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Multiyear trends of Normalized Difference Vegetation Index and temperature in the south of Krasnoyarsk Krai |
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| Authors: | A P Shevyrnogov M Yu Chernetskiy G S Vysotskaya |
| Institution: | 1. Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia 3. Siberian Federal University, Krasnoyarsk, Russia 2. Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia |
| Abstract: | It is found that the nonlinear positive Normalized Difference Vegetation Index (NDVI) trend of mountain taiga in the south of Krasnoyarsk Krai has been negative since 1999–2000. A comparison with the boreal belt of northern Eurasia showed that, though still nonnegative, the positive trend has distinctly decreased to nearly a plateau. A trend analysis of radiation temperature of the surface revealed that the temperature shows a decreasing trend for the selected region of mountainous taiga and an increasing trend for northern Eurasia. We compared air-temperature data from the Yermakovskoe meteorological station to eliminate a preliminary data-processing error. Regression analysis demonstrated a fairly high degree of correlation. Also, we found a quite high degree of correlation between time series and trends of air temperature and NDVI. Trends in air temperature in northern Eurasia according to NCEP-DOE Reanalysis 2 data also confirm the trend found on the basis of satellite data. |
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