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### 大型人工湖气候效应观测研究——以密云水库为例

1. 1.中国气象局北京城市气象研究所,北京100089
2.中国地质大学环境学院大气科学系,湖北 武汉430074
3.中国气象局国家气候中心,北京100081
• 收稿日期:2016-11-01 修回日期:2017-02-19 出版日期:2017-12-20 发布日期:2017-12-20
• 作者简介:

作者简介：郑祚芳（1972-）,男,湖北荆州人,副研究员,硕士,主要从事区域气候及精细天气预报相关研究。E-mail:zfzheng@163.com

• 基金资助:
国家自然科学基金项目（41575010,41505102）、北京市自然科学基金项目（8171002）资助

### Observational Study on Climate Effect of Large Artificial Lake: Taking Miyun Reservoir as an Example

Zuofang Zheng1,2(), Guoyu Ren2,3, Yaoting Wang1, Junxia Dou1

1. 1.Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China
2.Department of Atmospheric Science, School of Environmental Studies, China University of Geosciences, Wuhan 430074,Hubei, China
3.National Climate Center, China Meteorological Administration, Beijing 100081, China
• Received:2016-11-01 Revised:2017-02-19 Online:2017-12-20 Published:2017-12-20
• Supported by:
National Natural Science Foundation of China (41575010,41505102),Beijing Natural Science Foundation of China (8171002).

Abstract:

There exists lake-land breeze that wind blowing onshore from lake to land during the day and offshore in the evening around lake area, due to differences in air pressure mainly caused by different heat capacities between lake and land. Generally speaking, the closer to the lake, the more remarkable the lake climate effects. For studying the lake climate effects, it is not only important for understanding the characteristics of local climate and atmospheric circulation, but also helpful for analyzing and forecasting meso-and micro-scale weather processes. Miyun Reservoir (MYR), which located at 15 km north of Miyun District of Beijing city, is the largest artificial lake in North China. Up to now, there are seldom reports on the influence of MYR on local weather and climate. Based on hourly observation data obtained by 77 automatic weather stations surrounding MYR from 2011 to 2015, local climate effects of MYR were explored and discussed in the present work. The results showed that: 1) comparing with peripheral plains, climate effects of MYR were characterized by the facts that lower air temperature, higher humidity, slightly weaker wind speed and larger rainfall. As far as regional climate was concerned, the MYR had a modulate effect on the local climate and the spatial extent of the effect is about 10 km. The closer to the MYR, the more notable the MYR climate effects. 2) The MYR climate effects were mainly occurred in the summer, especially for temperature and rainfall. In detail, averaged air temperature was lower of 0.96℃ and averaged rainfall amount was higher of 13.3% in MYR than in the adjacent plains, where has the same elevation with MYR away from 10km. In addition, there were significant differences in diurnal variations of meteorological factors between the south and north regions of the MYR. 3) Excluding the impact of the large-scale background wind field, local wind presented the characteristics of monthly variation, i.e., mountain breeze was dominant from April to September, especially in summer; while in other months, valley breeze was more prevailing, especially in the wintertime. In general, annual averaged local wind speed was about 0.14 m/s in the east-west direction, which was slightly larger than that of 0.10 m/s in the north-south direction around the MYR. 4) In summer, there existed significant differences in wind vectors at the south and north regions of the MYR, due to the influence of local circulation. In most time of the whole day, component anomalies were usually in the same phase, while component anomalies presented out of phase at the south and north regions of the MYR. Lake-land breeze and mountain-valley breeze had the same/opposite directions at the north/south regions of the MYR, and thus these correspondingly formed the overlaying/counteractive effects. Due to lake-land differences in heat capacities and topography effects, lake-land breeze and mountain-valley breeze in the areas around MYR usually existed at the same time, which mainly caused the differences in seasonal and diurnal variations of meteorological elements at different locations around the MYR region.

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