Investigating the Characteristics and Drivers of Slow Droughts and Flash Droughts: A Multi‐Temporal Scale Drought Identification Framework

Water Resources Research, Journal Year: 2025, Volume and Issue: 61(2)

Published: Feb. 1, 2025

Abstract Global climate change has altered the characteristics of conventional drought events, with an increasing number Slow droughts (SD) rapidly transitioning into Flash (FD). This study introduces a novel multi‐temporal scale identification framework (MTSDIF) that classifies historical agricultural events three types: SD, FD, and Slow‐to‐Flash Drought (SFD). Based on MTSDIF, GLDAS‐Noah root zone soil moisture dataset was used to analyze spatiotemporal characteristics, evolution, driving factors in China. Our confirms effectiveness proposed MTSDIF classifying different onset speeds (SD, SFD). The results indicate that, from 1980 2020, types China exhibited short‐term, medium‐term, long‐term periodic oscillations. Before 2000, SD were predominant type China, but post‐2000, areas affected by FD SFD have been continuously expanding. Compared key meteorological elements influencing show anomalies exceeding 0.5 times standard deviation. In southeastern regions human‐impacted soils, leached incept soils exhibit higher response frequency FD. Sea surface temperature indices, including interannual El Niño‐Southern Oscillation Pacific interdecadal variations such as +PDO −AMO, significantly influence occurrence monsoon ( p < 0.01). Together, highlight necessity understanding disparities consistencies land‐atmosphere‐ocean mechanisms behind varying speeds.

Language: Английский

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Duration of exposure to compound daytime-nighttime high temperatures and changes in population exposure in China under global warming

Humanities and Social Sciences Communications, Journal Year: 2024, Volume and Issue: 11(1)

Published: Aug. 22, 2024

Global warming has led to the enhancement of diurnal (daytime-nighttime) compound heat waves, which can severely affect population's physical health and productive life; this is particularly case for vulnerable populations that are more susceptible psychological physiological harm with future normalization heatwave scenarios. In study, we attributed changes in population exposure under high temperatures (HTs) extremely (EHTs) influence climatic (exposure duration) factors their combined determine relationship between duration populations. Diurnal HT EHT covered a land area 4,016,800 1,984,200 km2, respectively. The heat-exposed spread step-like all directions, centering on 24-h high-exposure strong gradient effect. prolonged shifted from Yellow-Huai-Huai Plain across geographical boundary south north middle lower reaches Yangtze River Plain. Meanwhile, average maximum value reached 186,800 93,100 person-h, values Zhengzhou, Chongqing, Wuhan, Chengdu, Beijing, other cities. Changes were dominated first by demographic then factors, dominance evident areas exposure. Under daytime-nighttime EHT, child older contribution rate 87.16% 87.43%, Therefore, suitable cooling measures should be proposed exposure, focusing mental children adults exposed EHT.

Language: Английский

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Seasonal water storage of large reservoirs exacerbates eutrophication risk in the fluctuating backwater zone: A case study of Three Gorges Reservoir, China

Ecological Indicators, Journal Year: 2025, Volume and Issue: 171, P. 113100 - 113100

Published: Jan. 23, 2025

Language: Английский

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Attribution Analysis of Water‐Sediment Nexus Changes for the Fluctuating Backwater Zone of the Three Gorges Reservoir Under Changing Environmental Conditions

River Research and Applications, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

ABSTRACT As one of the carbon neutralization or reduction strategies, constructing large hydroelectric dams leads to formation fluctuating backwater zones (FBZs). Synchronization water and sediment under impacts climatic changes human activities over FBZs is still an open question due diverse particularities zones. Taking FBZ world's largest power station, that is, Three Gorges Reservoir (TGR), as a typical example, we attempt address such in this study. Based on analyses water‐sediment characteristics, relationships, covariations, Budyko hypothesis attribution decomposition method are coupled quantitatively examine synchronization. Modeling results reveal construction cascade reservoirs dominates decrease load (e.g., 73.9% for Jialing River basin from 1985 2020), alteration runoff‐sediment relationships across FBZ. The dominator (accounting 46.01%) increasing annual average runoffs upstream wetting climate, while (64.14%) decreasing ones tributary activities; by contrast, play dominant roles (from 72.1% 98.1%) loads These findings provide scientific support addressing water‐sediment‐related issues navigational safety, deposition, environment worldwide FBZs.

Language: Английский

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Projected increase in soil erosion risk in the karst landscape of the Pearl River Basin under high carbon emission scenarios

CATENA, Journal Year: 2025, Volume and Issue: 256, P. 109065 - 109065

Published: April 25, 2025

Language: Английский

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Ecological risks linked with ecosystem services in the Upper Reach of the Yellow River under global changes

Journal of Integrative Agriculture, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 1, 2024

Language: Английский

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