{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T02:56:22Z","timestamp":1760151382082,"version":"build-2065373602"},"reference-count":96,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2022,3,21]],"date-time":"2022-03-21T00:00:00Z","timestamp":1647820800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2019M3E7A1113103"],"award-info":[{"award-number":["2019M3E7A1113103"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Black carbon (BC) absorption aerosol optical depth (AAODBC) defines the contribution of BC in light absorption and is retrievable using sun\/sky radiometer measurements provided by Aerosol Robotic Network (AERONET) inversion products. In this study, we utilized AERONET-retrieved depolarization ratio (DPR, \u03b4p), single scattering albedo (SSA, \u03c9), and \u00c5ngstr\u00f6m Exponent (AE, \u00e5) of version 3 level 2.0 products as indicators to estimate the contribution of BC to the absorbing fractions of AOD. We applied our methodology to the AERONET sites, including North and South America, Europe, East Asia, Africa, India, and the Middle East, during 2000\u20132018. The long-term AAODBC showed a downward tendency over Sao Paulo (\u22120.001 year\u22121), Thessaloniki (\u22120.0004 year\u22121), Beijing (\u22120.001 year\u22121), Seoul (\u22120.0015 year\u22121), and Cape Verde (\u22120.0009 year\u22121) with the highest values over the populous sites. This declining tendency in AAODBC can be attributable to the successful emission control policies over these sites, particularly in Europe, America, and China. The AAODBC at the Beijing, Sao Paulo, Mexico City, and the Indian sites showed a clear seasonality indicating the notable role of residential heating in BC emissions over these sites during winter. We found a higher correlation between AAODBC and fine mode AOD at 440 nm at all sites except for Beijing. High pollution episodes, BC emission from different sources, and aggregation properties seem to be the main drivers of higher AAODBC correlation with coarse particles over Beijing.<\/jats:p>","DOI":"10.3390\/rs14061510","type":"journal-article","created":{"date-parts":[[2022,3,21]],"date-time":"2022-03-21T21:48:42Z","timestamp":1647899322000},"page":"1510","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Retrieval of Black Carbon Absorption Aerosol Optical Depth from AERONET Observations over the World during 2000\u20132018"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7995-2853","authenticated-orcid":false,"given":"Naghmeh","family":"Dehkhoda","sequence":"first","affiliation":[{"name":"Division of Earth Environmental System Science, Pukyong National University, Busan 48513, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5220-2489","authenticated-orcid":false,"given":"Juhyeon","family":"Sim","sequence":"additional","affiliation":[{"name":"Division of Earth Environmental System Science, Pukyong National University, Busan 48513, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3727-8239","authenticated-orcid":false,"given":"Sohee","family":"Joo","sequence":"additional","affiliation":[{"name":"Division of Earth Environmental System Science, Pukyong National University, Busan 48513, Korea"}]},{"given":"Sungkyun","family":"Shin","sequence":"additional","affiliation":[{"name":"Division of Climate & Environmental Research, Seoul Institute of Technology, Seoul 03909, Korea"}]},{"given":"Youngmin","family":"Noh","sequence":"additional","affiliation":[{"name":"Department of Environmental Engineering, Pukyong National University, Busan 48513, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"181","DOI":"10.5194\/acp-19-181-2019","article-title":"Modelling black carbon absorption of solar radiation: Combining external and internal mixing assumptions","volume":"19","author":"Curci","year":"2019","journal-title":"Atmos. 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