Aerosol optical absorption coefficients at seven wavelengths in 10 min resolution measured in the Swiss container during MOSAiC 2019/2020

• Main Authors: Heutte, Benjamin, Beck, Ivo, Quéléver, Lauriane, Jokinen, Tuija, Laurila, Tiia, Dada, Lubna, Schmale, Julia
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: aerosol; Aerosol absorption at 370 nm; Aerosol absorption at 470 nm; Aerosol absorption at 520 nm; Aerosol absorption at 590 nm; Aerosol absorption at 660 nm; Aerosol absorption at 880 nm; Aerosol absorption at 950 nm; aerosol absorption coefficient; AETH; Aethalometer; AE33; Magee Scientific; Arctic aerosol; Arctic Ocean; DATE/TIME; Event label; Flag; pollution; LATITUDE; LONGITUDE; MOSAiC; MOSAiC_ATMOS; MOSAiC20192020; Multidisciplinary drifting Observatory for the Study of Arctic Climate; North Greenland Sea; Polarstern; PS122/1; PS122/1_1-82; PS122/2; PS122/2_14-11; PS122/3; PS122/3_28-27; PS122/4; PS122/4_43-21; PS122/5; PS122/5_58-18; black carbon; Greenland; Greenland Sea; North Greenland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.961756; https://doi.org/10.1594/PANGAEA.961756

This dataset contains aerosol optical absorption coefficients at seven different wavelengths (babs(λ)), averaged to 10 min time resolution, measured during the year-long MOSAiC expedition from October 2019 to September 2020. The measurements were performed in the Swiss container on the D-deck of Research Vessel Polarstern, using a commercial aethalometer (model AE33, Magee Scientific, Berkeley, USA). The instrument was located behind an automated valve, which switched hourly between a total and an interstitial air inlet, with upper cutoff sizes of 40 and 1 μm respectively. The inlet flow, 2 liters per minute, was verified biweekly. The dual spot technology of the instrument allowed for a real-time compensation of what is known as the loading effect (Drinovec et al., 2015). The instrument reports equivalent black carbon (eBC) mass concentrations at seven different wavelengths (370, 470, 520, 590, 660, 880, and 950 nm), computed from the measured light attenuation at each wavelength on the filter (equation (16) in Drinovec et al., 2015), with a 1 sec time resolution. The data obtained at 880 nm (channel 6: BC6) is the standard for reporting eBC concentrations (Drinovec et al., 2015), and are reported in Heutte et al. (2022). Here, we report the aerosol optical absorption coefficients at all seven wavelengths mentioned above, where the eBC (λ) concentrations were converted to optical absorption coefficients by multiplying them by the default mass absorption cross-section values of 18.47, 14.54, 13.14, 11.58, 10.35, 7.77, and 7.19 m2g-1 for the wavelengths 370, 470, 520, 590, 660, 880, and 950 nm, respectively. These optical absorption coefficients can be used for source apportionment or for the computation of the Absorption Ångström Exponent (AAE, Helin et al., 2021). The switching valve caused concentration spikes to be observed at the full hour, hence data points within ± 2 min of the full hour are removed. The dataset was averaged to 1 min time resolution (original time resolution is 1 second) to reduce the ...