Analysis on the global morphology of stratospheric gravity wave activity deduced from the COSMIC GPS occultation profiles

Xiao, Chunsheng; Hu, Xiong

doi:10.1007/s10291-009-0146-z

Cited by 10 publications

(7 citation statements)

References 60 publications

(78 reference statements)

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“…Therefore we can assume the total gravity wave energy to be proportional to potential energy, which can be calculated from temperature variance alone. It should be noted that the E p may be smaller than the E k and consequently E p may not adequately present the full GW energy if the atmospheric GW intrinsic frequency w is close to the inertial frequency f. For example, this case may occur at middle and high latitudes because the inertial frequencies at middle and high latitudes are considerably larger than those at low latitudes [Xiao and Hu, 2010].…”

Section: Data Analysesmentioning

confidence: 99%

A global morphology of gravity wave activity in the stratosphere revealed by the 8‐year SABER/TIMED data

Zhang¹,

Xiong²,

Liu³

et al. 2012

J. Geophys. Res.

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, we studied the activity of gravity waves in the stratosphere globally. Global distribution of stratospheric gravity wave potential energy was calculated from the temperature perturbations. Seasonal comparison of gravity wave potential energy E p shows an annual variation in middle and high latitudes and a semiannual variation in the tropics. Around the equator, gravity wave interannual enhancements are identified just below the zonal wind zero (u = 0) contours corresponding to descending eastward shear phase of the QBO. Furthermore, we provide observation evidence to support the conclusion that the deep convection is a major source for the observed tropical gravity wave activity. The considerable longitude variations of largest potential energy around the equator are related not only to the specific topography and tropical convections but also to many other factors. We can infer that topography and tropical deep convection are the important sources of the gravity waves in the stratosphere, but the observed gravity waves in the tropical/subtropical stratosphere are strongly affected by winds with different QBO phases.Citation: Zhang, Y., J. Xiong, L. Liu, and W. Wan (2012), A global morphology of gravity wave activity in the stratosphere revealed by the 8-year SABER/TIMED data,

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Section: Data Analysesmentioning

confidence: 99%

A global morphology of gravity wave activity in the stratosphere revealed by the 8‐year SABER/TIMED data

Zhang¹,

Xiong²,

Liu³

et al. 2012

J. Geophys. Res.

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“…A comprehensive introduction to the RO method for remote sensing of the atmosphere and ionosphere is presented in Liou et al (2010). COSMIC GPS RO profiles have recently been analysed to describe monthly global stratospheric GW energy densities Xiao and Hu, 2010).…”

Section: Methodsmentioning

confidence: 99%

Observation and a numerical study of gravity waves during tropical cyclone Ivan (2008)

et al. 2014

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Abstract. Gravity waves (GWs) with horizontal wavelengths of 32-2000 km are investigated during tropical cyclone (TC) Ivan (2008) in the southwest Indian Ocean in the upper troposphere (UT) and the lower stratosphere (LS) using observational data sets, radiosonde and GPS radio occultation data, ECMWF analyses and simulations of the French numerical model Meso-NH with vertical resolution < 150 m near the surface and 500 m in the UT/LS. Observations reveal dominant low-frequency GWs with short vertical wavelengths of 0.7-3 km, horizontal wavelengths of 80-400 km and periods of 4.6-13 h in the UT/LS. Continuous wavelet transform and image-processing tools highlight a wide spectrum of GWs with horizontal wavelengths of 40-1800 km, short vertical wavelengths of 0.6-3.3 km and periods of 20 min-2 days from modelling analyses. Both ECMWF and Meso-NH analyses are consistent with radiosonde and GPS radio occultation data, showing evidence of a dominant TCrelated quasi-inertia GW propagating eastward east of TC Ivan with horizontal and vertical wavelengths of 400-800 km and 2-3 km respectively in the LS, more intense during TC intensification. In addition, the Meso-NH model produces a realistic, detailed description of TC dynamics, some highfrequency GWs near the TC eye, variability of the tropospheric and stratospheric background wind and TC rainband characteristics at different stages of TC Ivan. A wave number 1 vortex Rossby wave is suggested as a source of dominant inertia GW with horizontal wavelengths of 400-800 km, while shorter scale modes (100-200 km) located at northeast and southeast of the TC could be attributed to strong localized convection in spiral bands resulting from wave number 2 vortex Rossby waves. Meso-NH simulations also reveal GWrelated clouds east of TC Ivan.

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“…remote sensing of the atmosphere and ionosphere is presented in Liou et al (2010). COSMIC GPS RO profiles have recently been analysed to describe monthly global stratospheric GW energy densities (Alexander et al, 2008;Xiao and Hu, 2010).…”

Section: Methodsmentioning

confidence: 99%

Observation and a numerical study of gravity waves during tropical cyclone Ivan~(2008)

Ming¹,

Ibrahim²,

Jolivet³

et al. 2013

Preprint

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Activity and spectral characteristics of gravity-waves (GWs) are analyzed during tropical cyclone (TC) Ivan (2008) in the troposphere and lower stratosphere using radiosonde and GPS radio occultation data, ECMWF outputs and simulations of French numerical model Meso-NH with vertical resolution varying between 150 m near the surface and 500 m in the lower stratosphere. Conventional methods for GW analysis and signal and image processing tools provide information on a wide spectrum of GWs with horizontal wavelengths of 40–1800 km and short vertical wavelengths of 0.6–10 km respectively and periods of 20 min–2 days. MesoNH model, initialized with Aladin-Réunion analyses, produces realistic and detailed description of TC dynamics, GWs, variability of the tropospheric and stratospheric background wind and TC rainband characteristics at different stages of TC Ivan. In particular a dominant eastward propagating TC-related quasi-inertia GW is present during intensification of TC Ivan with horizontal and vertical wavelengths of 400–600 km and 1.5–3.5 km respectively during intensification. A wavenumber-1 vortex Rossby wave is identified as a source of this medium-scale mode while short-scale modes located at north-east and south-east of the TC could be attributed to strong localized convection in spiral bands resulting from wavenumber-2 vortex Rossby waves. Meso-NH simulations also reveal high-frequency GWs with horizontal wavelengths of 20–80 km near the TC eye and high-frequency GWs-related clouds behind TC Ivan. In addition, GWs produced during landfall are likely to strongly contribute to background wind in the middle and upper troposphere as well as the stratospheric quasi-biennial oscillation

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Analysis on the global morphology of stratospheric gravity wave activity deduced from the COSMIC GPS occultation profiles

Cited by 10 publications

References 60 publications

A global morphology of gravity wave activity in the stratosphere revealed by the 8‐year SABER/TIMED data

A global morphology of gravity wave activity in the stratosphere revealed by the 8‐year SABER/TIMED data

Observation and a numerical study of gravity waves during tropical cyclone Ivan (2008)

Observation and a numerical study of gravity waves during tropical cyclone Ivan~(2008)

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