北京大学学报自然科学版 ›› 2021, Vol. 57 ›› Issue (6): 1006-1018.DOI: 10.13209/j.0479-8023.2021.081

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CALMET时空分辨率对CALPUFF模拟浓度场的影响

康凌1,†, 朱好2, 黄倩倩3, 刘新建4, 蔺洪涛5, 蔡旭晖1, 宋宇1, 张宏升6   

  1. 1. 北京大学环境科学与工程学院环境科学系, 北京 100871 2. 生态环境部核与辐射安全中心, 北京 100082 3. 北京城市气象研究院, 北京 100089 4. 国家核应急响应技术支持中心, 北京 100071 5. 中国核电工程有限公司, 北京 100840 6. 北京大学物理学院大气与海洋科学系, 北京 100871
  • 收稿日期:2020-10-19 修回日期:2021-01-20 出版日期:2021-11-20 发布日期:2021-11-20
  • 通讯作者: 康凌, E-mail: lkang(at)pku.edu.cn
  • 基金资助:
    国家重点研发计划(2017YFC0209904, 2017YFC0209600)资助

Impact of Temporal and Spatial Resolution of CALMET on the Simulated Concentration Fields of CALPUFF

KANG Ling1,†, ZHU Hao2, HUANG Qianqian3, LIU Xinjian4, LIN Hongtao5, CAI Xuhui1, SONG Yu1, ZHANG Hongsheng6   

  1. 1. College of Environmental Sciences and Engineering, Peking University, Beijing 100871 2. Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082 3. Institute of Urban Meteorology, CMA, Beijing 100089 4. National Nuclear Emergency Response Technical Assistance Center, Beijing 100071 5. CNNC China Nuclear Power Engineering Co., Ltd., Beijing 100840 6. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871
  • Received:2020-10-19 Revised:2021-01-20 Online:2021-11-20 Published:2021-11-20
  • Contact: KANG Ling, E-mail: lkang(at)pku.edu.cn

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摘要：

采用WRF输出的逐小时1 km分辨率预报风场作为CALMET诊断模式的输入, 生成不同时空分辨率的CALMET诊断风场, 耦合 CALPUFF得到逐分钟50 m分辨率浓度场, 在此基础上分析CALMET气象场时空分辨率对浓度场的影响, 并统计不同气象时空分辨率方案的计算耗时。结果表明, 当风向稳定且风速较大时, 较粗的时空分辨率亦能得到满意的风场和浓度场; 当风向转变且风速较小时, 时空分辨率对诊断风场和浓度场影响显著, 不同气象方案的浓度场差异可以高达40%; 风场转变期间, 当CALMET的时间步长大于30 min时, 加密气象网格会降低浓度场的模拟精度, 时间步长越长, 浓度场偏离越显著。综合考虑计算耗时和浓度场模拟准确性, 推荐在大气污染事故应急预警中采用10 min时间步长和400 m网格距的CALMET气象方案。

关键词: CALMET/CALPUFF模式系统, 时空分辨率, 风场, 浓度场, 计算耗时

Abstract:

The hourly WRF forecast wind fields with a resolution of 1 km is used as the input of the CALMET diagnostic model to generate wind fields with different temporal and spatial resolutions, which drive CALPUFF to obtain concentration fields with a resolution of 50 m per minute. The impact of the temporal and spatial resolution of CALMET meteorological fields on the concentration fields and the calculation time of each scheme are analyzed. The results show that satisfactory wind field and concentration field can be obtained even with coarse temporal and spatial resolution at stable wind direction and high wind speed conditions. The temporal and spatial resolution has a significant impact on the wind and concentration fields when the wind direction changes and the wind speed is low. The difference between concentration fields driven by various meteorological schemes can be as high as 40%. During the transition of the wind field, the accuracy of the concentration field will worsen with finer meteorological grid if the modeling time step of CALMET is greater than 30 minutes. The longer the modeling time step is, the more significant the deviation of the concentration field is. Considering the calculation time and the accuracy of the concentration field simulation, CALMET meteorological scheme with a time step of 10 min and a grid resolution of 400 m is recommended in the emergency early warning of air pollution accidents.

Key words: CALMET/CALPUFF modeling system, temporal and spatial resolution, wind field, concentration field, computational time

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