Potential remote forcing of North Atlantic SST tripole anomalies on the seesaw haze intensity between late winter months in the North China plain: A case study DOI Creative Commons
Jing Wang, Yanju Liu, Yihui Ding

и другие.

Atmospheric Science Letters, Год журнала: 2023, Номер 24(9)

Опубликована: Апрель 26, 2023

Abstract This study identified a prominent temporal seesaw haze intensity case that occurred between the late winter months of 2010 in North China Plain (NCP), featuring considerably suppressed January and enhanced adjacent month February 2011. We suggest dramatic alternations atmospheric oceanic anomalies played fundamental roles forming this case, rather than changes manmade emission anomalies. The 2011 was tied to an equivalent barotropic cyclonic anomaly dominated NCP its surroundings, which generated situ haze‐suppressed meteorology characterized by strengthened lower‐level northerly with cold dry conditions, as well elevated boundary layer height destabilized stratification. In stark contrast, connected anticyclonic anomaly, linking haze‐favourable opposite pronounced Atlantic sea surface temperature (SST) tripole anomalies, positive tropical mid‐latitudinal negative subtropical Atlantic, made significant contribution above‐mentioned case. Diagnostic analyses suggested SST were linked Oscillation (NAO)‐like pattern, acted source Rossby wave train generate concurrent over NCP. February, although NAO‐like pattern drastically dampened, centred southeast Yamal Peninsula critical role relaying impact thus inducing meteorology. Consequently, could exert effective modulation effect on generation intensity. proposed mechanism further verified using Community Earth System Model Large Ensemble Numerical Simulation (CESM‐LENS) datasets.

Язык: Английский

Recent Advances in Understanding Multi-scale Climate Variability of the Asian Monsoon DOI Open Access
Wen Chen, Renhe Zhang, Renguang Wu

и другие.

Advances in Atmospheric Sciences, Год журнала: 2023, Номер 40(8), С. 1429 - 1456

Опубликована: Май 20, 2023

Язык: Английский

Процитировано

41
Another look at interannual variations of the Asian-Australian monsoon during boreal summer: effects of sea surface temperatures in three tropical oceans DOI
Tao Zhou, Zhiwei Wu

Climate Dynamics, Год журнала: 2025, Номер 63(2)

Опубликована: Фев. 1, 2025

Язык: Английский

Процитировано

2
Possible Dynamic Mechanisms of High‐ and Low‐Latitude Wave Trains Over Eurasia and Their Impacts on Air Pollution Over the North China Plain in Early Winter DOI
Xiadong An, Wen Chen,

Shuo Fu

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2022, Номер 127(13)

Опубликована: Июнь 20, 2022

Abstract The Rossby wave train in boreal winter sometimes bifurcates into two branches near the Mediterranean, not. However, causes for bifurcating of are still being debated. Additionally, discussions about differences deterioration ability these trains on air pollution also insufficient. This study uses empirical orthogonal function (EOF) to obtain dominant modes November‐January season over Eurasia and discusses their different influences North China Plain (NCP). From EOF1 mode, bifurcation appears stem from reflection Mediterranean because source is located outside a strong absolute vorticity gradient. EOF2 propagates only along subtropical westerly jet inside gradient, so that tends be refracted Mediterranean. In addition, associated with suggested related eastern Pacific El Niño. Niño force propagating East Asia under charger effect positive feedback air‐sea coupling far Atlantic while mainly induced by natural internal variability. Furthermore, results indicate type cause higher PM 2.5 concentrations NCP through strengthened Northeast anomalous anticyclone.

Язык: Английский

Процитировано

18
Evaluation of the first year of Pandora NO2 measurements over Beijing and application to satellite validation DOI Creative Commons

Ouyang Liu,

Zhengqiang Li,

Yangyan Lin

и другие.

Atmospheric measurement techniques, Год журнала: 2024, Номер 17(2), С. 377 - 395

Опубликована: Янв. 19, 2024

Abstract. Nitrogen dioxide (NO2) is a highly photochemically reactive gas, has lifetime of only few hours, and at high concentrations harmful to human beings. Therefore, it important monitor NO2 with high-precision, time-resolved instruments. To this end, Pandora spectrometer been installed on the roof laboratory building Aerospace Information Research Institute Chinese Academy Sciences in Olympic Park, Beijing, China. The trace gases (including NO2, HCHO, O3) measured are made available through open-access database (https://data.pandonia-global-network.org/Beijing-RADI/Pandora171s1/, last access: 11 July 2023). In paper, an overview presented total tropospheric vertical column densities (VCDs) surface collected during first year operation, i.e., from August 2021 2022. data show that were winter low summer, diurnal cycle where reached minimum daytime. significantly lower 2022 Winter Olympics showing effectiveness emission control measures period. observations northerly winds, clean air transported Beijing concentrations, whereas southerly pollution surrounding areas high. contribution VCD varies daily seasonal timescales; monthly averages vary between 50 % 60 70 spring autumn. A comparison Pandora-measured collocated situ measurements using Thermo Scientific 42i-TL analyzer shows relationship Pandora-derived different for concentrations. Explanations these differences offered terms measurement techniques physical (transport) phenomena. use VCDs validation TROPOspheric Monitoring Instrument (TROPOMI) data, resampled 100 m × m, although average TROPOMI slightly lower, they well within expected error 0.5 Pmolec.cm-2 + (0.2 0.5) ⋅ VCDtrop (1 = 1 1015 molec cm−2). location instrument sub-orbital pixel 3.5 km 5.5 may result TROPOMI-derived 0.223 0.282 Pmolec.cm-2, 1.7 2 %. addition, also Beijing-RADI site representative area radius 10 km.

