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European urban regions are affected by explosive expansion and intensive warming, associated with the degradation of environmental and climate quality and increased health risks. By synergy use of time series MODIS Terra/Aqua satellite and observational data, this study investigated the effects of rapid urbanization in the Bucharest metropolis in Romania on climate variability at local and regional scale for 2020 to 2022 period. A complex statistical and spatial regression analysis was applied to derived satellite datasets (normalized vegetation index (NDVI), land surface albedo (LSA), and land surface temperature (LST)) together meteorological variables (air temperature at 2 m height-TA, air pressure, relative humidity, wind speed intensity and direction). Based on Spearman rank correlation analysis, this study reported the strong inverse relationship between LSA and LST during summer (June–August) in all sectors of the city (r = −0.82; p < 0.01), and strong positive correlation between air temperature and LST (r = 0.89; p < 0.01). For the metropolitan area, LSA and LST were negatively correlated (r = −0.58; p < 0.01). Our findings indicate that LST and NDVI were highly diverse correlated among the various seasons and landcovers throughout 2020–2022 period. During spring (March–May), LST-NDVI showed a high direct correlation (r = 0.88, p < 0.01 for the central part of Bucharest city, and r = 0.69; p < 0.01 for the metropolitan region). During summer season, most of the vegetation test areas presented a negative correlation with decreasing values from the outside metropolitan areas to the city center (for central city area r = −0.23, p < 0.05; for the metropolitan area r = −0.64, p < 0.01). For central city and metropolitan area of Bucharest, during autumn and winter seasons, LST was positively correlated with NDVI (r = 0.43 to r = 0.65 and p < 0.01). This study highlights the importance of urban green on its cooling effects on local and regional thermal climate of metropolitan areas during hot summer with heat waves periods.

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Spatiotemporal Changes of Urban Land Cover Impacts on the Thermal Environment in Bucharest

  • 会议论文

  • 发表日期：

    2026年

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  • Maria Zoran,
  • Roxana Savastru,
  • Dan Savastru,
  • Marina Tautan,
  • Daniel Tenciu

摘要

European urban regions are affected by explosive expansion and intensive warming, associated with the degradation of environmental and climate quality and increased health risks. By synergy use of time series MODIS Terra/Aqua satellite and observational data, this study investigated the effects of rapid urbanization in the Bucharest metropolis in Romania on climate variability at local and regional scale for 2020 to 2022 period. A complex statistical and spatial regression analysis was applied to derived satellite datasets (normalized vegetation index (NDVI), land surface albedo (LSA), and land surface temperature (LST)) together meteorological variables (air temperature at 2 m height-TA, air pressure, relative humidity, wind speed intensity and direction). Based on Spearman rank correlation analysis, this study reported the strong inverse relationship between LSA and LST during summer (June–August) in all sectors of the city (r = −0.82; p < 0.01), and strong positive correlation between air temperature and LST (r = 0.89; p < 0.01). For the metropolitan area, LSA and LST were negatively correlated (r = −0.58; p < 0.01). Our findings indicate that LST and NDVI were highly diverse correlated among the various seasons and landcovers throughout 2020–2022 period. During spring (March–May), LST-NDVI showed a high direct correlation (r = 0.88, p < 0.01 for the central part of Bucharest city, and r = 0.69; p < 0.01 for the metropolitan region). During summer season, most of the vegetation test areas presented a negative correlation with decreasing values from the outside metropolitan areas to the city center (for central city area r = −0.23, p < 0.05; for the metropolitan area r = −0.64, p < 0.01). For central city and metropolitan area of Bucharest, during autumn and winter seasons, LST was positively correlated with NDVI (r = 0.43 to r = 0.65 and p < 0.01). This study highlights the importance of urban green on its cooling effects on local and regional thermal climate of metropolitan areas during hot summer with heat waves periods.