Aerosol nucleation spikes in the planetary boundary layer

Chen, J.-P.; Tsai, T.-S.; Liu, S.-C.

doi:10.5194/acpd-10-26931-2010

Cited by 4 publications

(5 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nucleation range particles show an evident increase during daytime, which is broadly comparable with the diurnal pattern in solar irradiance. Similar diurnal cycles have been observed in other studies (e.g., Kulmala and Kerminen, 2008;Chen et al, 2011;Hirsikko et al, 2013) and have been attributed to nucleation events driven by photochemical reactions and possibly assisted by turbulent mixing in the atmosphere (Janssen et al, 2012). However, the diurnal cycle of nucleation particles is also very similar to that of air traffic intensity.…”

Section: Overview Of Datasupporting

confidence: 86%

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Masiol

Beddows

et al. 2016

Atmospheric Environment

View full text Add to dashboard Cite

h i g h l i g h t sParticle number, size and black carbon were measured at the airport of Venice. Data were analysed along with gases, weather parameters and flight traffic. Six potential sources were identified and apportioned by PMF analysis on PNSD. Airport emissions contributed~20% to the total PNC. No specific local sources of BC can be identified as dominant. a b s t r a c t Atmospheric particles are of high concern due to their toxic properties and effects on climate, and large airports are known as significant sources of particles. This study investigates the contribution of the Airport of Venice (Italy) to black carbon (BC), total particle number concentrations (PNC) and particle number size distributions (PNSD) over a large range (14 nme20 mm). Continuous measurements were conducted between April and June 2014 at a site located 110 m from the main taxiway and 300 m from the runway. Results revealed no significantly elevated levels of BC and PNC, but exhibited characteristic diurnal profiles. PNSD were then analysed using both k-means cluster analysis and positive matrix factorization. Five clusters were extracted and identified as midday nucleation events, road traffic, aircraft, airport and nighttime pollution. Six factors were apportioned and identified as probable sources according to the size profiles, directional association, diurnal variation, road and airport traffic volumes and their relationships to micrometeorology and common air pollutants. Photochemical nucleation accounted for~44% of total number, followed by road þ shipping traffic (26%). Airport-related emissions accounted for~20% of total PNC and showed a main mode at 80 nm and a second mode beyond the lower limit of the SMPS (<14 nm). The remaining factors accounted for less than 10% of number counts, but were relevant for total volume concentrations: nighttime nitrate, regional pollution and local resuspension. An analysis of BC levels over different wind sectors revealed no especially significant contributions from specific directions associated with the main local sources, but a potentially significant role of diurnal dynamics of the mixing layer on BC levels. The approaches adopted in this study have identified and apportioned the main sources of particles and BC at an international airport located in area affected by a complex emission scenario. The results may underpin measures for improving local and regional air quality, and health impact assessment studies.

show abstract

Section: Overview Of Datasupporting

confidence: 86%

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Masiol

Beddows

et al. 2016

Atmospheric Environment

View full text Add to dashboard Cite

show abstract

“…At a downwind location in Taiwan's northern tip, Chen et al. (2011) reported aerosol concentrations of approximately 2,000–3,000 cm −3 during the spring of 2001. Kim et al.…”

Section: Methodsmentioning

confidence: 99%

“…Observational and theoretical results have generally and partially agreed with the first and second AIEs, respectively (e.g., Ackerman et al., 2004; Chen et al., 2012; Chen et al., 2014; Chen et al., 2015a, 2015b; Christensen & Stephens, 2011; Feingold, 2003; Koren et al., 2014; L'Ecuyer et al., 2009; Lu & Seinfeld, 2006; Rosenfeld, 2000; Seifert et al., 2015; Sorooshian et al., 2009; Yuan et al., 2011). Many studies have noted deviation from the second AIE on warm clouds, including the trends for liquid water path (LWP) (e.g., Ackerman et al., 2004; Chen et al., 2014; Gryspeerdt et al., 2019; Rosenfeld et al., 2019; Toll et al., 2019), cloud thickness (e.g., Chen et al., 2011; Seifert et al., 2015), and cloud cover (e.g., Goren et al., 2018; Seifer et al., 2015; Xue et al., 2008) under increasing aerosol loading, especially under aerosol‐rich or light‐drizzling conditions. It has been discovered that the AIEs is found to depend on meteorological conditions.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Aerosol Indirect Effects on Cloud Streets Over the Northwestern Pacific Ocean

