Arctic tidal characteristics at Eureka (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006/07: seasonal and longitudinal variations, migrating and non-migrating tides

Manson, A. H.; Meek, C. E.; Chshyolkova, T.; Xinwen, Xu; Asô, T.; Drummond, J. R.; Hall, Chris M.; Hocking, W. K.; Jacobi, Ch.; Tsutsumi, Masaki; Ward, W. E.

doi:10.5194/angeo-27-1153-2009

Cited by 38 publications

(64 citation statements)

References 33 publications

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“…Manson et al, 1988Manson et al, , 1989Manson et al, , 2009Vincent et al, 1988;Avery et al, 1989;Portnyagin et al, 1993;Fraser et al, 1995;Mitchell et al, 2002). At these latitudes the diurnal tidal modes are predominantly trapped, and so in the MLT region the semidiurnal tide has larger amplitudes.…”

Section: R N Davis Et Al: Mesospheric Tides Over Ascension Islandmentioning

confidence: 99%

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

et al. 2013

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The diurnal zonal vertical wavelengths are similar to the meridional, except for the winter months when the zonal vertical wavelengths are much longer, occasionally exceeding 100 km. Semidiurnal amplitudes are observed to be significantly smaller than diurnal amplitudes. Semidiurnal vertical wavelengths range from 20 to more than 100 km. Our observations of tidal amplitudes and phases are compared with the predictions of the extended Canadian Middle Atmosphere Model (eCMAM) and the Whole Atmosphere Community Climate Model (WACCM). Both eCMAM and WACCM reproduce the trend for greater diurnal amplitudes in the meridional component than the zonal. However, eCMAM tends to overestimate meridional amplitudes, while WACCM underestimates both zonal and meridional amplitudes. Vertical wavelength predictions are generally good for both models; however, eCMAM predicts shorter diurnal zonal vertical wavelengths than are observed in winter, while WACCM predicts longer zonal vertical wavelengths than observed for the semidiurnal tide for most months. Semidiurnal amplitude predictions are generally good for both models. It is found that larger-than-average diurnal and semidiurnal tidal amplitudes occur when the stratospheric quasi-biennial oscillation (QBO) at 10 hPa is eastwards, and smaller-than-average amplitudes occur when it is westwards. Correlations between the amplitude perturbations and the El Niño Southern Oscillation are also found. The precise mechanism for these correlations remains unclear.

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Section: R N Davis Et Al: Mesospheric Tides Over Ascension Islandmentioning

confidence: 99%

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

et al. 2013

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“…Meteor radars have become valuable tools for probing MLT dynamics, especially in the 1990s and beyond. Over arctic latitudes, studies of mean wind and tides have been carried out using limited data of lengths of typically less than 1-2 years (e.g., Hocking, 2001;Mitchell et al, 2002;Manson et al, 2009) and only a few observations deal with long term observations (Portnyagin et al, 2004;Day and Mitchell et al, 2010). But there are no long term observations such as those made over mid-and low-latitudes (Nakamura et al, 1996;Kishore Kumar et al, 2008, and references therein).…”

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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“…Manson et al (2009), based upon analysis of the Svalbard and Eureka tides during 2006/2007, showed that at latitudes near 80 • N the semidiurnal MT (s=2) is dominant in summer, while the semidiurnal NMT with s=1 and s=3 occur most often during equinoctial or early summer months. Portnyagin et al (2004) examined the slopes of the tidal phases (time of maximum in UT) versus longitudes and concluded that in the southern • N) the migrating tides are dominant for both diurnal and semidiurnal oscillations during all months, but with some indications of NMT in May-June.…”

Section: Introductionmentioning

confidence: 99%

Relationship between variability of the semidiurnal tide in the Northern Hemisphere mesosphere and quasi-stationary planetary waves throughout the global middle atmosphere

et al. 2009

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Abstract. To investigate possible couplings between planetary waves and the semidiurnal tide (SDT), this work examines the statistical correlations between the SDT amplitudes observed in the Northern Hemisphere (NH) mesosphere and stationary planetary wave (SPW) with wavenumber S=1 (SPW1) amplitudes throughout the global stratosphere and mesosphere. The latter are derived from the Aura-MLS temperature measurements. During NH summerfall (July-October), the mesospheric SDT amplitudes observed at Svalbard (78 • N) and Eureka (80 • N) usually do not show persistent correlations with the SPW1 amplitudes in the opposite hemisphere. Although the SDT amplitudes observed at lower latitudes (∼50-70 • N), especially at Saskatoon (52 • N), are often shown to be highly and positively correlated with the SPW1 amplitudes in high southern latitudes, these correlations cannot be sufficiently explained as evidence for a direct physical link between the Southern Hemisphere (SH) winter-early spring SPW and NH summer-early fall mesospheric SDT. This is because the migrating tide's contribution is usually dominant in the mid-high latitude (∼50-70 • N) NH mesosphere during the local late summerearly fall (July-September). The numerical correlation is dominated by similar low-frequency variability or trends between the amplitudes of the NH SDT and SH SPW1 during the respective equinoctial transitions. In contradistinction,Correspondence to: X. Xu (xix303@mail.usask.ca) during NH winter (November-February), the mesospheric SDT amplitudes at northern mid-high latitudes (∼50-80 • N) are observed to be significantly and positively correlated with the SPW1 amplitudes in the same hemisphere in most cases. Because both the SPW and migrating SDT are large in the NH during the local winter, a non-linear interaction between SPW and migrating SDT probably occurs, thus providing a global non-migrating SDT. This is consistent with observations of SDT in Antarctica that are large in summer than in winter. It is suggested that climatological hemispheric asymmetry, e.g. the SH and NH winter characteristics are substantially different, lead to differences in the inter-hemispheric SPW-tide physical links.

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Arctic tidal characteristics at Eureka (80° N, 86° W) and Svalbard (78° N, 16° E) for 2006/07: seasonal and longitudinal variations, migrating and non-migrating tides

Cited by 38 publications

References 33 publications

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

The diurnal and semidiurnal tides over Ascension Island (° S, 14° W) and their interaction with the stratospheric quasi-biennial oscillation: studies with meteor radar, eCMAM and WACCM

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

Relationship between variability of the semidiurnal tide in the Northern Hemisphere mesosphere and quasi-stationary planetary waves throughout the global middle atmosphere

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