On the annual variability of Antarctic aerosol size distributions at Halley research station

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On the annual variability of Antarctic aerosol size distributions at Halley research station. / Lachlan-Cope, Thomas ; Beddows, David; Brough, Neil ; Jones, Anna E. ; Harrison, Roy; Lupi, Angelo ; Jun Yoon, Young; Virkkula, Aki ; Dall'Osto, Manuel.

In: Atmospheric Chemistry and Physics, Vol. 20, No. 7, 17.04.2020, p. 4461-4476.

Research output: Contribution to journalArticlepeer-review

Harvard

Lachlan-Cope, T, Beddows, D, Brough, N, Jones, AE, Harrison, R, Lupi, A, Jun Yoon, Y, Virkkula, A & Dall'Osto, M 2020, 'On the annual variability of Antarctic aerosol size distributions at Halley research station', Atmospheric Chemistry and Physics, vol. 20, no. 7, pp. 4461-4476. https://doi.org/10.5194/acp-20-4461-2020

APA

Lachlan-Cope, T., Beddows, D., Brough, N., Jones, A. E., Harrison, R., Lupi, A., Jun Yoon, Y., Virkkula, A., & Dall'Osto, M. (2020). On the annual variability of Antarctic aerosol size distributions at Halley research station. Atmospheric Chemistry and Physics, 20(7), 4461-4476. https://doi.org/10.5194/acp-20-4461-2020

Vancouver

Author

Lachlan-Cope, Thomas ; Beddows, David ; Brough, Neil ; Jones, Anna E. ; Harrison, Roy ; Lupi, Angelo ; Jun Yoon, Young ; Virkkula, Aki ; Dall'Osto, Manuel. / On the annual variability of Antarctic aerosol size distributions at Halley research station. In: Atmospheric Chemistry and Physics. 2020 ; Vol. 20, No. 7. pp. 4461-4476.

Bibtex

@article{aa1384c557714376b856f32a6e376700,
title = "On the annual variability of Antarctic aerosol size distributions at Halley research station",
abstract = "The Southern Ocean and Antarctic region currently best represent one of the few places left on our planet with conditions similar to the preindustrial age. Currently, climate models have a low ability to simulate conditions forming the aerosol baseline; a major uncertainty comes from the lack of understanding of aerosol size distributions and their dynamics. Contrasting studies stress that primary sea salt aerosol can contribute significantly to the aerosol population, challenging the concept of climate biogenic regulation by new particle formation (NPF) from dimethyl sulfide marine emissions.We present a statistical cluster analysis of the physical characteristics of particle size distributions (PSDs) collected at Halley (Antarctica) for the year 2015 (89 % data coverage; 6–209 nm size range; daily size resolution). By applying the Hartigan–Wong k-mean method we find eight clusters describing the entire aerosol population. Three clusters show pristine average low particle number concentrations (< 121–179 cm−3) with three main modes (30, 75–95 and 135–160 nm) and represent 57 % of the annual PSD (up to 89 %–100 % during winter and 34 %–65 % during summer based on monthly averages). Nucleation and Aitken mode PSD clusters dominate summer months (September–January, 59 %–90 %), whereas a clear bimodal distribution (43 and 134 nm, respectively; Hoppel minimum at mode 75 nm) is seen only during the December–April period (6 %–21 %). Major findings of the current work include: (1) NPF and growth events originate from both the sea ice marginal zone and the Antarctic plateau, strongly suggesting multiple vertical origins, including the marine boundary layer and free troposphere; (2) very low particle number concentrations are detected for a substantial part of the year (57 %), including summer (34 %–65 %), suggesting that the strong annual aerosol concentration cycle is driven by a short temporal interval of strong NPF events; (3) a unique pristine aerosol cluster is seen with a bimodal size distribution (75 and 160 nm, respectively), strongly associated with high wind speed and possibly associated with blowing snow and sea spray sea salt, dominating the winter aerosol population (34 %–54 %). A brief comparison with two other stations (Dome C – Concordia – and King Sejong Station) during the year 2015 (240 d overlap) shows that the dynamics of aerosol number concentrations and distributions are more complex than the simple sulfate–sea-spray binary combination, and it is likely that an array of additional chemical components and processes drive the aerosol population. A conceptual illustration is proposed indicating the various atmospheric processes related to the Antarctic aerosols, with particular emphasis on the origin of new particle formation and growth.",
author = "Thomas Lachlan-Cope and David Beddows and Neil Brough and Jones, {Anna E.} and Roy Harrison and Angelo Lupi and {Jun Yoon}, Young and Aki Virkkula and Manuel Dall'Osto",
year = "2020",
month = apr,
day = "17",
doi = "10.5194/acp-20-4461-2020",
language = "English",
volume = "20",
pages = "4461--4476",
journal = "Atmospheric Chemistry and Physics",
issn = "1680-7316",
publisher = "Copernicus Publications",
number = "7",

}

RIS

TY - JOUR

T1 - On the annual variability of Antarctic aerosol size distributions at Halley research station

AU - Lachlan-Cope, Thomas

AU - Beddows, David

AU - Brough, Neil

AU - Jones, Anna E.

