A Recent Increase in Long-Lived Heatwaves in China Under the Joint Influence of South Asia and Western North Pacific Subtropical Highs

Li, Na; Xiao, Ziniu; Zhao, Liang

doi:10.1175/jcli-d-21-0014.1

Cited by 12 publications

(17 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase in long-lived HWEs is related to the combined effect of the WPSH and SAH. These results are consistent with the conclusions of previous studies based on the analysis of HWEs in historical periods [30]. The main physical process is that when the SAH intensifies, an anomalous anticyclone occurs at the 200 hPa level over the YRB, and a downward advection of vorticity by anomalous sinking motions exists.…”

Section: Projection Of Hwessupporting

confidence: 92%

“…If a HWE occurs, HWDs are the total participating days of the HWE. Similar definition methods have also been used in previous studies on regional HWEs [30,41]. Furthermore, to distinguish HWEs of different intensities, we defined HWEs with a duration of 3-5 days as short-lived HWEs and HWEs with a duration of more than 5 days as long-lived HWEs.…”

Section: Definition Of Hwesmentioning

confidence: 99%

“…The YRB is one of the core regions for the occurrence of HWEs in China [29]. A large number of studies have focused on how HWEs in this region are generated from the perspective of large-scale circulation anomalies [29,30], variability in the sea-surface temperature (SST) [31], and anomalous boundary characteristics in observational diagnostics [32]. Li, Xiao, and Zhao [30] suggested that the occurrence of HWEs is strongly associated with the joint effects of the western-Pacific subtropical high (WPSH) and the South-Asian high (SAH).…”

Section: Introductionmentioning

confidence: 99%

“…A large number of studies have focused on how HWEs in this region are generated from the perspective of large-scale circulation anomalies [29,30], variability in the sea-surface temperature (SST) [31], and anomalous boundary characteristics in observational diagnostics [32]. Li, Xiao, and Zhao [30] suggested that the occurrence of HWEs is strongly associated with the joint effects of the western-Pacific subtropical high (WPSH) and the South-Asian high (SAH). In addition, Teng and Branstator [33] pointed out that the East-Asian jet stream (EAJS) can act as a waveguide to adjust the intensity and position of the WPSH through quasi-zonal teleconnections, which further influence the HWEs in the YRB region.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-Resolution Regional Climate Modeling and Projection of Heatwave Events over the Yangtze River Basin

Gao

Yan

2022

Sustainability

View full text Add to dashboard Cite

Heatwave events (HWEs) have strong impacts on human health, ecosystems, and sustainable social development. Using a gridded observation dataset and a high-resolution regional climate model (RCM), this study analyzed the characteristics of HWEs over the Yangtze River Basin (YRB) in eastern China during the historical period and projected the changes in HWEs over the YRB in the future. The daily maximum temperature (Tmax), long-lived (≥6 days) HWEs, and total (≥3 days) HWEs in the YRB all showed an obvious upward trend from 1981 to 2018, while the increase in short-lived (≥3 days and <6 days) HWEs was relatively moderate overall. The RCM of the Weather Research and Forecasting (WRF) model can simulate the characteristics of Tmax and HWEs in the historical period very well, and the projection results showed that Tmax, total HWEs, and long-lived HWEs will all increase obviously in both the SSP245 and SSP585 scenarios. Short-lived HWEs will also increase rapidly under SSP585, but they will rise slowly overall under SSP245. The changes in HWEs had distinct regional differences, and the intensity and coverage area of HWEs were greater under SSP585 overall. In the future, the increase in HWEs over the YRB region is likely to be associated with the enhancement of the western-Pacific subtropical high (WPSH) and South-Asian high (SAH), and this enhancement was also greater under SSP585. The results from the high-resolution simulation of the RCM can provide an important reference for disaster prevention and mitigation in the future.

show abstract

Section: Projection Of Hwessupporting

confidence: 92%

Section: Definition Of Hwesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High-Resolution Regional Climate Modeling and Projection of Heatwave Events over the Yangtze River Basin

