Accelerating flash droughts induced by the joint influence of soil moisture depletion and atmospheric aridity

Ye, Qing; Wang, Shuo; Ancell, Brian C.; Yang, Zong‐Liang

doi:10.1038/s41467-022-28752-4

Cited by 109 publications

(73 citation statements)

References 81 publications

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“…The results show that in summer soil moisture in southern China and the United States decreases rapidly, making these regions prone to flash drought risks. This is consistent with some recent observations and analyses, which have shown increasing trends of flash drought events in humid areas in China (Wang et al, 2016;Yuan et al, 2019;Qing et al, 2022).…”

Section: Timing Of Global Drought Occurrencesupporting

confidence: 93%

Technical note: A stochastic framework for identification and evaluation of flash drought

Chen²,

Yin³

et al. 2022

Preprint

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Abstract. The rapid development of droughts, referred to as flash droughts, can pose serious impacts on agriculture, ecosystem, human health, and society. However, its definition using pentad-average soil moisture could result in low accuracy of assessing the drought occurrence, making it difficult to analyze various factors controlling the formation of flash drought. Here we used a stochastic water balance framework to quantify the timing of drought as the first passage time of soil moisture dropping from a higher level to a lower one. Based on this framework, we can theoretically examine the nonlinear relationship between the timing of drought and various hydrometeorological factors and identify possible flash drought risks caused by less rainfall (e.g., long dry spells), higher evapotranspiration (e.g., extreme heatwaves), lower soil water storage capacity (e.g., deforestation), or a combination thereof. Applying this framework to the global datasets, we found that flash drought risks also exist in humid regions such as southern China and the northeastern United States, calling for particular attention to flash drought monitoring and mitigation.

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Section: Timing Of Global Drought Occurrencesupporting

confidence: 93%

Technical note: A stochastic framework for identification and evaluation of flash drought

Chen²,

Yin³

et al. 2022

Preprint

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“…Drought stress is one of the most severe difficulties encountered by land plants; it disrupts plants’ metabolism, photosynthesis, and cell structure, thereby impairing plants’ productivity ( Pandey and Shukla, 2015 ; Chen et al., 2017 ; Qing et al., 2022 ). Recently, many studies have shown that NACs can upgrade the drought resistance of Arabidopsis, rice, wheat, and maize ( Tran et al., 2004 ; Hu et al., 2006 ; Huang et al., 2015 ; Zhu et al., 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Genome-wide characterization of NAC transcription factors in Camellia sinensis and the involvement of CsNAC28 in drought tolerance

Zhang

Lang

et al. 2022

Front. Plant Sci.

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The NAM, ATAF1/2, and CUC2 (NAC) transcription factors, which are members of a plant-specific gene family, play critical roles during the growth and development of plants and in their adaption to environmental stress. Few NAC transcription factors have been functionally characterized in tea plants (Camellia sinensis). Based on the analysis of the gene structure, motif pattern, and evolutionary relationship, we identified 104 NAC genes in C. sinensis. Among them, CsNAC28 is constitutively expressed in all organs, and most significantly, exhibiting remarkable responsiveness to abscisic acid (ABA) treatment and drought stress. ABA is a primary stress-related hormone. Recently, ABA-responsive element binding factor 2 (CsABF2) was identified in the ABA pathway of C. sinensis. However, the involvement of the CsABF2-mediated ABA pathway in regulating CsNACs was not known. Herein, a series of biochemical and genetic approaches supported the fact that CsNAC28 could potentially act as a transcription factor in the downstream of CsABF2. Furthermore, we investigated the function of CsNAC28 in the adapting of a plant to drought stress. The results showed that overexpression of CsNAC28 in Arabidopsis conferred hypersensitivity to ABA treatment and decreased the accumulation of reactive oxygen species (ROS), resulting in improved dehydration tolerance. Under conditions of drought, the expression levels of ABA pathway-related genes and drought stress‒inducible genes were greater in CsNAC28 overexpression lines than in the wild type. Our study’s comprehensive characterization of NAC genes in C. sinensis could serve as a foundation for exploring the molecular mechanism of CsNAC-mediated drought responsiveness.

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“…The short‐period increasing LE flux and stable sensible heat flux were not found in areas with dry climates such as western North America (Figure 3c) which can be due to the limited SM, leaf evaporation, and transpiration there. Additionally, there was no close linkage between DSL and heatwave in monsoon regions due to the influence of ocean‐atmosphere teleconnections (Qing et al., 2022). Specifically, even if the precipitation deficit during a DSL leads to decreasing SM and evapotranspiration, once the monsoon starts, the atmospheric humidity level tends to increase, and then the warming process was disrupted (Mo & Lettenmaier, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…The feedback between SM and air temperature during a DSL provides essential information for heatwave that follows the DSL. Furthermore, the temporal evolutions of DSLs and heatwaves provide a new angle for the understanding of the spatiotemporal variation of compound dry‐hot extremes (Alizadeh et al., 2020; Mukherjee & Mishra, 2021) and flash drought (Mo & Lettenmaier, 2016; Otkin et al., 2018; Qing et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

Lengthening Dry Spells Intensify Summer Heatwaves

Zhong

Chen

et al. 2022

Geophysical Research Letters

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A lengthening of dry spells (DSLs) has been reported by some regional studies, but its linkage with heatwaves via the feedback between soil moisture and air temperature is still not clear on the global and continental scales. Here we examine increases in the length of DSLs during summer over the global continents using in situ precipitation records. Globally, the average DSL has increased by 0.46 day/decade since the 1970s along with increased high‐pressure anomalies which are found to be an important reason for the intensification of heatwaves as suggested by the robust and widespread relationships between the DSL and heatwave duration and severity in the northern extratropics. The average DSL associated with a heatwave declined over lands, implying a strengthening coupling between precipitation anomalies and heatwaves. The findings of this study suggest that the precipitation variations associated with changes in DSLs should be considered in attributions of temperature extremes.

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Accelerating flash droughts induced by the joint influence of soil moisture depletion and atmospheric aridity

Cited by 109 publications

References 81 publications

Technical note: A stochastic framework for identification and evaluation of flash drought

Technical note: A stochastic framework for identification and evaluation of flash drought

Genome-wide characterization of NAC transcription factors in Camellia sinensis and the involvement of CsNAC28 in drought tolerance

Lengthening Dry Spells Intensify Summer Heatwaves

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