) and one low (middle) distribution; precipitation frequency, precipitation intensity and topography. The frequency of precipitation in the lower and middle mountain areas with higher altitude (altitude > 1000m) is more than that in the basin and hilly areas (altitude < 1000m). The intensity of precipitation is contrary to it, and the hourly heavy precipitation mainly occurs in the transition area in front of the windward slope, which indicates that precipitation is easy to occur in the high altitude area, but the intensity of precipitation is higher. It is not strong, and the uplift of terrain is an important reason for triggering heavy precipitation, leading to precipitation in front of the mountains is significantly greater than in the mountains. (2) The precipitation in Chongqing is mainly concentrated in May-September. The precipitation, precipitation intensity and hourly heavy precipitation frequency are all single-peak distribution. The peak value appears in June-July, and the precipitation frequency is bimodal distribution. One peak value appears in May-June, the other peak value appears in October, July-August is low-frequency period, and the sunny and high-temperature days under the control of the subtropical high. Gas is related. (3) There are obvious diurnal variation characteristics of precipitation in Chongqing area. The precipitation is mainly night rain, and the time of peak precipitation appears eastward delay. The peak precipitation appears in the west at 02:00 am, in the middle at 05:00 am, in the east at 08:00 am. The diurnal variation of precipitation in spring, autumn and winter shows a single peak distribution, mainly concentrated. In the early morning and summer, there is a sub-peak at about 17:00 PM due to the local convective weather in the afternoon.
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