DOI: 10.21336/gen.1
title: Time series of aerosol light-absorption coefficients from Aethalometers at six Arctic stations between 2012 and 2014

description: Data used in this article are archived and accessible from the EBAS database operated at the Norwegian Institute for Air Research (NILU) (http://ebas.nilu.no). Data management is provided by the WMO Global Atmosphere Watch World Data Centre for Aerosol. This project has received funding from the European Unions Horizon 2020 research and innovation programme under grant agreement No 654109 (ACTRIS). ALERT: Dr. Fred Hopper and technicians, and Canadian Department of National Defence. BARROW: NOAA Oceanic and Atmospheric Research SUMMIT: NOAA Oceanic and Atmospheric Research, National Science Foundation (OPP 1546002). TIKSI: Sara Morris and the NOAA Oceanic and Atmospheric Research, Academy of Finland project Greenhouse gas, aerosol and albedo variations in the changing Arctic (project number 269095) PALLAS: Academy of Finland project Greenhouse gas, aerosol and albedo variations in the changing Arctic (project number 269095), Academy of Finland project Novel Assessment of Black Carbon in the Eurasian Arctic: From Historical Concentrations and Sources to Future Climate Impacts (NABCEA), project number 296302 and the Academy of Finland Centre of Excellence program (project number 307331). ZEPPELIN: Swedish Environmental Protection Agency (Naturvaardsverket), Vetenskapraadet, FORMAS, and NILU - Norsk institutt for luftforskning.
description: DATA FILES AND SITE SPECIFIC CONTACTS: The files names are separated according to the stations where ALT = Alert, Canada, Sangeeta Sharma (sangeeta.sharma_at_canada.ca) BRW = Barrow, Alaska, USA, Patrick Sheridan (Patrick.Sheridan_at_noaa.gov) PAL = Pallas, Finland, John Backman (john.backman_at_fmi.fi) TIK = Tiksi, Russia, Taneil Uttal (Taneil.Uttal_at_noaa.gov), John Backman (john.backman_at_fmi.fi) SUM = Summit, Greenland, Denmark, Mike Bergin (michael.bergin_at_duke.edu), Patrick Sheridan (Patrick.Sheridan_at_noaa.gov) ZEP = Zeppelin, Svalbard, Norway, Krejci (Radovan.Krejci_at_aces.su.se), Konstantinos Eleftheriadis (elefther_at_ipta.demokritos.gr)
description: ALT: Aethalometer is connected to a hooded total aerosol inlet. The other instruments are connected to a PM10 inlet. The inlets are heated if needed to keep RH &lt; 40%. BRW: All instruments are connected to a PM10 inlet. The inlet is heated, if needed, to keep RH &lt; 40%. PAL: Aethalometer connected to a hooded total aerosol inlet whereas the MAAP and Nephelometer are connected to a PM2.5 inlet. The total aerosol inlets is headted if needed to avoid freezing and keep RH &lt; 40%. PM2.5 inlet sample is dried using a Naphion drier. TIK: All instruments connected to a PM10 inlet. The inlet is heated and the RH is generally below 30%. SUM: All instruments connected to a PM2.5 inlet. The inlet is heated, if needed, to keep RH &lt; 40%. ZEP: All instruments are connected to a inlet with no size cut. Sample air is heated to room temperature before reaching the instruments which typically keeps RH below 20%. All data are converted to standard temperature (273 K) and pressure (1013 hPa). File naming convention and data content: _atten_ = Light absorption coefficients b_ap(wl)nm [Mm-1] from Aethalometer data. Light absorption coefficients b_ap(wl)nm are obtained by dividing the light attenuation coefficients b_atn(wl)nm by 3.45 e.g. b_ap520nm = b_atn520nm/3.45 [Mm-1]. This is applied to the data in the file. _abs_ = Light absorption coefficients (b_ap(wl)nm [Mm-1]) obtained by the co-located light absorption photometers (PSAP, CLAP, or MAAP). _sca_ = Light scattering coefficients (b_sp(wl)nm [Mm-1]) measured by a TSI Inc. 3563 Nephelometer. _variable_ = Timebase is varied according to the amount of attenuation coefficients as measured by the respective Aethalometer. _onehour_ = Timebase is one hour for the data above. For aethalometer data, same values occur when concentration is low due to post processing as explained in the article related to this dataset. wl = wavelength of light For more information about the data processing, inlets, and instrumentation visit https://www.atmos-meas-tech-discuss.net/amt-2016-294/ which will redirect you to the revised verson of the article.