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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Jan 2019

Research article | 02 Jan 2019

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Large increases in Ncn and Nccn together with a nucleation-modeparticle pool over the northwestern Pacific Ocean in the spring of 2014

Juntao Wang1, Yanjie Shen1, Kai Li2, Yang Gao1,3, Huiwang Gao1,3, and Xiaohong Yao1,3 Juntao Wang et al.
  • 1Key Lab of Marine Environmental Science and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
  • 2National Marine Environmental Forecasting Center, Beijing, 100081, China
  • 3Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

Abstract. The updated concentrations of atmospheric particles (Ncn) and the concentrations of cloud condensation nuclei (Nccn) over the northwestern Pacific Ocean (NWPO) were important to accurately evaluate the influence of aerosol outflow from the Asian continent on the climate by considering rapid changes in emissions of air pollutants therein. However, field observations were scarce in the last two decades. We conducted a cruise campaign over the NWPO to simultaneously measure Ncn, Nccn and the size distribution of aerosol particles from DOY 81 to DOY 108 of 2014. The mean values of Nccn at supersaturation (SS) of 0.2 % and 0.4 % were 0.68 ± 0.38×103 cm−3 and 1.1 ± 0.67×103 cm−3, respectively, with an average for Ncn of 2.8 ± 1.0×103 cm−3 during the cruise over the NWPO, which were all approximately one order of magnitude larger than spring observations from two decades ago in the atmosphere of remote marine areas. The higher values, against the marine natural background reported in the literature, implied an overwhelming contribution from continental inputs. The calculated CCN activity ratios were 0.30 ± 0.11 and 0.46 ± 0.19 at SS of 0.2 % and 0.4 %, respectively, which were almost the same as those of upwind semi-urban sites. High Nccn and CCN activities were observed from DOY 98 to 102, when the oceanic zone received even stronger continental inputs. During the whole cruise period with the exclusion of biomass burning and dust aerosols, a good correlation between Nccn at 0.4 % SS and the number concentrations of > 60 nm particles (N> 60 nm), with the slope of 0.98 and R2 = 0.94, was obtained, and the corresponding effective hygroscopicity parameter (k) was estimated as 0.40. The bimodal size distribution pattern of the particle number concentration was generally observed during the entire campaign when the N> 90 nm varied largely. However, the N< 30 nm, accounting for approximately 1 / 3 of the total number concentration, varied narrowly, and two NPF events associated with vertical transport were observed, implying a pool of nucleation mode atmospheric particles aloft. Biomass burning (BB) and dust events were observed over the NWPO, but the contributions of BB and dust aerosols to Ncn and Nccn were minor (i.e., 10 % or less) on the monthly time scale.

Juntao Wang et al.
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Juntao Wang et al.
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Short summary
In this paper, we studied the spatiotemporal variability of Ncn and particle number size distributions, as well as Nccn and CCN activities over the NWPO in the spring of 2014. Several new findings have been revealed and discussed, e.g., large increases of Ncn and Nccn, against historical data and small contributions of dust and BB aerosols to Ncn and Nccn on the monthly time scale, etc. This work may help understand the influence of the current outflow from the Asian continent on the climate.
In this paper, we studied the spatiotemporal variability of Ncn and particle number size...