Indirect measurements of the composition of ultrafine particles in the Arctic late-winter ...

• Main Authors: Myers, Deanna, Smith, James
• Format: Dataset
• Language: English
• Published: Dryad 2021
• Subjects: Atmospheric chemistry; Particle size distribution; hygroscopic growth; ultrafine particle; arctic particle; Arctic; Arctic Ocean; Barrow; Sea ice; Alaska
• Online Access: https://dx.doi.org/10.7280/d15x1j; https://datadryad.org/stash/dataset/doi:10.7280/D15X1J

We present indirect measurements of size-resolved ultrafine particle composition conducted during the Ocean–Atmosphere–Sea Ice–Snowpack (OASIS) Campaign in Utqiagvik, Alaska, during March 2009. This study focuses on measurements of size-resolved particle hygroscopicity and volatility measured over two periods of the campaign. During a period that represents background conditions in this location, particle hygroscopic growth factors (HGF) at 90% relative humidity ranged from 1.45-1.51, which combined with volatility measurements suggest a mixture of ~30% ammoniated sulfates and ~70% oxidized organics. Two separate regional ultrafine particle growth events were also observed during this campaign. Event 1 coincided with elevated levels of H2SO4 and solar radiation. These particles were highly hygroscopic (HGF=2.1 for 35 nm particles), but were almost fully volatilized at 160 °C. The air masses associated with both events originated over the Arctic Ocean. Event 1 was influenced by the upper marine boundary layer ... : Data was collected from 5 March - 19 April during Ocean - Atmosphere - Sea Ice - Snowpack (OASIS) Campaign in Utqiagvik, Alaska at the U.S. Naval Arctic Research Laboratory (NARL) and near the Barrow Arctic Research Center (BARC). Times are listed in Alaska Daylight Time (UTC - 8 hours). ...