http://bolin.su.se/data/zeppelin-aerosol-light-scattering-1 Dominic Heslin-Rees, Maria Burgos, Hans-Christen Hansson, Radovan Krejci, Johan Ström, Peter Tunved, Paul Zieger Bolin Centre Database 2020 Datafile Atmosphere Aerosols Light scattering Ångström exponent Long-term trend Sea ice Back trajectory Arctic Zeppelin Svalbard Earth science > Atmosphere > Aerosols > Aerosol optical depth/thickness > Angstrom exponent Dominic Heslin-Rees 2020-10-05T09:33:54+00:00 English 1 This dataset is provided as one CSV file (size: 8.71 MB, 49031 rows, 31 columns). Each row represents an observation identified by the time stamp in the format YYYY-MM-DD hh:mm:ss. Several parameters report values for the planetary boundary layer (PBL). Details about the parameters by column label: - scat550: volume scattering coefficient in air due to dried aerosol particles, in [Mm-1] - bscat550: volume backwards scattering coefficient in air due to dried aerosol particles, in [Mm-1] - ratio_550: backscattering_ratio, unitless - AE_450: Ångström exponent of ambient aerosol in air, unitless - RH_int: the percentage of relative humidity at the sample outlet, in [%] - rH: the percentage of relative humidity at Zeppelin mountain (Ny-Ålesund), in [%] - average_alt_in_PBL: mean altitude of air parcel along trajectory and within PBL, in [m] - average_lat_in_PBL: mean latitude of air parcel along trajectory and within PBL, in [°N] - average_lon_in_PBL: mean longitude of air parcel along trajectory and within PBL, in [°E] - average_wind_speed_PBL: mean wind speed of air parcel along trajectory and within PBL, in [ms-1] - distance_in_PBL: mean distance traversed by air parcel along trajectory and within PBL, in [m] - mixed_layer_height_in_PBL: mean height of the PBL above the surface, in [m] - position_in_PBL: region of origin based on average back trajectory coordinates namely NE, SE, SW, NW - position_lon_in_PBL: average coordinate of back trajectory relative to ZEP at the North pole, in [°E] - rainfall_in_PBL: accumulated rainfall along the back trajectory whilst in PBL, in [mm] - relative_humidity_in_PBL: mean relative humidity of air parcel along trajectory and within PBL, in [%] - temperature_in_PBL: mean temperature of air parcel along trajectory and within PBL, in [°C] - time_in_PBL: time back trajectory spends within the PBL, in [h] - ice_time: time back trajectory spends within the PBL and over sea ice concentrations greater than 0.85, in [h] - land_time: time back trajectory spends within the PBL and continental surfaces, in [h] - ocean_time: time back trajectory spends within the PBL and over sea ice concentrations less than 0.85, in [h] - ice_time_fixed: time back trajectory spends within the PBL and over sea ice concentrations greater than 0.85 from 1999, in [h] - land_time_fixed: time back trajectory spends within the PBL and continental surfaces, in [h] - ocean_time_fixed: time back trajectory spends within the PBL and over sea ice concentrations less than 0.85 from 1999, in [h] - ordinal: number of days since 1999-01-01 - month_num: month of the year given as a number - month_abb: month of the year given as an abbreviation - year_num: year - season_abb: season of the year given as an abbreviation (i.e. DJF, MAM, JJA, SON) - year_month_num: number of months since January 1999 - season_ordinal: number of seasons since winter (DJF) 1999 The dataset also includes a jpg image file showing the source attribution of air masses using a back trajectory arriving at the Zeppelin Observatory. Dominic Heslin-Rees performed data analysis. Peter Tunved performed trajectory calculations. Hans-Christen Hansson and Johan Ström were part of the start up and operation of the long-term measurements.