Influences of El Niño Modoki event 1994/1995 on aerosol concentrations over southern China

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

doi:10.1002/2015jd023659

Cited by 34 publications

(37 citation statements)

References 59 publications

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“…9a, they were obvious by comparing with La Niña winter (Fig. 9c), which was generally in line with the simulation result of Feng et al (2016). It can be seen in Fig.…”

Section: The Effects Of Enso On Winter Atmospheric Aerosol Contentsupporting

confidence: 78%

“…Gao and Li (2015) revealed statistically and through case analyses that El Niño (La Niña) events were more likely to bring about more (fewer) haze days in eastern China (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) • N, 105-122.5 • E). Feng et al (2016) simulated the influence of the 1994/1995 El Niño Modoki event on the aerosol concentrations over southern • N, 105-120 • E), and found that the aerosol concentrations increased during the mature phase (in boreal winter) of the event. Feng et al (2017) simulated the influence of the 1998/1999 and 2000/2001 La Niña Modoki events on the aerosol concentrations over eastern China (105-120 • E), and found that the geographical distributions of aerosols over eastern China during the winters of the two events were opposite with each other.…”

Section: Introductionmentioning

confidence: 99%

“…Feng et al (2016) simulated the influence of the 1994/1995 El Niño Modoki event on the aerosol concentrations over southern • N, 105-120 • E), and found that the aerosol concentrations increased during the mature phase (in boreal winter) of the event. Feng et al (2017) simulated the influence of the 1998/1999 and 2000/2001 La Niña Modoki events on the aerosol concentrations over eastern China (105-120 • E), and found that the geographical distributions of aerosols over eastern China during the winters of the two events were opposite with each other. Most previous studies discussed the effects of ENSO on the winter haze pollution of China based on observation or case simulation separately.…”

Section: Introductionmentioning

confidence: 99%

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The effects of El Niño–Southern Oscillation on the winter haze pollution of China

2018

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Abstract. It has been reported in previous studies that El Niño-Southern Oscillation (ENSO) influenced not only the summer monsoon, but also the winter monsoon over East Asia. This contains some clues that ENSO may affect the winter haze pollution of China, which has become a serious problem in recent decades, through influencing the winter climate of East Asia. In this work, we explored the effects of ENSO on the winter (from December to February) haze pollution of China statistically and numerically. Statistical results revealed that the haze days of southern China tended to be fewer (more) than normal in El Niño (La Niña) winter, whereas the relationships between the winter haze days of northern and eastern China and ENSO were not significant. Results from numerical simulations also showed that ENSO influenced the winter atmospheric anthropogenic aerosol content over southern China more obviously than it did over northern and eastern China. Under the emission level of aerosols for the year 2010, winter atmospheric anthropogenic aerosol content over southern China was generally greater (less) than normal in El Niño (La Niña) winter. This was because the transport of aerosols from South and Southeast Asia to southern China was enhanced (weakened), which masked the better (worse) scavenging conditions for aerosols in El Niño (La Niña) winter. The frequency distribution of the simulated daily surface concentrations of aerosols over southern China indicated that the region tended to have fewer clean and moderate (heavy) haze days, but more heavy (moderate) haze days in El Niño (La Niña) winter.

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“…9a, they were obvious by comparing with La Niña winter (Fig. 9c), which was generally in line with the simulation result of Feng et al (2016). It can be seen in Fig.…”

Section: The Effects Of Enso On Winter Atmospheric Aerosol Contentsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of El Niño–Southern Oscillation on the winter haze pollution of China

2018

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“…Meanwhile, we reported previously that the El Niño Modoki plays an essential role in influencing aerosol concentrations during its lifespan and the impacts vary between developing and decaying phases [ Feng et al ., ]. In this study we explore the possible impacts of its counterpart, the La Niña Modoki, on the aerosol concentrations, to gain a better understanding of the influence of ENSO Modoki on aerosol concentrations over China.…”

