http://bolin.su.se/data/zeppelin-ebc-2015-2019-1 Linn Karlsson, Radovan Krejci, Paul Zieger Bolin Centre Database 2023 Datafile Atmosphere Aerosols Aerosols Clouds Black carbon Arctic Zeppelin Svalbard Scavenging Earth science > Atmosphere > Aerosols Paul Zieger 2023-08-21T11:09:12+00:00 English 1 Equivalent black carbon (eBC) concentrations were measured behind a whole-air and a counterflow virtual impactor (CVI) inlet using two identical Multi-Angle Absorption Photometer instruments (MAAP, Thermo Fisher Scientific, Germany, Model 5012) . The data was recorded from November 2015 until November 2019 at the Zeppelin Observatory, Svalbard, located at 485 m above sea level. More details on the observatory can be found in Platt et al. (2022). Within the MAAP, particles are deposited on a filter and the attenuation and scattering of monochromatic light is measured simultaneously. The instrument delivers eBC concentrations (see Petzold and Schönlinner, 2004, for more technical details). The whole-air inlet measures eBC of interstitial aerosol and cloud particles, while the CVI only samples the cloud particles. Within the CVI, the particles are then dried and the eBC concentration is measured. The CVI data is corrected for enrichment and sampling efficiency as described by Karlsson et al. (2021). The data are provided in one comma-separated values (`csv`) file with the following content: * `time`: Date and time (UTC) in the format yyyy-mm-dd HH:MM:SS * `CVI_status`: Status of CVI (on, off or switching) * `BC_cvi`: Equivalent black carbon concentration (unit: microgram per cubic meter) measured by MAAP1 (during clouds it measures behind the CVI, during non-cloudy periods it measured behind the whole-air inlet) * `z`: Updraft velocity (unit: meter per second) measured by an ultra-sonic anemometer (Metek GmbH, Germany, Model Sonic-3 Omni) * `BC_tot`: Equivalent black carbon concentration (unit: microgram per cubic meter) measured by MAAP2 measured behind whole-air inlet * `flag`: Data quality (good or bad). Bad data should not be used (e.g. due to inlet switching) * `visibility`: Visibility (unit: meter) measured by the CVI inlet's visibility sensor The time resolution is 1-min. The eBC concentrations are given at ambient conditions and are stated as outputted by the instrument (no corrections due to differences in wavelengths applied). Please note that the eBC-concentrations during cloudy periods (CVI on) are corrected by the CVI sampling enrichment factor and sampling efficiency. File size: 114.5 MB Number of rows, including header: 2107356 More info can be found in Zieger et al. (2023, in review). Please cite and consult Zieger et al. (2023) when using these data.