25d329ad-69de-4bd3-846d-427863b27781 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 2013-04-23 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 Middle atmospheric carbon monoxide above Troll station, Antarctica from February 2008 - January 2010: V2.0 2013-04-23 creation 2013-04-23 revision 2013-04-23 publication 2013-04-23 released "2.0" https://doi.org/10.5285/25d329ad-69de-4bd3-846d-427863b27781 doi GB/NERC/BAS/PDC/00791 https://data.bas.ac.uk/ Please cite this item as: Espy, P., Straub, C., & Newnham, D. (2012). Middle atmospheric carbon monoxide above Troll station, Antarctica from February 2008 - January 2010: V2.0 (Version "2.0") [Data set]. Polar Data Centre; British Antarctic Survey, Natural Environment Research Council; Cambridge, CB3 0ET, UK.. https://doi.org/10.5285/25d329ad-69de-4bd3-846d-427863b27781 Version 2.0 This data set contains mesospheric carbon monoxide (CO) data acquired by the ground-based microwave radiometer of the British Antarctic Survey (BAS radiometer) stationed at Troll station 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. This data set contains the CO measurements carried out in order to study the dynamical context. The data set covers the period from February 2008 to January 2010, however, due to very low CO concentrations below approximately 80 km altitude in summer, profiles can only be retrieved during Antarctic winter. CO is measured for approximately 2 hours each day (80 percent of the profiles are within +-2 hours around local noon) and profiles are retrieved approximately every half hour. The retrieved profiles, cover two independent layers in the pressure range from 1 to 0.01 hPa (approximately 48 to 80 km, altitude resolution of approximately 16 km). In this version of the data; an additional column of "apriori vmr" has been included in the data files. No credit. completed Espy, Patrick Norwegian University of Science and Technology Researcher author Newnham, David British Antarctic Survey Researcher author Straub, Corinne Norwegian University of Science and Technology 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/Carbon and Hydrocarbon Compounds > Carbon Monoxide 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 Troll 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 This dataset is supplied under the Open Government Licence v3.0: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ url url crossReference textTable eng utf8 climatologyMeteorologyAtmosphere 2.53333 2.53333 -72.01667 -72.01667 2008-02-29 2009-10-31 1270.0 1270.0 urn:ogc:def:crs:EPSG::5714 MSL height Not specific to any location or epoch. Hydrography. 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 bytes 1 https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=25d329ad-69de-4bd3-846d-427863b27781 WWW:LINK-1.0-http--link Get Data Download data download dataset Methodology: The ground-based microwave radiometer of the British Antarctic Survey (BAS) measures spectra in the region of the rotational transitions centered at 250.796 GHz (nitric oxide, NO), 249.79 GHz and 249.96 GHz (ozone, O3) and 230.538 GHz (carbon monoxide, CO). A three-way mechanical chopper system selects the microwave signal either from the main reflector pointing to the sky at 30 deg elevation angle, a 60 K cold load or an ambient-temperature calibration load mounted on the chopper wheel, and directs it into the main receiver. The sky signal is then calibrated using the Dicke switching technique. One calibration cycle takes 26 s with 8 s integration time on each target. However, in order to achieve a high enough signal to noise ratio for the profile retrieval, several measured spectra are integrated. To produce this data set 80 spectra from consecutive calibration cycles were averaged, which under good observing conditions results in a measurement noise of less than 0.15 K and an integration time of less than 30 minutes. Spectra with measurement noise higher than 0.25 K, due to e.g. high tropospheric opacity, were not considered for profile retrieval. During the winters 2008 and 2009 (492 measurement days) the radiometer acquired a total of 1974 integrated spectra over 394 days that are suited for profile retrieval. The inversions of the CO spectra were performed using the optimal estimation method implemented in the Qpack software package (v2.0.0). The forward model is provided by the Atmospheric Raditative Transfer Simulator (ARTS), a modular program simulating atmospheric radiative transfer. asNeeded completed