Heatwave magnitude quantization and impact factors analysis over the Tibetan Plateau

npj Climate and Atmospheric Science, Год журнала: 2025, Номер 8(1)

Опубликована: Янв. 6, 2025

More frequent and intense heatwave events (HWEs) on the Tibetan Plateau (TP) present substantial threats to ecological hydrological systems. However, understanding changes in HWEs TP is limited, primarily from analyses at individual stations or single elements (glaciers, lakes). Here, using refined data, we quantify magnitude by aggregating multiple indicators into a comprehensive index explore influence of environmental factors over TP. Our findings indicate that has significantly increased since 21st century, especially autumn. From 1979–2000 2001–2022, hotspots migrated toward northwestern TP, whereas regions with most rapid increase shifted opposite direction. During inter-seasonal, spring winter, migration direction changed northwest first 22 years (1979–2000) southeast recent (2001–2022). We also find downward shortwave radiation plays significant role spatial stratified heterogeneity (SSH) magnitude, while trend temperature dominant SSH magnitude. Moreover, elevation correlated variability. The elevation-dependence become more pronounced years, high-heatwave migrating higher elevations. Furthermore, difference land cover type can affect intensity some extent. underscore patterns evolution around century provide scientific basis for interaction between different periods.

Язык: Английский

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Characteristics and Driving Mechanisms of Heatwaves in China During July and August

Atmosphere, Год журнала: 2025, Номер 16(4), С. 434 - 434

Опубликована: Апрель 8, 2025

Against the backdrop of global warming, heatwaves in China have become more frequent, posing serious risks to public health and socio-economic stability. However, existing identification methods lack precision, driving mechanisms remain unclear. This study applies Excess Heat Factor (EHF) characterize across from 2013 2023, analyzing their spatiotemporal patterns exploring key drivers such as atmospheric circulation soil moisture. Key findings reveal significant regional differences: (1) Frequency Duration—The southeastern coastal regions (e.g., Yangtze River Delta) experience higher annual heatwave frequencies (1.75–3.5 events) but shorter durations (6.5–8.5 days). In contrast, arid northwest has both frequent (1.5–3.5 events per year) prolonged (8.5–14.5 days) heatwaves, while Tibetan Plateau sees weaker events. (2) Driving Factors—Heatwaves Delta are primarily driven by an intensified subtropical high, leading subsidence clear-sky conditions. Fujian, anomalous low-level winds enhance heat accumulation, areas show strong moisture–temperature coupling, where drier soils intensify warming. Conversely, moisture a influence on Plateau, suggesting dominant control. It is important note that EHF index used this does not directly account for humidity, which may limit its applicability humid regions. Additionally, ERA5 ERA5-Land reanalysis data were systematically validated against ground observations, introducing potential uncertainties.

Язык: Английский

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Projected Heat Waves in Ecuador under Climate Change: Insights from HadGEM-RegCM4 Coupled Model

Earth, Год журнала: 2024, Номер 5(1), С. 90 - 109

Опубликована: Март 14, 2024

This study examines heat wave projections across Ecuador’s Coastal, Highlands, and Amazon regions for 1975–2004 2070–2099 under Representative Concentration Pathways (RCP) scenarios 2.6, 4.5, 8.5. Employing dynamic downscaling, we identify significant increases in heatwave intensity maximum air temperatures (Tmax), particularly RCP 8.5, with the Coastal region facing most severe impacts. A moderate positive correlation between Tmax climate indices such as Pacific Decadal Oscillation (PDO) Oceanic Niño Index (ONI) suggests regional climatic influences on trends. These findings highlight critical need integrated adaptation strategies Ecuador, focusing mitigating risks to health, agriculture, ecosystems. Proposed measures include urban forestry initiatives promotion of cool surfaces, alongside enhancing public awareness access cooling resources. research contributes understanding change impacts Latin America, underscoring urgency adopting targeted resilience against island effects centers.

Язык: Английский

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Changes in human-perceived temperature extremes and associated population exposure across China

Atmospheric Research, Год журнала: 2024, Номер unknown, С. 107896 - 107896

Опубликована: Дек. 1, 2024

Язык: Английский

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