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Drying conditions in Switzerland-indication from a 35-year Landsat time-series analysis of vegetation water content estimates to support SDGs

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Big Earth Data 2021年第4期5卷 445-475页

作者： Charlotte Poussin Alexandrine Massot chris.ian ginzler Dominique Weber Bruno Chatenoux Pierre Lacroix Thomas Piller Liliane Nguyen Gregory Giuliani Institute for Environmental Sciences University of GenevaGenevaSwitzerland Swiss Federal Institute for Forest Snow and Landscape Research WSLBirmensdorfSwitzerland Institute for Environmental Sciences Gap Non-linearity and Climate GroupUniversity of GenevaGenevaSwitzerland

Exacerbated by climate change,Europe has experienced series of hot and dry summer since the beginning of the 21st *** importance of land conditions became an international concern with a dedicated sustainable development goal(SDG),the SDG *** calls for developing and finding innovative solu-tions to follow and evaluate impacts of changing land condi-tions induced by various driving *** Switzerland,drought risk will significantly increase in the coming decades with severe consequences on agriculture,energy production and *** this paper,we used a 35-year satellite-derived annual and seasonal times-series of normalized difference water index(NDWI)to follow vegetation water content evolution at different spatial and temporal scales across Switzerland and related them to temperature and precipitation to investigate possible responses of changing climatic *** indicate that there is a small and slow drying tendency at the country scale with a NDWI mean decreasing slope of−0.22%/year for the 23%significant pixels across *** tendency is mostly visible below 2000 m above sea level(m.a.s.l.)and in all biogeographical *** Southern Alps regions appear to be more responsive to changing drying conditions with a significant and slight negative NDWI trend(−0.39%/year)over the last 35 ***,NDWI values are mostly a func-tion of temperature at elevations below the tree line rather than *** suggest that multi-annual and seasonal NDWI can be a valuable indicator to monitor vegetation water content at different scales,but other components such as land cover type and evapotranspiration should be considered to better characterize NDWI *** Earth Observations data can provide valuable complementary obser-vations for national statistics on the ecological state of vegeta-tion to support SDG 15 to monitor land affected by drying conditions.

关键词： Climate change vegetation NDWI Landsat drought SDG 15 land degradation ecosystems Earth Observation big Earth data Switzerland

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