Язык: Английский

Процитировано

4
Subseasonal Variability of ENSO–East Asia Teleconnections Driven by Tropical Convection Over the Indian Ocean and Maritime Continent DOI Creative Commons
Chang‐Hyun Park, Seok‐Woo Son

Geophysical Research Letters, Год журнала: 2024, Номер 51(13)

Опубликована: Июнь 27, 2024

Abstract The El Niño–Southern Oscillation (ENSO) has a significant impact on the surface climate of East Asia by modulating atmospheric circulation over Kuroshio Extension. Here, we show that ENSO–East teleconnections are strongest in early winter due to combined effects Indian Ocean and Maritime Continent convections, but weakest mid‐winter as these tropical convections weaken. During Niño winter, convection is enhanced suppressed Continent. associated Rossby wave trains constructively interfere Extension, resulting anticyclonic anomalies. equatorial central Pacific minimal Asia. This result suggests rather than convection, precursors teleconnections, need be considered for subseasonal‐to‐seasonal prediction

Язык: Английский

Процитировано

3
Hybrid Transition of Subseasonal Atmospheric Regimes and Its Impact on the Extreme ‘West Cold‐East Warm’ Mode in North America DOI Open Access

Ruiwei Guo,

Yao Yao, Jiaqi Shi

и другие.

International Journal of Climatology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 7, 2025

ABSTRACT On February 22, 2023, North America experienced an unusual weather phenomenon characterised by extreme cold in the west and warmth east, reflecting a surface air temperature (SAT) seesaw pattern that significantly impacted human activities region. Utilising reanalysis data, we analysed this case as well similar events long‐term climate records. The results indicate mode is caused hybrid evolution of atypical Pacific Oscillation (NPO) Pacific‐North American (PNA) phase relationships, transitioning from dominant positive NPO to strong negative PNA phase, while maintaining developing blocking, which refer transition atmospheric regimes. Further analysis revealed anomalously weak meridional potential vorticity gradient (PVy) southern Alaska prior event provided favourable conditions for northward movement intensification anticyclone central Pacific, serving key driving factor circulation PNA. Additionally, significant anomalous outgoing longwave radiation (OLR) tropical Indian Ocean indicated enhanced convective activity region, may have triggered Rossby waves, thereby influencing between mid high latitudes. Thus, PVy OLR serve precursor indicators such events.

Язык: Английский

Процитировано

0
Deep Learning Model for ENSO Forecasting Using Multiple-Scale Spatiotemporal Information DOI
Yang Wang, Hassan A. Karimi, Xiaowei Jia

и другие.

IEEE Transactions on Geoscience and Remote Sensing, Год журнала: 2025, Номер 63, С. 1 - 10

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

0
The El Niño Southern Oscillation and the salinity of land and water in the United States DOI Creative Commons
Nicola Limodio, Filippo De Marco,

Ilaria Dal Barco

и другие.

PLoS ONE, Год журнала: 2025, Номер 20(2), С. e0311544 - e0311544

Опубликована: Фев. 3, 2025

The El Niño–Southern Oscillation (ENSO) is a periodic climate phenomenon with important consequences for weather and socioeconomic variables worldwide. This paper investigates the effect of Niño on concentration salts in soils fresh water. Our analysis shows effects that are statistically significant large magnitude. In particular, response to events, soil salinity increases by 21% northern region United States, where average temperatures positively affected, while it decreases 29% southern tiers country, decline. Similarly, water 9% warmer counties, 53% lower cooler counties.

Язык: Английский

Процитировано

0
Quantifying the Teleconnections Between East Asian Winter Precipitation and Tropical Sea Surface Temperatures Using Causal Analysis DOI Creative Commons
Tianjiao Ma, Wen Chen, Xiadong An

и другие.

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

Процитировано

0
Impact of MJO Seasonality on the Intensification of Intraseasonal PNA During El Niño and La Niña Winters DOI

Shenghua Jian,

Fang Zhou, Minghong Liu

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(8)

Опубликована: Апрель 19, 2025

Abstract This study mainly examined the distinct early‐to‐late winter variations in intraseasonal Pacific–North American teleconnection mode (ISPNA) under two El Niño–Southern Oscillation phases. Results showed that these were controlled by Madden–Julian (MJO) seasonality. Compared to Niño winters, ISPNA exhibits a stronger enhancement during La Niña winters. Furthermore, MJO and exhibit phase‐locked relationship, which is more pronounced reliable late winter. The Rossby wave activity associated with propagates northward from tropics toward subtropical action center of indicates increased contributes greater intensity. also clear seasonality, exhibiting early winter, particularly evident winters results intensified periods.

Язык: Английский

Процитировано

0