Mesosphere/lower thermosphere prevailing wind model

Portnyagin, Yu. I.; Solovjova, T.V.; Merzlyakov, E. G.; Forbes, Jeffrey M.; Palo, S. E.; Ortland, D. A.; Hocking, W. K.; MacDougall, J. W.; Thayaparan, T.; Manson, A. H.; Meek, C. E.; Hoffmann, Peter; Singer, W.; Mitchell, N. J.; Pancheva, D.; Igarashi, K.; Murayama, Yasuhiro; Jacobi, Ch.; Kuerschner, D.; Fahrutdinova, A.; Korotyshkin, D.; Clark, Ronald; Taylor, Mike; Franke, Steven; Fritts, D. C.; Tsuda, Toshitaka; Nakamura, Takuji; Gurubaran, S.; Rajaram, R. Κ.; Vincent, R. A.; Kovalam, S.; Batista, P. P.; Poole, Geoffrey C.; Malinga, Sandile B.; Fraser, G. J.; Murphy, D. J.; Riggin, D. M.; Asô, T.; Tsutsumi, Masaki

doi:10.1016/j.asr.2003.04.058

Cited by 56 publications

(49 citation statements)

References 2 publications

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“…The maximum extent of the westward summertime zonal jet is observed to be up to 10 ms −1 stronger than that predicted by the model and occurs ∼7 km lower than HWM-93. This is also the case in comparison with the zonally-averaged GEWM-1 empirical model of Portnyagin et al (2004b) indicative of atypical summer time gravity wave breaking at Rothera (Lindzen, 1981;Garcia and Solomon, 1985). In all other cases the observed zonal winds and the HWM-93 model winds are in excellent agreement.…”

Section: Comparison With Other Southern Hemisphere Sitessupporting

confidence: 64%

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

et al. 2005

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Abstract.A medium frequency spaced-antenna radar has been operating at Rothera station, Antarctica (67 • S, 68 • W) for two periods, between 1997-1998 and since 2002, measuring winds in the mesosphere and lower thermosphere. In this paper monthly mean winds are derived and presented along with three years of radiosonde balloon data for comparison with the HWM-93 model atmosphere and other high latitude southern hemisphere sites. The observed meridional winds are slightly more northwards than those predicted by the model above 80 km in the winter months and below 80 km in summer. In addition, the altitude of the summer time zero crossing of the zonal winds above the westward jet is overestimated by the model by up to 8 km. These data are then merged with the wind climatology obtained from falling sphere measurements made during the PORTA campaign at Rothera in early 1998 and the HWM-93 model atmosphere to generate a complete zonal wind climatology between 0 and 100 km as a benchmark for future studies at Rothera. A westwards (eastwards) maximum of 44 ms −1 at 67 km altitude occurs in mid December (62 ms −1 at 37 km in mid July). The 0 ms −1 wind contour reaches a maximum altitude of 90 km in mid November and a minimum altitude of 18 km in January extending into mid March at 75 km and early October at 76 km.

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Section: Comparison With Other Southern Hemisphere Sitessupporting

confidence: 64%

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

et al. 2005

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“…Manson et al (2004) used 3 radars in Scandinavia and found that MR winds are larger than MF radar ones by a factor of 1.6 at 97 km, but this factor is close to unity at lower heights. This would mean that the comparatively small prevailing winds even at higher altitudes are not affected as much as the tidal amplitudes and this is thus not in contradiction to Portnyagin et al (2004). In addition, the ratio of MR/MF winds appeared to be larger in winter than in summer.…”

Section: Introductionmentioning

confidence: 77%

“…Spaced antenna measurements are usually performed with MF and also LF. Portnyagin et al (2004) have found a small mean difference of 2 m/s between MR and MF prevailing winds. Manson et al (2004) used 3 radars in Scandinavia and found that MR winds are larger than MF radar ones by a factor of 1.6 at 97 km, but this factor is close to unity at lower heights.…”

Section: Introductionmentioning

confidence: 99%

“…These radar measurements have widely been used to detect mean winds and tides (Manson, 1992;Manson et al, 1989Manson et al, , 2002, and to get insight into the seasonal, interannual, and long-term behaviour of the MLT circulation including long-term trends . In addition, MR and MF radar wind measurements have been combined to analyse properties of planetary waves (Pancheva et al, 2004), and to construct empirical climatologies of MLT wind parameters (Portnyagin and Solovjova, 1998;Portnyagin et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of mesopause region meteor radar winds, medium frequency radar winds and low frequency drifts over Germany

Jacobi

Arras

Kürschner

et al. 2009

Advances in Space Research

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During 2004 and 2005 measurements of mesospheric/lower thermospheric (80-100 km) winds have been carried out in Germany using three different ground-based systems, namely a meteor radar (36.2 MHz) at the Collm Observatory (51.3°N, 13°E), a MF radar (3.18 MHz) at Juliusruh (54.6°N, 13.4°E) and the LF D1 measurements using a transmitter (177 kHz) at Zehlendorf near Berlin and receivers at Collm with the reflection point at 52.1°N, 13.2°E. This provides the possibility of comparing the results of different radar systems in nearly the same measuring volume. Meteor radar winds are generally stronger than the winds observed by MF and especially by LF radars. This difference is small near 80 km but increases with height. The difference between meteor radar and medium frequency radar winds is larger during winter than during summer, which might indicate an indirect influence of gravity waves on spaced antenna measurements.

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“…By measuring the Doppler shift resulting from the motion of the meteor trail, a pulsed Doppler radar can be used to profile the neutral winds in the meteor region. Study of the MLT region using meteor technique began in the 1950s without height information (e.g., Manning et al, 1950;Robertson et al, 1953). Later developments in the meteor radar technique provided further information about the MLT region like winds, tides, gravity waves and planetary waves with specific height resolution.…”

Section: Introductionmentioning

confidence: 99%

Climatology of northern polar latitude MLT dynamics: mean winds and tides

Kumar

Hocking

2010

Ann. Geophys.

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Abstract. Mean winds and tides in the northern polar Mesosphere and Lower Thermosphere (MLT) have been studied using meteor radars located at Resolute Bay The summer zonal flow is westward at lower heights, eastward at upper heights and the winter zonal flow is eastward at all heights. The winter meridional flow is poleward and sometimes weakly equatorward, while non winter months show equatorward flow, with a strong equatorward jet during mid-summer months. The zonal and meridional winds show strong interannual variation with a dominant annual variation as well as significant latitudinal variation. Year to year variability in both zonal and meridional winds exists, with a possible solar cycle dependence. The diurnal, semidiurnal and terdiurnal tides also show large interannual variability and latitudinal variation. The diurnal amplitudes are dominated by an annual variation. The climatological monthly mean winds are compared with CIRA 86, GEWM and HWM07 and the climatological monthly mean amplitudes and phases of diurnal and semidiurnal tides are compared with GSWM00 predictions. The GEWM shows better agreement with observations than the CIRA 86 and HWM07. The GSWM00 model predictions need to be modified above 90 km. The agreements and disagreements between observations and models are discussed.

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Mesosphere/lower thermosphere prevailing wind model

Cited by 56 publications

References 2 publications

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

Seasonal variations in the horizontal wind structure from 0-100 km above Rothera station, Antarctica (67° S, 68° W)

Comparison of mesopause region meteor radar winds, medium frequency radar winds and low frequency drifts over Germany

Climatology of northern polar latitude MLT dynamics: mean winds and tides

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