Study of the long-term phenology changes of boreal forests in Siberia on satellite data

Eugenia V. Varlamova; Vladimir S. Solovyev

doi:10.1117/12.2575563

12 November 2020 Study of the long-term phenology changes of boreal forests in Siberia on satellite data

Eugenia V. Varlamova, Vladimir S. Solovyev

Proceedings Volume 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics; 115606Y (2020) https://doi.org/10.1117/12.2575563
Event: 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 2020, Moscow, Russian Federation

Abstract

The study of the long-term phenology changes of deciduous needle-leaved forests in Siberia (for subarctic and temperate zone) was carried out using the 15-day of NDVI time series from GIMMS3g data (1982-2015). An analysis of phenology variations of deciduous needle-leaved forests in Siberia during 1982-2015 showed the significant increase of the length of growing season on ~28/±7 days in subarctic zone and in temperate zone on ~10/±5 days. The increase of the length of growing season is due to the earlier of beginning and the later of the end of growing season. At that time, the shift of dates of the start of growing season in both zones is greater than the shift of dates of the end. Perhaps this is due to a close relationship (R<0.8) between NDVIratio and surface air temperature variations only in beginning of growing season because the correlation in the end of growing season is weak. The phenology trends of deciduous needle-leaved forests during the study period in subarctic zone is ~2–3 times higher as compared with temperate zone. For same time, there is a significant increase (~1.7°C/±0.8) of average annual air temperature in subarctic zone but the trend of temperature in temperate zone is negligible. The significant increase of the time integrated NDVI values in both zones are observed and their variations a close relation with changes of summer warmth index values: there is a high (R=0.85) correlation in subarctic zone and moderate (R=0.66) correlation in temperate zone. The trend values of the time integrated NDVI and the summer warmth index in subarctic zone are also higher as compared with temperate zone.

Citation Download Citation

Eugenia V. Varlamova and Vladimir S. Solovyev "Study of the long-term phenology changes of boreal forests in Siberia on satellite data", Proc. SPIE 11560, 26th International Symposium on Atmospheric and Ocean Optics, Atmospheric Physics, 115606Y (12 November 2020); https://doi.org/10.1117/12.2575563

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