Integrated Analysis of Airborne In-situ Cloud and Aerosol Microphysics Data during the 2022 Chemistry in the Arctic: Clouds, Halogens, and Aerosols (CHACHA) Field Campaign

The Chemistry in the Arctic: Clouds, Halogens, and Aerosols (CHACHA) field project featured a wide collaboration from six universities to enhance the scientific understanding of multiphase halogen chemistry in the Arctic that took place in Utqiaġvik, Alaska during February-April 2022. This project was spurred by the pursuit of strengthening our understanding of how Arctic Sea ice loss and fossil fuel extraction affects atmospheric halogen chemistry.

In this study, cloud flights from the University of Wyoming King Air are evaluated closely to assess the ambient conditions relevant to the Arctic boundary layer during flights targeting clouds emanating from open leads in the Arctic sea ice. During these flights, the Particle into Liquid Sampler (PILS) was utilized using a Roger’s inlet and Counterflow Virtual Impactor (CVI) with low volume (1.5 mL) samples being collected. This study aims to introduce a methodological basis for prioritizing samples and identifying samples that can be safely grouped together to maximize the chemical analysis possible. Instruments are used for this method include Aerosol microphysics data from instruments including Condensation Particle Counters (CPC), Portable Optical Particle Spectrometer (POPS), and Passive Cavity Aerosol Spectrometer Probe (PCASP) and cloud microphysics data from a Cloud Droplet Probe (CDP) and Two-Dimensional Stereo (2D-S). Ultimately, this work is a key step in chemical analysis of cloud flights that will be used to better understand multiphase Arctic halogen chemistry by constraining a Lagrangian chemical box model and cloud parcel modeling.