Davis Medium Frequency Middle Atmosphere Radar WindsEntry ID: Davis_MFSA_Radar
Abstract: This dataset contains wind speed and direction in the middle atmosphere above Davis, Antarctica. The radar runs continuously. Data are collected and stored every two minutes (excluding downtime for maintenance) for heights in the approximate range 50km to 110km at 2km intervals. Analysis of the source data yields parameters describing the strength and character of the radar echo and, when certain ... acceptance criteria are met, the wind speed. The requirement to meet acceptance criteria results in a data rate that may be less than the sampling rate.
Data collection began in 1994 and is ongoing.
Changes to the polarisation of the transmitted radar pulse are used to maximise the range over which winds can be obtained, using the differing reflection and absorption characteristics of the ordinary and extraordinary modes. These have the potential to yield measures of electron density over the sampled height range. A combination of technical difficulties and unknown issues have meant that these data have not yielded results that are considered reliable.
The data set is standalone. MFSA stands for Medium Frequency Spaced Array. This is in reference to the transmitted frequency and the antenna configuration needed for Full Correlation Analysis (FCA).
The operation of the MFSA radar has supported a number of Antarctic Science Research projects. These include:
Project 674 – 'Dynamical coupling in the Antarctic middle atmosphere'. 1993/94 to 2011/12
Project 4025 – 'Gravity wave drag parameterization in climate models'. 2012/13 to 2016/17
Project 4445 – 'High-latitude gravity wave processes and their parameterization in climate models' 2017/18 to 2020/21
Further details of the outcomes of these projects can be found on the Antarctic Division website www.aad.gov.au. The data have also contributed to Australian and international research activities beyond these projects. Similar radars are/have been operated by other countries at Antarctic stations including Syowa (Japan), Rothera (UK), McMurdo (USA) and Scott Base (NZ).
Summer 1993/94 – New radar equipment and existing equipment previously operating at Mawson station were installed at Davis. Operation and data collection began on 11 April 1994. This mode of operation used 8-bit digitisation of received signals, ongoing gain adjustment and polarization changes between (rather than within) data accumulation cycles.
Summer 2000/2001 – An upgrade to the receiver and digitiser system removed the need for gain adjustment and introduced 12 bit digitisation. Polarisation changes within data accumulation cycles became possible. Operation began on 7 November 2000.
Summer 2008/9 – Container laboratory replaced.
Feb 2012 – Transmit antenna replaced. Replacement allows tap changes to improve tuning of antenna impedance.
Data Set Citation
Dataset Originator/Creator: Vincent, R. and Murphy, D.
Dataset Title: Davis Medium Frequency Middle Atmosphere Radar Winds
Dataset Series Name: CAASM Metadata
Dataset Release Date: 1999-10-07
Dataset Publisher: Australian Antarctic Data CentreOnline Resource: https://data.aad.gov.au/aadc/metadata/metadata_redirect.cfm?md=/AMD...
Start Date: 1994-04-14
Quality Data analysis may or may not yield a full set of attributes. Data acceptance rates vary with height. The radar runs continuously (excluding downtime for maintenance and data transfer). Source data consists of digitised and coherently averaged measurements of the in phase and quadrature signal levels for each of the three receiving antennas and for each range that is sampled. The source data are ... collected for the first 102.4 seconds of each 2 minute interval that the radar is operational. The source data are analysed using Full Correlation Analysis to produce winds and a number of parameters describing the radar echoes. All data are labelled with height and (universal) time. The radar produces an average wind for the region described by the geographical polygon. Adjacent 2 km height samples straddle the 'width' of the transmitted pulse and so are not independent samples.
Ionospheric disturbances can drastically increase the radio wave absorption in the sampled height range so that no winds are measured or that they are measured at lower altitudes. Such disturbances can last for a day or longer.
At times, the analysis yields wind measurements in the lower height ranges (below approximately 60 km) that pass the acceptance criteria but that are spatially and temporally variant is magnitude and direction. These are not thought to be real wind measurements. Instead they are thought to be the effects of 'sea-ice clutter' where horizontal radar power leakage is reflected from slowly moving ice. Iceberg traces are sometimes also visible in signal to noise ratio measurements. These forms of data corruption are dominant below the usual range of wind measurements.
Access Constraints Binary data stored in format as defined in 'Atmospheric Radar Systems MF 3 Channel Radar Systems' Software Reference manual V3.2 was collected until 02:46UT on 5 Jan 1998. Binary data stored in 'FCA' format has been collected since 9 Jan 1998. A section describing the Full Correlation Analysis (FCA) format is included in 'ATRAD Radar System Software Reference Manual'.
The code required to read these binary data are available from ATRAD, the radar manufacturers. See www.atrad.com.au for contact details.
Currently data from 1994 onward are available. These data are too large to be downloaded, and are available upon request to the Australian Antarctic Data Centre.
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=Davis_MF... when using these data.
Please also contact the investigator when using these data.
