近20 a河西地区绿洲效应时空变化特征及归因分析

doi:10.13866/j.azr.2023.12.15

Abstract

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

HOU Wenbing, LI Kaiming, HUANG Zhuo. 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.

Figures/Tables 14

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影响因素类别	影响因素	分辨率/m	数据时间	获取途径
地表因素	NDVI	1000	2020年	GEE
	ALB（反照率）	500	2020年	GEE
	GlobeLand 30	30	2000年、2010年、2020年	http://GlobeLand30
	土壤湿度	1000	2020年	http:// data.tpdc.ac.cn
空气质量因素	气溶胶光学厚度（AOD）	1000	2020年	GEE
	臭氧（O₃）	1000	2020年	GEE
气候因素	气温	1000	2020年	http:// data.tpdc.ac.cn
	降水	1000	2020年	http:// data.tpdc.ac.cn
社会经济因素	夜间灯光	1000	2020年	http:// data.tpdc.ac.cn
	人口密度	1000	2020年	https://www.worldpop.org/

绿洲效应类型	绿洲效应强度分级	分级标准
绿洲“冷岛”效应	强绿洲效应	LST_绿洲 < LST_裸地 - 8 ℃
	中强度绿洲效应	LST_裸地 - 8 ℃ ≤ LST_绿洲 < LST_裸地 - 4 ℃
	弱绿洲效应	LST_裸地 - 4 ℃ ≤ LST_绿洲 < LST_裸地
绿洲“暖岛”效应	绿洲暖岛效应	LST_绿洲 ≥ LST_裸地

季节	年份	强绿洲效应/%	中强度绿洲效应/%	弱绿洲效应/%	绿洲暖岛效应/%
春季	2000年	7.9	42.9	39.7	9.3
	2010年	10.1	25.4	51.4	12.9
	2020年	7.6	24	54.9	13.4
夏季	2000年	41.8	29.4	17	11.6
	2010年	42.4	29.4	18.1	9.9
	2020年	41.2	26.5	15.7	16.4
秋季	2000年	3.4	21.8	60	14.6
	2010年	5.3	26.5	59.9	8.2
	2020年	1.7	20.5	59.2	18.4
冬季	2000年	0.18	3.3	49.8	46.6
	2010年	0.33	4.5	50.2	44.8
	2020年	0.03	7.2	54.1	38.5

年份	土地覆盖类型面积/ km²
年份	耕地	草地	灌木地	水体	人造地表	荒漠
2000年	15170	20042	658	1151	777	358692
2010年	15670	19180	748	1121	783	359013
2020年	15835	22192	842	1270	2395	353871

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

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