Secondary new particle formation in Northern Finland Pallas site  between the years 2000 and 2010

Asmi, Eija; Kivekäs, Niku; Kerminen, V.-M.; Komppula, Mika; Hyvärinen, Antti; Hatakka, Juha; Viisanen, Y.; Lihavainen, Heikki

doi:10.5194/acp-11-12959-2011

Cited by 113 publications

(140 citation statements)

References 68 publications

Supporting

Mentioning

115

Contrasting

Order By: Relevance

“…October. The multi-year annual average of SSA at BRW was found to be 0.960 (see Table 2), which agrees with the 20 SSA averages of 0.96 presented for BRW data from 1988-1993 in Bodhaine (1995) and 1997-2000in Delene and Ogren (2002. PAL has higher SSA values in the summer and lower SSA values in the winter.…”

supporting

confidence: 74%

Seasonality of aerosol optical properties in the Arctic

Schmeisser¹,

Backman²,

Ogren³

et al. 2018

Preprint

View full text Add to dashboard Cite

Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in-situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Systematic variability of aerosol optical properties in the Arctic supports the notion that the sites presented here 40 measure a variety of aerosol populations, which also experience different removal mechanisms. A robust conclusion from the seasonal cycles presented is that the Arctic cannot be treated as one common and uniform environment, but 2 rather is a region with ample spatio-temporal variability in aerosols. This notion is important in considering the design or aerosol monitoring networks in the region, and is important for informing climate models to better represent short-lived aerosol climate forcers in order to yield more accurate climate predictions for the Arctic.

show abstract

supporting

confidence: 74%

Seasonality of aerosol optical properties in the Arctic

Schmeisser¹,

Backman²,

Ogren³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…Other contributing factors likely include long-range transport of anthropogenic aerosol from Europe as well as biogenic emissions Tunved et al, 2006). In addition, at PAL, there is increased contribution from continental air masses during the summer, which contribute to the higher scattering values (Aalto et al, 2002;Asmi et al, 2011). Figure 4 shows monthly median values of the aerosol light absorption coefficient (σ ap ) from corrected Aethalometer data at all six Arctic sites, as well as boxplots of absorption coefficients for all months.…”

Section: Spatiotemporal Variability Of Aerosol Optical Properties In mentioning

confidence: 99%

“…PAL is located at the lowest latitude of all the sites in the study and is the closest in proximity to the European continent. Although the site itself is located on top of a fell above the tree line, the station is surrounded by a forest and thus affected by nearby biogenic emissions during the summer active vegetation season (Tunved et al, 2006;Lihavainen et al, 2009;Asmi et al, 2011). SUM is the highest in elevation of all the sites and measures free-tropospheric air much of the year.…”

