Details

Autor(en) / Beteiligte

• Singh, Mohit
• Kondo, Yutaka
• Ohata, Sho
• Mori, Tatsuhiro
• Oshima, Naga
• Hyvärinen, Antti
• Backman, John
• Asmi, Eija
• Servomaa, Henri
• Schnaiter, Franz Martin
• Andrews, Elisabeth
• Sharma, Sangeeta
• Eleftheriadis, Kostas
• Vratolis, Stergios
• Zhao, Yongjing
• Koike, Makoto
• Moteki, Nobuhiro
• Sinha, P. R.

Titel

Mass absorption cross section of black carbon for Aethalometer in the Arctic

Ist Teil von

• Aerosol science and technology, 2024-05, Vol.58 (5), p.536-553

Ort / Verlag

New York: Taylor & Francis

Erscheinungsjahr

2024

Quelle

Taylor & Francis

Beschreibungen/Notizen

• Long-term measurements of the mass concentration of black carbon (BC) in the atmosphere (M BC ) with well-constrained accuracy are indispensable to quantify its emission, transport, and deposition. The aerosol light absorption coefficient (b abs ), usually measured by a filter-based absorption photometer, including an Aethalometer (AE), is often used to estimate M BC . The measured b abs is converted to M BC by assuming a value for the mass absorption cross section (MAC). Previously, we derived the MAC for AE (MAC (AE)) from measured b abs and independently measured M BC values at two sites in the Arctic. M BC was measured with a filter-based absorption photometer with a heated inlet (COSMOS). The accuracy of the COSMOS-derived M BC  (M BC  (COSMOS)) was within about 15%. Here, we obtained additional MAC (AE) measurements to improve understanding of its variability and uncertainty. We measured b abs (AE) and M BC  (COSMOS) at Alert (2018-2020), Barrow (2012-2022), Ny-Ålesund (2012-2019), and Pallas (2019-2022). At Pallas, we also obtained four-wavelength photoacoustic aerosol absorption spectrometer (PAAS-4λ) measurements of b abs . b abs (AE) and M BC  (COSMOS) were tightly correlated; the average MAC (AE) at the four sites was 11.4 ± 1.2 m 2 g −1 (mean ± 1σ) at 590 nm and 7.76 ± 0.73 m 2 g −1 at 880 nm. The spatial variability of MAC (AE) was about 11% (1σ), and its year-to-year variability was about 18%. We compared MAC (AE) in the Arctic with values at mid-latitudes, measured by previous studies, and with values obtained by using other types of filter-based absorption photometer, and PAAS-4λ. Copyright © 2024 American Association for Aerosol Research