Section: Introductionmentioning

confidence: 99%

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

Feng

Zhu

et al. 2017

JGR Atmospheres

Self Cite

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Using the Goddard Earth Observing System (GEOS)‐Chem model driven by GEOS‐4 assimilated meteorological data, the potential influence of two La Niña Modoki events on aerosol concentrations over eastern China is explored. The results indicate that the impact of La Niña Modoki on aerosol concentrations differs between strong and moderate events. During the mature phase of the strong event of 1998/1999, an anomalous dipole pattern is observed over eastern China, i.e., with increased aerosol concentrations in the south and reduced concentrations in the north. The dipole pattern in the moderate event of 2000/2001 is reversed, with reduced aerosol concentrations in the south and increased concentrations in north China. Additionally, decreased aerosol concentrations are seen in spring of the decaying phase for the 1998/1999 event, while in the decaying spring of the 2000/2001 event, the dipole is reversed relative to the mature phase. During the decaying summer, aerosol concentrations are found to increase over eastern China in the 1998/1999 event but not in the 2000/2001 event. These anomalous aerosol concentrations are mainly caused by changes in circulation associated with the two La Niña Modoki events. In contrast, the role of wet deposition is observed to be limited during the lifespan of these two events. It is also found that the potential influence of the two La Niña Modoki events on aerosol concentrations can be up to 20% of the climatological mean. This suggests that La Niña Modoki has an important role in determining the distribution of aerosol concentrations over eastern China.

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“…The distribution probability of MLH being below 1000m in Decembers of 2013,2014 and 2015 were 32.3%, 9.7%, and 48.4%, respectively, indicating that December 2015 had a superior atmospheric stability and the meteorological conditions were thus not favorable for air pollutant diffusion and movement. The meteorological conditions were possibly caused by the strong El Nino effect occurred in the winter of 2015 (Chang et al, 2016;Feng et al, 2016;Wie and Moon, 2016). .…”

Section: Meteorological Conditions and Pm 25 Evolution Characteristimentioning

confidence: 99%

An Integrated WRF-CAMx Modeling Approach for Impact Analysis of Implementing the Emergency PM2.5 Control Measures during Red Alerts in Beijing in December 2015

Jia

Cheng

Liu

et al. 2017

Aerosol Air Qual. Res.

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In December 2015, the Beijing-Tianjin-Hebei (BTH) region experienced several episodes of heavy air pollution. Beijing municipal government therefore issued 2 red alerts on December 7 and 19, respectively, and also implemented emergency control measures to alleviate the negative effects of pollution. It is estimated that the heavy pollutions in 2 red alert periods in Beijing were due mainly to the accumulation of air pollutants from local emission sources and the transboundary transport of pollutants from surrounding areas. The collected meteorological and PM 2.5 data indicate that the severity of air pollutions were enlarged by the poor meteorological conditions along with lower mixing layer height. In this study, the WRF-CAMx modeling system was utilized not only for analyzing the contributions of PM 2.5 from different sources, but also for quantitatively assessing the effects of implementing various emergency control measures on PM 2.5 pollution control during the red alert periods. The modeling results show that local emissions were the most dominant contributors (64.8%-83.5%) among all emission sources, while the main external contributions came from the city of Baoding (3.4%-9.3%). In addition, among 5 different emission source categories, coal and traffic were the two dominant contributors to PM 2.5 concentration in urban area of Beijing. Then four pollution control scenarios were designed particularly to investigate the effectiveness of the emergency control measures, and the results show that, generally these emergency control measures have positive effects on air pollution reduction. In particular, restrictive measures of traffic volume control and industrial activity shutdown/suspension have been found as the most effective measures in comparison to other emergency control measures. It is recommended that such effective measures should be considered to implement when next time similar heavy air pollutions occur in the city of Beijing.

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Influences of El Niño Modoki event 1994/1995 on aerosol concentrations over southern China

Cited by 34 publications

References 59 publications

The effects of El Niño–Southern Oscillation on the winter haze pollution of China

The effects of El Niño–Southern Oscillation on the winter haze pollution of China

Simulated contrasting influences of two La Niña Modoki events on aerosol concentrations over eastern China

An Integrated WRF-CAMx Modeling Approach for Impact Analysis of Implementing the Emergency PM2.5 Control Measures during Red Alerts in Beijing in December 2015

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