AU - Harrison, Roy

AU - Lupi, Angelo

AU - Jun Yoon, Young

AU - Virkkula, Aki

AU - Dall'Osto, Manuel

PY - 2020/4/17

Y1 - 2020/4/17

N2 - The Southern Ocean and Antarctic region currently best represent one of the few places left on our planet with conditions similar to the preindustrial age. Currently, climate models have a low ability to simulate conditions forming the aerosol baseline; a major uncertainty comes from the lack of understanding of aerosol size distributions and their dynamics. Contrasting studies stress that primary sea salt aerosol can contribute significantly to the aerosol population, challenging the concept of climate biogenic regulation by new particle formation (NPF) from dimethyl sulfide marine emissions.We present a statistical cluster analysis of the physical characteristics of particle size distributions (PSDs) collected at Halley (Antarctica) for the year 2015 (89 % data coverage; 6–209 nm size range; daily size resolution). By applying the Hartigan–Wong k-mean method we find eight clusters describing the entire aerosol population. Three clusters show pristine average low particle number concentrations (< 121–179 cm−3) with three main modes (30, 75–95 and 135–160 nm) and represent 57 % of the annual PSD (up to 89 %–100 % during winter and 34 %–65 % during summer based on monthly averages). Nucleation and Aitken mode PSD clusters dominate summer months (September–January, 59 %–90 %), whereas a clear bimodal distribution (43 and 134 nm, respectively; Hoppel minimum at mode 75 nm) is seen only during the December–April period (6 %–21 %). Major findings of the current work include: (1) NPF and growth events originate from both the sea ice marginal zone and the Antarctic plateau, strongly suggesting multiple vertical origins, including the marine boundary layer and free troposphere; (2) very low particle number concentrations are detected for a substantial part of the year (57 %), including summer (34 %–65 %), suggesting that the strong annual aerosol concentration cycle is driven by a short temporal interval of strong NPF events; (3) a unique pristine aerosol cluster is seen with a bimodal size distribution (75 and 160 nm, respectively), strongly associated with high wind speed and possibly associated with blowing snow and sea spray sea salt, dominating the winter aerosol population (34 %–54 %). A brief comparison with two other stations (Dome C – Concordia – and King Sejong Station) during the year 2015 (240 d overlap) shows that the dynamics of aerosol number concentrations and distributions are more complex than the simple sulfate–sea-spray binary combination, and it is likely that an array of additional chemical components and processes drive the aerosol population. A conceptual illustration is proposed indicating the various atmospheric processes related to the Antarctic aerosols, with particular emphasis on the origin of new particle formation and growth.

AB - The Southern Ocean and Antarctic region currently best represent one of the few places left on our planet with conditions similar to the preindustrial age. Currently, climate models have a low ability to simulate conditions forming the aerosol baseline; a major uncertainty comes from the lack of understanding of aerosol size distributions and their dynamics. Contrasting studies stress that primary sea salt aerosol can contribute significantly to the aerosol population, challenging the concept of climate biogenic regulation by new particle formation (NPF) from dimethyl sulfide marine emissions.We present a statistical cluster analysis of the physical characteristics of particle size distributions (PSDs) collected at Halley (Antarctica) for the year 2015 (89 % data coverage; 6–209 nm size range; daily size resolution). By applying the Hartigan–Wong k-mean method we find eight clusters describing the entire aerosol population. Three clusters show pristine average low particle number concentrations (< 121–179 cm−3) with three main modes (30, 75–95 and 135–160 nm) and represent 57 % of the annual PSD (up to 89 %–100 % during winter and 34 %–65 % during summer based on monthly averages). Nucleation and Aitken mode PSD clusters dominate summer months (September–January, 59 %–90 %), whereas a clear bimodal distribution (43 and 134 nm, respectively; Hoppel minimum at mode 75 nm) is seen only during the December–April period (6 %–21 %). Major findings of the current work include: (1) NPF and growth events originate from both the sea ice marginal zone and the Antarctic plateau, strongly suggesting multiple vertical origins, including the marine boundary layer and free troposphere; (2) very low particle number concentrations are detected for a substantial part of the year (57 %), including summer (34 %–65 %), suggesting that the strong annual aerosol concentration cycle is driven by a short temporal interval of strong NPF events; (3) a unique pristine aerosol cluster is seen with a bimodal size distribution (75 and 160 nm, respectively), strongly associated with high wind speed and possibly associated with blowing snow and sea spray sea salt, dominating the winter aerosol population (34 %–54 %). A brief comparison with two other stations (Dome C – Concordia – and King Sejong Station) during the year 2015 (240 d overlap) shows that the dynamics of aerosol number concentrations and distributions are more complex than the simple sulfate–sea-spray binary combination, and it is likely that an array of additional chemical components and processes drive the aerosol population. A conceptual illustration is proposed indicating the various atmospheric processes related to the Antarctic aerosols, with particular emphasis on the origin of new particle formation and growth.

UR - http://www.scopus.com/inward/record.url?scp=85083773588&partnerID=8YFLogxK

U2 - 10.5194/acp-20-4461-2020

DO - 10.5194/acp-20-4461-2020

M3 - Article

VL - 20

SP - 4461

EP - 4476

JO - Atmospheric Chemistry and Physics

JF - Atmospheric Chemistry and Physics

SN - 1680-7316

IS - 7

ER -