94b2f348-d6cc-4bcd-b921-5c0928ab3c2d eng utf8 dataset dataset NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom polardatacentre@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact 2023-03-10 ISO 19115 Geographic Information - Metadata ISO 19115:2003(E) European Petroleum Survey Group (EPSG) Geodetic Parameter Registry 2008-11-12 publication European Petroleum Survey Group EPSGadministrator@iogp.org https://www.epsg-registry.org/ EPSG Geodetic Parameter Dataset The EPSG Geodetic Parameter Dataset is a structured dataset of Coordinate Reference Systems and Coordinate Transformations, accessible through this online registry. information publisher urn:ogc:def:crs:EPSG::3031 6.18.3 Atmospheric nitrous acid amount fraction at Halley in January and February 2022 2023-03-10 creation 2023-03-10 revision 2023-03-10 publication 2023-03-10 released 1.0 https://doi.org/10.5285/94b2f348-d6cc-4bcd-b921-5c0928ab3c2d doi GB/NERC/BAS/PDC/01718 https://data.bas.ac.uk/ NE/S007334/1 award Please cite this item as: Bond, A., Squires, F., Frey, M., & Kaiser, J. (2023). Atmospheric nitrous acid amount fraction at Halley in January and February 2022 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/94b2f348-d6cc-4bcd-b921-5c0928ab3c2d 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). No credit. completed Bond, Amelia British Antarctic Survey Researcher author Squires, Freya British Antarctic Survey Researcher author Frey, Markus British Antarctic Survey Researcher author Kaiser, Jan University of East Anglia Researcher author NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information pointOfContact asNeeded completed EARTH SCIENCE > Atmosphere > Atmospheric Chemistry > Trace Gases/Trace Species EARTH SCIENCE > Atmosphere > Atmospheric Chemistry EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Nitrogen Compounds theme Global Change Master Directory (GCMD) Science Keywords 2026-01-27 publication 23 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) Greenbelt MD United States of America https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher atmospheric chemistry nitrous acid reactive nitrogen trace gas theme Halley VI Research Station Antarctica place Atmospheric conditions theme GEMET - INSPIRE themes, version 1.0 2021-01-06 revision otherRestrictions no limitations to public access otherRestrictions no limitations license Open Government Licence v3.0 otherRestrictions Data supplied under Open Government Licence v3.0 otherRestrictions None url url crossReference doi doi crossReference textTable eng utf8 climatologyMeteorologyAtmosphere -26.7 -26.7 -75.58 -75.58 2022-01-22 2022-02-03 It is recommended that careful attention be paid to the contents of any data, and that the author be contacted with any questions regarding appropriate use. If you find any errors or omissions, please report them to polardatacentre@bas.ac.uk. NERC EDS UK Polar Data Centre +44 (0)1223 221400 British Antarctic Survey, High Cross, Madingley Road Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/team/business-teams/information-services/uk-polar-data-centre/ information distributor text/csv bytes 2621440 https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=94b2f348-d6cc-4bcd-b921-5c0928ab3c2d WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The nitrous acid (HONO) amount fraction was measured at 1 minute resolution using a Long Path Absorption Photometer (LOPAP). Data has been processed to remove interferences and account for time delays in the instrument. Regular baseline measurements (blanks) and calibrations were carried out and have been applied to the data; the blanks and calibration periods have been removed from the dataset. The HONO amount fraction is given in pmol mol-1. The inlet height column relates to the height of the inlet of the LOPAP above the snow. A value of 0 represents inlet in transit and we recommend ignoring this data. The temperature measurements were collected at 1.26 and 0.05 m above the snow surface (indicated in column headings). The data was collected at 5 second intervals and are given in oC. U and V wind vectors were collected at 1 m above the snow at 5 second intervals and are given in ms-1. The temperature and wind data were collected to allow calculation of the HONO flux from the snow by the flux gradient method. All times are UTC. Data collection: Instruments: a. HONO: LOng Path Absorption Photometer (LOPAP, QUMA Elektronik & Analytik GmbH) b. Wind: Gill Wind Observer 70 c. Temperature: TME Ethernet Thermometer Data quality: HONO: During the campaign the LOPAP was calibrated every 5 days using nitrite solutions of known concentration (2 x 10^-3 and 8 x 10^-4 mg L-1). The gas flow rate was set to 2 L min-1 (298 K, 1 atm) with the internal mass flow controller and checked frequently using a flow meter (DryCal DC-Lite), and the liquid flow rate through the stripping coil for each channel was regularly measured volumetrically and was between 0.15 and 0.18 mL min-1 during the measurement period. Baseline measurements were made every 6 hours using a flow of pure nitrogen (99.998 %, BOC) at the instrument inlet. The detection limit (3 sigma-blank) was 0.26 pmol mol-1 for the measurement period. Any missing values and gaps in the time series correspond to blanks and calibrations that have now been removed from the dataset. Wind and temperature: data has not been calibrated. Missing values are caused by issues with the instruments/data collection. asNeeded completed