Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar

Hence, Deanna A.; Houze, Robert A.

doi:10.1175/jas-d-11-0323.1

Cited by 89 publications

(85 citation statements)

References 42 publications

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“…1a and 1b). Observations have indicated that downdrafts in an outer rainband tend to form in two distinct sectors-namely, the upwind convective sector (Barnes et al 1983;Powell 1990a,b;Hence and Houze 2008;Didlake and Houze 2009) and the downwind stratiform sector (Didlake and Houze 2013b). 1).…”

Section: A Intensitymentioning

confidence: 59%

Impacts of Evaporation of Rainwater on Tropical Cyclone Structure and Intensity—A Revisit

Wang

Duan

2015

Journal of the Atmospheric Sciences

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The impact of evaporation of rainwater on tropical cyclone (TC) intensity and structure is revisited in this study. Evaporative cooling can result in strong downdrafts and produce low-equivalent potential temperature air in the inflow boundary layer, particularly in the region outside the eyewall, significantly suppressing eyewall convection and reducing the final intensity of a TC. Different from earlier findings, results from this study show that outer rainbands still form but are short lived in the absence of evaporation. Evaporation of rainwater is shown to facilitate the formation of outer rainbands indirectly by reducing the cooling due to melting of ice particles outside the inner core, not by the cold-pool dynamics, as previously believed. Only exclusion of evaporation in the eyewall region or the rapid filamentation zone has a very weak effect on the inner-core size change of a TC, whereas how evaporation in the outer core affects the inner-core size depends on how active the inner rainbands are. More (less) active inner rainbands may lead to an increase (a decrease) in the inner-core size.

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Section: A Intensitymentioning

confidence: 59%

Impacts of Evaporation of Rainwater on Tropical Cyclone Structure and Intensity—A Revisit

Wang

Duan

2015

Journal of the Atmospheric Sciences

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“…Mitra (1996) and Das (2009) reported the weakening of the tropopause during the passage of a tropical cyclone. A detailed study on the dynamical and thermodynamical structure of a tropical cyclone can be found in Hence and Houze Jr. (2012) and the review article on clouds in the tropical cyclone can be found in Houze Jr. (2010). Thus, the tropical cyclones have an influence on the stratosphere-troposphere exchange process which causes air mass and energy transports in the tro- posphere and redistribution of stratospheric ozone (e.g.…”

Section: S S Das Et Al: Influence Of Tropical Cyclones On Troposphmentioning

confidence: 99%

Influence of tropical cyclones on tropospheric ozone: possible implications

et al. 2016

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Abstract. The present study examines the role of tropical cyclones in the enhancement of tropospheric ozone. The most significant and new observation reported is the increase in the upper-tropospheric (10-16 km) ozone by 20-50 ppbv, which has extended down to the middle (6-10 km) and lower troposphere ( < 6 km). The descent rate of enhanced ozone layer during the passage of tropical cyclone is 0.8-1 km day −1 , which is three times that of a clear-sky day (non-convective). Enhancement of surface ozone concentration by ∼ 10 ppbv in the daytime and 10-15 ppbv in the night-time is observed during a cyclone. Potential vorticity, vertical velocity and potential temperature obtained from numerical simulation, reproduces the key feature of the observations. A simulation study indicates the downward transport of stratospheric air into the troposphere. Space-borne observations of relative humidity indicate the presence of sporadic dry air in the upper and middle troposphere over the cyclonic region. These observations quantitatively constitute experimental evidence of redistribution of stratospheric ozone during cyclonic storms.

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“…Spiral rainbands may produce severe rainfall outside the eye wall and play an important role in changing the dynamic structure of a TC, especially in the formation of concentric eye walls (Wang and Wu, 2004;Hence and Houze, 2012). They can be triggered both by inertia GWs (Willoughby, 1978) and vortex Rossby waves (Montgomery and Kallenbach 1997).…”

Section: Characteristics Of Tc Rainbandsmentioning

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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Vertical Structure of Tropical Cyclone Rainbands as Seen by the TRMM Precipitation Radar

Cited by 89 publications

References 42 publications

Impacts of Evaporation of Rainwater on Tropical Cyclone Structure and Intensity—A Revisit

Impacts of Evaporation of Rainwater on Tropical Cyclone Structure and Intensity—A Revisit

Influence of tropical cyclones on tropospheric ozone: possible implications

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

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