New aerosol particle formation in different synoptic situations at
                        Hyytiälä, Southern Finland

Sogacheva, Larisa; Saukkonen, Lea; Nilsson, E. Douglas; Maso, Miikka Dal; Schultz, David M.; Leeuw, G. de; Kulmala, Markku

doi:10.1111/j.1600-0889.2008.00364.x

Cited by 44 publications

(23 citation statements)

References 62 publications

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“…In these marine air masses, the sub-3 nm particles grew only to~10 nm and appeared continuously for 2-4 h around the noon, but they disappeared as soon as [H 2 SO 4 ] began to drop afterward (Figure 3a). Synoptic situation analysis during NPF events in Finland [Sogacheva et al, 2008] previously suggested that cloudiness, often associated with frontal passages, decreased the amount of solar radiation and in turn reduced the growth of new particles. In the present study we did not have cloudiness data during our measurement periods.…”

Section: Resultsmentioning

confidence: 99%

Sub‐3 nm particles observed at the coastal and continental sites in the United States

Hallar

You

et al. 2014

JGR Atmospheres

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Direct measurements of atmospheric sub-3 nm particles are crucial for understanding the new particle formation mechanisms, but such measurements are very limited at present. We report measurements of sub-3nm particles at Brookhaven, New York (a coastal site in summer) and Kent, Ohio (a continental site in winter). During daytime, in approximately 80% of the observation days at both sites, sub3nm particle events were observed with concentrations of 2800 ± 1600 cm-3 , and they appeared with the elevated sulfuric acid concentrations. During the nighttime at the coastal site under the marine air mass influences, there were also substantial concentrations of sub-3nm particles (1500 ± 400 cm-3 ), but they did not grow larger. On the other hand, at the coastal Brookhaven site under the continental air mass influences and at the inland Kent site during the night, the sub-3nm particles were significantly lower (190 ± 130 cm-3 ).Our results indicate that sub-3nm particles were not always present, and their presence was rather closely associated with specific aerosol nucleation precursors: sulfuric acid and other unknown condensable chemical species likely present in the marine air masses. These findings are thus different from other studies conducted in the Finland boreal forest, which showed a persistent presence of high concentrations of sub2nm particles and that these sub-2nm particles were more correlated to monoterpene oxidation products than to sulfuric acid. Therefore, different nucleation mechanisms, as opposed on to a universal mechanism, involving different nucleation precursors dominate in different atmospheric environments with different emissions and transported trace gases.

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Section: Resultsmentioning

confidence: 99%

Sub‐3 nm particles observed at the coastal and continental sites in the United States

Hallar

You

et al. 2014

JGR Atmospheres

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“…By noon, when the newly formed particles were apparent, the sampled air had been in the marine boundary layer within only about a day. While previous statistical studies have indicated that clean marine and Arctic air masses result in higher NPF probabilities (Sogacheva et al, 2005(Sogacheva et al, , 2008, a possible enhancement of NPF likelihood due to rapid marine air transport has not been fully explored.…”

Section: Ocean-forest Interactionsmentioning

confidence: 99%

Evidence for Diverse Biogeochemical Drivers of Boreal Forest New Particle Formation

Lawler

Rissanen

Ehn

et al. 2018

Geophysical Research Letters

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New particle formation (NPF) is an important contributor to particle number in many locations, but the chemical drivers for this process are not well understood. Daytime NPF events occur regularly in the springtime Finnish boreal forest and strongly impact aerosol abundance. In April 2014 size‐resolved chemical measurements of ambient nanoparticles were made using the Time‐of‐Flight Thermal Desorption Chemical ionization Mass Spectrometer and we report results from two NPF events. While growth overall was dominated by terpene oxidation products, newly formed 20–70 nm particles showed enhancement in apparent alkanoic acids. The events occurred on days with rapid transport of marine air, which correlated with low background aerosol loading and higher gas phase methanesulfonic acid levels. These results are broadly consistent with previous studies on Nordic NPF but indicate that further attention should be given to the sources and role of non‐terpenoid organics and the possible contribution of transported marine compounds in this process.

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“…While a complete cloud coverage is classified as P < 0.3, a clear-sky is classified as P > 0.7 (Perez et al, 1990;Sogacheva et al, 2008;Sánchez et al, 2012). In Hyytiälä, the great majority of NPF events are initiated during the morning hours after sunrise, but before noon (Dada et al, 2017).…”

Section: Selecting Noncloudy Daysmentioning

confidence: 99%

Long-term analysis of clear-sky new particle formation events and nonevents in Hyytiälä

et al. 2017

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Abstract. New particle formation (NPF) events have been observed all around the world and are known to be a major source of atmospheric aerosol particles. Here we combine 20 years of observations in a boreal forest at the SMEAR II station (Station for Measuring Ecosystem-Atmosphere Relations) in Hyytiälä, Finland, by building on previously accumulated knowledge and by focusing on clear-sky (noncloudy) conditions. We first investigated the effect of cloudiness on NPF and then compared the NPF event and nonevent days during clear-sky conditions. In this comparison we considered, for example, the effects of calculated particle formation rates, condensation sink, trace gas concentrations and various meteorological quantities in discriminating NPF events from nonevents. The formation rate of 1.5 nm particles was calculated by using proxies for gaseous sulfuric acid and oxidized products of low volatile organic compounds, together with an empirical nucleation rate coefficient. As expected, our results indicate an increase in the frequency of NPF events under clear-sky conditions in comparison to cloudy ones. Also, focusing on clear-sky conditions enabled us to find a clear separation of many variables related to NPF. For instance, oxidized organic vapors showed a higher concentration during the clear-sky NPF event days, whereas the condensation sink (CS) and some trace gases had higher concentrations during the nonevent days. The calculated formation rate of 3 nm particles showed a notable difference between the NPF event and nonevent days during clear-sky conditions, especially in winter and spring. For springtime, we are able to find a threshold equation for the combined values of ambient temperature and CS, (CS (s −1 ) > −3.091 × 10 −5 × T (in Kelvin) + 0.0120), above which practically no clear-sky NPF event could be observed. Finally, we present a probability distribution for the frequency of NPF events at a specific CS and temperature.

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New aerosol particle formation in different synoptic situations at Hyytiälä, Southern Finland

Cited by 44 publications

References 62 publications

Sub‐3 nm particles observed at the coastal and continental sites in the United States

Sub‐3 nm particles observed at the coastal and continental sites in the United States

Evidence for Diverse Biogeochemical Drivers of Boreal Forest New Particle Formation

Long-term analysis of clear-sky new particle formation events and nonevents in Hyytiälä

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