Single-Channel Tricolour Absorption Photometer (STAP) measurements of aerosol absorption coefficients in summertime in Narsaq, South Greenland during Greenfjord 2023

Abstract and dataset contents: This dataset contains measurements of aerosol absorption coefficients at 450, 525 and 624 nm using a Single-channel Tricolour Absorption Photometer (STAP, Brechtel Manufacturing Inc. USA), which measures the attenuation of light through a sample filter at multiple wavelengths and compares this to a reference filter. Measurements were conducted at Narsaq International Research Station (NIRS), centrally located in Narsaq, Southern Greenland (lat: 60.9157503°, lon: -46.0533263°, alt: 17 m above sea level), during the Greenfjord campaign in June-August 2023. Metadata can be found in the file 'metadata_STAP.docx'. Briefly, the dataset files (Lv2_STAP.csv) include: Datetime Absorption coefficients at 450, 525 and 624 nm (M m-1) Pollution flag to inform data user when short-lived spikes can be found in the data from local anthropogenic pollution Inlet relative humidity (RH) flag to inform the data user when the RH in the inlet system reached over 40 % Filter usage flag to inform data user of the sample filter usage per wavelength due to different responses to filter loading at each wavelength Grounding flag to inform user when the instrument was not electrically grounded and therefore a larger signal-to-noise ratio is expected Funding acknowledgements: This work was supported by funding from the Swiss National Science Foundation grant no. 200021_212101, the Swiss Polar Institute grant no. SPI-FLAG-2021-002 Greenfjord, and the ENAC Flagship 2022 ECO-Plains.