黄河“几字弯”大气水分亏缺及其影响因素的时空变化特征

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Abstract The influence of solar radiation, climate, soil, and vegetation on the vapor pressure deficit (VPD), as well as the characteristics of its spatiotemporal heterogeneity under the effects of its interaction with the terrestrial-atmospheric system, were explored using spatiotemporal trend analysis, geodetector, and geographical and temporal weighted regression (GTWR) models. The results showed that the multi-year average VPD value for the Jizi Bay of the Yellow River from 1982 to 2021 was 0.785kPa, with the highest annual VPD value found in the northwestern part of the area, followed by the central and western parts. Interannual and seasonal VPD showed a significant increase in all regions (P<0.05), with the highest increase in summer VPD [0.072kPa/10a] and a high increase in mean annual VPD in the east [0.045kPa/10a]. On the interannual scale, moisture conditions (precipitation and soil moisture) had the strongest influence on VPD, followed by temperature; in the southeast, NDVI had a strong influence on VPD. Additionally, the interaction of precipitation and temperature had the strongest influence on VPD, followed by the interaction of deep soil moisture with precipitation, temperature, and vegetation indices. On the spatiotemporal scale, from the 1980s to the 2010s, the limiting effects of precipitation and vegetation indices on VPD were gradually enhanced over time from the northwest to the southeast of the region. Furthermore, the promoting effects of temperature on VPD gradually increased with time from the south to the north, while the limiting effects of deep soil moisture on VPD gradually weakened with time from the southeast to the northwest. The results of this study provide a scientific basis for revealing the process of land–atmosphere interaction in this region and promoting the ecological protection and high-quality development of the Yellow River Basin.

Key words： vapor pressure deficit (VPD) atmospheric water geodetector GTWR the Jizi Bay of the Yellow River

Received: 16 July 2024

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X51

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	HOU Ying
	HUANG Xin-hui
	CHU Yang
	LIU Wen-hui
	MA Xiao-juan

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HOU Ying,HUANG Xin-hui,CHU Yang等. Spatiotemporal variability of atmospheric moisture deficit and its influencing factors in the “Jizi Bay” of the Yellow River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(2): 637-647.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I2/637

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