Data Set Progress
Distribution Media: HTTP
Distribution Size: 10.8 GB
Phone: +61 8 8303 6125
Email: rvincent at physics.adelaide.edu.au
University of Adelaide
Role: TECHNICAL CONTACT
Phone: +61 3 6232 3359
Fax: +61 3 6232 3496
Email: damian.murphy at aad.gov.au
203 Channel Highway Australian Antarctic Division
Province or State: Tasmania
Postal Code: 7050
Role: DIF AUTHOR
Phone: +61 3 6232 3244
Fax: +61 3 6232 3351
Email: dave.connell at aad.gov.au
Australian Antarctic Division 203 Channel Highway
Province or State: Tasmania
Postal Code: 7050
Baumgaertner, A.J.G., McDonald, A.J., Hibbens, R.E., Fritts, D.C., Murphy, D.J., Vincent, R.A. (2008), Short-period planetary waves in the Antarctic middle atmosphere, Journal of Atmospheric and Solar-Terrestrial Physics, 70, 1336-1350
Innis, J.L., Klekociuk, A.R., Morris, R.J., Cunningham, A.P., Graham, A.D., Murphy, D.J. (2008), A study of the relationship between stratospheric gravity waves and polar mesospheric clouds at Davis Antarctica, Journal of Geophysical Research, 113, D14102, doi:doi:10.1029?2007JD009031
Latteck, R., Singer, W., Morris, R.J., Hocking, W.K., Murphy, D.J., Holdsworth, D.A., Swarnalingam, N. (2008), Similarities and difference in polar mesosphere summer echoes observed in the Arctic and Antarctica, Annales Geophysicae, 26, 2795-2806
Merzlyakov, E.G., Murphy, D.J., Vincent, R.A., Portnyagin, Yu.I. (2009), Long-term tendencies in the MLT prevailing winds and tides over Antarctica as observed by radars at Molodezhnaya, Mawson and Davis, Journal of Atmospheric and Solar-Terrestrial Physics, 71, 21-32
Morris, R.J., Klekociuk, A.R., Latteck, R., Singer, W., Holdsworth, D.A., Murphy, D.J. (2009), Inter-hemispheric asymmetry in polar mesosphere summer echoes and temperature at 69 latitude, Journal of Atmospheric and Solar-Terrestrial Physics, 71, 464-469
Nilsson, H., Kirkwood, S., Morris, R.J., Latteck, R., Klekociuk, A.R., Murphy, D.J., Zecha, M., Belova, E. (2008), Simultaneous observations of Polar Mesosphere Summer Echoes at two different latitudes in Antarctica, Annales Geophysicae, 26, 3783-3792
Murphy, D. J., Aso, T., Fritts, D. C., Hibbins, R. E., McDonald, A. J., Riggin, D. M., Tsutsumi, M. and Vincent, R. A. (2009), Source regions for Antarctic MLT non-migrating semidiurnal tides, Geophysical Research Letters, 36, L09805, 1-5, doi:doi:10.1029/2008GL037064
Murphy, D. J., Aso, T., Tsutsumi, M., Fritts, D. C., Riggin, D. M., Hibbins, R. E., McDonald, A. J. and Vincent, R. A. (2008), Zonally symmetric tides in the mesosphere and lower thermosphere above Antarctica, 37th COSPAR Scientific Assembly, 13 - 20 July 2008, Montreal, Canada
Murphy, D. J., Aso, T., Tsutsumi, M., Fritts, D. C., Riggin, D. M., Hibbins, R. E., McDonald, A. J. and Vincent, R. A. (2008), Variations in non-migrating tides in the Antarctic mesosphere and lower thermosphere; their relationship to planetary waves, 37th COSPAR Scientific Assembly, 13 - 20 July 2008, Montreal, Canada
Murphy, D. J., Aso, T., Fritts, D. C., Hibbins, R. E., McDonald, A. J., Merzlyakov, E., Portnyagin, Yu. I., Riggin, D. M., Tsutsumi, M. and Vincent, R. A. (2008), Radar studies of the large-scale dynamics of the mesosphere and lower thermosphere above Antarctica, 32nd Symposium on Space and Upper Atmospheric Sciences in the polar regions, National Institute of Polar Research, Tokyo, Japan, August 4-5, 2008.
Murphy, D. J., Aso, T., Fritts, D. C., Hibbins, R. E., McDonald, A. J., Merzlyakov, E., Portnyagin, Yu. I., Riggin, D. M., Tsutsumi, M. and Vincent, R. A. (2008), Radar studies of the large-scale dynamics of the mesosphere and lower thermosphere above Antarctica, Australian Institute of Physics 18th National Congress, Adelaide, 30 Nov-5 Dec 2008.
Vincent, R. A., Merzlyakov, E., Portnyagin, Yu. I. and Murphy, D. J. (2008), Long Term Trends in Mesosphere Lower Thermosphere prevailing winds and tides over Antarctica, Scientific Committee on Antarctic Research (SCAR), International Arctic Science Committee (IASC) Open Science Conference, St. Petersburg, Russia July 8th - 11th 2008
Extended Metadata Properties
(Click to view more)
Creation and Review Dates
DIF Creation Date: 1999-10-07
Last DIF Revision Date: 2017-10-13