Distinct tropospheric anomalies during sudden stratospheric warming events accompanied by strong and weak Ural Ridge DOI Creative Commons
Chongyang Zhang, Jiankai Zhang, Amanda C. Maycock

et al.

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: Nov. 17, 2024

Different tropospheric precursor anomalies leading to sudden stratospheric warmings (SSWs) may result in different circulation evolution. This study finds that there are distinct differences evolutions during SSWs following anomalously strong- (SUR-SSWs) and weak- (WUR-SSWs) Ural ridge. SUR-SSWs exhibit enhanced East Asian trough the week, while Greenland ridge negative annular mode can persist for 1 month. In contrast, WUR-SSWs surface cooling over northern Eurasia without notable anomalies. During SUR-SSWs, waves induced by wave source tend propagate below tropopause, amplifying trough. Additionally, due decreased phase speed, preexisting migrate westward amplify Before WUR-SSWs, Northeast Asia migrates amplifies cooling. Thus, prior significantly influence post-SSW circulation.

Language: Английский

Joint influence of the North Atlantic sea surface temperature and the barents sea-ice concentration on the dipole pattern of Eurasian surface air temperature in March DOI
Yuan Yuan, Huixin Li, Bo Sun

et al.

Atmospheric Research, Journal Year: 2024, Volume and Issue: 305, P. 107446 - 107446

Published: April 27, 2024

Language: Английский

Citations

5
Effect of stratospheric temperature perturbation on the onset of Ural blocking events in winter DOI

Z.J. Li,

Mu Mu, Guokun Dai

et al.

Quarterly Journal of the Royal Meteorological Society, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Abstract The impact of stratospheric temperature uncertainty on ural blocking (UB) onset is investigated by utilizing the Open Integrated Forecasting System model. results reveal that optimal initial perturbation obtained conditional nonlinear (CNOP) approach could obviously suppress UB onset, leading to weakening or even collapse UB. This contains multiple‐scale signals mainly located in upper stratosphere and upstream sector. Further diagnosis indicates develops causes anomalous Eliassen–Palm (E‐P) flux propagating downward into troposphere. planetary wave activity further contributes tropospheric energy divergence. Then, an enhanced meridional gradient zonal winds appear Ural its adjacent sectors. Moreover, sector dominated increased potential vorticity gradient. Eventually, weakened during phase. different scales explored. Numerical show perturbations at calculated via CNOP method clearly onset. It noted these have similar effects shows with spatial distributions tend evolve specific planetary‐scale perturbations. above are key factors explaining analogous These emphasize notable role which deepens our understanding stratosphere–troposphere coupling. contribute implementation targeted observations improve predictions.

Language: Английский

Citations

0
Impact of Preceding Arctic Oscillation Anomaly on the Zonal Displacement of the South Asian High in July DOI
Jiakang Duan, Ji‐Lin Zhou, Ruixiang Zhang

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Influence of tropopause folds on an extreme low temperature event in Eastern China in January 2021 DOI

Yingying Zhong,

Quanliang Chen, Xin Zhou

et al.

Atmospheric Research, Journal Year: 2025, Volume and Issue: unknown, P. 108269 - 108269

Published: June 1, 2025

Language: Английский

Citations

0
Analysis of Extreme Cold Events of December 2022 and January 2024 in the United States DOI Creative Commons
Song Yang, H. Z. Cui, Changshui Xia

et al.

Atmosphere, Journal Year: 2024, Volume and Issue: 15(8), P. 893 - 893

Published: July 26, 2024

In December 2022, the United States (US) experienced an extreme cold event. Its duration was 5 days, and it ranked third in intensity (−9.16 °C) during period from 1979 to 2022. During Early Stage (12–16 December), surface air temperature (SAT) anomaly peaked at 2.98 °C. Development (17–21 moved towards North America (NA). This event reached its peak Outbreak (22–26 with a minimum SAT of −9.16 Concurrently, high pressure occurred Alaska Archipelago region, while low-pressure centers US. The U-component wind (U-wind) negative northern part NA. V-component (V-wind) southward. These atmospheric structural changes facilitated southward movement Arctic Furthermore, positive (negative) U-wind observed obstruct (promote) progression A linear regression analysis indicated that Oscillation (AO) correlated accumulation Arctic, High led transport empirical orthogonal function (EOF) analysis, EOF1 (16.3%) characterized by warm NA pattern, reflecting region moving into NA, EOF2 (14.4%) depicted characterizing outbreak events January 2024, US another maximum −9.50 °C, 8 days. course two very similar.

Language: Английский

Citations

1
Distinct tropospheric anomalies during sudden stratospheric warming events accompanied by strong and weak Ural Ridge DOI Creative Commons
Chongyang Zhang, Jiankai Zhang, Amanda C. Maycock

et al.

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: Nov. 17, 2024

Different tropospheric precursor anomalies leading to sudden stratospheric warmings (SSWs) may result in different circulation evolution. This study finds that there are distinct differences evolutions during SSWs following anomalously strong- (SUR-SSWs) and weak- (WUR-SSWs) Ural ridge. SUR-SSWs exhibit enhanced East Asian trough the week, while Greenland ridge negative annular mode can persist for 1 month. In contrast, WUR-SSWs surface cooling over northern Eurasia without notable anomalies. During SUR-SSWs, waves induced by wave source tend propagate below tropopause, amplifying trough. Additionally, due decreased phase speed, preexisting migrate westward amplify Before WUR-SSWs, Northeast Asia migrates amplifies cooling. Thus, prior significantly influence post-SSW circulation.

Language: Английский

Citations

0