Mean winds and tides in the mesosphere and lower thermosphere above Halley, Antarctica

Hibbins, R. E.; Espy, P. J.; Jarvis, M. J.

doi:10.1016/j.jastp.2005.02.030

Cited by 21 publications

(36 citation statements)

References 18 publications

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“…The IDI at Halley , based upon the technique of Adams et al (1985Adams et al ( , 1986, is a modification of the Halley Dynasonde, a NOAA HF radar (Grubb, 1979;Wright and Pitteway, 1979), and its operation has been described in detail elsewhere Charles and Jones, 1999;Hibbins et al, 2006). Three component winds are recorded every 5 or 15 min for each 5 km altitude bin between 75 and 105 km, and for this study hourly mean meridional winds were calculated provided at least two different data points were present in the height bin during that hour.…”

Section: Instruments and Datamentioning

confidence: 99%

“…Over this period the SuperDARN radar has generated hourly mean winds for 84% of the time with minor periods of down time for system maintenance primarily during the austral summer. For the IDI 67% of hours since December 1996 have generated wind data, but between 22 January 2002 and 18 February 2003 the IDI soundings were made on a delta antenna while the logperiodic antenna used for routine IDI soundings at 2.75 MHz was repaired following damage; this resulted in a 60% decrease in the number of returned echoes and consequently much poorer quality winds (Hibbins et al, 2006). These data have therefore been excluded from this study resulting in 54% of the time when both radars are simultaneously recording good quality data.…”

Section: Instruments and Datamentioning

confidence: 99%

“…At Halley (76 • S, 27 • W) an imaging Doppler interferometer (IDI) has been running since December 1996 recording winds between ∼75 and 105 km, and a climatology of winds and tides has recently been published (Hibbins et al, 2006). At the same site a SuperDARN radar has been running since 1988 and has been used to derive winds in the lower thermosphere by tracing the ionisation trail left by meteors as they ablate in the MLT (Jenkins et al, 1998;Jenkins and Jarvis, 1999).…”

Section: Introductionmentioning

confidence: 99%

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A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Hibbins

Jarvis

2008

Atmos. Chem. Phys.

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Abstract. Data from a near co-located imaging Doppler interferometer (IDI) and SuperDARN radar recorded since 1996 have been analysed in a consistent manner to compare the derived mean winds and tides in the upper mesosphere. By comparing only days when both techniques were recording good quality meridional wind data it is shown that the SuperDARN radar winds and tides correlate best with the IDI height bin 90-95 km. On timescales of one hour the winds derived from the IDI have a much greater associated variance and correlate poorly with the SuperDARN winds. Regression analysis reveals that the observed SuperDARN daily mean meridional wind strength is approximately 65% that recorded by the IDI, in good quantitative agreement with previous studies which have shown contamination to Super-DARN derived winds due to the significant back lobe of the radar radiation pattern. Climatologically the two techniques observe similar monthly mean winds with the Super-DARN meridional winds suppressed compared to the IDI which tends to record winds more poleward than those derived by the SuperDARN radar during the summer months, and to be slightly more equatorward during the winter. The 12-h tidal amplitude and phase derived from both techniques are in good agreement, whereas the 24-h tides are seen much more strongly in the SuperDARN radar, especially in wintertime, with poor phase agreement. Long term comparison of the two techniques reveals a tendency for the IDI meridional winds to be more poleward during solar maximum especially during summer time; an effect which is not reproduced in the meridional winds derived from the SuperDARN radar. These results are discussed in the context of previous studies to independently determine the veracity of each technique, and to highlight the circumstances where data derived Correspondence to: R. E. Hibbins (rehi@bas.ac.uk) from these two techniques can be used to draw reliable conclusions from comparative studies based on geographically distributed pairs of instruments.

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Section: Instruments and Datamentioning

confidence: 99%

Section: Instruments and Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Hibbins

Jarvis

2008

Atmos. Chem. Phys.

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“…Comparison of their measured time series from four locations at polar, mid-, and tropical latitudes with ECMWF model data showed that meridional and zonal stratospheric winds agreed to within 10 %. However in the mesosphere, above 40-50 km, observed and modelled zonal wind speeds differ significantly by up to 50 % (Rüfenacht et al, 2014 (Hibbins et al, 2006(Hibbins et al, , 2009Nielsen et al, 2012). These observations have been limited to the troposphere, lower stratosphere, and upper mesosphere; co-located radiometric measurements could provide complementary observations filling the gap in altitudes at 25-75 km.…”

Section: Introductionmentioning

confidence: 98%

Simulation study for measurement of horizontal wind profiles in the polar stratosphere and mesosphere using ground-based observations of ozone and carbon monoxide lines in the 230–250 GHz region

Newnham¹,

Ford²,

Moffat‐Griffin³

et al. 2016

Atmos. Meas. Tech.

