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Technical Note: Comparing and ranking soil drought indices performance over Europe, through remote-sensing of vegetation

机译：技术说明：通过对植被进行遥感，比较并评估欧洲的土壤干旱指数表现

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摘要

In the past years there have been many attempts to produce and improveglobal soil-moisture datasets and drought indices. However, comparing andvalidating these various datasets is not straightforward. Here, interannualvariations in drought indices are compared to interannual changes invegetation, as captured by NDVI. By comparing the correlations of thedifferent indices with NDVI we evaluated which drought index describes mostrealistically the actual changes in vegetation. Strong correlation betweenNDVI and the drought indices were found in areas that are classified as warmtemperate climate with hot or warm dry summers. In these areas we ranked thePDSI, PSDI-SC, SPI3, and NSM indices, based on the interannual correlationwith NDVI, and found that NSM outperformed the rest. Using this bestperforming index, and the ICA (Independent Component Analysis) technique, weanalyzed the response of vegetation to temperature and soil-moisturestresses over Europe.
机译：在过去的几年中，已经进行了许多尝试来产生和改善全球土壤水分数据集和干旱指数。但是，比较和验证这些各种数据集并不容易。在这里，将干旱指数的年际变化与NDVI捕获的年际变化植被进行比较。通过比较不同指数与NDVI的相关性，我们评估了哪个干旱指数最真实地描述了植被的实际变化。在归为温带气候，夏季炎热或干燥的夏季，发现NDVI与干旱指数之间具有很强的相关性。在这些区域中，我们根据与NDVI的年际相关性对PDSI，PSDI-SC，SPI3和NSM指数进行了排名，发现NSM的表现优于其他指数。使用该最佳性能指标和ICA（独立成分分析）技术，我们分析了欧洲植被对温度和土壤湿度的响应。

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