New particle formation is globally one of the major sources of aerosol particles and cloud condensation nuclei. As primary emissions are a minor contributor to particle concentrations, secondary new particle formation processes are probably key in determining Antarctic aerosol number concentrations. However, our knowledge of new particle formation and its mechanisms in Antarctica is very limited. Here we study summertime open ocean and coastal new particle formation in the Antarctic Peninsula region based on both ship and station measurements. The rates of particle formation relative to sulfuric acid concentrations, as well as the sulfuric acid dimer-to-monomer ratios, were similar to those seen for sulfuric acid–dimethylamine–water nucleation. Numerous sulfuric acid–amine peaks were identified during new particle formation events, providing evidence that alkylamines were the bases that facilitated sulfuric acid nucleation. Most new particle formation events occurred in air masses arriving from the ice-covered Weddell Sea and its marginal ice zone, which are an important source of volatile sulfur and alkylamines. This nucleation mechanism is more efficient than the ion-induced sulfuric acid–ammonia pathway previously observed in Antarctica, and one that can occur rapidly under neutral conditions. This hitherto overlooked pathway to biologically driven aerosol formation should be considered for estimating aerosol and cloud condensation nuclei numbers in ocean–sea ice–aerosols–climate feedback models.
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We thank the Spanish Armada, and particularly the captains and crew of the BIO A-33 Hesperides, for their invaluable collaboration. We are also indebted to the UTM, and especially M. Ojeda, for logistic and technical support on the Antarctic Spanish BAE JC1. We also thank A. Sotomayor for help with mapping. This study was funded by the Spanish Ministry of Economy (grant number PI‐ICE‐CTM 2017–89117‐R and RYC-2012-11922, both awarded to M.D.’O.). This work was also supported by the National Centre for Atmospheric Science funded by the UK Natural Environment Research Council (grant number R8/H12/83/011 to R.M.H. and D.C.S.B., which also supported a studentship (ncasstu009) for J.B.).
The authors declare no competing interests.
Peer review information Nature Geoscience thanks the anonymous reviewers for their contribution to the peer review of this work. Primary Handling Editors: Clare Davis; Xujia Jiang.
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(a–d) correlations of each ammonia/amine measurement as the form (Am)(HNO3)NO3- and (Am)(HNO3)2NO3-, where Am is NH3, methylamine, C2 or C4 amine, coloured by date for (a) C2 amines, (b) C4 amines, (c) methylamine and (d) ammonia, and (e-f) mass spectral peak fits for C2 amine clustered with the nitrate dimer and trimer.
Bars corresponding to ‘Calc H2SO4 + MSA + HIO3’ and ‘Calc H2SO4’ represent the theoretical growth rate as calculated by ref. 46 due to several vapours, and H2SO4 respectively, the rightmost bars show growth rates calculated by the lognormal fitting method applied to NanoSMPS data. Errors on growth rates fitted to SMPS data are ±50%, errors on calculated growth rates are +100%/-50%.
Separated by NPF and non-NPF days, for (a) oxygenated organics, containing C5 and C6 oxygenated organics, (b) dicarboxylic acids, (c) iodic acid, (d) methanesulphonic acid, and (e) SO3- and SO5- ions. Shaded regions show 95% confidence regions on the mean.
showing (a) diurnals, where shaded region shows 1 standard deviation on the mean, (b) time series, and (c) mass spectra per factor. Data included 300 peaks between 150 – 400 m/Q for 1 week of CI-APi-ToF data. Q/Qexp for this solution = 1.004.
showing the measurement site (a) within Antarctica, and (b) within the Antarctic peninsula. BAE JC1 is the location for station measurements, and the coloured line shows the ship track, where red signifies that an NPF event was occurring.
Signals of gas phase H2SO4, MSA, HIO3, oxygenated organic molecules, C2 amines, and C4 amines. ‘NPF’ refers to periods where NPF was actively occurring (presuming a 0.5 nm h-1 growth rate below 4.5 nm), ‘Non NPF’ refers to the rest of the measurement period. Error bars represent 1 standard error on measured values.
Showing (a) time series, (b) diurnal cycles and (c) relative signals of a series of sulphuric acid clusters. Signals for the time series and diurnals have been normalised to a maximum of 1. Purple line shows the sulphuric acid dimer for comparison, and the black line shows the average of all these dimer peaks. Nucleation events occurred on 28/02 and 05/03.
Titles show the assigned cluster formula assigned to the red line. The purple and orange dashed line show unassigned peaks. The sum of these cluster and unknown peak fits is shown with the blue line, and the raw mass spectral data with the green points. Clusters seen with multiple nitrogen atoms are presumed to contain multiple bases.
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Brean, J., Dall’Osto, M., Simó, R. et al. Open ocean and coastal new particle formation from sulfuric acid and amines around the Antarctic Peninsula. Nat. Geosci. 14, 383–388 (2021). https://doi.org/10.1038/s41561-021-00751-y