Simulated coordinated impacts of the previous autumn North Atlantic Oscillation (NAO) and winter El Niño on winter aerosol concentrations over eastern China

Feng, Juan; Li, Minglu; Liao, Hong; Zhu, Jiang

doi:10.5194/acp-19-10787-2019

Cited by 26 publications

(20 citation statements)

References 63 publications

(85 reference statements)

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“…The anomalous convergence circulation over southern China is not favorable for the transmission of ACs. That is, the anomalous circulation associated with a 3-month leading ENSO signal would connect with enhanced ACs over eastern China (Feng et al, 2019a), which agrees with the spatial distribution of EOF1. Moreover, the impacts of ENSO on the circulation is further seen by impacting the PBLH (Fig.…”

Section: Linkage With the Climate Variabilitiessupporting

confidence: 75%

“…This model is a three-dimensional tropospheric chemistry model with a 2.5 • longitude × 2 • latitude horizontal resolution and 30 vertical levels. The model is widely applied to investigate the potential modulation of climatic variabilities on the anomalous distributions of pollutants on various timescales, e.g., on the seasonal (Generoso et al, 2008;Jeong et al, 2011;Feng et al, 2016Feng et al, , 2019a, interannual (Jeong et al, 2017;Li et al, 2019), and interdecadal (Zhu et al, 2012) timescales. The high consistency in both the temporal and spatial distributions between the simulations and observations provides confidence for the feasibility of the present study.…”

Section: Modelmentioning

confidence: 99%

“…Zhao et al (2016) have indicated that the decadal regime shift of the PDO showed a significant role in impacting the decadal variations of boreal winter aerosols over eastern China. Feng et al (2019a) have reported the important influences of simultaneous ENSO and preceding autumn NAO signals on the winter ACs over China by a case study.…”

Section: Introductionmentioning

confidence: 99%

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Aerosol concentrations variability over China: two distinct leading modes

Feng

Zhu

et al. 2020

Atmos. Chem. Phys.

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Abstract. Understanding the variability in aerosol concentrations (ACs) over China is a scientific challenge and is of practical importance. The present study explored the month-to-month variability in ACs over China based on simulations of an atmospheric chemical transport model with a fixed emissions level. The month-to-month variability in ACs over China is dominated by two principal modes: the first leading monopole mode and the second meridional dipole mode. The monopole mode mainly indicates enhanced ACs over eastern China, and the dipole mode displays a south–north out-of-phase pattern. The two leading modes are associated with different climatic systems. The monopole mode relates to the 3 months leading the El Niño–Southern Oscillation (ENSO), while the dipole mode connects with the simultaneous variation in the North Atlantic Oscillation (NAO) or the Northern Hemisphere Annular Mode (NAM). The associated anomalous dynamic and thermal impacts of the two climatic variabilities are examined to explain their contributions to the formation of the two modes. For the monopole mode, the preceding ENSO is associated with anomalous convergence, decreased planetary boundary layer height (PBLH), and negative temperature anomalies over eastern China, which are unfavorable for emissions. For the dipole mode, the positive NAO is accompanied by opposite anomalies in the convergence, PBLH, and temperature over southern and northern China, paralleling the spatial formation of the mode. This result suggests that the variations originating from the tropical Pacific and extratropical atmospheric systems contribute to the dominant variabilities of ACs over China.

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Section: Linkage With the Climate Variabilitiessupporting

confidence: 75%

Section: Modelmentioning

confidence: 99%

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Aerosol concentrations variability over China: two distinct leading modes

Feng

Zhu

et al. 2020

Atmos. Chem. Phys.

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“…Cressman objective analysis adopts the method of successive corrections based on the Cressman interpolation method (Cressman, 1959), which has been widely used in various climate diagnosis analyses and numerical simulation studies. The key of the Cressman objective analysis is the determination of the weight function W i,j (Feng et al, 2004) (Eqs. 1-2):…”

Section: Methodsmentioning

confidence: 99%

The combined effect of two westerly jet waveguides on heavy haze in the North China Plain in November and December 2015

Liu

et al. 2020

Atmos. Chem. Phys.

