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ISSN 1006-9895

CN 11-1768/O4

崇礼云顶冬奥赛场夜间增温事件的统计特征及其形成机制研究
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河北省气象台

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河北省技术创新引导计划项目19975414D


Statistical Characteristics and Formation Mechanisms of Night Warming Events at Chongli-Yunding Winter Olympic Stadium
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Hebei Meteorological observatory

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    摘要:

    本文利用2018年11月-2019年3月、2019年11月-2020年3月期间的自动站资料,对发生在河北崇礼云顶冬奥赛场的夜间增温事件进行了统计分析,并基于地基微波辐射、激光测风雷达、风廓线仪以及NCEP/NCAR逐6小时再分析资料探讨了夜间增温事件可能的形成机制。研究得出:云顶赛场11月到次年三月,夜间增温事件的发生概率高达76.9%,揭示了冬季夜间增温在云顶赛场是一种常见现象,同时增温次数和增温幅度均随站点海拔高度增加而减小。云顶赛场夜间增温的形成机制可归为四类,分别为风垂直切变造成的逆温层混合增温、焚风增温、整层下沉增温、中低层暖平流增温。其中第二~四类增温过程中,增温开始前谷内存在逆温时,谷底增温幅度可能会明显大于山顶,从而导致增温幅度随高度增加而减小。此外,山顶仅受第三类和第四类形成机制影响,而四类增温机制均可引发山谷增温事件,这也是增温事件发生频次随高度升高而明显减少的原因。

    Abstract:

    Based on the observation data from the automatic weather stations during November 2018–March 2019 and November 2019–March 2020 at Yunding Winter Olympic Stadium in Chongli, Hebei Province, the night warming events in the stadium are statistically analyzed in this paper, and then several types of possible formation mechanisms for these events are further discussed through the microwave radiometer, the three-dimension laser radar and the wind profiler data, and the reanalysis data from NCEP/NACR. The results show that the occurrence probability of night warming events in Yunding Stadium reaches 76.9% from November to the March next year, indicating that warming event is a common phenomenon there. The frequency and amplitude of warming decrease with the increase of the station altitude. The triggering mechanisms of night warming events in Yunding Stadium can be classified into four categories such as the mixed warming in the inversion layer caused by vertical wind shears, the foehn warming, the whole-layer sinking warming and the warm advection warming in mid and low level. During the warming process of the second to the fourth types, the warming amplitude at the bottom of the valley may be significantly larger than that at the top of the mountain when there is a temperature inversion in the valley before the start of warming, thereby the warming amplitude decreases with the increase of altitude. The warming at the top of the mountain is only affected by the third and fourth types of formation mechanisms, while all the four types can form warming events at the valley. That is why the occurrence frequency of warming events decreases with the increase of altitude.

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  • 收稿日期:2021-04-07
  • 最后修改日期:2021-07-29
  • 录用日期:2021-09-03
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