Measurement of aerosol chemical, physical and radiative properties in the Yangtze delta region of China

Xu, Jin; Bergin, Michael; Yu, Xiangming; Liu, G.; Zhao, Jing; Carrico, Christian M.; Baumann, Karsten

doi:10.1016/s1352-2310(01)00455-1

Cited by 223 publications

(180 citation statements)

References 22 publications

Supporting

Mentioning

156

Contrasting

Unclassified

Order By: Relevance

“…The values of σ and σ had large standard deviations reflecting strong fluctuations and large changes in the entire measurement period. A similar performance of aerosol optical parameters was also noted in other urban cities in China [14,22,26,42]. 99th percent of σ and σ were extremely large at 1518.65 Mm , respectively, which can mainly be attributed to severe haze events occurring in winter.…”

Section: Pblh Detectionsupporting

confidence: 78%

An Investigation of Aerosol Scattering and Absorption Properties in Wuhan, Central China

et al. 2015

View full text Add to dashboard Cite

, and 0.73, respectively. Both σ and σ showed obvious annual variability with large values in winter and small values in summer, principally caused by the annual characteristics of meteorological conditions, especially planetary boundary layer height (PBLH) and local emissions. The SSA showed a slight annual variation. High values of SSA were related to formation of secondary aerosols in winter hazes and aerosol hygroscopic growth in humid summer. The large SSA in June can be attributed to the biomass combustion in Hubei and surrounding provinces. Both σ and σ showed double peak phenomena in diurnal variation resulting from the shallow stable PBLH at night and automobile exhaust emission during morning OPEN ACCESSAtmosphere 2015, 6 504 rush hours. The SSA also exhibited a double peak phenomenon related to the proportional variation of black carbon (BC) and light scattering particulates in the day and night. The long-term exploration on quantified aerosol optical properties can help offer scientific basis of introducing timely environmental policies for local government.

show abstract

Section: Pblh Detectionsupporting

confidence: 78%

An Investigation of Aerosol Scattering and Absorption Properties in Wuhan, Central China

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Generally, the scattering enhancement factor (f (80 %) = 1.44) is much lower than the result (f (80 %) = 1.7-2.1) obtained by Xu et al (2002) for Lin'an in 1999. This value is also lower than the results obtained by Carrico during ACE-1 (Aerosol Characterization Experiment; Carrico et al, 1998) and ACE-Asia (Asian Pacific Regional Aerosol Characterization Experiment; Carrico et al, 2003), the values obtained by in several European sites and the Arctic, and the values reported at several sites in the US (Malm et al, 2005Day, 2001, 2000;Day and Malm, 2001).…”

Section: Overviewmentioning

confidence: 56%

“…Concurrent with population increase and economic growth are the increasing energy consumption and number of automobiles, causing the Yangtze River Delta to become a significant source of gas and particulate pollutants and secondary aerosol production. A 5-week field campaign was carried out in the early winter of 1999 at Lin'an, a background station in the Yangtze River Delta (Xu et al, 2002). However, since then the physical and chemical properties of gas and particulate pollutants have changed dramatically with the rapidly developing economy and fast growing population, e.g., from 1999 to 2013, the sulfate mass concentration decreased from 21.2 ± 11.5 to 8.1 ± 4.1 (mean ± SD) (Qi et al, 2012;Xu et al, 2008;ZEPB, 1999ZEPB, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

et al. 2015

View full text Add to dashboard Cite

Abstract. Scattering of solar radiation by aerosol particles is highly dependent on relative humidity (RH) as hygroscopic particles take up water with increasing RH. To achieve a better understanding of the effect of aerosol hygroscopic growth on light scattering properties and radiative forcing, the aerosol scattering coefficients at RH in the range of 40 to ∼ 90 % were measured using a humidified nephelometer system in the Yangtze River Delta of China in March 2013. In addition, the aerosol size distribution and chemical composition were measured. During the observation period, the mean and standard deviation (SD) of enhancement factors at RH = 85 % for the scattering coefficient (f (85 %)), backscattering coefficient (f b (85 %)), and hemispheric backscatter fraction (f β (85 %)) were 1.58 ± 0.12, 1.25 ± 0.07, and 0.79 ± 0.04, respectively, i.e., aerosol scattering coefficient and backscattering coefficient increased by 58 and 25 % as the RH increased from 40 to 85 %. Concurrently, the aerosol hemispheric backscatter fraction decreased by 21 %. The relative amount of organic matter (OM) or inorganics in PM 1 was found to be a main factor determining the magnitude of f (RH). The highest values of f (RH) corresponded to the aerosols with a small fraction of OM, and vice versa. The relative amount of NO − 3 in fine particles was strongly correlated with f (85 %), which suggests that NO − 3 played a vital role in aerosol hygroscopic growth during this study. The mass fraction of nitrate also had a close relationship to the curvature of the humidograms; higher mass fractions of nitrate were associated with humidograms that had the least curvature. Aerosol hygroscopic growth caused a 47 % increase in the calculated aerosol direct radiative forcing at 85 % RH, compared to the forcing at 40 % RH.

