edu.ucar.opensky::articles:25268 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T22:48:55.000140 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7qj7mxc https://doi.org/10.1594/PANGAEA.854411 https Related Dataset #1 Daily pan-Arctic sea-ice lead maps for 2003-2015, with links to maps in NetCDF format https://doi.org/10.5065/D6P8491K https Related Dataset #2 Aerosol measurements during OASIS Barrow field intensive Spring 2009, Version 1.0 https://doi.org/10.5065/D6RJ4GK6 https Related Dataset #3 Ozone, NOx, and NOy measurements during OASIS Barrow field intensive Spring 2009, Version 1.0 https://doi.org/10.5065/NMP7-EP60 https Related Dataset #4 CESM2.1/CAM-chem Instantaneous Output for Boundary Conditions https://doi.org/10.5281/zenodo.5654628 https Related Dataset #5 PACT-1D model version including polar halogen emissions - output files https://doi.org/10.5281/zenodo.6045999 https Related Software #1 PACT1D/PACT-1D-HALOGENS: PACT-1D model (v1.1) including polar chlorine and bromine emission mechanisms The role of snow in controlling halogen chemistry and boundary layer oxidation during Arctic spring: A 1D modeling case study 2022-03-16T00:00:00Z publication https://n2t.org/ark:/85065/d7qj7mxc https://doi.org/10.1029/2021JD036140 Ahmed, S. author Thomas, J. L. author Tuite, K. author Stutz, J. author Flocke, Frank M. author Orlando, John J. author Hornbrook, Rebecca author Apel, Eric C. author Emmons, Louisa K. author Helmig, D. author Boylan, P. author Huey, L. G. author Hall, Samuel R. author Ullmann, Kirk author Cantrell, C. A. author Fried, Alan author UCAR/NCAR - Library publisher Reactive chlorine and bromine species emitted from snow and aerosols can significantly alter the oxidative capacity of the polar boundary layer. However, halogen production mechanisms from snow remain highly uncertain, making it difficult for most models to include descriptions of halogen snow emissions and to understand the impact on atmospheric chemistry. We investigate the influence of Arctic halogen emissions from snow on boundary layer oxidation processes using a one-dimensional atmospheric chemistry and transport model (PACT-1D). To understand the combined impact of snow emissions and boundary layer dynamics on atmospheric chemistry, we model Cl-2 and Br-2 primary emissions from snow and include heterogeneous recycling of halogens on both snow and aerosols. We focus on a 2-day case study from the 2009 Ocean-Atmosphere-Sea Ice-Snowpack campaign at Utqia x121;vik, Alaska. The model reproduces both the diurnal cycle and high quantity of Cl-2 observed, along with the measured concentrations of Br-2, BrO, and HOBr. Due to the combined effects of emissions, recycling, vertical mixing, and atmospheric chemistry, reactive chlorine is typically confined to the lowest 15 m of the atmosphere, while bromine can impact chemistry up to and above the surface inversion height. Upon including halogen emissions and recycling, the concentration of HOx (HOx = OH + HO2) at the surface increases by as much as a factor of 30 at mid-day. The change in HOx due to halogen chemistry, as well as chlorine atoms derived from snow emissions, significantly reduce volatile organic compound lifetimes within a shallow layer near the surface. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2022 American Geophysical Union. None eng geoscientificInformation