基于ERA5-Land产品的黄河流域蒸散时空变化特征  

Analysis on spatio-temporal variation of evapotranspiration in the Yellow River Basin based on ERA5-Land products

作　　者：杨扬[1] 王丽娟[1] 黄小燕[1] 齐月[1] 谢蕊[2] YANG Yang;WANG Lijuan;HUANG Xiaoyan;QI Yue;XIE Rui(The Institute of Arid Meteorology of CMA,Lanzhou 730020,China;Tianshui Meteorological Bureau of Gansu Province,Tianshui 741000,Gansu,China)

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃兰州730020 [2]甘肃省天水市气象局,甘肃天水741000

出　　处：《干旱气象》2023年第3期390-402,共13页Journal of Arid Meteorology

基　　金：甘肃省青年科技基金计划(20JR10RA450);国家自然科学基金项目(42105131、419751111);甘肃省气象局气象科研项目(人才专项——2122rc2x-青年优秀科技人才-09);陕西省气象局秦岭和黄土高原生态环境气象重点实验室开放研究基金项目(2022-G13)共同资助。

摘　　要：近年来,黄河流域气候发生明显变化,对流域地表水文、生态等过程产生显著影响。研究黄河流域蒸散时空变化特征,对加深陆-气相互作用认识及区域水资源管理有重要意义。本文分别在黄河源区、河套地区以及黄河下游地区选取一个代表性站点[海北、SACOL(Semi-Arid Climate and Environ⁃ment Observatory of Lanzhou University)和禹城站]的观测资料,检验欧洲中期天气预报中心ERA5-Land产品中蒸散资料在黄河流域的适用性。在此基础上,利用ERA5-Land资料中1980—2021年逐月潜热通量资料,结合经验正交函数分解(Empirical Orthogonal Function,EOF)、功率谱和回归分析研究近42 a黄河流域蒸散时空变化特征。结果表明:ERA5-Land资料能够反映海北、SACOL和禹城站蒸散变化特征,与观测资料的相关性较好,偏差和均方根误差较小,适用于黄河流域蒸散时空变化特征分析。黄河流域不同区域蒸散存在多时间尺度变化,显著振荡周期主要为5、15 a,有明显的年际和年代际变化。黄河流域不同区域年蒸散EOF分解第1模态表现出同位相变化,在2004年前后由增大转为减少趋势;第2模态为偶极子分布,空间分布表现反向变化特征。近42 a黄河流域年蒸散为明显减少趋势,不同区域减幅不同,下游减少速率最快,为-3.74 mm·a^(-1),河套地区为-2.82 mm·a^(-1),黄河源区减少速率相对平缓。夏季蒸散变率最大,河套和下游减少速率较大;冬季蒸散变率较小,黄河源区减少速率最大,为-0.48 mm·a^(-1)。The climate in the Yellow River Basin has undergone significant changes in recent years,which has a significant impact on surface hydrological and ecological processes in the basin.Studying the spatial and temporal variation of evapotranspiration in the Yellow River Basin is indicative for understanding deeply land-atmosphere interactions and regional water resources management.In this paper,the appliability of ERA5-Land evapotranspiration in the Yellow River Basin was evaluated using in-situ observations of Haibei,SACOL(Semi-Arid Climate and Environment Observatory)and Yucheng stations which are selected as representative stations from the source region,Hetao region and the lower reach of the Yellow River Basin,respectively.Then based on monthly latent heat flux from ERA5-Land data,the spatial and temporal variation of evapotranspiration in the Yellow River Basin in the past 42 years(1980-2021)are analyzed using EOF(Emipirical Orthogonal Function),power spectrum and regression analysis methods.The results show that ERA5-Land data can reflect the variation characteristics of evapotranspiration at Haibei,SACOL and Yucheng stations with good correlation and small error and root mean square deviation,which is applicable for the analysis on spatial and temporal variation of evapotranspiration in the Yellow River Basin.There are multi-timescale variations of evapotranspiration in different regions of the Yellow River Basin,with significant oscillation periods of main 5 a and 15 a,and obvious inter-annual and inter-decadal variations.The first mode in different regions of the Yellow River Basin characterizes the consistency in spatial distribution,which decreases around 2004.The second mode is dipole distribution,indicating the reverse change in space.The deceleration of evapotranspiration in the Yellow River Basin in the past 42 years is not same in different regions,with the fastest rate of-3.74 mm·a-1 in the lower reaches and-2.82 mm·a-1 in the Hetao area,while the deceleration in the source area is relatively gen

关 键 词：黄河流域不同区域 蒸散时空变化 ERA5-Land资料 

分 类 号：P426.22[天文地球—大气科学及气象学]