Elliptical Structures of Gravity Waves Produced by Typhoon Soudelor in 2015 near Taiwan

Ming, Fabrice Chane; Jolivet, Samuel; Liou, Yuei An; Jégou, Fabrice; Mékies, Dominique; Hong, Jiman

doi:10.3390/atmos10050260

Cited by 8 publications

(8 citation statements)

References 76 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…lat). Now, in effort to examine the presence of upward propagating GWs from this deep convective region, the vertical temperature profiles obtained from GPS-RO measurements at an altitude range of 10-40 km were filtered using a high pass fourth-order Butter-worth filter with a cut-off at 7 km (Ming et al, 2019). Figures 6a and 6d show the geographic locations of three available GPS-RO soundings close to TC Victoria superimposed on the half hourly averaged brightness temperature at 11 UT on 8 and 9 April, respectively.…”

Section: 1029/2020ja028003mentioning

confidence: 99%

On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

Ajith

Ram

et al. 2020

JGR Space Physics

View full text Add to dashboard Cite

Understanding the day-today variability of equatorial plasma bubble (EPB) irregularities has been a major challenge for many decades that makes the deterministic prediction of EPBs remain elusive. In the present study, we report a case of intense and periodic EPBs observed during 8 and 9 April 2013 by the 47-MHz Equatorial Atmosphere Radar at Kototabang, Indonesia. The periodic EPBs separated by about 200-250 km were initiated before sunset. The presunset onset and development of these periodic EPBs were discussed in light of the gravity waves (GWs) excited in connection with the deep convection due to the tropical cyclone (TC) Victoria. The outgoing long-wave radiation measurement by very high-resolution radiometer (VHRR) onboard Indian meteorological satellite Kalpana-1 shows the occurrence of deep convective activity during these days. The presence of upward propagating GWs from the deep convective region associated with TC Victoria was confirmed using the GPS radio occultation (GPS-RO) observations in the troposphere and stratosphere. The GW signatures at ionospheric altitudes were also observed from the Ionosonde observations over magnetic equator, and medium-scale (~300 km) GWs were observed from the GPS-TEC (Total Electron Content) data near to the magnetic equator and cyclone center. From the GW parameters observed from GPS-TEC and GPS-RO, we surmise that the secondary GWs generated by the dissipation of primary GWs associated with TC Victoria could have served as a seeding source on the generation of periodic EPBs during these two consecutive days.

show abstract

Section: 1029/2020ja028003mentioning

confidence: 99%

On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

Ajith

Ram

et al. 2020

JGR Space Physics

View full text Add to dashboard Cite

show abstract

“…Intrusion of water vapor into the stratosphere has significant impact on the climate change. The hodograph method can suggest the vertical energy propagation direction of GWs, as per linear dispersion relation of GW (Chane Ming et al, ; Ganguly et al, ; Vincent & Joan Alexander, ). An earlier study over Kolkata using radiosonde observations revealed that convective activities enhanced relative humidity in LS (Ganguly et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…It is also seen that gravity wave energy produced during tropical cyclones is higher than generated by local convections (Chane‐Ming et al, ). Researchers have also reported the sensitivity of the atmospheric chemistry and climate on the changing tropical lower stratosphere (Chane Ming et al, ).…”

Section: Introductionmentioning

confidence: 99%

Gravity Wave Activities Associated With Convective Phenomena at a Tropical Location Near Land‐Sea Boundary

2020

View full text Add to dashboard Cite

The seasonal analysis of gravity wave activity has been made for the present tropical location, Kolkata (22.5726°N, 88.3639°E) using radiosonde and European Centre for Medium-Range Weather Forecasts 60 model level data. Gravity wave generated due to intense tropical cyclone Aila has also been investigated using European Centre for Medium-Range Weather Forecasts 91 model level data over the Indian region. The gravity wave energy calculated from temperature and wind perturbation profiles show a significant enhancement during convective activities as indicated by a low outgoing longwave radiation. The pattern of zonal and meridional wind shears plays an important role in determining the seasonal variation of gravity wave activities. An intrusion of water vapor into the lower stratosphere over the cyclone affected region is detected from European Centre for Medium-Range Weather Forecasts 91 model level data. The dominant vertical wavelengths of gravity waves in the range of 2.5-3.2 km are found from spectral analysis of wind and temperature perturbations during the tropical cyclone.

show abstract

“…After the early period of interest in gravity waves as a mechanism for spiral bands, the large majority of research on TCs and gravity waves was concerned with the deeper, longer waves that propagate upward into the stratosphere and mesosphere (e.g., Pfister et al 1993; Kim and Chun 2005;Kim et al 2009;Kuester et al 2008;Chane Ming et al 2010;Niranjan Kumar et al 2011;Chane Ming et al 2019). These generally have wavelengths from tens to hundreds of kilometers.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Spiral Gravity Waves Radiating from Tropical Cyclones Using a Linear, Nonhydrostatic Model

Nolan

2020

Journal of the Atmospheric Sciences

View full text Add to dashboard Cite

A recent study showed observational and numerical evidence for small-scale gravity waves that radiate outward from tropical cyclones. These waves are wrapped into tight spirals by the radial and vertical shears of the tangential wind field. Reexamination of the previously studied tropical cyclone simulations suggests that the dominant source for these waves are convective asymmetries rotating along the eyewall, modulated in intensity by the preferred convection region on the left side of the environmental wind shear vector. A linearized, nonhydrostatic model for perturbations to a balanced vortex is used to study the waves. Forcing the linear model with rotating and pulsing asymmetric heat sources generates radiating gravity waves with multiple vertical and horizontal structures. The pulsation of the rotating heat source generates two types of waves: fast, deep waves with larger radial wavelengths, and slower, secondary waves with shorter radial and vertical wavelengths. The deeper waves produce surface pressure oscillations that have time scales consistent with surface observations, whereas the shorter waves have little surface indication but produce oscillations in vertical velocity with shorter radial wavelengths that are consistent with aircraft observations. Convective forcing that is either not pulsing or not rotating produces gravity waves but they are not as similar to the observed or simulated waves. The effects of varying the intensity of the cyclone, the asymmetry of the forcing, and the static stability of the surrounding atmosphere are explored.

show abstract

Elliptical Structures of Gravity Waves Produced by Typhoon Soudelor in 2015 near Taiwan

Cited by 8 publications

References 76 publications

On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

On the Seeding of Periodic Equatorial Plasma Bubbles by Gravity Waves Associated With Tropical Cyclone: A Case Study

Gravity Wave Activities Associated With Convective Phenomena at a Tropical Location Near Land‐Sea Boundary

An Investigation of Spiral Gravity Waves Radiating from Tropical Cyclones Using a Linear, Nonhydrostatic Model

Contact Info

Product

Resources

About