Shipborne Observations of Surface Black Carbon Aerosol Mass Concentrations and Ozone/Methane/Carbon Monoxide/Carbon Dioxide Mixing Ratios in the Arctic Atmosphere
This dataset contains the observation data obtained aboard the research vessel Araon during its round-trip voyages to the Arctic Ocean. Specifically, the atmospheric mass concentrations of black carbon aerosols from the 2016 to 2020 cruises; and the atmospheric mixing ratios of ozone during the 2017 and 2018 cruises, and the atmospheric mixing ratios of methane, carbon monoxide, and carbon dioxide during the 2018 cruise.
|2016/07/21 - 2020/09/13
|NASA Ames Format 1001
|ver.2023-1.0 (Last updated: 2023/07/XX)
|black carbon aerosol mass concentration
|O3, CH4, CO, and CO2 mixing ratios
|2016/07/21 - 2020/09/13
|Latitude: 33.14 - 80.00°
Longitude: 125.56 - −134.95°
The air intake was set at the handrail of the front deck to avoid ship exhaust pollution. A cyclone was attached at the intake to selectively sample PM2.5 aerosols. Light absorption methods were used to measure the BC mass concentration: during the cruises in 2016–2019, a continuous soot monitoring system (COSMOS, model 3130, KANOMAX, Japan; 565 nm wavelength) with the inlet line heated to 400°C was used; during the 2020 cruise, an Aethalometer (model AE33, Magee Scientific Co., USA; 880 nm wavelength) was used. The Picarro G2401 gas concentration analyzer (Picarro, Inc., USA) was used to measure the mixing ratios of CH4, CO, and CO2, and the instrument was calibrated by running the standard CH4 gas (RIGAS, Korea) for 8 min every day. The mixing ratios of O3 were obtained using the O3 monitor (Model 1100, Dylec Inc., Japan), which utilized absorption at 253.7 nm emitted by a low-pressure mercury lump and was calibrated through intercomparison with a standard reference photometer (SRP) #2.
In 2016–2019 and 2020, BC mass concentrations measured at 1- and 5-min intervals were recorded, respectively. To avoid the influence of ship exhausts, we only used 1- or 5-min data records that occurred when the 1-min wind direction and speed relative to the ship's course were within ±60° of the bow and >3 m s-1, respectively, for continuous 10 min centered around the current 1- or 5-min data record. The hourly value was calculated only if there were more than 40 minutes of valid data records in an hour, by averaging the 1- or 5-min values in that hour. The raw CH4 mixing ratio data were first calibrated according to the standard CH4 gas. The CO and CO2 data during the CH4 calibration periods were omitted. These data were then averaged to 1-min time resolution. Finally, the 1-h mixing ratios of CH4, CO, and CO2 were derived in the same way as that of BC from the 1-min data. The mixing ratios of O3 were recorded at 1-min intervals. The 1-h O3 mixing ratio data were derived in the same way as that of BC. In addition, in 2017 and 2018, the 1-minute BC data observed south of 44.5°N latitude were further checked for ship exhaust pollution by the 1-minute O3 data before deriving hourly values. When O3 decreased and BC increased at the same time, both data were considered invalid.
|This research was supported by the Korea Institute of Marine Science & Technology (KIMST) funded by the Ministry of Oceans and Fisheries, Korea (grant no. 20210605, Korea-Arctic Ocean Warming and Response of Ecosystem, KOPRI).
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