Anomalous two‐day wave behavior during the 2006 austral summer

Limpasuvan, Varavut; Wu, Dong L.

doi:10.1029/2008gl036387

Cited by 48 publications

(80 citation statements)

References 23 publications

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“…It is stronger than the maximum amplitude of W2 QTDW. In all, both the W2 and W3 QTDW events in SABER temperature and TIDI wind observations agree well with the previous studies [ Limpasuvan and Wu , ; Tunbridge et al ., ; Gu et al ., ].…”

Section: Resultsmentioning

confidence: 99%

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Liu

et al. 2015

JGR Space Physics

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The nonlinear interaction between the westward quasi 2 day wave (QTDW) with zonal wave number s = 3 (W3) and stationary planetary wave with s = 1 (SPW1) is first investigated using both Thermosphere, Ionosphere, and Mesosphere Electric Dynamics (TIMED) satellite observations and the thermosphere-ionosphere-mesosphere electrodynamics general circulation model (TIME-GCM) simulations. A QTDW with westward s = 2 (W2) is identified in the mesosphere and lower thermosphere (MLT) region in TIMED/Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) temperature and TIMED/TIMED Doppler Imager (TIDI) wind observations during 2011/2012 austral summer period, which coincides with a strong SPW1 episode at high latitude of the northern winter hemisphere. The temperature perturbation of W2 QTDW reaches a maximum amplitude of~8 K at~30°S and~88 km in the Southern Hemisphere, with a smaller amplitude in the Northern Hemisphere at similar latitude and minimum amplitude at the equator. The maximum meridional wind amplitude of the W2 QTDW is observed to be~40 m/s at 95 km in the equatorial region. The TIME-GCM is utilized to simulate the nonlinear interactions between W3 QTDW and SPW1 by specifying both W3 QTDW and SPW1 perturbations at the lower model boundary. The model results show a clear W2 QTDW signature in the MLT region, which agrees well with the TIMED/SABER temperature and TIMED/TIDI horizontal wind observations. We conclude that the W2 QTDW during the 2011/2012 austral summer period results from the nonlinear interaction between W3 QTDW and SPW1.

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Section: Resultsmentioning

confidence: 99%

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Liu

et al. 2015

JGR Space Physics

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“…The QTDW structure is known to be manifested simultaneously in both wind and temperature fields in numerical experiments [ Palo et al , 1999; Chang et al , 2011a], as well as in observations such as that using the Microwave Limb Sounder (MLS) aboard the Earth Observing System by Limpasuvan and Wu [2009], and in SABER and TIDI by Gu et al [2013]. QTDW temperature amplitudes have also been used extensively in past studies due to the availability of temperature soundings over a broad vertical domain from instruments such as SABER [ Palo et al , 2007; Chang et al , 2011b; Moudden and Forbes , 2014] and MLS [ Limpasuvan and Wu , 2009; Tunbridge et al , 2011], thus providing a large body of past work for intercomparison. Our results for the QTDW using SABER are consistent with these past studies.…”

Section: Methodsmentioning

confidence: 99%

Quasi two day wave‐related variability in the background dynamics and composition of the mesosphere/thermosphere and the ionosphere

et al. 2014

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Dissipating planetary waves in the mesosphere/lower thermosphere (MLT) region may cause changes in the background dynamics of that region, subsequently driving variability throughout the broader thermosphere/ionosphere system via mixing due to the induced circulation changes. We report the results of case studies examining the possibility of such coupling during the northern winter in the context of the quasi two day wave (QTDW)—a planetary wave that recurrently grows to large amplitudes from the summer MLT during the postsolstice period. Six distinct QTDW events between 2003 and 2011 are identified in the MLT using Sounding of the Atmosphere using Broadband Emission Radiometry temperature observations. Concurrent changes to the background zonal winds, zonal mean column O/N2 density ratio, and ionospheric total electron content (TEC) are examined using data sets from Thermosphere Ionosphere Mesosphere Energetics and Dynamics Doppler Interferometer, Global Ultraviolet Imager, and Global Ionospheric Maps, respectively. We find that in the 5–10 days following a QTDW event, the background zonal winds in the MLT show patterns of eastward and westward anomalies in the low and middle latitudes consistent with past modeling studies on QTDW-induced mean wind forcing, both below and at turbopause altitudes. This is accompanied by potentially related decreases in zonal mean thermospheric column O/N2, as well as to low-latitude TECs. The recurrent nature of the above changes during the six QTDW events examined point to an avenue for vertical coupling via background dynamics and chemistry of the thermosphere/ionosphere not previously observed.Key PointsDissipating planetary waves (PWs) in the MLT can drive background wind changesMixing from dissipating PWs drive thermosphere/ionosphere composition changesFirst observations of QTDW-driven variability from this mechanism

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“…This method has been used previously for Aura MLS temperature and geopotential data analysis (e.g. Limpasuvan et al, 2005;Baumgaertner et al, 2008;Limpasuvan and Wu, 2009;McDonald et al, 2011). The advantage of this method is that it can utilise a non-uniform or irregular sampling pattern, but is less computationally intensive than alternative methods such as FFT or asynoptic transforms.…”

Section: Data Alysismentioning

confidence: 99%

Aura MLS observations of the westward-propagating <i>s</i>=1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere

2011

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Abstract. The Microwave Limb Sounder (MLS) on the Aura satellite has been used to measure temperatures in the stratosphere, mesosphere and lower thermosphere. The data used here are from August 2004 to December 2010 and latitudes 75 • N to 75 • S. The temperature data reveal the regular presence of a westward-propagating 16-day planetary wave with zonal wavenumber 1. The wave amplitudes maximise in winter at middle to high latitudes, where monthly-mean amplitudes can be as large as ∼8 K. Significant wave amplitudes are also observed in the summer-time mesosphere and lower thermosphere (MLT) and at lower stratospheric heights of up to ∼20 km at middle to high latitudes. Wave amplitudes in the Northern Hemisphere approach values twice as large as those in the Southern Hemisphere. Wave amplitudes are also closely related to mean zonal winds and are largest in regions of strongest eastward flow. There is a reduction in wave amplitudes at the stratopause. No significant wave amplitudes are observed near the equator or in the strongly westward background winds of the atmosphere in summer. This behaviour is interpreted as a consequence of wave/mean-flow interactions. Perturbations in wave amplitude summer MLT are compared to those simultaneously observed in the winter stratosphere of the opposite hemisphere and found to have a correlation coefficient of +0.22, suggesting a small degrees of inter-hemispheric coupling. We interpret this to mean that some of the summer-time MLT wave may originate in the winter stratosphere of the opposite hemisphere and have been ducted across the equator. We do not observe a significant QBO modulation of the 16-day wave amplitude in the polar

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Anomalous two‐day wave behavior during the 2006 austral summer

Cited by 48 publications

References 23 publications

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Quasi two day wave‐related variability in the background dynamics and composition of the mesosphere/thermosphere and the ionosphere

Aura MLS observations of the westward-propagating <i>s</i>=1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere

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Anomalous two‐day wave behavior during the 2006 austral summer

Cited by 48 publications

References 23 publications

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Evidence of nonlinear interaction between quasi 2 day wave and quasi‐stationary wave

Quasi two day wave‐related variability in the background dynamics and composition of the mesosphere/thermosphere and the ionosphere

Aura MLS observations of the westward-propagating &lt;i&gt;s&lt;/i&gt;=1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere

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Aura MLS observations of the westward-propagating <i>s</i>=1, 16-day planetary wave in the stratosphere, mesosphere and lower thermosphere