Observational evidence for the formation of ocean DMS-derived aerosols during Arctic phytoplankton blooms
Ki-Tae Park1,*, Sehyun Jang1,*, Kitack Lee2, Young Jun Yoon1, Min-Seob Kim3, Kihong Park4, Hee-Joo Cho4, Jung-Ho Kang1, Roberto Udisti5, Bang-Yong Lee1, and Kyung-Hoon Shin61Korea Polar Research Institute, Incheon, 21990, Korea 2School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang, 37673, Korea 3Environment Measurement & Analysis Center, National Institute of Environmental Research, Incheon, 22689, Korea 4School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea 5Department of Chemistry, University of Florence, Florence, 50016, Italy 6Department of Marine Sciences and Convergent Technology, Hanyang University, Ansan 1588, Korea *These authors contributed equally to this work.
Received: 23 Dec 2016 – Accepted for review: 17 Jan 2017 – Discussion started: 18 Jan 2017
Abstract. The connection between marine biogenic dimethyl sulfide (DMS) and the formation of aerosol particles in the Arctic atmosphere was evaluated by analyzing atmospheric DMS mixing ratios, aerosol particle size distributions and aerosol chemical composition data that were concurrently collected at Ny-Ålesund, Svalbard (78.5° N, 11.8° E) during April and May 2015. Measurements of aerosol sulfur (S) compounds showed distinct patterns during periods of Arctic haze (April) and phytoplankton blooms (May). Specifically, during the phytoplankton bloom period the contribution of DMS-derived SO42− to the total aerosol SO42− increased by 7-fold compared with that during the proceeding Arctic haze period, accounting for up to 70 % of fine SO42− particles (< 2.5 µm in diameter). The results also showed that a sharp increase in the atmospheric DMS mixing ratio during Arctic phytoplankton bloom events was directly associated with the formation of sub-micrometer SO42− aerosols, and their subsequent growth to climate-relevant particles. Most importantly, two independent estimates of the formation of DMS-derived SO42− aerosols, calculated using the stable S isotope ratio and non-sea-salt SO42−/methanesulfonic acid ratio, respectively, were in close agreement, providing compelling evidence that the contribution of biogenic DMS to the formation of aerosol particles was substantial during the Arctic phytoplankton bloom period.
Park, K.-T., Jang, S., Lee, K., Yoon, Y. J., Kim, M.-S., Park, K., Cho, H.-J., Kang, J.-H., Udisti, R., Lee, B.-Y., and Shin, K.-H.: Observational evidence for the formation of ocean DMS-derived aerosols during Arctic phytoplankton blooms, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1161, in review, 2017.