干旱区研究

Arid Zone Research >

2023 , Vol. 40 >Issue 12: 2031 - 2042

DOI: https://doi.org/10.13866/j.azr.2023.12.15

Ecology and Environment

Characterization of spatial and temporal changes in the oasis effect and attribution analysis of the Hexi region in the last 20 years

  • Wenbing HOU ,
  • Kaiming LI ,
  • Zhuo HUANG
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  • 1. Faculty of Geomatics, Lanzhou Jiaotong University, Lanzhou 730070, Gansu, China
    2. National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou 730070, Gansu, China
    3. Gansu Provincial Engineering Laboratory for National Geographic State Monitoring, Lanzhou 730070, Gansu, China
    4. College of Urban Environment, Lanzhou City University, Lanzhou 730070, Gansu, China

Received date: 2023-05-27

  Revised date: 2023-08-29

  Online published: 2023-12-18

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Abstract

The oasis effect is extremely important for improving the climate of arid areas and supporting the self-sustainability and development of oasis systems. In this study, taking the Hexi region of Gansu Province as the study area, the indicators of oasis effect intensity were selected using meteorological and remote sensing data. The geodetector model was adopted to reveal the spatial and temporal characteristics of the oasis effect over the past 20 years, and the influencing factors of the oasis effect intensity were analyzed qualitatively and quantitatively. The results show that (1) from 2000 to 2020, the oasis effect intensity in the study area had an increasing trend in springs, summers, and winters and a decreasing trend in autumns, and the changes in the daytime are similar to those of the corresponding seasons, but with greater intensity. The strongest was in the summer, with an increase of 1.43 ℃; at night. The changes in springs, summers, and autumns were similar to those of the corresponding seasons, but with a lower intensity, and the weak oasis warming island effect appeared in the nighttime of the autumn of 2000 and the winter of 2010; (2) the area share of strong oasis effect “cold island” is the largest in summers, and the change is small, whereas the area share of oasis “warm island” effect is the largest in winter, with a decreasing trend yearly; (3) the intensity of oasis effect in summer had a strong negative correlation with the change in vegetation cover of oasis, with a correlation coefficient of -0.917. Climate and surface factors are the major controlling factors for the intensity of the oasis effect in the Hexi region. The effect of surface albedo is the weakest, and the interaction between factors should not be neglected.

Key words： oasis effect; spatial and temporal variation; attribution; geographic probe; Hexi region

Cite this article

Wenbing HOU , Kaiming LI , Zhuo HUANG . Characterization of spatial and temporal changes in the oasis effect and attribution analysis of the Hexi region in the last 20 years[J]. Arid Zone Research, 2023 , 40(12) : 2031 -2042 . DOI: 10.13866/j.azr.2023.12.15

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