Section: Spatiotemporal Variability Of Aerosol Optical Properties In mentioning

confidence: 99%

Seasonality of aerosol optical properties in the Arctic

et al. 2018

View full text Add to dashboard Cite

Abstract. Given the sensitivity of the Arctic climate to short-lived climate forcers, long-term in situ surface measurements of aerosol parameters are useful in gaining insight into the magnitude and variability of these climate forcings. Seasonality of aerosol optical properties -including the aerosol light-scattering coefficient, absorption coefficient, single-scattering albedo, scattering Ångström exponent, and asymmetry parameter -are presented for six monitoring sites throughout the Arctic: Alert, Canada; Barrow, USA; Pallas, Finland; Summit, Greenland; Tiksi, Russia; and Zeppelin Mountain, Ny-Ålesund, Svalbard, Norway. Results show annual variability in all parameters, though the seasonality of each aerosol optical property varies from site to site. There is a large diversity in magnitude and variability of scattering coefficient at all sites, reflecting differences in aerosol source, transport, and removal at different locations throughout the Arctic. Of the Arctic sites, the highest annual mean scattering coefficient is measured at Tiksi (12.47 Mm −1 ), and the lowest annual mean scattering coefficient is measured at Summit (1.74 Mm −1 ). At most sites, aerosol absorption peaks in the winter and spring, and has a minimum throughout the Arctic in the summer, indicative of the Arctic haze phenomenon; however, nuanced variations in seasonalities suggest that this phenomenon is not identically observed in all regions of the Arctic. The highest annual mean absorption coefficient is measured at Pallas (0.48 Mm −1 ), and Summit has the lowest annual mean absorption coefficient (0.12 Mm −1 ). At the Arctic monitoring stations analyzed here, mean annual single-scattering albedo ranges from 0.909 (at Pallas) to 0.960 (at Barrow), the mean annual scattering Ångström exponent ranges from 1.04 (at Barrow) to 1.80 (at Summit), and the mean asymmetry parameter ranges from 0.57 (at Alert) to 0.75 (at Summit). Systematic variability of aerosol optical properties in the Arctic supports the notion that the sites presented here measure a variety of aerosol populations, which also experience different removal mechanisms. A robust conclusion from the seasonal cycles presented is that the Arctic cannot be treated as one common and uniform environment but rather is a region with ample spatiotemporal variability in aerosols. This notion is important in considering the design or aerosol monitoring networks in the region and is important for informing climate models to better represent short-lived aerosol climate forcers in order to yield more accurate climate predictions for the Arctic.

show abstract

“…A similar seasonal behaviour of GR has been observed earlier in Värriö (Dal Maso et al, 2007), but in Pallas only summer maximum is seen . The earlier onset of nucleation during spring has not been observed earlier in northern Finland (Vehkamäki et al, 2004;Asmi et al, 2011). Vehkamäki et al (2004) used the time when elevated concentrations of 8 nm particles were first observed, as the event start time, which shifts the spring event start times later since the growth rates are at their minimum in spring.…”

Section: General Characteristics Of New Particle Formation Eventsmentioning

confidence: 99%

Trends in new particle formation in eastern Lapland, Finland: effect of decreasing sulfur emissions from Kola Peninsula

et al. 2014

Self Cite

View full text Add to dashboard Cite

Abstract. The smelter industry in Kola Peninsula is the largest source of anthropogenic SO 2 in the Arctic part of Europe and one of the largest within the Arctic domain. Due to socio-economic changes in Russia, the emissions have been decreasing especially since the late 1990s resulting in decreased SO 2 concentrations close to Kola in eastern Lapland, Finland. At the same time, the frequency of new particle formation days has been decreasing distinctively at SMEAR I station in eastern Lapland, especially during spring and autumn. We show that sulfur species, namely sulfur dioxide and sulfuric acid, have an important role in both new particle formation and subsequent growth and that the decrease in new particle formation days is a result of the reduction of sulfur emissions originating from Kola Peninsula. In addition to sulfur species, there are many other quantities, such as formation rate of aerosol particles, condensation sink and nucleation mode particle number concentration, which are related to the number of observed new particle formation (NPF) days and need to be addressed when linking sulfur emissions and NPF. We show that while most of these quantities exhibit statistically significant trends, the reduction in Kola sulfur emissions is the most obvious reason for the rapid decline in NPF days. Sulfuric acid explains approximately 20-50 % of the aerosol condensational growth observed at SMEAR I, and there is a large seasonal variation with highest values obtained during spring and autumn. We found that (i) particles form earlier after sunrise during late winter and early spring due to high concentrations of SO 2 and H 2 SO 4 ; (ii) several events occurred during the absence of light, and they were connected to higher than average concentrations of SO 2 ; and (iii) high SO 2 concentrations could advance the onset of nucleation by several hours. Moreover, air masses coming over Kola Peninsula seemed to favour new particle formation.

show abstract

Secondary new particle formation in Northern Finland Pallas site between the years 2000 and 2010

Cited by 113 publications

References 68 publications

Seasonality of aerosol optical properties in the Arctic

Seasonality of aerosol optical properties in the Arctic

Seasonality of aerosol optical properties in the Arctic

Trends in new particle formation in eastern Lapland, Finland: effect of decreasing sulfur emissions from Kola Peninsula

Contact Info

Product

Resources

About