Gao

Yan

2022

Sustainability

View full text Add to dashboard Cite

show abstract

“…Mid-high-latitude blocking highs associated with previous deceleration of the Atlantic Meridional Overturning Circulation and cold sea temperatures in the Atlantic Ocean have also been pointed out in favor of persistent hot-dry extremes (Haarsma et al, 2015;Duchez et al, 2016). A recent growth in long-lived heatwaves in China was reported because of the joint influence of the South Asia high and the WPSH (Li et al, 2021). On the other hand, remote anomalies of coupled ocean-land-atmosphere systems in distant areas also play an important role.…”

Section: Introductionmentioning

confidence: 98%

Relationship Between Summer Compound Hot and dry Extremes in China and the Snow Cover Pattern in the Preceding Winter

et al. 2022

Self Cite

View full text Add to dashboard Cite

With global warming, the probability of summer compound hot and dry extreme (CHDE) days, which are higher risk compared with single-factor extreme events, increases in some regions. However, there have been few studies on the winter precursor signals of such events. In this study, we found that summer CHDEs have generally increased in the last 20 years, with the increases in the middle and lower reaches of the Yangtze River region and Southwest China being more than double those in other regions of China. The dominant mode of summer CHDEs in China is characterized by more hot–dry days in the Yangtze–Huaihe River Basin (YHRB). Importantly, we found that there is an obvious cross-seasonal relationship between the first mode of winter snow cover in the Northern Hemisphere (NH) and summer CHDEs in China. When the mode of winter snow cover in the NH is in a positive phase with a negative-phase Arctic Oscillation (AO), i.e., more snow cover in Europe, Northeast China, and the northern United States, and less snow cover in central Asia and the midlatitudes in winter, more CHDEs in China in the following summer. Compared with the signals from the AO, these signals from winter snow can be better stored and transmitted into summer through the snow, soil and ocean, inducing a northward shift of the upper-level westerly jet and strengthening of South Asia high. Through the strong dynamic forcing of negative vorticity advection with the change of westerly jet, the subsidence movement in the western Pacific subtropical high (WPSH) region is strengthened, resulting in the stable maintenance of the WPSH in the YHRB. Under the synergy of a remote mid- and high-latitude wave train in summer, which also relates closely to winter snow cover, more CHDEs ultimately occur in the YHRB of China.

show abstract

Rising geopotential height under global warming

He,

Chen,

Collins

et al. 2024

Clim Dyn

View full text Add to dashboard Cite

Geopotential height (H) is a widely used metric for atmospheric circulation. H has been reported to be rising under global warming, but the amplitude and mechanism of this rise are not clear. Based on reanalysis datasets and climate models participating in CMIP6, this study quantitatively evaluates the sensitivity of H to global mean surface air temperature (Ts), i.e., dH/dTs. Reanalysis datasets and model simulations consistently show that dH/dTs increases monotonically with altitude in the troposphere, with a global averaged value of about 24.5 gpm/K at 500 hPa, which overwhelms the interannual H variability. Diagnosis based on the hypsometric equation shows that the rise in H is dominated by temperature-driven expansion, i.e., expansion of the air column due to warming-induced reduction of air density, while moisture-driven expansion and the surface pressure effect play only minor roles. Therefore, the magnitude of dH/dTs is determined largely by a vertical integration of the warming profile below the pressure level. Since the anthropogenic forced rise in H is rather horizontally uniform and proportional to Ts change, past and projected future changes in the global H field at each pressure level can be reproduced by change in Ts multiplied by a constant historical dH/dTs value. The spatially uniform rise in H reproduces the past and projected future expansion of the widely used H=5880 gpm contour at 500 hPa, suggesting that it does not indicate enhancement of the subtropical high but is simply caused by thermal expansion of the atmosphere.

show abstract

A Recent Increase in Long-Lived Heatwaves in China Under the Joint Influence of South Asia and Western North Pacific Subtropical Highs

Cited by 12 publications

References 40 publications

High-Resolution Regional Climate Modeling and Projection of Heatwave Events over the Yangtze River Basin

High-Resolution Regional Climate Modeling and Projection of Heatwave Events over the Yangtze River Basin

Relationship Between Summer Compound Hot and dry Extremes in China and the Snow Cover Pattern in the Preceding Winter

Rising geopotential height under global warming

Contact Info

Product

Resources

About