Dataset abstract The data set consists of the vertical profiles of the atmospheric variables measured using radiosondes (i-Met) during the Antarctic Circumnavigation Expedition from November 2016 to April 2017. The data include the raw variables measured directly by the radiosondes and derived parameters: altitude (km), air pressure (mb), air temperature (ºC), relative humidity (%), frostpoint (ºC), potential temperature (ºK), water vapour mixing ratio (ppmv), total column water (mm w.e.), wind speed (m/s) and wind direction (deg). Dataset contents aceNNN_yyyymmdd, directory aceNNN_yyyymmdd.csv, data file, comma-separated values aceNNN_yyyymmdd.kml, metadata, XML aceNNN_yyyymmdd.raw, data file, raw, ASCII DOS aceNNN_yyyymmdd.raw_config, metadata, XML aceNNN.de1, metadata, ASCII text format aceNNNflt.dat, data file, ASCII text format aceNNNpre.dat, data file, ASCII text format plots, directory Sounding_ACENNN.png, metadata, portable network graphics data_file_header_csv.txt, metadata, text format data_file_header_dat.txt, metadata, text format data_file_header_launches.txt, metadata, text format README.txt, metadata, text format overview_radiosonde_launches.csv, metadata, comma-separated value where NNN is the launch number yyyy is the year, mm is the month and dd is the day. Dates are in UTC. json files make up a Frictionless Data package. Dataset citation Please cite this dataset as: Gorodetskaya, I.V., Thurnherr, I., Tsukernik, M., Graf, P., Aemisegger, F., Wernli, H. and Ralph, F.M. (2021). Atmospheric profiling data collected from radiosondes in the Southern Ocean in the austral summer of 2016/2017 during the Antarctic Circumnavigation Expedition. (Version 1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.4382460

The Antarctic Circumnavigation Expedition was made possible by funding from the Swiss Polar Institute and Ferring Pharmaceuticals. The radiosonde programme was possible thanks a collaboration between Irina Gorodetskaya (CESAM, ACE project 18), Marty Ralph (Scripps Institute of Oceanography, UCSD) and Heini Wernli (ETHZ, ACE project 11) assuring the purchase of radiosondes, CLWC sensors, and accessories (balloons, de-reelers), and providing helium and ground equipment. We thank Emrys Hall and Dale Hurst (NOAA Global Monitoring Laboratory) for advice on i-Met-1 radiosonde performance. We are grateful to the crew of R/V Akademik Tryoshnikov for providing a mobile shelter for balloon preparation. We thank many ACE expedition participants who helped with launching the balloons. Special thanks to Guisella Gacitua for helping to find helium vendors in Punta Arenas. IG's participation in ACE was supported by ACE project 18 (PIs Katherine Leonard and Michael Lehning, EPFL) supported by grants from the SPI, the BNP Paribas Foundation, and the Swiss National Science Foundation (grant PZ00P2_142684). IG also thanks FCT/ MCTES for the financial support to CESAM (UIDP/50017/2020+UIDB/50017/2020) and FCT project ATLACE (CIRCNA/CAC/0273/2019) through national funds. IT and PG were supported by grants from the SPI and the BNP Paribas Foundation.

{"references": ["King, M. C. Bognar, J. A., Guest, D. and Bunt, F. (2016). Vibrating-Wire, Supercooled Liquid Water Content Sensor Calibration and Characterization Progress, Report NASA/TM\u20142016-219129, 6; National Aeronautics and Space Administration, Clevelend, Ohio, USA.", "David W H Walton, & Jenny Thomas. (2018, November 22). Cruise Report - Antarctic Circumnavigation Expedition (ACE) 20th December 2016 - 19th March 2017 (Version 1.0). Zenodo. https://doi.org/10.5281/zenodo.1443511", "Landwehr, S., Thomas, J., Gorodetskaya, I., Thurnherr, I., Robinson, C., and Schmale, J. (2019). Quality-checked meteorological data from the Southern Ocean collected during the Antarctic Circumnavigation Expedition from December 2016 to April 2017. Dataset. Zenodo. https://doi.org/10.5281/zenodo.3379590", "Hurst, D. F., Hall, E. G., Jordan, A. F., Miloshevich, L. M., Whiteman, D. N., Leblanc, T., Walsh, D., V\u00f6mel, H., and Oltmans, S. J. (2011). Comparisons of temperature, pressure and humidity measurements by balloon-borne radiosondes and frost point hygrometers during MOHAVE-2009, Atmos. Meas. Tech., 4, 2777\u20132793,\u00a0https://doi.org/10.5194/amt-4-2777-2011"]}