主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2023, Vol. 39 ›› Issue (6): 96-104.doi: 10.3969/j.issn.1673-503X.2023.06.012

• 论文 • 上一篇    下一篇

京藏高速呼集段道路结冰期CLDAS气温适用性及其在交通风险预警中的应用

贾晓红1,2(),李琦3,*()   

  1. 1. 内蒙古自治区气象服务中心,内蒙古呼和浩特 010051
    2. 中国气象局交通气象重点实验室,江苏南京 210008
    3. 中国气象局人工影响天气中心,北京 100081
  • 收稿日期:2023-04-17 出版日期:2023-12-28 发布日期:2024-01-27
  • 通讯作者: 李琦 E-mail:2570415607@qq.com;liqi@cma.gov.cn
  • 作者简介:贾晓红, 女, 1993年生, 工程师, 主要从事交通气象研究, E-mail: 2570415607@qq.com
  • 基金资助:
    中国气象局交通气象重点开放实验室开放研究基金(BJG202207)

Applicability of CLDAS air temperature during road icing period on Hoji section of Beijing-Tibet expressway and its application in traffic risk early warning

Xiaohong JIA1,2(),Qi LI3,*()   

  1. 1. Inner Mongolia Service Center of Meteorology, Hohhot 010051, China
    2. Key Laboratory of Transportation Meteorology, China Meteorological Administration, Nanjing 210008, China
    3. Weather Modification Center, China Meteorological Administration, Beijing 100081, China
  • Received:2023-04-17 Online:2023-12-28 Published:2024-01-27
  • Contact: Qi LI E-mail:2570415607@qq.com;liqi@cma.gov.cn

摘要:

选用2020—2022年G6京藏高速呼集段(呼和浩特至集宁)沿线26个常规气象观测站及交通气象观测站逐小时气温数据,应用平均偏差(ME)、均方根误差(RMSE)、平均绝对误差(MAE)、准确率(AR)等指标,对比分析道路结冰期高分辨率陆面融合和同化数据(CMA Land Data Assimilation System,CLDAS)的气温特征,评估呼集段沿线CLDAS气温在道路结冰方面的适用性。结果表明:G6高速呼集段结冰期CLDAS气温总体为负偏差,ME日变化为-1.2~1.4 ℃,从呼和浩特到集宁方向,20:00至次日08:00 CLDAS气温由冷偏差转向暖偏差,08:00—20:00冷偏差增大。海拔高度、坡度、坡向均对CLDAS气温精度存在影响,低海拔、平原、阳坡路段误差相对较小。经系统偏差订正的CLDAS气温ME趋近于0,各月逐时RMSE、MAE均减小0.0~0.5 ℃,AR提高0%~14%。订正后的CLDAS气温可用于气温精细化时空特征分析和道路结冰分级预警。

关键词: 高速公路, 交通气象, 气温订正

Abstract:

Hourly air temperature data from 26 conventional and traffic meteorological stations along Hoji section (from Huhhot to Jining) of Beijing-Tibet Expressway during 2020-2022 were used to compare and analyze the temperature characteristics of high-resolution land data assimilation system (CLDAS) of China Meteorological Administration using mean error (ME), root mean square error (RMSE), mean absolute error (MAE) and accuracy rate (AR) during road icing period. The results show that CLDAS air temperature along the Hoji section of the G6 expressway is generally negatively biased during the icing period with ME varying from -1.2 to 1.4 ℃ daily. From Huhhot to Jining, CLDAS temperature changes from cold bias to warm bias during 20:00 to the next day 08:00, and the cold bias increases during 08:00-20:00. Elevation, slope, and aspect have impacts on the accuracy of CLDAS temperature with relatively small errors in low-altitude, plain, and sunny slope sections. After bias correction, the ME of CLDAS temperature approaches 0, and the hourly RMSE and MAE decrease by 0.0-0.5 ℃ each month, with AR increasing by 0-14%. The bias-corrected CLDAS temperature can be used for refined spatial-temporal characteristic analysis of air temperature and classification of early warning for icy road.

Key words: Expressway, Transportation meteorology, Air temperature correction

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