干旱气象 ›› 2023, Vol. 41 ›› Issue (5): 811-819.DOI: 10.11755/j.issn.1006-7639(2023)-05-0811

• 技术报告 • 上一篇    下一篇

CLDAS气温和降水产品在内蒙古地区适用性分析

董祝雷(), 赵艳丽(), 冯晓晶, 刘诗梦   

  1. 内蒙古自治区气候中心,内蒙古 呼和浩特 010000
  • 收稿日期:2023-02-01 修回日期:2023-08-31 出版日期:2023-10-31 发布日期:2023-11-03
  • 通讯作者: 赵艳丽(1969—),女,内蒙古满洲里人,正高级工程师,主要从事气象灾害监测、预报预警和评估及气候变化、气候应用服务等研究。E-mail: 861952609@qq.com
  • 作者简介:董祝雷(1989—),男,江苏灌云人,工程师,主要从事气候变化和气候应用服务研究。E-mail: dongzhl89@163.com
  • 基金资助:
    国家自然科学基金项目(41965003);内蒙古自治区科技重大专项(2020ZD0013);内蒙古自治区科技计划项目(2020GG0017);内蒙古自治区自然科学基金项目(2021MS04026);内蒙古自治区自然科学基金项目(2022MS04018);内蒙古自治区气象局科技创新项目(nmqxkjcx202211)

Applicability assessment of CLDAS temperature and precipitation products in Inner Mongolia

DONG Zhulei(), ZHAO Yanli(), FENG Xiaojing, LIU Shimeng   

  1. Inner Mongolia Climate Center, Hohhot 010000, China
  • Received:2023-02-01 Revised:2023-08-31 Online:2023-10-31 Published:2023-11-03

摘要:

中国气象局陆面数据同化系统(CMA Land Data Assimilation System,CLDAS)提供了高时空分辨率的陆面融合数据集,为精细化气象服务提供了重要的数据支撑,而数据的适用性评估是开展数据应用的重要基础。基于国家气象信息中心CN05.1格点观测数据和内蒙古119个国家级气象站观测资料,对CLDAS的2 m平均气温和降水产品在内蒙古地区的适用性进行检验评估,并与欧洲中期天气预报中心的ERA5(The Fifth Generation European Centre for Medium-range Weather Forecasts Re-Analysis)和英国的CRU TS(Climatic Research Unit gridded Time Series)再分析资料进行对比分析。结果表明:三种数据集均能很好地反映内蒙古年降水量和年平均气温空间分布特征,但对内蒙古大部地区降水量存在低估、平均气温存在高估现象,且CLDAS数据集还能够反映地形变化对气温和降水的影响。CLDAS和CRU TS的降水变率空间分布优于ERA5;CRU TS和ERA5的气温线性趋势与CN05.1观测结果相似,但增温率高于观测,而CLDAS气温产品还能反映局地降温趋势。无论是月尺度还是季节尺度,CLDAS数据集与站点观测值的相关系数均高于CRU TS和ERA5,平均绝对误差小于CRU TS和ERA5,CLDAS气温和降水产品误差最大的区域在河套地区。

关键词: CLDAS, 气温和降水, 适用性评估, 内蒙古

Abstract:

The CMA land data assimilation system (CLDAS) provides high spatio-temporal resolution datasets, which offers valuable data support for the fine meteorological services, while the applicability assessment of data is an important basis for its application. Based on CN05.1 gridded observation data from the National Meteorological Information Center and observation data at 119 national meteorological stations in Inner Mongolia, the applicability of 2 m mean temperature and precipitation products of CLDAS in Inner Mongolia was examined and evaluated, and was compared with ERA5 from the European Centre for Medium-range Weather Forecasts (ECMWF) and the CRU TS (Climatic Research Unit gridded Time Series) reanalysis data from the UK. The results indicate that three datasets can effectively reflect the spatial distribution characteristics of annual precipitation and annual mean temperature in Inner Mongolia, but they underestimate annual precipitation and overestimate annual mean temperature in most areas, and CLDAS datasets can also describe the influence of terrain change on temperature and precipitation. The spatial distributions of precipitation variability from CLDAS and CRU TS data are better than that from ERA5 data in Inner Mongolia. The linear trends of CRU TS and ERA5 temperature data are similar to CN05.1 observation data, but the warming rates are higher than observations, while the CLDAS temperature product shows the cooling trend in local areas of Inner Mongolia. Whether monthly or seasonal scale, the correlation coefficients between CLDAS precipitation, mean temperature and observation values at 119 stations in Inner Mongolia are higher than those of CRU TS and ERA5 data, and their average absolute errors are smaller than those of CRU TS and ERA5 data. Compared with the station observation data, the largest errors of CLDAS temperature and precipitation products appear in the Hetao region of Inner Mongolia.

Key words: CLDAS, temperature and precipitation, applicability evaluation, Inner Mongolia

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