摘要
利用1981—2019年呼伦贝尔地区16个气象站观测数据,结合相关系数、均方根误差、散点斜率等方法,对ERA5-Land和MERRA2再分析月气温、降水数据的区域适用性进行评估。研究表明:ERA5-Land、MERRA2两套再分析气温、降水数据与观测数据对比,整体相关性较高、误差较低、本地适用性较高,但均存在低观测值时再分析数据的高估和高观测值时再分析数据的低估现象。ERA5-Land的月气温数据略优于MERRA2,月降水数据差于MERRA2。ERA5-Land的年降水量在2005年之后出现明显的低估,降水量被低估的月份主要为6—8月,在再分析数据使用前应对其进行系统偏差订正,以提高数据的适用性。
Based on the observed data of 16 meteorological stations in Hulun Buir from 1981 to 2019,combining statistical approach,the regional applicability of ERA5-Land and MERRA2 reanalysis data including monthly temperature and precipitation were assessed.The results showed that reanalysis temperature and precipitation data of ERA5-Land and MERRA2 had a high relativity,low error and high applicability,comparing with observed data.However,underestimation and overestimation were also found for reanalysis data.The monthly temperature data of ERA5-Land was better than MERRA2,while the monthly precipitation data was reversed.In addition,the annual precipitation of ERA5-Land was obviously underestimated after 2005,which mainly appeared from June to August.Therefore,the corrections of systematic deviation were needed before using the reanalysis data to improve its applicability.
作者
曲学斌
林聪
辛孝飞
敖孟奇
乌尼尔
王彦平
QU Xuebin;LIN Cong;XIN Xiaofei;AO Mengqi;WU Nier;WANG Yanping(Hulun Buir Meteorological Bureau,Hulun Buir 021008,China;Hulun Buir Agriculture and Animal Husbandry Bureau,Hulun Buir 021008,China)
出处
《沙漠与绿洲气象》
2022年第5期24-30,共7页
Desert and Oasis Meteorology
基金
内蒙古自治区气象局创新项目(nmqxkjcx202102)
中国气象局气候变化专项(CCSF202025)。