show abstract

“…These changes have resulted in high aerosol loading levels (Qiu and Yang, 2000;Luo et al, 2001;Zhang et al, 2013b;Li et al, 2013), decreases in visibility (Che et al, 2007), solar radiation (Che et al, 2005;Liang and Xia, 2006;Xia, 2010) and air quality (Xu et al, 2002), especially in areas of eastern China such as the Jing-Jin-Ji (Beijing, Tianjin and Hebei) region Li et al, 2007aLi et al, , b, 2011Ding et al, 2008), the Yangtze River Delta and parts of southern China such as around the Pearl River Delta (Wang et al, 2003;Gao et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Column aerosol optical properties and aerosol radiative forcing during a serious haze-fog month over North China Plain in 2013 based on ground-based sunphotometer measurements

et al. 2014

View full text Add to dashboard Cite

Abstract. In January 2013, North China Plain experienced several serious haze events. Cimel sunphotometer measurements at seven sites over rural, suburban and urban regions of North China Plain from 1 to 30 January 2013 were used to further our understanding of spatial-temporal variation of aerosol optical parameters and aerosol radiative forcing (ARF). It was found that Aerosol Optical Depth at 500 nm (AOD 500 nm ) during non-pollution periods at all stations was lower than 0.30 and increased significantly to greater than 1.00 as pollution events developed. The Angstrom exponent (Alpha) was larger than 0.80 for all stations most of the time. AOD 500 nm averages increased from north to south during both polluted and non-polluted periods on the three urban sites in Beijing. The fine mode AOD during pollution periods is about a factor of 2.5 times larger than that during the non-pollution period at urban sites but a factor of 5.0 at suburban and rural sites. The fine mode fraction of AOD 675 nm was higher than 80% for all sites during January 2013. The absorption AOD 675 nm at rural sites was only about 0.01 during pollution periods, while ∼ 0.03-0.07 and 0.01-0.03 during pollution and non-pollution periods at other sites, respectively. Single scattering albedo varied between 0.87 and 0.95 during January 2013 over North China Plain. The size distribution showed an obvious tri-peak pattern during the most serious period. The fine mode effective radius in the pollution period was about 0.01-0.08 µm larger than during nonpollution periods, while the coarse mode radius in pollution periods was about 0.06-0.38 µm less than that during nonpollution periods. The total, fine and coarse mode particle volumes varied by about 0.06-0.34 µm 3 , 0.03-0.23 µm 3 , and 0.03-0.10 µm 3 , respectively, throughout January 2013. During the most intense period (1-16 January), ARF at the surface exceeded −50 W m −2 , −180 W m −2 , and −200 W m −2 at rural, suburban, and urban sites, respectively. The ARF readings at the top of the atmosphere were approximately −30 W m −2 in rural and −40-60 W m −2 in urban areas.Published by Copernicus Publications on behalf of the European Geosciences Union. H. Che et al.: Column aerosol optical properties and aerosol radiative forcingPositive ARF at the top of the atmosphere at the Huimin suburban site was found to be different from others as a result of the high surface albedo due to snow cover.

show abstract

Measurement of aerosol chemical, physical and radiative properties in the Yangtze delta region of China

Cited by 223 publications

References 22 publications

An Investigation of Aerosol Scattering and Absorption Properties in Wuhan, Central China

An Investigation of Aerosol Scattering and Absorption Properties in Wuhan, Central China

Observations of relative humidity effects on aerosol light scattering in the Yangtze River Delta of China

Column aerosol optical properties and aerosol radiative forcing during a serious haze-fog month over North China Plain in 2013 based on ground-based sunphotometer measurements

Contact Info

Product

Resources

About