Changes in the spatiotemporal patterns of dry/wet abrupt alternation frequency, duration, and severity in Mainland China, 1980–2019

Qiao, Yongping; Xü, Wei; Wu, Dong; Meng, Chenna; Qin, Lianjie; Li, Zixuan; Zhan, Xuting

doi:10.1016/j.scitotenv.2022.156521

Cited by 19 publications

(9 citation statements)

References 24 publications

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“…On the one hand, summer HP can remove plenty of moisture from the air and then lead to time‐mean RH decrease (Dai et al., 2020). Because of the longer time to replenish depleted moisture in the air, dry spells after HP become longer (Li, Zwiers, et al., 2021; Qiao et al., 2022) which may further drive hot extremes by land‐atmosphere feedback and large‐scale circulation (Miralles et al., 2019). It has been detected that the sequential HP‐heatwave events have significantly increased in last 20 years across China (Y. Chen et al., 2021), which is consistent with our results.…”

Section: Resultsmentioning

confidence: 99%

Amplification of Coupled Hot‐Dry Extremes Over Eastern Monsoon China

Zhang,

Gu,

Slater

et al. 2023

Earth's Future

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High air temperatures and low atmospheric humidity can result in severe disasters such as flash droughts in regions characterized by high humidity (monsoon regions). However, it remains unclear whether responses of hot extremes to warming temperature are amplified on dry days as well as the response of dry extremes on hot days. Here, taking eastern monsoon China (EMC) as a typical monsoon region, we find a faster increase in air temperature on drier summer days, and a faster decrease in atmospheric humidity on hotter days, indicating “hotter days get drier” and “drier days get hotter” (i.e., coupling hotter and drier extremes), especially in southern EMC. The southern EMC is also a hotspot where the coupling hot‐dry extremes has become significantly stronger during the past six decades. The stronger hot‐dry coupling in southern EMC is associated with anomalies in large‐scale circulations, such as reduced total cloud cover, abnormal anticyclones in the upper atmosphere, intense descending motion, and strong moisture divergence over this region. Land‐atmosphere feedback enhance the hot‐dry coupling in southern EMC by increasing land surface dryness (seen as a decrease in the evaporation fraction). The decreasing evaporation fraction is associated with drying surface soil moisture, controlled by decreases in pre‐summer 1‐m soil moisture and summer‐mean precipitation. Given hot extremes are projected to increase and atmospheric humidity is predicted to decrease in the future, it is very likely that increasing hot‐dry days and associated disasters will be witnessed in monsoon regions, which should be mitigated against by adopting adaptive measures.

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Section: Resultsmentioning

confidence: 99%

Amplification of Coupled Hot‐Dry Extremes Over Eastern Monsoon China

Zhang,

Gu,

Slater

et al. 2023

Earth's Future

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“…Zhao, Deng, et al (2022b) and Tang et al (2021) compared the spatial and temporal patterns of precipitation and DFAA events, revealing the degree of precipitation concentration to be a key factor triggering DFAA. By detecting DFAA with SPEI, Qiao et al (2022) demonstrated the duration, intensity, return period, and temporal and spatial pattern of DFAA; and analyzed abrupt alterations in rainfall and evapotranspiration. They concluded that the imbalance In the array of "Detecting Efficiency", i.e., the efficiency of detecting DFAA events with a certain indicator, "-" means it has no reference to define its efficiency, and it is unknown whether it is higher or lower than other indicators.…”

Section: Analyzing Physical Mechanisms Of Dfaamentioning

confidence: 99%

Identification, physical mechanisms and impacts of drought–flood abrupt alternation: a review

et al. 2023

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Climate change has led to an increase in the frequency of extreme events, such as droughts and floods. This study aims to review the literature on the newly proposed phenomenon known as drought-flood abrupt alternation (DFAA). A comprehensive summary is provided to round up the numerous approaches employed to identify DFAA events, as well as its mechanisms and impacts. To provide a reference for responding and managing the emerging intensity and frequency of DFAA events, we conclude the paper by listing the insufficiency of current research and suggesting possible future research directions. As for the impact of DFAA, besides the loss of life and property which can be caused by any natural disaster, a DFAA event severely threatens food security by making a lasting and profound impact on the land productivity through the alteration of the combining conditions of water, soil, and temperature. As for the future research directions, existing indexes developed for DFAA identification should be improved by downscaling the temporal and spatial scale, with interactions of neighboring drought and flood events taken into consideration. What’s more, to better protect human society from the losses caused by DFAA, researches on accurate DFAA prediction are encouraged.

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“…Another important parameter proposed in CE publications is duration, which is basically the event span (Sedlmeier et al, 2018;Manning et al, 2019;Qiao et al, 2022). In some cases, the relation of CEs with another event (also lagged) can be indicated by analyzing the correlation.…”

Section: Frequently Analyzed Parameters Of Drought-and Heatwave-assoc...mentioning

confidence: 99%

Drought- and heatwave-associated compound extremes: A review of hotspots, variables, parameters, drivers, impacts, and analysis frameworks

Afroz

Chen²,

Anandhi³

2023

Front. Earth Sci.

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Droughts and heatwaves are rising concerns with regard to the frequent formation of the compound or concurrent extremes (CEs), which can cause greater havoc than an individual event of a higher magnitude. Recently, they have been frequently detected to form CEs together or with other events (e.g., floods, aridity, and humidity events) concurrently or with spatiotemporal lags. Therefore, this systematic review assesses these CEs by reviewing the following aspects: CE hotspots, events, and variable combinations that form CEs; frequently analyzed CE parameters (e.g., frequency and severity); large-scale modes of climate variability (CV) as drivers alongside the approaches to relate them to CEs; and CE impacts (e.g., yield loss and fire risk) alongside the impact integration approaches from 166 screened publications. Additionally, three varied analysis frameworks of CEs are summarized to highlight the different analysis components of drought- and heatwave-associated CEs, which is the novelty of this study. The analysis frameworks vary with regard to the three major assessment objectives: only CE parameters (event–event), driver association (event–driver), and impacts (event–impact). According to this review, the most frequently reported hotspots of these CEs in global studies are southern Africa, Australia, South America, and Southeast Asia. In regional studies, several vital hotspots (e.g., Iberian Peninsula, Balkans, and Mediterranean Basin) have been reported, some of which have not been mentioned in global studies because they usually report hotspots as broader regions. In addition, different event combinations (e.g., drought and heatwave; and heatwave and stagnation) are analyzed by varying the combination of variables, namely, temperature, precipitation, and their derived indices. Thus, this study presents three major analysis frameworks and components of drought- and heatwave-associated CE analysis for prospective researchers.

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Changes in the spatiotemporal patterns of dry/wet abrupt alternation frequency, duration, and severity in Mainland China, 1980–2019

Cited by 19 publications

References 24 publications

Amplification of Coupled Hot‐Dry Extremes Over Eastern Monsoon China

Amplification of Coupled Hot‐Dry Extremes Over Eastern Monsoon China

Identification, physical mechanisms and impacts of drought–flood abrupt alternation: a review

Drought- and heatwave-associated compound extremes: A review of hotspots, variables, parameters, drivers, impacts, and analysis frameworks

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