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

и другие.

npj Climate and Atmospheric Science, Год журнала: 2024, Номер 7(1)

Опубликована: Ноя. 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.

Язык: 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

и другие.

Atmospheric Research, Год журнала: 2024, Номер 305, С. 107446 - 107446

Опубликована: Апрель 27, 2024

Язык: Английский

Процитировано

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

Z.J. Li,

Mu Mu, Guokun Dai

и другие.

Quarterly Journal of the Royal Meteorological Society, Год журнала: 2025, Номер unknown

Опубликована: Май 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.

Язык: Английский

Процитировано

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

и другие.

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

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

Yingying Zhong,

Quanliang Chen, Xin Zhou

и другие.

Atmospheric Research, Год журнала: 2025, Номер unknown, С. 108269 - 108269

Опубликована: Июнь 1, 2025

Язык: Английский

Процитировано

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

и другие.

Atmosphere, Год журнала: 2024, Номер 15(8), С. 893 - 893

Опубликована: Июль 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.

Язык: Английский

Процитировано

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

и другие.

npj Climate and Atmospheric Science, Год журнала: 2024, Номер 7(1)

Опубликована: Ноя. 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.

Язык: Английский

Процитировано

0