Dynamic evolution and driving force analysis of the mass elevation effect on the Qinghai-Tibet Plateau from 2000 to 2019
The mass elevation effect(MEE)is a thermal phenomenon associated with uplifted landmasses,leading to spatial differentiation in water-heat assemblies that profoundly affect the geo-ecological pattern and environmental evolution of mountains and regions.This study developed a ground-air temperature regression model to simulate the temperature distribution on the Qinghai-Tibet Plateau using MOD11C3 data and meteorological observations,analyzing the spatiotemporal diversity and dynamic evolution of the MEE across the entire plateau and internal landform regions were estimated and analyzed from 2000 to 2019.Employing the Geodetector method,the research uncovered the genesis patterns of the MEE at different scales,revealing an average MEE of 4.13 ℃ with a pronounced centripetal pattern from northeast to southwest and decreasing elevation-dependent characteristics that were significantly negatively correlated with longitude and latitude.The average MEE of the landform regionalization was 5.06 ℃,indicating a stronger internal spatial differentiation within landform regionalization.Seasonally,the MEE was slightly stronger in the dry season,with distinct patterns of weakness in the northwest and strength in the southeast during the dry season,and the opposite in the wet season.The MEE showed an asymmetric linear enhancement pattern under global climate change,with an inclination rate of 0.26 ℃/10 a,presenting a"ring-like"characteristic of strong in the east and weak in the west and decreased from the hinterland core to the edge.The weak areas were significantly enhanced,whereas the strong areas showed small variations.The MEE fluctuation magnitude and change rate were both stronger in the dry season than in the wet season,with the dry season primarily contributing to MEE changes.The spatial and temporal patterns of the MEE were influenced by scale effects,with latitudinal zonation at the macroscale and microtopographic features at the regional level.Moreover,NDVI and barometric pressure were found to enhance the seasonal spatial variations of the MEE.This comprehensive analysis provides deep insights into the mountain science and responses to climate change.
mass elevation effectspatiotemporal differentiationlandform regionalizationGeodetectorQinghai-Tibet Plateau
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