| 付晓明,刘昊野,李彤彤,花家嘉,李江波.2022北京冬季奥运会冬季两项赛场山谷风现象初探[J].沙漠与绿洲气象,2021,15(5):24~29 |
| 2022北京冬季奥运会冬季两项赛场山谷风现象初探 |
| Analysis of Mountain-Valley Breeze in Biathlon Venue of 2022 Beijing Winter Olympics |
| 投稿时间：2020-04-23 修订日期：2020-08-02 |
| DOI：10.12057/j.issn.1002-0799.2021.05.004 |
| 中文关键词: 冬奥会 山谷风 气温 冷湖 预报 |
| 英文关键词:Winter Olympic Games Mountain-Valley Breeze wind direction conversion temperature forecast |
| 基金项目:唐山市科技计划项目(19150261E) |
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| 中文摘要: |
| 基于2019年1—3月张家口站探空资料与张家口市崇礼区B1638、B1640区域自动站的每小时2分钟平均风向、2分钟平均风速、整点气温及系留气艇探空资料分析第24届冬奥会冬季两项赛场的山谷风特征，为冬奥会天气预报提供参考。结果表明：环境风场较弱时，冬季两项赛场中存在山谷风现象，白天多上坡风及上谷风，夜间多下坡风及下谷风；山谷风系统一天具有两次风向的转变，下谷风转上谷风一般在日出后，而上谷风转下谷风一般在日落后；山谷风系统强度较弱，具有明显日变化，白天偏大而夜间偏小，并且受盛行西风影响明显；风向转变时，会伴随剧烈的气温升降，其原因与冷湖结构密切相关；对山谷风的预报需要综合考虑环境风场强弱、风向的转换时间、风速的分布、风向转换时气温的变化等。 |
| 英文摘要: |
| With the air sounding data from Zhangjiakou Station and the 2 minute average wind direction and speed per hour, the hourly air temperature from B1638 and B1640 automatic weather stations in Chongli district between January to March 2019, and the air sounding data from the tethered airship, the characteristics of the Mountain-Valley Breeze in the Biathlon venue of 2022 Beijing Winter Olympics are analyzed so as to provide useful information for the weather forecast of the Olympics. The research results show that the Mountain-Valley Breeze exists in the Biathlon venue with weak environmental wind field. Upslope wind and up-valley wind occur in the daytime, while they shift to downslope wind and down-valley wind at night. Within the day, the wind direction changes twice: down-valley wind turns into up-valley wind after the sunrise, while up-valley wind changes into down-valley wind after the sunset. The intensity of the Mountain-Valley Breeze system tends to be weak, with distinct diurnal variation, which intensifies during the daytime and weakens at night. The Mountain-Valley Breeze is also affected significantly by the prevailing westerly wind. The variation of the wind direction is accompanied with drastic increase or decrease of the air temperature, which is closely related to "Cold Air Lake" structure. To forecast Mountain-Valley Breeze, the intensity of the environmental wind field, the time of the wind direction conversion, the distribution of the wind speed and the air temperature variation along with the wind direction conversion have to be considered holistically. |
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