Interactive influence of ENSO and IOD on contiguous heatwaves in Australia

Environmental Research Letters, Journal Year: 2021, Volume and Issue: 17(1), P. 014004 - 014004

Published: Dec. 1, 2021

Abstract Australian heatwaves have a significant impact on society. Most previous studies focus understanding them in terms of frequency, duration, intensity, and timing. However, the spatial characteristics heatwaves, particularly those occurring contiguous regions at same time (here referred to as heatwaves), is still largely unexplored. Here, we analyse changes Australia during 1958–2020 using observational data. Our results show that extremely large are covering significantly larger areas getting longer recent period (1989/90–2019/20) compared historical (1958/59–1988/89). We also investigated association with interactions El Niño–Southern Oscillation (ENSO) Indian Ocean Dipole (IOD) multi-member ensemble physical climate model. found areal magnitude, total area, median maximum area higher (lower) strong Niño (E s ), co-occurring IOD positive -IP moderate m ) (co-occurring La Niña negative (L -IN )) seasons relative neutral (where both ENSO phase). During E , seasons, large-scale mechanisms characterised by anticyclonic highs over southeast cyclonic lows northwest Australia, favouring occurrence intensification Australia. These provide insights into driving

Language: Английский

---

Spatiotemporal Distribution of Heatwave Hazards in the Chinese Mainland for the Period 1990–2019

International Journal of Environmental Research and Public Health, Journal Year: 2023, Volume and Issue: 20(2), P. 1532 - 1532

Published: Jan. 14, 2023

Heatwaves occur frequently in summer, severely harming the natural environment and human society. While a few long-term spatiotemporal heatwave studies have been conducted China at grid scale, their shortcomings involve discrete distribution poor continuity. We used daily data from 691 meteorological stations to obtain torridity index (TI) (HWI) datasets (0.01°) order evaluate of heatwaves Chinese mainland for period 1990-2019. The results were as follows: (1) TI values rose but with fluctuations, largest increase occurring North July. areas hazard levels medium above accounted 22.16% total, mainly eastern southern provinces China, South Tibet, East Xinjiang, Chongqing. (2) study divided into four categories according hazards. "high rapidly increasing" "low continually 8.71% 41.33% respectively. (3) "ten furnaces" top provincial capitals Zhengzhou, Nanchang, Wuhan, Changsha, Shijiazhuang, Nanjing, Hangzhou, Haikou, Chongqing, Hefei. urbanization level population aging developed further increased, continuously increasing should be fully considered.

Language: Английский

---

Population Exposure Changes to Mean and Extreme Climate Events Over Pakistan and Associated Mechanisms

GeoHealth, Journal Year: 2023, Volume and Issue: 7(10)

Published: Oct. 1, 2023

The increasing prevalence of warmer trends and climate extremes exacerbate the population's exposure to urban settlements. This work investigated population changes mean extreme events in different Agro-Ecological Zones (AEZs) Pakistan associated mechanisms (1979-2020). Spatiotemporal temperatures revealed significant warming mainly over northern, northeastern, southern AEZs. In contrast, mean-to-extreme precipitation showed non-uniform patterns with a increase northeast Population (extreme) temperature increased two-fold during 2000-2020. AEZs settlements (i.e., Indus Delta, Northern Irrigated Plain, Barani/Rainfall) show maximum about 70-100 × 106 (person-days) reference period (1979-1999), which increases 140-200 person-days recent (2000-2020). addition, highest days also 40-200 2000-2020 than 1979-1999 (20-100 106) person-days. Relative are large (60%-90%) for across Pakistan, justifying spatial these zones. Overall, observed primarily attributed effect (50%) most except Plain R10 R20 events, where interaction takes lead. rapidly major could be more vulnerable due rapid urbanization growth near future.

Language: Английский

---

Exploring warm extremes in South America: insights into regional climate change projections through dry-bulb and wet-bulb temperatures

Climate Dynamics, Journal Year: 2024, Volume and Issue: 62(5), P. 4391 - 4410

Published: Feb. 9, 2024

Language: Английский

---

Changes in event soil moisture-temperature coupling can intensify very extreme heat beyond expectations

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: Jan. 16, 2025

The most disastrous heatwaves are very extreme events with return periods of hundreds years, but traditionally, climate research has focussed on moderate occurring every couple years or even several times within a year. Here, we use three Earth System Model large ensembles to assess whether heat respond differently global warming than events. We find that the signal can be amplified dampened substantially compared extremes. This modulation is detectable already in mid-century projections. In mid-latitudes, it explained by changes event soil moisture-temperature coupling during hottest day depend interplay present moisture and as well projected precipitation changes. mechanism robust across models, albeit spatial uncertainties. Our findings highly relevant for risk assessments adaptation planning.

Language: Английский

---