Chen

2021

JGR Atmospheres

View full text Add to dashboard Cite

We simulated aerosol effects on cloud streets formed during continental cold‐air outbreaks over the Northwestern Pacific using an aerosol‐sensitive cloud microphysical scheme coupled with the Weather Research and Forecast model. The micro‐ and macro‐scale responses were examined under a wide range of aerosol concentrations. The cloud streets generally remain in a transient state, indicating that the aerosol particles may significantly affect the cloud system's development. The simulation results revealed a clear Twomey effect, but they were contrary to some of the Albrecht effect, especially under relatively clean conditions. Such reversed Albrecht effects stem mainly from dynamic response to changes in atmospheric stability associated with drizzle evaporation in the sub‐cloud layer. The dynamic response works against thermal forcing from the large air‐sea temperature gradient in a cold‐air outbreak. As the aerosol increases, the drizzle mechanisms weaken, and the boundary layer becomes more convective, leading to stronger dry‐air entrainment from the free troposphere. In individual clouds, the effect of entrainment on cloud water content may be compensated by more substantial vertical vapor flux. These mechanisms lead to a reduction in the cloud amount. Furthermore, the reduced moisture flux from drizzle evaporation in the sub‐cloud layer, as well as the reduced sedimentation speed of the smaller cloud drops, tend to lessen cloud thickness. The overall reduction in cloud dimensions may offset the Twomey effect by up to 20% in cloud albedo.

show abstract

“…Other areas of strong increase in particle number concentrations include Southeast Asia, South China Sea, and Philippine Sea. These were areas of relatively low particle concentrations, a condition favorable for new particle formation [ Shaw , ; Petters et al , ; Chen et al , ]. Over such areas, the presence of a small amount of dust can significantly reduce the surface area for SAV to condense on, and this would lead to accumulation of SAV in the air and thus enhanced H 2 O‐H 2 SO 4 binary nucleation.…”

Section: Mixing State During a Dust Eventmentioning

confidence: 99%

Numerical investigation of the coagulation mixing between dust and hygroscopic aerosol particles and its impacts

et al. 2015

View full text Add to dashboard Cite

A statistical-numerical aerosol parameterization was incorporated into the Community Multiscale Air Quality modeling system to study the coagulation mixing process focusing on a dust storm event that occurred over East Asia. Simulation results show that the coagulation mixing process tends to decrease aerosol mass, surface area, and number concentrations over the dust source areas. Over the downwind oceanic areas, aerosol concentrations generally increased due to enhanced sedimentation as particles became larger upon coagulation. The mixture process can reduce the overall single-scattering albedo by up to 10% as a result of enhanced core with shell absorption by dust and reduction in the number of scattering particles. The enhanced dry deposition speed also altered the vertical distribution. In addition, the ability of aerosol particles to serve as cloud condensation nuclei (CCN) increased from around 10 7 m À3 to above 10 9 m À3 over downwind areas because a large amount of mineral dust particles became effective CCN with solute coating, except over the highly polluted areas where multiple collections of hygroscopic particles by dust in effect reduced CCN number. This CCN effect is much stronger for coagulation mixing than by the uptake of sulfuric acid gas on dust, although the nitric acid gas uptake was not investigated. The ability of dust particles to serve as ice nuclei may decrease or increase at low or high subzero temperatures, respectively, due to the switching from deposition nucleation to immersion freezing or haze freezing.

show abstract

Aerosol nucleation spikes in the planetary boundary layer

Cited by 4 publications

References 56 publications

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Source apportionment of wide range particle size spectra and black carbon collected at the airport of Venice (Italy)

Simulation of Aerosol Indirect Effects on Cloud Streets Over the Northwestern Pacific Ocean

Numerical investigation of the coagulation mixing between dust and hygroscopic aerosol particles and its impacts

Contact Info

Product

Resources

About