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Abstract. Severe haze occurred in the North China Plain (NCP) from November to December 2015, with a wide spatial range and long duration. In this paper, the combined effect of the anomalous stationary Rossby waves within two westerly jet waveguides on this haze event in the NCP is investigated based on observational visibility data and NCEP/NCAR reanalysis data. The results show that circulation anomalies in Eurasia caused by the propagation of anomalous stationary Rossby wave energy along two waveguides within the westerly jet originating from the Mediterranean were responsible for haze formation in the NCP. The Rossby waves propagated eastward along the subtropical westerly jet and the polar front jet, causing an anomalous anticyclone over the Sea of Japan and anticyclonic wind shear at 850 hPa over the NCP, which enhanced the anomalous descent in the middle and lower troposphere and subsequently resulted in a stable lower atmosphere. Furthermore, the anomalous stationary Rossby waves propagating along the polar front jet weakened the East Asia trough and Ural ridge and strengthened the anomalous southerly wind at 850 hPa over the coastal areas of eastern China, decelerating the East Asia winter monsoon. The above meteorological conditions modulated haze accumulation in November and December 2015. Meanwhile, continuous rainfall related to ascending motion due to Rossby wave propagation along the waveguide provided by the subtropical westerly jet occurred in a large area of southern China. The associated latent heat release acted as a heat source, intensifying the ascending motion over southern China so that the descending motion over the NCP was strengthened, favoring the maintenance of severe haze. This study elucidates the formation and maintenance mechanism of large-scale haze in the NCP in late fall and boreal winter.

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“…We can understand the complexity behind the climatic causes of severe air pollution from some existing studies. For example, the combined effects of the negative North Atlantic Oscillation (NAO) and El Niño worsened air conditions over central and south China in the winters of 2000 and 2003 (Feng et al, 2019). The autumnal increased number of haze days in 2013 and 2014 was closely associated with simultaneous sea surface warming in the western North Pacific sector and the North Atlantic subtropical sector (Wang et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

The combined effect of two westerly jet waveguides on heavy haze in the North China Plain in November and December 2015

An¹,

Sheng²,

Liu³

et al. 2019

Preprint

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Abstract. Severe haze occurred in the North China Plain (NCP) from November to December 2015, with a wide spatial range and long duration. In this paper, the combined effect of two westerly jet waveguides on haze in the NCP was investigated based on visibility observational data and NCEP/NCAR reanalysis data. The results showed that the two Rossby waveguides within the westerly jet originating from the Mediterranean were responsible for the haze formation in the NCP. The Rossby wave propagated eastward along the subtropical westerly jet and the polar front jet, causing an anomalous anticyclone over the Sea of Japan and anticyclonic wind speed shear at 850 hPa over the NCP, which enhanced the anomalous descending air motion in the middle and lower troposphere and subsequently resulted in a stable atmosphere. Furthermore, the Rossby wave weakened the East Asia trough and Ural ridge, and strengthened the anomalous southerly wind at 850 hPa over the coastal areas of east China, decelerating the East Asia winter monsoon. The above meteorological conditions modulated haze accumulation in November and December 2015. Meanwhile, continuous rainfall related to ascending motion due to Rossby wave propagation along the subtropical westerly jet occurred in a large area of southern China. The latent heat released by rainfall acted as a heat source, inducing convection over South China. This further strengthened the ascending motion over South China so that the descending motion over the NCP was maintained, favoring the maintenance of severe haze. This study is of great significance to elucidate the formation and maintenance mechanism of large-scale haze in the NCP in late fall and boreal winter.

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Simulated coordinated impacts of the previous autumn North Atlantic Oscillation (NAO) and winter El Niño on winter aerosol concentrations over eastern China

Cited by 26 publications

References 63 publications

Aerosol concentrations variability over China: two distinct leading modes

Aerosol concentrations variability over China: two distinct leading modes

The combined effect of two westerly jet waveguides on heavy haze in the North China Plain in November and December 2015

The combined effect of two westerly jet waveguides on heavy haze in the North China Plain in November and December 2015

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