Drought Monitoring Using the Modified Temperature/Vegetation Dryness Index

Binyong Li, Haiping Tang, Donghua Chen
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引用次数: 8

Abstract

Based on the EVI/Ts feature space which was constructed by land surface temperature (Ts) and Enhanced Vegetation Index (EVI) extracted by MODIS data, the modified temperature/vegetation drought index (MTVDI) was calculated to monitor the drought status of Inner Mongolia Autonomous Region from 9 May to 11 July. The meteorological data and soil moisture data were collected to compare with MTVDI. The correlation analysis was carried out between MTVDI and the cumulative precipitation of the same period(cpsp), the early 16 days(cpe16), the early 30 days(cpe30) and the early 60 days(cpe60). The correlationship between MTVDI and the mean temperature was analyzed in the same way. It implied that the correlation between MTVDI and the cumulative precipitation of the same period became lower and lower, which demonstrated that rainfall has a lagging effect. It depended on the cumulative precipitation in the present period whether the correlation between MTVDI and the cumulative precipitation of the same period or of the previous was significant or no. There was no significant difference in the correlations between MTVDI and the mean temperature of the same period or the previous for two periods, which were from 9 May to 24 May and from 26 June to 11 July with light drought. In heavy drought periods from 25 May to 9 June and from 10 June to 25 June, the correlation coefficient between MTVDI and the mean temperature of the same period was much higher than the previous time, which proved that the drought status was aggravated by high temperature. Finally, the soil moisture data (0-10cm) measured by agro-meteorological stations was carried out linear correlation analysis with MTVDI. The result showed that MTVDI had a close relationship with surface soil moisture and it can be used as an indicator to monitor the drought status. KeywordsMODIS; EVI; Land surface temperature; TVDI
基于修正温度/植被干旱指数的干旱监测
基于MODIS数据提取的地表温度(Ts)和增强植被指数(EVI)构建的EVI/Ts特征空间,计算修正温度/植被干旱指数(MTVDI),监测内蒙古自治区5月9日至7月11日的干旱状况。收集气象资料和土壤水分资料,与MTVDI进行比较。MTVDI与同期累积降水量(cpsp)、前16天(cpe16)、前30天(cpe30)和前60天(cpe60)进行了相关分析。用同样的方法分析了MTVDI与平均温度的相关性。这意味着MTVDI与同期累积降水的相关性越来越低,说明降水具有滞后效应。MTVDI与同期或以往累积降水量的相关性是否显著,取决于当期累积降水量。5月9日~ 5月24日和6月26日~ 7月11日两个轻度干旱期的MTVDI与同期和前期平均气温的相关性无显著差异。在5月25日~ 6月9日和6月10日~ 6月25日的重旱期,MTVDI与同期平均气温的相关系数明显高于前一次,说明高温加重了旱情。最后,利用农业气象站实测的0 ~ 10cm土壤水分数据与MTVDI进行线性相关分析。结果表明,MTVDI与地表土壤水分关系密切,可作为监测干旱状况的指标。KeywordsMODIS;增强型植被指数;地表温度;TVDI
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