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- W4226054013 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The impact of aerosols on clouds is a well-studied, although still poorly constrained, part of the atmospheric system. New particle formation (NPF) is thought to contribute 40â%â80â% of the global cloud droplet number concentration, although it is extremely difficult to observe an air mass from NPF to cloud formation. NPF and growth occurs frequently in the Canadian Arctic summer atmosphere, although only a few studies have characterized the source and properties of these aerosols. This study presents cloud condensation nuclei (CCN) concentrations measured on board the <i>CCGS Amundsen</i> in the eastern Canadian Arctic Archipelago from 23 July to 23 August 2016 as part of the Network on Climate and Aerosols: Addressing Uncertainties in Remote Canadian Environments (NETCARE). The study was dominated by frequent ultrafine particle and/or growth events, and particles smaller than 100ânm dominated the size distribution for 92â% of the study period. Using <span class=inline-formula><i>κ</i></span>-Köhler theory and aerosol size distributions, the mean hygroscopicity parameter (<span class=inline-formula><i>κ</i></span>) calculated for the entire study was 0.12 (0.06â0.12, 25thâ75th percentile), suggesting that the condensable vapours that led to particle growth were primarily slightly hygroscopic, which we infer to be organic. Based on past measurement and modelling studies from NETCARE and the Canadian Arctic, it seems likely that the source of these slightly hygroscopic, organic, vapours is the ocean. Examining specific growth events suggests that the mode diameter (<span class=inline-formula><i>D</i><sub>max</sub></span>) had to exceed 40ânm before CCN concentrations at 0.99â% supersaturation (SS) started to increase, although a statistical analysis shows that CCN concentrations increased 13â274âcm<span class=inline-formula><sup>â3</sup></span> during all ultrafine particle and/or growth times (total particle concentrationsâ<span class=inline-formula>>500</span>âcm<span class=inline-formula><sup>â3</sup></span>, <span class=inline-formula><i>D</i><sub>max</sub><100</span>ânm) compared with background times (total concentrationsâ<span class=inline-formula><500</span>âcm<span class=inline-formula><sup>â3</sup></span>) at SS of 0.26â%â0.99â%. This value increased to 25â425âcm<span class=inline-formula><sup>â3</sup></span> if the growth times were limited to times when <span class=inline-formula><i>D</i><sub>max</sub></span> was also larger than 40ânm. These results support past results from NETCARE by showing that the frequently observed ultrafine particle and growth events are dominated by a slightly hygroscopic fraction, which we interpret to be organic vapours originating from the ocean, and that these growing particles can increase the background CCN concentrations at SS as low as 0.26â%, thus pointing to their potential contribution to cloud properties and thus climate through the radiation balance." @default.
- W4226054013 created "2022-05-05" @default.
- W4226054013 creator A5041718332 @default.
- W4226054013 date "2022-04-08" @default.
- W4226054013 modified "2023-10-01" @default.
- W4226054013 title "Comment on acp-2021-899" @default.
- W4226054013 doi "https://doi.org/10.5194/acp-2021-899-ac1" @default.
- W4226054013 hasPublicationYear "2022" @default.
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