Interannual variability of the S=1 and S=2 components of the semidiurnal tide in the Antarctic MLT

Hibbins, R. E.; Marsh, Oliver J.; McDonald, A. J.; Jarvis, M. J.

doi:10.1016/j.jastp.2010.03.026

Cited by 13 publications

(24 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This enhancement of the semidiurnal tide was also observed with an MF radar at a lower latitude at McMurdo (78°S, 167°W) [Fritts et al, 1998;Riggin et al, 1999]. By combining wind measurements with an MF radar at Scott Base and an Imaging Doppler interferometer (IDI) [Hibbins et al, 2006] and SuperDARN at Halley (76°S, 26°W) [Hibbins and Jarvis, 2008], Baumgaertner et al [2006] and Hibbins et al [2010aHibbins et al [ , 2010b confirmed that a summer enhancement of the SW1 mode is also observed at these latitudes. From comparisons of the semidiurnal tidal measurements at Scott Base, Molodezhnaya, and Mawson with those at South Pole, Portnyagin et al [1998] suggested that the SW1 mode dominates the semidiurnal tidal response from South Pole to ∼78°S, but that the semidiurnal tide is a mixture of the SW1 and SW2 modes at ∼68°S.…”

Section: Introductionsupporting

confidence: 57%

“…The westward propagating zonal wavenumber 1 (SW1) mode can make a significant contribution to the semidiurnal tidal wind field at high latitudes [ Du et al , 2007; Hibbins et al , 2010b; Mayr et al , 2005; Miyahara et al , 1999; Yamashita et al , 2002]. This mode has been identified in both ground‐based [ Baumgaertner et al , 2006; Hibbins et al , 2010a; Lau et al , 2006; Murphy et al , 2003] and satellite [ Iimura et al , 2010b] measurements. Additionally, Iimura et al [2009] and Murphy et al [2006] found evidence for the standing (SS0) and westward propagating zonal wavenumber 3 (SW3) modes over the Antarctic.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Long-term observations of the wind field in the Antarctic and Arctic mesosphere and lower-thermosphere at conjugate latitudes

Iimura¹,

Fritts²,

Tsutsumi³

et al. 2011

J. Geophys. Res.

View full text Add to dashboard Cite

[1] Mean winds, semidiurnal and diurnal tides, and trends and long-period oscillations spanning a solar cycle (from early 1999 through June 2010) measured by medium frequency (MF) radars at conjugate Antarctic and Arctic latitudes (Syowa, Antarctica, 69°S, 39.6°E, and Andenes, Norway, 69.3°N, 16°E) are described and compared. Zonal mean winds are stronger and more uniform from year to year over the Antarctic, with a stronger eastward winter jet spanning the range of altitudes presented (70 to 96 km). The summer westward jet is also stronger and maximizes at higher altitudes over the Antarctic than over the Arctic. The eastward winter jet over the Arctic, while generally weaker, exhibits a localized maximum in late winter at ∼2 to 3 year intervals. Meridional mean winds likewise achieve somewhat stronger maxima at higher altitudes over the Antarctic than over the Arctic. Semidiurnal tide amplitudes are typically somewhat larger over the Antarctic and similar in the two components, with maxima at ∼85 km or above and narrow responses that tend to cluster from ∼February to May and ∼September to November over the Antarctic and from ∼December to February and ∼June to September over the Arctic. Zonal diurnal tide amplitudes are quite similar between the sites, with maxima extending from ∼70 to 90 km and slightly stronger over the Antarctic. Meridional diurnal amplitudes display more significant growth with altitude, achieve stronger maxima at the highest altitudes presented, and typically exhibit a single and narrow maximum during December to February over the Antarctic and double maxima from ∼May to September over the Arctic. Also discussed are trends and long-period oscillations over a solar cycle observed in these mean and tidal wind fields.

show abstract

Section: Introductionsupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Long-term observations of the wind field in the Antarctic and Arctic mesosphere and lower-thermosphere at conjugate latitudes

