Quantifying the Teleconnections Between East Asian Winter Precipitation and Tropical Sea Surface Temperatures Using Causal Analysis

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(5)

Опубликована: Фев. 28, 2025

Abstract It was previously revealed that winter precipitation in East Asia is linked to tropical Sea Surface Temperature (SST) anomalies the Indian and Pacific Oceans. While several teleconnection pathways have been identified, accurately measuring these connections determining relative contributions of SSTs remains a challenge. We employed novel causal inference approach quantify effects on Asian precipitation, focusing its leading mode (denoted as Pr). Using PCMCI method, we first derived graph between Pr eastern/western Ocean EP, WP, IO respectively). Based graph, then applied quantitative analysis using Wright's path method. The results indicated WP‐SST had most substantial impact Pr, with 1 Standard Deviation (SD) increase 0.24 SD decrease at 1‐month lag 0.17 2‐month lag. monsoon winds subtropical jet stream are identified critical mediators this effect. Additionally, EP‐SST notable positive influence warming 0.12 lag, while IO‐SST exhibits minor essential note that, traditional regression indicates explained largest portion variance among three SSTs, but exerts more significant role driving variations, aligning numerical experiments.

Язык: Английский

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Synergistic effect of El Niño Southern oscillation and subtropical Indian Ocean Dipole on Southern China winter precipitation

Atmospheric Research, Год журнала: 2023, Номер 293, С. 106928 - 106928

Опубликована: Июль 16, 2023

Язык: Английский

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Interannual Variations in Winter Precipitation in Northern East Asia

Water, Год журнала: 2025, Номер 17(2), С. 219 - 219

Опубликована: Янв. 15, 2025

Winter precipitation (P) in East Asia (EA) is characterized by a wetter south and drier north. Most of the existing research has concentrated on elucidating mechanisms winter P southern EA, with relatively less attention given to northern (NEA). Our analysis showed that correlation coefficient (c.c.) average anomaly percentage (PAP) between EA NEA 0.24 for period 1950–2023, indicating substantial regional difference. An empirical orthogonal function (EOF) was conducted PAP NEA. The first second mode (EOF1 EOF2) account 45.5% 17.9% total variance, respectively. EOF1 region-wide uniform spatial pattern whereas EOF2 exhibits north–south dipole pattern. Further indicated two EOF modes are related distinct atmospheric circulation external forcings. Specifically, linked wave train from Central Siberia toward Japan, while connected an similar Western Pacific Variations mid–high latitude sea surface temperatures, ice, snow potential factors influencing EOF1. close relationship tropical SST anomalies.

Язык: Английский

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Key Role of Arctic Sea‐Ice in Subseasonal Reversal of Early and Late Winter PM _2.5 Concentration Anomalies Over the North China Plain

Geophysical Research Letters, Год журнала: 2023, Номер 50(4)

Опубликована: Фев. 24, 2023

Abstract The PM 2.5 (fine particulate matter with diameter ≤2.5 μm) concentration anomalies over the North China Plain (NCP) in early and late winter sometimes show a subseasonal reversal, which brings great challenge for precise control of air pollution, mechanisms are not well understood. This paper reveals key role Barents Sea sea‐ice this reversal. In winter, negative Scandinavian‐like pattern causes an anticyclonic anomaly Northeast Asia thus leads to positive NCP. addition, anomalous warm advection associated Atlantic Oscillation‐like accelerates loss Sea, especially increases surface turbulent heating flux. These Polar/Eurasian‐like that induces cyclonic eventually NCP winter. Vice versa.

Язык: Английский

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Influence of rainfall-induced diabatic heating on southern rainfall-northern haze over eastern China in early February 2023

Science China Earth Sciences, Год журнала: 2023, Номер 66(11), С. 2579 - 2593

Опубликована: Окт. 12, 2023

Язык: Английский

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Role of the Boreal Autumn Antarctic Oscillation in Controlling the Winter Frequency of Severe Pollution Events in the Beijing–Tianjin–Hebei Region, China

Journal of Geophysical Research Atmospheres, Год журнала: 2024, Номер 129(14)

Опубликована: Июль 18, 2024

Abstract The Antarctic Oscillation (AAO), which is the main mode of extratropical circulation in Southern Hemisphere, also has a substantial effect on Northern Hemisphere climate. We investigated influence early AAO frequency late severe pollution events (SPEF) Beijing–Tianjin–Hebei region (SPEF BTH ) China during winter. results show that winter (December–January–February) SPEF negatively correlated with from previous autumn (August–September–October). controlling mechanism can be briefly described as follows: positively mid‐latitude sea surface temperature (SST) South Atlantic Ocean. SST preserves anomaly signal into following This anomalous regulates changes tropical western Indian Ocean–Intertropical Convergence Zone (IN–ITCZ) via air–sea coupling. Subsequently, response to IN–ITCZ anomalies, wave trains are excited upper troposphere Ocean East Asia. In addition, local meridional modulated; therefore, field and other meteorological elements favorable for appear exacerbate . study describes new physical pathway subsequent finds predictable source system.

Язык: Английский

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Synergistic effects of El Niño and the Aleutian Low on spring zonal displacement of WNPSH and associated near-surface temperatures over the Indochina Peninsula

Climate Dynamics, Год журнала: 2024, Номер unknown

Опубликована: Авг. 30, 2024

Язык: Английский

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降雨非绝热加热对2023年2月上旬中国东部“南雨-北霾”事件的影响

SCIENTIA SINICA Terrae, Год журнала: 2023, Номер 53(11), С. 2623 - 2638

Опубликована: Сен. 4, 2023

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