Assessment of the impact of soil moisture on spring surface air temperature over the low‐latitude highlands of China

Zhao, Jingchuan; Pan, Wei; Wu, Jian; Yang, Y.

doi:10.1002/joc.6603

Cited by 7 publications

(6 citation statements)

References 66 publications

(99 reference statements)

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“…In previous studies, changes in soil moisture were investigated in different areas and habitats [61][62][63][64]. Discerning changes in soil moisture is a very complex process, as it is not only affected by the length of precipitation events [24], but also by precipitation intensity [65], vegetation type, soil texture, and other factors.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Changes in Soil Moisture Content Following Rainfall in Different Subtropical Plantations of the Yangtze River Delta Region

Liu

Tang

Cheng

et al. 2021

Water

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Rainfall is an indispensable link in the atmospheric water cycle, which plays a critical role in forest hydrology. Quercus acutissima and Cunninghamia lanceolata are two fast-growing and economically important tree species in the middle and lower reaches of the Yangtze River. They are extensively applied in the restoration of vegetation, hydraulic engineering, and the development of artificial forests. The primary aims of this study were to describe and compare the changes in soil water content following rainfall events, while elucidating their relationships to environmental factors. From September 2012 to August 2013, we monitored the soil moisture at different depths every 30 min using commercially available soil moisture measuring devices. Hourly meteorological data were monitored over an open area at 200 m from the sample site, including photosynthetically active radiation (Par), air temperature (Ta), relative air humidity (RH), vapor pressure deficits (Vpd), rainfall, and wind speed. The results revealed that variations in the soil moisture content during summer (Cv = 0.231) and autumn (Cv = 0.0.170) were greater than during spring (Cv = 0.0.092) and winter (Cv = 0.0.055), with those in the deep soil moisture (Cv = 0.117) being smaller. The soil moisture content was significantly altered following the cessation of rainfall, where the initial and average moisture content, and the ACR of the soil increased with higher rainfall intensities. The ACR was positively correlated with Ta (γ = 0.16), RH (γ = 0.46) and rainfall (γ = 0.22), but negatively correlated with Par (γ = −0.29), Vpd (γ = −0.23), and wind speed (γ = −0.01). This study provides valuable information regarding the hydrological processes of artificial forests in the middle and lower reaches of the Yangtze River.

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Section: Discussionmentioning

confidence: 99%

Comparison of Changes in Soil Moisture Content Following Rainfall in Different Subtropical Plantations of the Yangtze River Delta Region

Liu

Tang

Cheng

et al. 2021

Water

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“…Soil moisture can impact surface energy partitioning, affecting surface air temperature through land‒atmosphere coupling (Dirmeyer & Halder, 2017; Wang et al., 2011; Zeng et al., 2019). Surface flux changes can be measured by the Bowen ratio, defined as the ratio of sensible heat flux to latent heat flux (Bowen, 1926; Qin et al., 2018; Zhao et al., 2020). In general, the larger the Bowen ratio is, the more surface net radiation is allocated to sensible heat flux, contributing to an increase in surface air temperature.…”

Section: Methodsmentioning

confidence: 99%

Contributions of Local Land‒Atmosphere Coupling and Mesoscale Atmospheric Circulation to the 2013 Extreme Flash Drought and Heatwave Compound Event Over Southwest China

Fu,

Wang

2023

JGR Atmospheres

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The flash drought and heat wave compound event of the 2013 summer in Southwest China was exceptional, with profound socio‒economic impacts. Existing studies have captured the signal of this compound event; however, its causes are still poorly understood. In this study, we utilized a high‐resolution index to examine the life cycle of this compound event from 1980 to 2020 and quantified the relative contributions of land‒atmosphere coupling and mesoscale atmospheric circulation using the air parcel backward tracking method. It was found that the dry soil caused by the precipitation deficit further inhibited precipitation and caused the soil to become even drier, which then led to the development of the flash drought. The dry soil induced a substantial increase in the land‒atmosphere sensible heat flux and a rise in the near‐surface air temperature. During this process, the strength of land‒atmosphere coupling was 2.5 standard deviations higher than the mean value of the climate, playing an integral role in the near‐surface air temperature increase, accounting for 55.9% of the maximum temperature changes. The mesoscale atmospheric circulation contributed 44.1%, of which horizontal advection accounted for 41.1%, while vertical advection only accounted for 3.0%. The western Pacific subtropical high expanded westward, accompanied by the northward‐moving westerly jet stream, which prevented cold air from accessing the Southwest China, and abnormal subsidence interfered with precipitation formation. Furthermore, the control of an abnormally high‐pressure system over the region led to a decrease in cloud cover, allowing more surface incident solar radiation and contributing to the increase in the near‐surface air temperature.

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“…While in the subtropical southwest of China, soil moisture contributed 10%-50% of the total air temperature variance (J. Zhao et al, 2020). Over the monsoon-dominated region of India, the long-term decrease of soil moisture increased the incidence of temperature extremes (Ganeshi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Research has indicated that soil moisture feedback over North China contributes 6% of the total air temperature variation from 1961 to 2012 and reaches 36% after the regional warming from 1994 to 2012 (B. Xu et al, 2019). While in the subtropical southwest of China, soil moisture contributed 10%–50% of the total air temperature variance (J. Zhao et al, 2020). Over the monsoon‐dominated region of India, the long‐term decrease of soil moisture increased the incidence of temperature extremes (Ganeshi et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

Hao

Zhang

2021

Hydrological Processes

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Soil moisture plays a significant role in land‐atmosphere interactions. Changing fractions of latent and sensible heat fluxes caused by soil moisture variations can affect near‐surface air temperature, thus influencing the oasis's cooling effect in arid regions. In this study, the framework for the evaporative fraction (EF) dependence on soil moisture is used to analyse the impacts of soil moisture variation on near‐surface air temperature and the oasis effect. The result showed that soil moisture's contribution rate to EF was significantly higher than that of EF to temperature. Under the interaction of temperature sensitivity to EF and EF to soil moisture, the ∂T/∂ϴ presented a similar tempo‐spatial variation with both of the above. It was most significant in oasis areas during summer (−1.676), while it was weaker in plain desert areas during the autumn (−0.071). In the study region, the effect of soil moisture variation on air temperature can reach 0.018–0.242 K for different land‐cover types in summer. The maximum variation of soil moisture in summer can alter air temperature by up to 0.386 K. The difference in temperature variability between the oasis and desert areas promoted the formation of the oasis effect. For different oasis, the multi‐year average oasis cold effect index (OCI) ranged from −1.36 to −0.26 K. In comparison, the average summer OCI ranged from −1.38 to −0.29 K. The lower bound of the cooling effect of oasis ranged from −4.97 to −1.69 K. The analysis framework and results of this study will provide a new perspective for further research on the evolution process of the oasis effect and water–heat balance in arid areas.

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Assessment of the impact of soil moisture on spring surface air temperature over the low‐latitude highlands of China

Cited by 7 publications

References 66 publications

Comparison of Changes in Soil Moisture Content Following Rainfall in Different Subtropical Plantations of the Yangtze River Delta Region

Comparison of Changes in Soil Moisture Content Following Rainfall in Different Subtropical Plantations of the Yangtze River Delta Region

Contributions of Local Land‒Atmosphere Coupling and Mesoscale Atmospheric Circulation to the 2013 Extreme Flash Drought and Heatwave Compound Event Over Southwest China

Soil moisture influenced the variability of air temperature and oasis effect in a large inland basin of an arid region

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