This dataset contains mesospheric ozone (O3) data acquired by the ground-based British Antarctic Survey''s Microwave Radiometer at Troll (BAS-MRT) in Antarctica (72 deg S, 2.5 deg E, 1270 amsl). The BAS radiometer has been designed in order to study the effects of energetic particle precipitation on the middle and upper atmosphere, using nitric oxide and ozone measurements, and the dynamical context using CO. This data set contains the O3 measurements. The data set covers the period from February 2008 to January 2010. O3 is measured for approximately 20 hours each day and profiles are retrieved every hour. The retrieved profiles cover the pressure range from 3 to 0.02 hPa (approximately 38 to 72 km), with an altitude resolution that varies from 10 km at 3 hPa (39 km) to 18 km at 0.7 hPa (66~km).

Monthly averaged total ozone values measured at Halley station, Antarctica. All measurements are in Dobson Units. These monthly averages are a flat average of any daily average values that exist for each given month; the daily averages are a flat average of the measurements obtained during a particular 24-hour period (UTC). The number of observations may vary from day to day. The Dobson ozone observing season at Halley begins at the end of August and ends in mid April; however, very early and late season observations are made with the Sun at low elevation, and are less accurate than those made during the main observing period of September 6 to April 6. The values for 1956/57 (MacDowall, J., 1962) and 1957-1973 (Farman, J. C. and Hamilton, R. A., 1975) have been approximately corrected from the original using the WMO recommended guidance (Komhyr, W. D., Mateer C. L. and Hudson, R. D., 1993) for the Bass-Paur ozone absorption coefficients. Ozone values from 1973 onwards have been calculated using the Bass-Paur coefficients. The approximation of a US standard atmosphere, which will differ from the Antarctic atmosphere, has been used and the assumed temperature used for the absorption coefficients may be inaccurate.

Atmospheric nitrous acid (HONO) amount fraction measured in the clean air sector at Halley VI Research Station between 22 January and 3 February 2022. The data was collected using a Long Path Absorption Photometer (LOPAP), the instrument inlet height above the snow was changed during the measurement period, this is indicated in the dataset. Temperature and wind speed data were collected are included to enable the HONO flux from the snow to be calculated. This work was supported by the Natural Environment Research Council and the ARIES Doctoral Training Partnership [grant number NE/S007334/1]. The fieldwork at Halley VI Research Station was funded by the Collaborative Antarctic Science Scheme (CASS).

These data files contain the records of isotopes, anions, cations and organic compounds measured in the Bouvet Island ice core. The Bouvet ice core was collected as part of the Antarctic Circumnavigation Expedition (ACE) 2016-2017, and is the first ever ice core collected on the island. All analyses was carried out at the British Antarctic Survey, Cambridge, United Kingdom between 2016 and 2018. Analyses were carried out by analytical staff and a PhD student. Isotopes were measured using a Picarro instrument, anions and cations on a Dionex Intergrion Ion Chromatograph, and organics using High-Performance Liquid Chromotography Mass Spectrometry (HPLC-MS). Isotopes, anions and cations are measured as discreet 5cm core samples, while organics are measured at annual resolution core samples. This data forms part of a suite of ice cores from the sub-Antarctic islands collected on the ACE cruise 2016-2017, for which anion, cation and isotope data will be made available separately. Funding source Work by Amy King was jointly supported by Selwyn College, Cambridge, and the NERC Doctoral Training Programme [grant number NE/L002507/1]. ACE and Elizabeth Thomas received funding from Ecole Polytechnique Federale de Lausanne, the Swiss Polar Institute, and Ferring Pharmaceuticals Inc. Joel Pedro acknowledges support from the European Research Council under the European Community''s Seventh Framework Programme (FP7/2007e2013)/ERC grant agreement 610055 as part of the ice2ice project.

The data are from a study investigating ozone (O3) variability in the polar mesosphere and lower thermosphere and uncertainties / biases in satellite ozone profile measurements. The datasets include 1) processed atmospheric datasets derived from O3 observations by the ground-based Ny Ålesund Ozone in the Mesosphere Instrument (NAOMI), an 11.072 GHz ozone radiometer making atmospheric observations from Ny Ålesund, Spitsbergen since 4 July 2017, 2) processed atmospheric datasets derived from selected O3 observations by the SABER satellite instrument, and 3) ancillary atmospheric datasets used for NAOMI retrievals, derived from model (WACCM-D) and reanalysis (MERRA-2) datasets. Supported in part by UK Research and Innovation (UKRI) / Natural Environment Research Council (NERC) Technologies Proof-of-Concept grant reference NE/P003478/1 "Satellite TV-based Ozone and OH Observations using Radiometric Measurements (STO3RM)". MOSAIC instrument testing and deployment was supported by the Royal Society Newton Fund reference NI150103 "The Effect of High Energy Particle Precipitation from Space on the Earth''s Atmosphere". Pekka T. Verronen was supported by Academy of Finland project no. 335555 "ICT-Solutions to Understand Variability of Arctic Climate (ICT-SUNVAC)".

The EISCAT (European Incoherent Scatter ) data is from either the Ultra High Frequency (UHF) or Very High Frequency (VHF) radar observations of Polar Mesospheric Summer Echoes/Winter Echoes (PMSE/PMWE). The data archive contains EISCAT UHF or VHF radar data, processed with GUISDAP (Grand Unified Incoherent Scatter Design and Analysis Package) analysis software, of electron density, ion temperature, electron temperature or ion velocity as a function of altitude along with estimates of their uncertainty. The time and range resolution is variable depending on the analysis settings. Data was collected in July 2012, June-July 2013, June-July 2014 and November 2014.