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Abstract. Meteorological and atmospheric models are being extended up to 80 km altitude but there are very few observing techniques that can measure stratospheric-mesospheric winds at altitudes between 20 and 80 km to verify model datasets. Here we demonstrate the feasibility of horizontal wind profile measurements using ground-based passive millimetre-wave spectroradiometric observations of ozone lines centred at 231.28, 249.79, and 249.96 GHz. Vertical profiles of horizontal winds are retrieved from forward and inverse modelling simulations of the line-of-sight Dopplershifted atmospheric emission lines above Halley station (75 • 37 S, 26 • 14 W), Antarctica. For a radiometer with a system temperature of 1400 K and 30 kHz spectral resolution observing the ozone 231.28 GHz line we estimate that 12 h zonal and meridional wind profiles could be determined over the altitude range 25-74 km in winter, and 28-66 km in summer. Height-dependent measurement uncertainties are in the range 3-8 m s −1 and vertical resolution ∼ 8-16 km. Under optimum observing conditions at Halley a temporal resolution of 1.5 h for measuring either zonal or meridional winds is possible, reducing to 0.5 h for a radiometer with a 700 K system temperature. Combining observations of the 231.28 GHz ozone line and the 230.54 GHz carbon monoxide line gives additional altitude coverage at 85 ± 12 km. The effects of clear-sky seasonal mean winter/summer conditions, zenith angle of the received atmospheric emission, and spectrometer frequency resolution on the altitude coverage, measurement uncertainty, and height and time resolution of the retrieved wind profiles have been determined.

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“…By vector differencing the longitudinally different waves in local time they observed a non-zero resultant vector due to the non-migrating component of the 12-hour wave. Hibbins et al [2006] compared climatologies of the 12-hour wave observed with an imaging Doppler interferometer at Halley (76°S, 27°W) with those recorded by MF radar from other Antarctic sites. They found a strong enhancement of the 12-hour wave around summertime similar to that seen at sites poleward of Halley, e.g.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica

Hibbins

Espy

Jarvis

2007

Geophysical Research Letters

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[1] We present an analysis of a long-term archive of horizontal wind data derived from meteor wind observations from a SuperDARN radar at Halley, Antarctica (76°S, 27°W). Systematic differences between the 12-hour component in the meridional wind and the climatological mean are observed showing evidence of a quasi-biennial modulation of the high-latitude semidiurnal tide in the upper mesosphere. The amplitude of the observed tides is enhanced when the equatorial stratospheric quasibiennial oscillation above 10 hPa is westerly. This enhancement is greatest in the summertime tidal amplitudes when the zonal wavenumber one (S = 1) nonmigrating component dominates the semidiurnal wind field, and is coincident with an enhancement of the summertime planetary wave activity in the upper mesosphere. These observations strongly support the hypothesis that the S = 1 component of the semidiurnal tide observed at high latitudes is due to a non-linear interaction between the migrating S = 2 semidiurnal tide and quasi-stationary S = 1 planetary waves.Citation: Hibbins, R. E., P. J. Espy, and M. J. Jarvis (2007), Quasi-biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica, Geophys. Res. Lett., 34, L21804,

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Mean winds and tides in the mesosphere and lower thermosphere above Halley, Antarctica

Cited by 21 publications

References 18 publications

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Simulation study for measurement of horizontal wind profiles in the polar stratosphere and mesosphere using ground-based observations of ozone and carbon monoxide lines in the 230–250 GHz region

Quasi‐biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica

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Mean winds and tides in the mesosphere and lower thermosphere above Halley, Antarctica

Cited by 21 publications

References 18 publications

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

A long-term comparison of wind and tide measurements in the upper mesosphere recorded with an imaging Doppler interferometer and SuperDARN radar at Halley, Antarctica

Simulation study for measurement of horizontal wind profiles in the polar stratosphere and mesosphere using ground-based observations of ozone and carbon monoxide lines in the 230–250 GHz region

Quasi‐biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica

Contact Info

Product

Resources

About

Simulation study for measurement of horizontal wind profiles in the polar stratosphere and mesosphere using ground-based observations of ozone and carbon monoxide lines in the 230–250 GHz region