Influences of El Nino Southern Oscillation events on haze frequency in eastern China during boreal winters

Gao, Hui; Li, Xiang

doi:10.1002/joc.4133

Cited by 60 publications

(28 citation statements)

References 22 publications

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“…Therefore, we conclude that the major forcing factor of atmospheric loading of pollutants and the resulting haze days in China was wind strength rather than anthropogenic emissions. This conclusion is consistent with the coincidence of the haze days with weak wind strength observed in the meteorological registers of the past several decades (H Chen & Wang, ; Hui & Xiang, ; H Wang et al, ; Xiao et al, ). Nevertheless, the dominant role of wind strength cannot exclude the contribution of anthropogenic emissions to high exposure to aerosol pollutions in China.…”

Section: Resultssupporting

confidence: 87%

“…During the past 40 years, the TSST, AMO, and ICE exhibited a coherent pattern of changes characterized by an increase in the TSST, a positive anomaly of the AMO, and a decrease in the ICE (Figure ). All of these changes have been suggested as the cause of the weak wind strength favoring haze formation in China (Hui & Xiang, ; H Wang et al, ; Xiao et al, ). The consistent variations of these factors clearly demonstrate that the short‐term observations are insufficient to capture all change scenarios to identify the major forcing factor of haze formation in China.…”

Section: Resultsmentioning

confidence: 99%

“…To discriminate the major forcing factors of wind strength over the past 180 years, we compared our records with the observed temperature changes in China (Shaowu et al, ), the annual average tropical ocean surface temperature (TSST; Huang et al, ), the Atlantic Multidecadal Oscillation (AMO; Trenberth & Shea, ), and the Arctic sea ice extent (ICE; H Wang et al, ; Figure ). All these factors have been suggested as the major forcing factors of heavy haze days in China (Hui & Xiang, ; H Wang et al, ; Xiao et al, ). Notably, the wind strength is inversely related to the meteorological registers of temperature changes in China, suggesting a close association between them (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…Journal of Geophysical Research: Atmospheres registers of the past several decades Hui & Xiang, 2014;Xiao et al, 2014). Nevertheless, the dominant role of wind strength cannot exclude the contribution of anthropogenic emissions to high exposure to aerosol pollutions in China.…”

Section: 1029/2018jd030119mentioning

confidence: 99%

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Global Warming Increases the Incidence of Haze Days in China

Luo

et al. 2019

JGR Atmospheres

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Both wind strength and anthropogenic emissions have been assumed to be the dominant factors in determining the occurrence of hazy weather in China. However, few records are available with sufficient temporal length and resolution, which enable the two signals to be separated, and hence address the dynamics of haze days and the global impact of the anthropogenic emissions in China, particularly in the context of global warming. Here we present the first long‐term (last ~180 years) lake sediment records of changes in wind strength and atmospheric loading of anthropogenic emissions in China. Our results show that the atmospheric loading of anthropogenic emissions and haze formation are closely related to the changes in wind strength associated with temperature changes, which are likely forced by tropical sea surface temperature. Comparison of our results with Pb isotope records from Japan and with the record of Pb concentrations in Greenland ice core indicates that the anthropogenic pollutants emitted in China stagnate mainly over the source area and neighboring regions, which thus favors haze formation under a warming climate. However, they would be transported worldwide under conditions of strong winds and decreased temperature. Climatic warming, together with the periodic changes in temperature, has caused unprecedented heavy haze days in recent decades in China. The observed pattern of periodic temperature variations suggests that in the next ~30 years, wind strength will increase and thus reduce the incidence of haze days. However, this reduction may be attenuated by continued climatic warming as anthropogenic greenhouse gases emissions continue.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: 1029/2018jd030119mentioning

confidence: 99%

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Global Warming Increases the Incidence of Haze Days in China

Luo

et al. 2019

JGR Atmospheres

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“…The deteriorated haze pollution was related to the increase in anthropogenic emissions (Qu et al 2015) and the variations in atmospheric circulations (Hui and Xiang, 2015;Li et al, 2016). These haze layers could spread across northern and eastern China and persist over a week during autumn and winter, inducing elevated PM 2.5 concentration exceeding 500 μg m −3 and instantaneous visibility degradation to less than 200 m Li, Zhou et al, 2011).…”

Section: Wrf-chem Model Descriptionsmentioning

confidence: 99%

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

Li¹,

Wang²,

Xie³

et al. 2017

Tellus B: Chemical and Physical Meteorology

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Severe haze events and their radiation feedbacks exert a profound impact on the weather and tropospheric chemistry. Using the on-line-coupled Weather Research and Forecasting with Chemistry (WRF-Chem) model, this study investigates the impacts of direct aerosol-radiation feedbacks on local air quality (i.e. particulate matter and ozone photochemistry) during a severe autumn haze episode in Nanjing megacity, eastern China. Pronounced radiation feedbacks are found for the predictions of meteorological and chemical variables. In response to the negative radiative forcing of scattering-dominant anthropogenic haze aerosols, the instantaneous irradiance and temperature at the surface lower by 130 W m −2 and 1.1-1.4 °C, respectively, leading to a reduction of boundary layer height by 103.2-232.6 m (11-38%) and vertical wind speed by 0.1-0.8 mm s −1 (2-30% at mid-day) during this haze event. Such a stable atmosphere favours the accumulation of fine particles (30.5 μg m −3 , 28.7%) and NO 2 (6.0 ppb, 23.7%) in the urban pollution plume. The weaker turbulent mixing and photochemical activity associated with the enhanced titration loss, and reduced downward radiation and photolysis rate result in a 0.1−5.0 ppb (12.0%) reduction of near-surface ozone. The simulations highlight that the aerosol-radiation feedbacks play an important role in the atmospheric transport and chemistry of large urban pollution plumes.

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The relationship between the subtropical Western Pacific SST and haze over North‐Central North China Plain

Yin

Wang

2015

Intl Journal of Climatology

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ABSTRACT:Haze is a serious issue in China today, presenting a substantial pollution problem to the public. To enhance understanding of haze mechanisms in recent years, this study examined the relationship between the subtropical western Pacific sea surface temperature (SST) and the haze pollution over North-Central North China Plain. The empirical orthogonal function result showed an opposite trend of boreal winter (December-January-February) haze days (WHD) between the south and north of the Huaihe River. The negative sea surface temperature anomaly (SSTA) over the subtropical western Pacific could intensify the WHD over North-Central North China Plain. As an effective external forcing, the preceding boreal autumn (Sepember-October-November) negative SSTA could weaken the East Asian winter monsoon (EAWM) circulation, leading to conditions such as a weaker Siberian High, reduced wind speed, higher humidity and an abnormal southerly wind. These conditions provide a favourable environment for haze with static stability and potential for hygroscopic growth. A series of SST sensitivity experiments were carried out using version 3.1 of the Community Atmosphere Model. When negative SSTA with different strengths were added into the model, all the key factors exhibited favourable features for haze, such as smaller EAWM index, stronger inversion potential, weaker vertical velocity, lower boundary layer height and higher relative humidity.

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Influences of El Nino Southern Oscillation events on haze frequency in eastern China during boreal winters

Cited by 60 publications

References 22 publications

Global Warming Increases the Incidence of Haze Days in China

Global Warming Increases the Incidence of Haze Days in China

Impacts of aerosol-radiation feedback on local air quality during a severe haze episode in Nanjing megacity, eastern China

The relationship between the subtropical Western Pacific SST and haze over North‐Central North China Plain

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