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Empirical normalization for the effect of volcanic stratospheric aerosols on AVHRR NDVI

机译:火山平流层气溶胶对AVHRR NDVI影响的经验归一化

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摘要

The 1982 El Chichon and 1991 Mount Pinatubo volcanic eruptions produced large volumes of stratospheric aerosols that affected the environmental indices estimated from the Advanced Very High Resolution Radiometer (AVHRR) sensor. As a result the Normalized Difference Vegetation Index (NDVI) used to derive several vegetation health products exhibits a negative bias between approximately 20°N and 20°S during the post eruption years. In this work a statistical method based on Empirical Distribution Functions (EDF) and simple assumptions regarding the state of global vegetation is used to reduce these biases. Results show that the statistical technique effectively reduces the biases allowing the construction of consistent time series from this historical dataset for climate studies.
机译:1982年的El Chichon和1991年的Pinatubo山火山喷发产生大量平流层气溶胶,影响了由超高分辨率高分辨率辐射计(AVHRR)传感器估算的环境指数。结果,在喷发后的几年中,用于得出几种植被保健产品的归一化植被指数(NDVI)在约20°N至20°S之间显示出负偏差。在这项工作中,使用基于经验分布函数(EDF)和有关全球植被状况的简单假设的统计方法来减少这些偏差。结果表明,统计技术有效地减少了偏差,从而允许从该历史数据集中构建一致的时间序列用于气候研究。

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