Cloud Condensation Nuclei number concentrations over the Southern Ocean during the austral summer of 2016/2017.

• Main Authors: Tatzelt, Christian, Henning, Silvia, Tummon, Fiona, Hartmann, Markus, Baccarini, Andrea, Welti, André, Lehtipalo, Katrianne, Schmale, Julia
• Other Authors: Thomas, Jenny
• Format: Dataset
• Language: English
• Published: 2019
• Subjects: cloud condensation nuclei; CCN; aerosol particles; in-situ measurements; atmosphere; Southern Ocean; Antarctica; Antarctic Circumnavigation Expedition; ACE-SPACE; ACE; Antarctic; The Antarctic; Austral; Antarc*
• Online Access: https://zenodo.org/record/2636765; https://doi.org/10.5281/zenodo.2636765

Dataset abstract Cloud Condensation Nuclei (CCN) are a subclass of atmospheric aerosol particles, which can be activated to cloud droplets at a certain supersaturation, with respect to water. Due to their abundance, these particles can affect micro-physical properties of clouds, while acting as CCN. It was found that CCN are relevant for the Earth’s radiation budget, by affecting cloud albedo and lifetime. When giving a number concentration of CCN, also the supersaturation (SS) at which it was measured has to be given. Our dataset gives CCN number concentrations measured by a CCN counter (type CCN-100 by DMT, Boulder, US) operated at five different levels of supersaturation (SS=0.15%, 0.2%, 0.3%, 0.5%, 1%) during the Antarctic Circumnavigation Expedition (ACE) cruise over the Southern Ocean, as part of the ACE-SPACE project. Temporal coverage is from December 20, 2016 to March 19, 2017. We give 1-minute averaged and quality controlled CCN number concentrations. Dataset contents ACESPACE_cloud_condensation_nuclei_number_concentration_SS015.csv, data file, comma-separated values ACESPACE_cloud_condensation_nuclei_number_concentration_SS020.csv, data file, comma-separated values ACESPACE_cloud_condensation_nuclei_number_concentration_SS030.csv, data file, comma-separated values ACESPACE_cloud_condensation_nuclei_number_concentration_SS050.csv, data file, comma-separated values ACESPACE_cloud_condensation_nuclei_number_concentration_SS100.csv, data file, comma-separated values data_file_header.txt, metadata, text README.md, metadata, text The files listed above contain Cloud Condensation Nuclei (CCN) number concentration (N_CCN) values for the Antarctic Circumnavigation Expedition from in-situ measurements. Each file contains only N_CCN values for one of the five measured levels of supersaturation (SS): SS=0.15% in ACESPACE_cloud_condensation_nuclei_number_concentration_SS015.csv, SS=0.2% in ACESPACE_cloud_condensation_nuclei_number_concentration_SS020.csv etc. Values are from 1 Hz measurements and averaged to ...