Iimura¹,

Fritts²,

Tsutsumi³

et al. 2011

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Numerous studies have identified and characterised the nature of non‐migrating tidal components in the atmosphere, in particular the different modes of the semidiurnal tide in the high‐latitude southern‐hemisphere mesosphere and lower‐thermosphere (MLT) region using optical data [e.g., Hernandez et al , 1993], radar winds [e.g., Forbes et al , 1995; Riggin et al , 1999; Murphy et al , 2003, 2006; Baumgaertner et al , 2006; Hibbins et al , 2010] and satellite data [e.g., Iimura et al , 2009]. In the most extensive study to date Murphy et al [2006] used composite days of monthly‐mean horizontal winds, generated from data recorded over multiple years at eight different ground‐based stations located across Antarctica, to extract all semidiurnal tidal oscillations with zonal wavenumbers from 0 to 3 (S = 0 to 3) normalised to a latitude of 69°S.…”

Section: Introductionmentioning

confidence: 99%

“… Hibbins et al [2010] used a similar approach to that of Baumgaertner et al [2006] to look for evidence of quasi‐biennial variability of the semidiurnal tide in the MLT at high southern latitudes [ Hibbins et al , 2007a]. In this instance they used meteor wind data from the Halley SuperDARN radar for comparison with the Scott Base MF radar.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we take a different approach, and use the time series of S = 1 and S = 2 tidal components presented by Hibbins et al [2010] to investigate the longitudinal dependence of the amplitude and phase of the semidiurnal tide in the Antarctic MLT. We use these data to reconstruct the semidiurnal tide field from the vector sum of the two components.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A new perspective on the longitudinal variability of the semidiurnal tide

Hibbins

Marsh²,

McDonald

et al. 2010

Geophysical Research Letters

View full text Add to dashboard Cite

[1] The longitudinal variability of the semidiurnal tide in the Antarctic upper mesosphere is investigated by comparison of observations from two radars at approximately opposite sides of Antarctica. Under the assumption that the tide is composed of an S = 2 (migrating) and S = 1 (westwardpropagating, non-migrating) component only, the relative phases of the components are shown to vary with season such that the waves are typically in constructive interference during the winter (summer) months at longitudes around 0°E (180°E). We show that this has profound effects on the seasonal behaviour of the semidiurnal tide around 78°S dependent on the longitude, and that no single-station observations at this latitude can be considered representative of a "zonal mean". The superposition of these two waves is used to interpret differences in previously-published ground-based climatologies of the tide.

show abstract

Interannual variability of mesopause zonal winds over Ascension Island: Coupling to the stratospheric QBO

et al. 2013

View full text Add to dashboard Cite

[1] Zonal-wind measurements obtained between October 2001 and July 2011 with the SKiYMET meteor radar located at Ascension Island (8 ı S, 14 ı W) have been used to study the interannual variability at meteor ablation altitudes (approximately 78-100 km) and its coupling to the stratospheric quasi-biennial oscillation (QBO). An upper mesospheric QBO (MQBO) with a period of 27.5 months has been detected throughout the observational period. The MQBO is found to be out-of-phase with the stratospheric QBO (SQBO) at 15-20 hPa and in-phase compared to 70 hPa, whereas no significant zero time-lag correlation exists between the long-term mesospheric zonal winds and the SQBO at 40-50 hPa. The MQBO magnitude is found to be 4.1˙0.7 m/s at 88 km. No significant change in MQBO magnitude is found throughout the altitude range under consideration. It was found that the MQBO signal is mainly carried around the March equinox, although the MQBO signal is present throughout most of the year, although less pronounced, at the lower altitudes as well. No observational evidence was found that the MQBO, between approximately 78-100 km, plays a role in the interhemispheric ducting of the quasi-16 day wave.

show abstract

Interannual variability of the S=1 and S=2 components of the semidiurnal tide in the Antarctic MLT

Cited by 13 publications

References 35 publications

Long-term observations of the wind field in the Antarctic and Arctic mesosphere and lower-thermosphere at conjugate latitudes

Long-term observations of the wind field in the Antarctic and Arctic mesosphere and lower-thermosphere at conjugate latitudes

A new perspective on the longitudinal variability of the semidiurnal tide

Interannual variability of mesopause zonal winds over Ascension Island: Coupling to the stratospheric QBO

Contact Info

Product

Resources

About