| 基于CLDAS的贺兰山区5—9月降水时空分布特征及其与地形的关系分析 |
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| 引用本文： | 穆建华,纪晓玲,贾乐,葛森,李晓攀,李龙燕.基于CLDAS的贺兰山区5—9月降水时空分布特征及其与地形的关系分析[J].气象科技,2023,51(6):824-834. |
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| 作者姓名： | 穆建华 纪晓玲 贾乐 葛森 李晓攀 李龙燕 |
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| 作者单位： | 1 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750002； 2 宁夏气象防灾减灾重点实验室,银川 750002； 3 宁夏气象灾害防御技术中心，银川 750002;1 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750002； 2 宁夏气象防灾减灾重点实验室,银川 750002； 4 宁夏气象台，银川 750002;1 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750002； 4 宁夏气象台，银川 750002;1 中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室，银川 750002； 3 宁夏气象灾害防御技术中心，银川 750002 |
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| 基金项目： | 国家自然科学基金(41865008)资助 |
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| 摘 要： | 利用2008—2016年5—9月中国气象局陆面数据同化系统(CLDAS)格点融合分析降水资料以及降水观测资料，在对CLDAS格点降水融合资料进行验证的基础上，对贺兰山区降水时空分布特征以及与地形的关系进行了分析。结果表明：贺兰山区降水呈“东多西少、南多北少”的分布特征，贺兰山主峰偏西0.1° 存在一个超过240 mm的降水高值中心，日降水量极值西侧高于东侧。8月降水量和短时强降水次数最多，11:00—18:00降水次数最多，午后到前半夜短时强降水次数最多。贺兰山区降水以小雨为主，其次是中雨，中雨和小雨雨量占区域总雨量的比例高达85%。贺兰山区降水量随海拔高度的增加而增加，西坡降水随高度的增加率为5.1 mm/hm，东坡降水随高度的增加率为2.1 mm/hm，西坡明显高于东坡。中雨日数与地形高度的相关性较好，其它级别降雨日数与地形相关性不强。
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| 关 键 词： | 贺兰山区 降水 时空分布 地形影响 CLDAS格点降水融合资料 |
| 收稿时间： | 2022/9/28 0:00:00 |
| 修稿时间： | 2023/8/4 0:00:00 |
Analysis of Temporal and Spatial Distribution Characteristics of Precipitation from May to September in Helan Mountains and Its Relationship with Topography Based on CLDAS Data |
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| MU Jianhu,JI Xiaoling,JIA Le,GE Sen,LI Xiaopan,LI Longyan.Analysis of Temporal and Spatial Distribution Characteristics of Precipitation from May to September in Helan Mountains and Its Relationship with Topography Based on CLDAS Data[J].Meteorological Science and Technology,2023,51(6):824-834. |
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| Authors: | MU Jianhu JI Xiaoling JIA Le GE Sen LI Xiaopan LI Longyan |
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| Institution: | 1 Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration, Yinchuan 750002; 2 Ningxia Key Laboratory of Meteorological Disaster Prevention and Reduction, Yinchuan 750002; 3 Ningxia Meteorological Disaster Defense Technology Center, Yinchuan 750002;1 Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration, Yinchuan 750002; 2 Ningxia Key Laboratory of Meteorological Disaster Prevention and Reduction, Yinchuan 750002; 4 Ningxia meteorological observatory, Yinchuan 750002;1 Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration, Yinchuan 750002; 4 Ningxia meteorological observatory, Yinchuan 750002; 1 Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions, China Meteorological Administration, Yinchuan 750002; 3 Ningxia Meteorological Disaster Defense Technology Center, Yinchuan 750002 |
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| Abstract: | Fine observation of precipitation in mountainous areas is limited by many factors. To understand the distribution characteristics of precipitation in the Helan Mountains region and its relationship with the terrain, we are applying the hourly CLDAS integrated grid precipitation data from May to September, 2008 to 2016, based on availability, evaluating and verifying, to analyse the spatial and temporal distribution characteristics of precipitation in the Helan Mountains region. The results show that: (1) The CLDAS precipitation data are basically consistent with the measured precipitation, can be applied to analyse the precipitation characteristics in the Helan Mountains region. The CLDAS precipitation data tend to underestimate precipitation when heavy rainfall events occur. (2) Precipitation in the Helan Mountains is more abundant in the eastern and southern regions and less in the western and northern regions. The maximum precipitation centre exceeding 240 mm is located at the 0.1 longitude position west from the main peak of the Helan Mountains, and the maximum daily precipitation tends to be higher in the western region than in the eastern region. (3) Most precipitation tends to occur in August, with precipitation in August accounting for 25.6% of the total precipitation from May to September, with July and September being the second and third highest months for precipitation. Short term heavy precipitation mostly occurs in August, constituting up to 56.4% of the total number of short duration heavy precipitation events from May to September. Most precipitation occurs from 11:00 to 18:00 on a daily basis, and most short term heavy precipitation occurs in the period from noon to midnight. (4) The spatial distribution of heavy and moderate rainfall days in the Helan Mountains is basically consistent with the distribution of total precipitation, indicating an overall spatial distribution of high in the east and low in the west, and high in the south and low in the north. The predominant precipitation process in the Helan Mountain is the light rain, then followed by moderate rain. The proportion of moderate rain and light rain processes accounts for 85% of the total regional precipitation processes, and the contribution of heavy rain process is significant. (5) The precipitation in the Helan Mountains tends to increase with the increase of altitude, and the precipitation increasing rate is 5.1 mm/hm in the west slope and 2.1 mm/hm in the east slope. The precipitation increasing rate along with altitude is evidently higher on the west slope than that on the east slope; the correlation between the number of moderate rain days and the terrain height is good, while the correlation between the number of rainy days at other levels and the terrain is relatively weak. |
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| Keywords: | Helan Mountain region temporal and spatial distribution precipitation topographical effect CLDAS Integrated grid precipitation data |
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