干旱区生态环境知识资源中心(Arid): 利用模拟校正法估算黄土高原半干旱区陆面蒸散发

Arid

	利用模拟校正法估算黄土高原半干旱区陆面蒸散发
其他题名	Estimation of Terrestrial Evapotranspiration of Grassland in Semi-arid Region of the Loess Plateau by Simulation-Correction Method
	杨扬; 孙旭映; 张良; 王丽娟; 胡蝶
来源期刊	水土保持研究
ISSN	1005-3409
出版年	2020
卷号	27 期号:2 页码:178-
中文摘要	研究区域气候变化及干旱监测,需要准确估算陆面蒸散发。利用兰州大学半干旱气候与环境监测站SACOL的观测资料,以CLM模式模拟的蒸散发量和MODIS观测的归一化植被指数(NDVI)为基础,构建了一种模拟校正的新方法,用于估算黄土高原半干旱区草地下垫面的蒸散发。结果表明:CLM较好地模拟了蒸散发的变化趋势,但模拟值较观测值存在较大的偏差。干旱条件下CLM模拟的蒸散发相对误差与NDVI成正比,随NDVI的增大而增大;湿润条件下,相对误差与NDVI之间满足二次曲线变化规律。经过新方法校正CLM模拟的蒸散发以后,估算的蒸散发与观测值间的偏差显著降低,平均偏差由9.71W/m~2减小到2.77W/m~2,均方根偏差由34.16W/m~2减小到8.58W/m~2,相关系数由0.67增加到0.94。模拟校正法由于考虑了植被的作用改进了黄土高原半干旱区蒸散发的估算效果。
英文摘要	In order to study regional climate change and drought monitoring,it's necessary to estimate terrestrial evapotranspiration accurately.Based on the observation data of Semi-Arid Climate Observatory and Laboratory of Lanzhou University(SACOL),the evapotranspiration simulated by Community Land Surface Model(CLM 4.0)and the normalized vegetation index(NDVI)observed by MODIS,a new method named simulation-correction was developed to estimate the terrestrial evapotranspiration over the semi-arid region of Loess Plateau.The results show that CLM can simulate the trend of terrestrial evapotranspiration well,but there are some deviations between the simulated and observed values;the relative error of simulated evapotranspiration under dry condition is proportional to NDVI,and the relative error increases with the increase of NDVI;the relationship between the relative error of simulated evapotranspiration and NDVI under wet condition follows the quadratic curve;the deviation between calculated evapotranspiration and observed values was significantly reduced after CLM simulation is corrected by the new method;compared to CLM, the MBE decreases from 9.71 W/m~2 to 2.77 W/m~2,while the RMSE decreases from 34.16 W/m~2 to 8.58 W/m~2 and correlation coefficients increase from 0.67to 0.94.Thesimulation-correction'method improves the estimation accuracy of terrestrial evapotranspiration over the semi-arid region of the Loess Plateau due to considering the vegetation.
中文关键词	蒸散发 ; 陆面过程模式 ; 归一化植被指数 ; 模拟校正法 ; 干湿环境条件
英文关键词	terrestrial evapotranspiration land surface model normalized vegetation index simulation-correction method dry and wet condition
类型	Article
语种	中文
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6713058
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/336436
作者单位	杨扬, 中国气象局兰州干旱气象研究所, 甘肃省(中国气象局)干旱气候变化与减灾重点实验室, 兰州, 甘肃 730020, 中国.; 孙旭映, 中国气象局兰州干旱气象研究所, 甘肃省(中国气象局)干旱气候变化与减灾重点实验室, 兰州, 甘肃 730020, 中国.; 张良, 中国气象局兰州干旱气象研究所, 甘肃省(中国气象局)干旱气候变化与减灾重点实验室, 兰州, 甘肃 730020, 中国.; 王丽娟, 中国气象局兰州干旱气象研究所, 甘肃省(中国气象局)干旱气候变化与减灾重点实验室, 兰州, 甘肃 730020, 中国.; 胡蝶, 中国气象局兰州干旱气象研究所, 甘肃省(中国气象局)干旱气候变化与减灾重点实验室, 兰州, 甘肃 730020, 中国.
推荐引用方式 GB/T 7714	杨扬,孙旭映,张良,等. 利用模拟校正法估算黄土高原半干旱区陆面蒸散发[J],2020,27(2):178-.
APA	杨扬,孙旭映,张良,王丽娟,&胡蝶.(2020).利用模拟校正法估算黄土高原半干旱区陆面蒸散发.水土保持研究,27(2),178-.
MLA	杨扬,et al."利用模拟校正法估算黄土高原半干旱区陆面蒸散发".水土保持研究 27.2(2020):178-.