1. ABOUT THE DATASET -------------------- Title: Dataset associated with “Ice-nucleating particle and cloud ice crystal concentrations associated with developing summertime deep convective clouds in south-western USA” by Daily et al, 2026 Creator(s): Martin I. Daily(1), Joseph Robinson(1), Declan Finney(1), Erin Raif(1), James B. McQuaid(1), Kezhen Hu (2), Gary Lloyd (2), Benjamin J Murray(1) and Alan Blyth(1) Organisation(s): 1. University of Leeds, 2. University of Manchester Rights-holder(s): Copyright 2026 University of Leeds Publication Year: 2026 Description: Aerosol filter and cloud ice crystal concentration data collected from the UK’s FAAM airborne laboratory BAe-146 aircraft as part of the 2022 DCMEX campaign in New Mexico, USA. The dataset contains the filter sampling metadata, INP concentrations (both concentrations and freezing temperatures obtained in the experiments from sampling runs and handling blanks) and SEM-EDS data (size distributions from both SEM and optical probes, as well as EDS size-resolved composition fractions). Also contained are the cloud penetration and ice crystal number concentration data collected using an underwing HVPS-3 hydrometer imaging probe. This is an updated dataset which supersedes the previously uploaded dataset: Daily et. al., 2024: Dataset for Airborne observations of ice-nucleating particles during the 2022 DCMEX campaign, New Mexico. [Dataset] (https://doi.org/10.5518/1476). Cite as: Martin I. Daily, Joseph Robinson, Declan Finney, Erin Raif, James B. McQuaid, Kezhen Hu, Gary Lloyd, Benjamin J Murray and Alan Blyth (2026): Dataset associated with “Ice-nucleating particle and cloud ice crystal concentrations associated with developing summertime deep convective clouds in south-western USA” https://doi.org/10.5518/1815 Contact: Martin I. Daily, m.i.daily@leeds.ac.uk / Ben J. Murray, b.j.murray@leeds.ac.uk Related publication: This is the data presented and analysed in Martin I. Daily, Joseph Robinson, Declan L. Finney, Erin N. Raif, James B. McQuaid, Alberto Sanchez-Marroquin, Kezhen Hu, Gary Lloyd, Michael Flynn, Paul R. Field, Keith N. Bower, Hugh Coe, Martin W. Gallagher, Alan M. Blyth and Benjamin J. Murray (2026): “Ice-nucleating particle and cloud ice crystal concentrations associated with developing summertime deep convective clouds in south-western USA”, Journal of Geophysical Research (Atmospheres), DOI: 10.1029/2024JD043236. 2. TERMS OF USE --------------- Copyright 2026 University of Leeds. Unless otherwise stated, this dataset is licensed under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/. 3. PROJECT AND FUNDING INFORMATION ---------------------------------- Title: DCMEX -- Deep Convective Microphysics Experiment Dates: 1 Feb 2020 - 31 Mar 2025 Funding organisation: Natural Environment Research Council Grant no.: NE/T014849/1, NE/T006420/1 and NE/T006439/1 4. CONTENTS ----------- File listing (and Figure/Table in Daily et al, 2026 the data corresponds to): - 01_filters_metadata.csv (Table A1): This file contains metadata for each aerosol run and the filters collected during them including: date, time of start and end of run, mean altitude during run (metres above sea level), volume of air sampled (litres), mean air sampling rate (litres/min). - 02_PTFE_raw_droplet_ff.csv (Fig 3): Droplet freezing assay results for sampling run PTFE filters (droplet freezing temperatures and fraction of droplets frozen) - 03_polycarbonate_raw_droplet_ff.csv (Fig 3): Droplet freezing assay results for sampling run polycarbonate filter (droplet freezing temperatures and fraction of droplets frozen) - 04_PTFE_raw_droplet_ff_handlingblank.csv. (Fig 3): Droplet freezing assay results for handling blank PTFE filters (droplet freezing temperatures and fraction of droplets frozen) - 05_polycarbonate_raw_droplet_ff_handlingblank.csv (Fig 3). Droplet freezing assay results for handling blank polycarbonate filters (droplet freezing temperatures and fraction of droplets frozen) - 06_ PTFE_INP_concentrations.csv (Figs 4, 5, 9, B1, S1, S8, S9): Calculated INP concentrations with errors (per standard litre of air) of PTFE filter runs after background subtraction process, binned in 0.5 degree Celsius intervals - 07_ polycarbonate_INP_concentrations (Figs 4, 5, 9, B1, S1, S8, S9): Calculated INP concentrations with errors (per standard litre of air) of polycarbonate filter runs after background subtraction process, binned in 0.5 degree Celsius intervals - 08_SEM_particlesizedist.csv (Fig 7): Binned aerosol particle size distribution (dnlogDp/logDp) in the range 0.3 – 20 micrometres, with errors, derived from scanning electron microscope analysis of selected polycarbonate filters. - 09_SEM_sizedcomposition.csv (Fig 7): Tables of binned fractional composition of aerosol in the range 0.3 – 20 micrometres, derived from scanning electron microscope analysis of selected polycarbonate filters. -10_HVPS_ICNC_data.csv (Fig 9): ICNC data (L-1) and out-of-cloud temperature (degrees Celsius) from HVPS probe for each cloud penetration run, with errors, adjusted to standard temperature and pressure. -11_N-INP2_curve_parameters.csv (Fig S1, S8): Fitting parameters for the N-INP2 component of the INP parameterisation curves for the DCMEX campaign – parameters a, b and c are shown for each individual filter run and for the geometric mean fit to all filter runs. 5. METHODS ---------- - Filter collection: Collected using the dual filter inlet sampling system on the BAe-146 FAAM research aircraft. Filters were collected during aerosol runs, during which the aircraft was flying level and at constant altitude in cloud-free air. Typically a pair of filters, one Teflon (PTFE) 1.2 micrometre pore size and one polycarbonate 0.4 micrometre pore size was taken during each filter run. - Ice nucleating particle (INP) concentrations: These were generated from PTFE filter aerosol samples collected on board of the BAe-146 FAAM research aircraft. The filters were analysed using a droplet freezing assay on a Nucleation by Immersed Particle Instrument (NIPI, Whale et al., 2015). Teflon filter droplet assays used a ‘drop-on’ technique (Price et al., 2018) while polycarbonate filters were washed into a suspension. - SEM-EDS size-resolved composition and particle size distribution. This data was generated using aerosol samples collected on top of polycarbonate filters on board of the BAe-146 FAAM research aircraft. The filters were analysed using our SEM-EDS approach (Sanchez-Marroquin et al., 2019). Each particle detected by the microscope software was sized and analysed for fractional elemental composition by EDS, then classified post-hoc by a previously published algorithm (Sanchez-Marroquin et al., 2019). - Ice crystal number concentrations (ICNC) during cloud penetration passes generated using a High Volume Precipitation Spectrometer-3 probe, mounted on the underwing pylon of the BAe-146 aircraft. For fuller descriptions of these methodologies, please refer to Section 3 of Daily et al, 2026.