edu.ucar.opensky::articles:24503 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T06:30:05.238300 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7pn991g https://doi.org/10.5065/D65Q4T96 https Related Dataset #1 CSET: Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data. Version 1.3 https://doi.org/10.5065/D6M32TM9 https Related Dataset #2 SOCRATES: Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data. Version 1.3 https://doi.org/10.5065/D6Z036XB https Related Dataset #3 SOCRATES CCN measurements. Version 1.1 Influences of recent particle formation on southern ocean aerosol variability and low cloud properties 2021-04-27T00:00:00Z publication https://n2t.org/ark:/85065/d7pn991g https://doi.org/10.1029/2020JD033529 McCoy, I. L. author Bretherton, C. S. author Wood, R. author Twohy, C. H. author Gettelman, Andrew author Bardeen, Charles author Toohey, D. W. author UCAR/NCAR - Library publisher Controls on pristine aerosol over the Southern Ocean (SO) are critical for constraining the strength of global aerosol indirect forcing. Observations of summertime SO clouds and aerosols in synoptically varied conditions during the 2018 SOCRATES aircraft campaign reveal novel mechanisms influencing pristine aerosol-cloud interactions. The SO free troposphere (3-6 km) is characterized by widespread, frequent new particle formation events contributing to much larger concentrations (>= 1,000 mg(-1)) of condensation nuclei (diameters > 0.01 mu m) than in typical sub-tropical regions. Synoptic-scale uplift in warm conveyor belts and sub-polar vortices lifts marine biogenic sulfur-containing gases to free-tropospheric environments favorable for generating Aitken-mode aerosol particles (0.01-0.1 mu m). Free-tropospheric Aitken particles subside into the boundary layer, where they grow in size to dominate the sulfur-based cloud condensation nuclei (CCN) driving SO cloud droplet number concentrations (N-d similar to 60-100 cm(-3)). Evidence is presented for a hypothesized Aitken-buffering mechanism which maintains persistently high summertime SO N-d against precipitation removal through CCN replenishment from activation and growth of boundary layer Aitken particles. Nudged hindcasts from the Community Atmosphere Model (CAM6) are found to underpredict Aitken and accumulation mode aerosols and N-d, impacting summertime cloud brightness and aerosol-cloud interactions and indicating incomplete representations of aerosol mechanisms associated with ocean biology. 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 2021 American Geophysical Union. None eng geoscientificInformation