Middle atmospheric carbon monoxide above Troll station, Antarctica from February 2008 - January 2010: V2.0

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.

Date (Creation): 2013-04-23

Date (Revision): 2013-04-23

Date (Publication): 2013-04-23

Date (released): 2013-04-23

Edition: "2.0"

Unique resource identifier: https://doi.org/10.5285/25d329ad-69de-4bd3-846d-427863b27781

Codespace: doi

Unique resource identifier: GB/NERC/BAS/PDC/00791

Codespace: https://data.bas.ac.uk/

Other citation details: 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

Credit: No credit.

Status: Completed

Point of contact

Organisation name	Individual name	Electronic mail address	Role
Norwegian University of Science and Technology	Espy, Patrick		Author
British Antarctic Survey	Newnham, David		Author
Norwegian University of Science and Technology	Straub, Corinne		Author
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Point of contact

Maintenance and update frequency: As needed

Maintenance note: Completed

Global Change Master Directory (GCMD) Science Keywords

EARTH SCIENCE > Atmosphere > Atmospheric Chemistry/Carbon and Hydrocarbon Compounds > Carbon Monoxide

Place

Troll Antarctica

GEMET - INSPIRE themes, version 1.0

Atmospheric conditions

Access constraints: Other restrictions

Other constraints: no limitations to public access

Access constraints: Other restrictions

Other constraints: no limitations

Use constraints: License

Other constraints: This dataset is supplied under the Open Government Licence v3.0: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/

Unique resource identifier: url

Codespace: url

Association Type: Cross reference

Spatial representation type: Text, table

Language: English

Character set: UTF8

Topic category

Climatology, meteorology, atmosphere

Begin date: 2008-02-29

End date: 2009-10-31

Vertical extent

Minimum value: 1270.0

Maximum value: 1270.0

Vertical CS

No information provided.

Vertical datum

No information provided.

Supplemental Information: 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.

Title: European Petroleum Survey Group (EPSG) Geodetic Parameter Registry

Date (Publication): 2008-11-12

Cited responsible party

Organisation name	Individual name	Electronic mail address	Role
European Petroleum Survey Group		EPSGadministrator@iogp.org	Publisher

Unique resource identifier: urn:ogc:def:crs:EPSG::3031

Version: 6.18.3

Distributor

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		PDCServiceDesk@bas.ac.uk	Distributor

Units of distribution: bytes

Transfer size: 1

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--link	https://ramadda.data.bas.ac.uk/repository/entry/show/?entryid=25d329ad-69de-4bd3-846d-427863b27781	Get Data

Hierarchy level: Dataset

Statement: 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.

Metadata

File identifier: 25d329ad-69de-4bd3-846d-427863b27781 XML

Metadata language: English

Character set: UTF8

Hierarchy level: Dataset

Hierarchy level name: dataset

Date stamp: 2013-04-23

Metadata standard name: ISO 19115 Geographic Information - Metadata

Metadata standard version: ISO 19115:2003(E)

Metadata author

Organisation name	Individual name	Electronic mail address	Role
NERC EDS UK Polar Data Centre		polardatacentre@bas.ac.uk	Point of contact

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