摘要
利用2001-2014年MOD16蒸散产品数据、MOD13植被NDVI数据以及常规气象资料,基于植被指数、地表净辐射、气温优化改进混合型线性双源遥感蒸散模型,拟合地表蒸散分析实际蒸散(ET)、潜在蒸散(PET)时空动态变化特征,结合气象站实测蒸发皿数据验证MOD16数据在绿洲地区的适用性。进一步定义蒸散干旱指数(EDI)并计算△EDI进行研究区干旱特征分析,为大面积特殊地形蒸散估算研究和干旱监测提供一定依据。结果表明:(1) MOD16产品数据与研究区实测蒸发皿数据的相关性很好,通过0.01显著性检验,基于MOD16数据估算南疆绿洲地区蒸散量检验可行。(2) 2001-2014年均蒸散量总体变化不大,四季差异明显,ET与PET空间变化趋势相反;ET、PET年均差值较大,绿洲地区地表缺水情况严重。(3)EDI指数绿洲地区年均值总体偏大,△EDI对旱情的反映和干旱程度的判断比较可靠。
Evapotranspiration is estimated based on NDVI,surface net radiation,air temperature by using China monthly meteorological data and MODIS remote sensing data which include evapotranspiration data(MOD16) and normalized difference vegetation index data(MOD13).Simplify and improve the parameters of mixed linear dual source remote sensing evapotranspiration model to estimate the surface evapotranspiration in oasis region of southern Xinjiang,China.Analysis of spatial and temporal variation characteristics of the actual-evapotranspiration(ET) and potential-evapotranspiration(PET) from 2001 to 2014.Besides,based on the correlation analysis of measured evaporation data from meteorological stations in southern Xinjiang,the applicability of MOD16 products in oasis region is already credible by means of statistical test.According to the evapotranspiration drought index(EDI),the distribution characteristics of drought in oasis of southern Xinjiang is analyzed,and the degree of drought is determined by the EDI anomaly.The results reflect that the annual mean evapotranspiration from 2001 to 2014 shows little change,and these are significant difference among the four seasons.The highest evapotranspiration is in summer and the lowest in winter.The spatial trend of ET and PET is in opposite situation.In addition,there is a huge disparity between the annual value of ET and PET which means the surface water shortage is serious in oasis.Furthermore,the average annual value of EDI index in oasis area is fairly large,the response of EDI anomaly to drought and the judgment of drought degree are reliable.From the perspective of energy and water-balance,this research simplifies the model parameters and enhances the applicability of the model.It has certain guiding significance for large scale areas evapotranspiration estimation and drought monitoring.
作者
高瑜莲
柳锦宝
柳维扬
于静
刘志红
GAO Yu-lian;LIU Jin-bao;LIU Wei-yang;YU Jing;LIU Zhi-hong(Chengdu University of Information Technology, Chengdu 610225 , Sichuan, China;Institute of Plant Science and Technology, Tarim University Aral 843300, Xinjiang, China;Inner Mongolia Tongliao Meteorological Bureau, Tongliao 028000 y Inner Mongolia, China)
出处
《干旱区地理》
CSCD
北大核心
2019年第4期830-837,共8页
Arid Land Geography
基金
塔里木大学现代农业工程重点实验室开放课题(TDNG20150504)
四川省教育厅重点项目(14ZA0164)
四川省科技支撑计划项目(2015NZ0034)
干旱气象科学研究基金(IAM201402)
国家自然科学基金项目(41561068)
关键词
新疆南疆
绿洲
地表蒸散
蒸散干旱指数(EDI)
时空变化特征
southern Xinjiang
oasis
surface evapotranspiration
evapotranspiration drought index(EDI)
spatial and temporal variation characteristics
