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- W96248865 abstract "The purpose of this paper was to evaluate the effects associated with El Nino and La Nina on the growth and development of the plant cover, and their temporal evolution in the state of Rio Grande do Sul, using NOAA satellite images. Monthly rainfall data and Normalized Difference of Vegetation Index (NDVI) images were used for the period from July 1981 to June 2000. The data, classified as El Nino, La Nina and neutral, were used to make medium images, images of anomalies, and to trace graphs of the evolution of NDVI over time. Finally the relationship between rainfall and NDVI was analyzed. The results showed that part of the interannual variability of the NDVI evolution is associated to the occurrence of the EL Nino and La Nina phenomenon mainly as a consequence of the effect of this phenomenon on rainfall in the State. In the years when El Nino occurs there is increased rainfall, and consequently positive NDVI anomalies, whereas during La Nina years there is less rainfall, and this leads to predominantly negative NDVI anomalies in some periods and regions of the state. The greatest impact of the el Nino and La Nina on the NDVI occurs in November and February. The favorable and unfavorable water conditions show a lag between the increase or decrease of rainfall, and consequent increase or decrease of NDVI." @default.
- W96248865 created "2016-06-24" @default.
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- W96248865 date "2004-01-01" @default.
- W96248865 modified "2023-09-27" @default.
- W96248865 title "EFEITOS ASSOCIADOS A EL NIÑO E LA NIÑA NA VEGETAÇÃO DO ESTADO DO RIO GRANDE DO SUL, OBSERVADOS ATRAVÉS DO NDVI/NOAA" @default.
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