Trans-boundary aerosol transport during a winter haze episode in China revealed by ground-based Lidar and CALIPSO satellite

Qin, Kai; Wu, Lei; Wong, Man Sing; Letu, Husi; Hu, Mingyu; Hongmei, Lang; Sheng, Shijie; Teng, Jiyao; Xiao, Xin; Yuan, Limei

doi:10.1016/j.atmosenv.2016.06.042

Cited by 75 publications

(35 citation statements)

References 33 publications

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“…For all regions, despite differences in seasonal mean AOTs from different sensors, negative AOT trends are found by using over water AOT retrievals from all sensors for MAM, JJA, and SON seasons after 2006–2008. A clear difference is seen for the DJF season where near zero or even slightly positive AOT trends are found, which may or may not related to burning coal for winter warming and perhaps the complex formation of severe inversion induced air quality events [e.g., Qin et al , ; Yu et al , ].…”

Section: Resultsmentioning

confidence: 99%

Has China been exporting less particulate air pollution over the past decade?

Zhang

Reid²,

Alfaro-Contreras

et al. 2017

Geophysical Research Letters

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Particulate matter (PM) pollution from China is transported eastward to Korea and Japan and has been suggested to influence surface air quality on the West Coast of the United States. However, remote sensing studies have been inconclusive as to recent trends in Chinese emissions and transport. We reconciled different passive remote sensing points of view and found that while aerosol optical thickness (AOT) as an indicator of particulate pollution has increased from the start of the observation period (2000) to 2006–2007 from the main Chinese coastal outflow regions, since then there has been a 10–20% decrease in AOT (with respect to 2007). Reductions were observed in spring, summer, and fall seasons. No improvement in exported PM pollution is found for the winter season.

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Section: Resultsmentioning

confidence: 99%

Has China been exporting less particulate air pollution over the past decade?

Zhang

Reid²,

Alfaro-Contreras

et al. 2017

Geophysical Research Letters

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“…Aerosols are highly mobile in the atmosphere, easily crossing continents and oceans, and are well explained in numerous literatures (e.g. Huang et al ., ; Uno et al ., ; Brock et al ., ; Guleria et al ., , , ; Prasad et al ., ; Qin et al ., ). Transported aerosols mixed with regional emission, change their properties, and thereby produce consequent effects on regional climate (Chin et al ., ; Gautam et al ., ; Guleria and Kuniyal, , ; Sun et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Spatial‐temporal characteristics of aerosol loading over the Yangtze River Basin during 2001–2015

Ming

Wang

et al. 2017

Intl Journal of Climatology

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The spatial‐temporal characteristics of aerosol loading over the Yangtze River Basin, China during 2001–2015 were investigated using moderate resolution imaging spectroradiometer (MODIS), multi‐angle imaging spectroradiometer (MISR), and ground‐level particulate matter (PM) data. Aerosol optical depth (AOD) >0.8 occurs in the Yangtze River Delta, central China, and the Sichuan Basin, while AOD <0.3 occurs over higher‐elevation areas in the western Sichuan Plateau and the source regions of the Yangtze River. The western Sichuan Plateau is characterized by fine‐mode natural aerosols, while the source region of the Yangtze River is more influenced by dust aerosols. The Sichuan Basin, central China, and the Yangtze River Delta are dominated by anthropogenic aerosols. The spatial distribution of ground‐level PM2.5 and its ratio to PM10 confirm the high aerosol loading and dominance of small particles over the middle and lower Yangtze Basin. Over the Yangtze River Delta, central China, and the Sichuan Basin, AOD varies seasonally from low in the cold months to high in the warm months, being suppressed by rainfall and wind during the Asian summer monsoon. Precipitation increases aerosol loading in the western Sichuan Plateau but reduces dust particles in the source region of the Yangtze River. There is no significant AOD trend over most areas of the Yangtze River Basin during 2001–2015, while strong decreasing trends are found over most of the middle and lower Yangtze Basin during 2011–2015. These decreasing trends may relate to changes in annual precipitation, wind speed, and air‐pollution control policies. The NO2 and SO2 emissions decreased by 16.51 and 23.40% over major provinces and cities of the Yangtze River Basin from 2011 to 2015. An increase in rainfall over the middle and lower Yangtze Basin and a better pollutant diffusion condition in the Sichuan Basin also favour the decreasing AOD during this period.

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“…The dispersion of atmospheric pollutants depends mostly on atmospheric turbulence and horizontal wind, which accelerates the vertical and horizontal diffusion of aerosol (Ding et al, ; Pal et al, ; Zheng et al, ). On the other side, except for the contributions of local pollutant emissions, atmospheric transport, and atmospheric chemistry (Guo et al, , ; Qin et al, ; Yao et al, ; Yim et al, ), the role of meteorological conditions cannot be ignored, such as strong temperature inversion or large‐scale high‐pressure systems (Miao, Guo, Liu, Liu, Li, et al, ). The increases in absorbing aerosol tend to stabilize the PBL and suppress the PBL, which consequently exacerbates the haze pollution (Ding et al, ; Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

Lou

Guo

Wang

et al. 2019

Earth and Space Science

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The observed relationships between boundary layer height (BLH) and PM2.5 on a national scale remain unclear due to the dearth of observations. Here we investigated this relationship from a unique perspective of thermodynamic stability in the planetary boundary layer (PBL), using summertime (June–August) soundings from China for the period from 2014 to 2017. For all three times of soundings (0800, 1400, and 2000 Beijing time [BJT]), positive (negative) PM2.5 concentrations anomalies were found to correlate with negative (positive) BLHs anomalies relative to daily means. The negative correlation was strongest at 1400 BJT, followed by 2000 BJT and 0800 BJT. Overall, the PM2.5 was found to nonuniformly anticorrelate with BLH across China at 0800 and 2000 BJT. The strongest anticorrelation occurred in the North China Plain at 1400 BJT, in sharp contrast to the much weaker correlation in other regions characterized by much less polluted regions. The averaged PM2.5 in neutral boundary layers was higher than that in convective boundary layers (CBLs). The CBL, where the anticorrelation was the strongest, was conducive to dissipating more aerosol in the heavily polluted area in China than neutral boundary layer. The higher CBL formed under low cloud cover, low surface humidity, and strong wind speed was favorable for the dispersion of aerosol, in contrast to the stable boundary layers that happen under the highest cloud cover. Also, positive correlation was seen between stable boundary layer and PM2.5. The findings call for attention that the thermodynamical condition of PBL should be considered when examining the aerosol‐PBL interactions.

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Trans-boundary aerosol transport during a winter haze episode in China revealed by ground-based Lidar and CALIPSO satellite

Cited by 75 publications

References 33 publications

Has China been exporting less particulate air pollution over the past decade?

Has China been exporting less particulate air pollution over the past decade?

Spatial‐temporal characteristics of aerosol loading over the Yangtze River Basin during 2001–2015

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

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