{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,16]],"date-time":"2026-03-16T22:27:01Z","timestamp":1773700021070,"version":"3.50.1"},"reference-count":162,"publisher":"Copernicus GmbH","issue":"7","license":[{"start":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T00:00:00Z","timestamp":1680739200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["n\/a"],"award-info":[{"award-number":["n\/a"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Atmos. Chem. Phys."],"abstract":"<jats:p>Abstract. The eastern North Atlantic (ENA) is a region dominated by pristine marine\nenvironment and subtropical marine boundary layer clouds. Under unperturbed\natmospheric conditions, the regional aerosol regime in the ENA varies seasonally\ndue to different seasonal surface-ocean biogenic emissions, removal\nprocesses, and meteorological regimes. However, during periods when the\nmarine boundary layer aerosol in the ENA is impacted by particles transported\nfrom continental sources, aerosol properties within the marine boundary\nlayer change significantly, affecting the concentration of cloud\ncondensation nuclei (CCN). Here, we investigate the impact of long-range\ntransported continental aerosol on the regional aerosol regime in the ENA using\ndata collected at the U.S. Department of Energy's (DOE) Atmospheric\nRadiation Measurement (ARM) user facility on Graciosa Island in 2017 during\nthe Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA) campaign. We develop an\nalgorithm that integrates number concentrations of particles with optical\nparticle dry diameter (Dp) between 100 and 1000\u2009nm, single scattering\nalbedo, and black carbon concentration to identify multiday events (with\nduration &gt;24 consecutive hours) of long-range continental\naerosol transport in the ENA. In 2017, we detected nine multiday events of\nlong-range transported particles that correspond to \u223c\u20097.5\u2009%\nof the year. For each event, we perform HYSPLIT 10\u2009d backward trajectories\nanalysis, and we evaluate CALIPSO aerosol products to assess, respectively,\nthe origins and compositions of aerosol particles arriving at the ENA site. Subsequently,\nwe group the events into three categories, (1) mixture of dust and marine\naerosols, (2) mixture of marine and polluted continental aerosols from\nindustrialized areas, and (3) biomass burning aerosol from North America and\nCanada, and we evaluate their influence on aerosol population and cloud\ncondensation nuclei in terms of potential activation fraction and\nconcentrations at supersaturation of 0.1\u2009% and 0.2\u2009%. The arrival of\nplumes dominated by the mixture of dust and marine aerosol in the ENA in the\nwinter caused significant increases in baseline Ntot. Simultaneously,\nthe baseline particle size modes and CCN potential activation fraction\nremained almost unvaried, while cloud condensation nuclei concentrations\nincreased proportionally to Ntot. Events dominated by a mixture of marine\nand polluted continental aerosols in spring, fall, and winter led to a\nstatistically significant increase in baseline Ntot, a shift towards\nlarger particular sizes, a higher CCN potential activation fractions, and\ncloud condensation nuclei concentrations of &gt;170\u2009% and up to\n240\u2009% higher than during baseline regime. Finally, the transported aerosol\nplumes characterized by elevated concentration of biomass burning aerosol\nfrom continental wildfires detected in the summertime did not statistically\ncontribute to increase baseline aerosol particle concentrations in the ENA.\nHowever, particle diameters were larger than under baseline conditions, and\nCCN potential activation fractions were &gt;75\u2009% higher.\nConsequentially, cloud concentration nuclei concentrations increased by\n\u223c\u2009115\u2009% during the period affected by the biomass burning\nevents. Our results suggest that, through the year, multiday events of\nlong-range continental aerosol transport periodically affect the ENA and\nrepresent a significant source of CCN in the marine boundary layer. Based on\nour analysis, in 2017, the multiday aerosol plume transport dominated by\na mixture of dust and marine aerosol, a mixture of marine and polluted\ncontinental aerosols, and biomass burning aerosols caused increases in the\nNCCN baseline regime of, respectively, 6.6\u2009%, 8\u2009%, and 7.4\u2009% at SS\n0.1\u2009% (and, respectively, 6.5\u2009%, 8.2\u2009%, and 7.3\u2009% at SS 0.2\u2009%) in the\nENA.<\/jats:p>","DOI":"10.5194\/acp-23-4221-2023","type":"journal-article","created":{"date-parts":[[2023,4,6]],"date-time":"2023-04-06T06:56:02Z","timestamp":1680764162000},"page":"4221-4246","source":"Crossref","is-referenced-by-count":9,"title":["Long-range transported continental aerosol in the eastern North Atlantic: three multiday event regimes influence cloud condensation nuclei"],"prefix":"10.5194","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4938-647X","authenticated-orcid":false,"given":"Francesca","family":"Gallo","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2001-0508","authenticated-orcid":false,"given":"Janek","family":"Uin","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4456-0918","authenticated-orcid":false,"given":"Kevin J.","family":"Sanchez","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2911-4469","authenticated-orcid":false,"given":"Richard H.","family":"Moore","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2815-4170","authenticated-orcid":false,"given":"Jian","family":"Wang","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1401-3828","authenticated-orcid":false,"given":"Robert","family":"Wood","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4285-2749","authenticated-orcid":false,"given":"Fan","family":"Mei","sequence":"additional","affiliation":[]},{"given":"Connor","family":"Flynn","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0159-4931","authenticated-orcid":false,"given":"Stephen","family":"Springston","sequence":"additional","affiliation":[]},{"given":"Eduardo B.","family":"Azevedo","sequence":"additional","affiliation":[]},{"given":"Chongai","family":"Kuang","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5749-7626","authenticated-orcid":false,"given":"Allison C.","family":"Aiken","sequence":"additional","affiliation":[]}],"member":"3145","published-online":{"date-parts":[[2023,4,6]]},"reference":[{"key":"ref1","doi-asserted-by":"crossref","unstructured":"Aiken, A., Gallo, F., Uin, J., Springston, S., Wang, J., Zheng, G., Kuang,\nC., McComiskey, A., Wood, R., Flynn, C., Theisen, A., Azevedo, E., Ortega,\nP., and Powers, H.: Eastern North Atlantic (ENA) Aerosol Supplementary Site\n(S1) Data Analysis Report, https:\/\/doi.org\/10.2172\/1567063, 2019.","DOI":"10.2172\/1572306"},{"key":"ref2","doi-asserted-by":"crossref","unstructured":"Albrecht, B. 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