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欧空局主被动微波土壤水分融合产品在甘肃省干旱监测中的应用 被引量:15

Drought Monitoring Applications of the European Space Agency Climate Change Initiative Soil Moisture Combined Product in Gansu Province
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摘要 选取甘肃省为研究区域,利用自动土壤水分观测站(ASMS)0~10 cm土壤体积含水量数据对ESA CCI_SM(European Space Agency climate change initiative soil moisture)产品进行质量评估,并基于此产品分析长时间序列土壤体积含水量的时空变化特征,在此基础上,进一步构建土壤水分状态指数(soil moisture condition index,SMCI)应用于干旱监测。结果表明:(1)ESA CCI_SM在陇东地区与自动站土壤水分观测值的相关性最好(R=0.71),其次是陇中、陇南和甘岷地区,共有92%的站点的R通过0.01显著性检验。(2)ESA CCI_SM产品较好地呈现了西北部土壤湿度较干燥、东南部较湿润的空间分布特征。土壤体积含水量具有明显季节变化,秋季较高,其次是夏季,冬春季较低。(3)基于ESA CCI_SM产品构建的SMCI较好地监测出2002年7—10月伏秋连旱和2009年4—6月春夏连旱的发生发展过程,该数据产品在陇东和陇中雨养农业区的干旱监测应用较好。 The European Space Agency Climate Change Initiative soil moisture(ESA CCI_SM)product can provide soil volumetric water content data with high spatiotemporal coverage and a long time series.It can be used for drought monitoring on a regional scale.Gansu Province was selected as the study site for ESA CCI_SM testing.Soil volumetric water content data at the 0-10 cm depth from automatic station was used to evaluate the ESA CCI_SM product by analyzing the spatiotemporal variation characteristics of soil moisture in a long time series and construction of a soil moisture condition index(SMCI)for use in drought monitoring.The ESA CCI_SM product showed the best correlation(R=0.71)with observed values in the east of Gansu Province,followed by the middle,the south and Min county of Gansu Province.Overall,the 92%correlation coefficients of the sites were significant and passed 0.01 significant level.ESA CCI_SM indicated that it was more arid in the northwestern regions while it was more humid in the southeastern regions.Soil volumetric water content showed significant seasonal variation,which was relatively more humid in antumn,followed by summer,while in winter and spring it was drier.The SMCI constructed using the ESA CCI_SM product effectively exhibited the summer-autumn drought development from July to October 2002 and the spring-summer drought development from April to June 2009.This product had good drought monitoring capability in rain-fed agricultural areas in the middle and the east of Gansu Province.
作者 胡蝶 沙莎 王丽娟 王玮 HU Die;SHA Sha;WANG Lijuan;WANG Wei(Institute of Arid Meteorology,CMA,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key Laboratory of Arid Climate Change and Disaster Reduction of CMA,Lanzhou 730020,China)
出处 《干旱气象》 2019年第4期517-528,共12页 Journal of Arid Meteorology
基金 中国气象局农业气象保障与应用技术重点开放实验室开放研究基金项目(AMF201707) 国家自然科学基金项目(41805086) 公益性行业(气象)科研专项(重大专项)(GYHY201506001-5)共同资助
关键词 微波遥感 土壤水分 质量评估 干旱监测 microwave remote sensing soil moisture quality evaluation drought monitoring
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