Morphology of the tropopause layer and lower stratosphere above a tropical cyclone: a case study on cyclone Davina (1999)

Cairo, F.; Buontempo, Carlo; Mackenzie, Adrian; Schiller, C.; Volk, C. M.; Adriani, A.; Mitev, Valentin; Matthey, Renaud; Donfrancesco, G. Di; Oulanovsky, A.; Ravegnani, F.; Yushkov, V.; Snels, M.; Cagnazzo, Chiara; Stefanutti, L.

doi:10.5194/acp-8-3411-2008

Cited by 42 publications

(49 citation statements)

References 68 publications

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“…The tropical cyclones (TCs) are severe weather events often leading to deep convective activity and persisting for long time. They alter the physics and chemistry of the TTL and they play a fundamental role on the atmospheric circulation and troposphere-stratosphere exchange (Ray and Rosenlof, 2007;Cairo et al, 2008;Fueglistaler et al, 2009;Romps and Kuang, 2009). The GPS Radio Occultation (RO) technique (Kursinki et al, 1997) is useful to study severe weather phenomena because the GPS signal is independent on the weather conditions and it allows profiling atmospheric parameters with high vertical resolution and accuracy.…”

Section: Introductionmentioning

confidence: 99%

Radio occultation bending angle anomalies during tropical cyclones

Biondi¹,

Neubert²,

Syndergaard

et al. 2011

Atmos. Meas. Tech.

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Abstract. The tropical deep convection affects the radiation balance of the atmosphere changing the water vapor mixing ratio and the temperature of the upper troposphere lower stratosphere. The aim of this work is to better understand these processes and to investigate if severe storms leave a significant signature in radio occultation profiles in the tropical tropopause layer. Using tropical cyclone best track database and data from different GPS radio occultation missions (COSMIC, GRACE, CHAMP, SACC and GPSMET), we selected 1194 profiles in a time window of 3 h and a space window of 300 km from the eye of the cyclone. We show that the bending angle anomaly of a GPS radio occultation signal is typically larger than the climatology in the upper troposphere and lower stratosphere and that a double tropopause during deep convection can easily be detected using this technique. Comparisons with co-located radiosondes, climatology of tropopause altitudes and GOES analyses are also shown to support the hypothesis that the bending angle anomaly can be used as an indicator of convective towers. The results are discussed in connection to the GPS radio occultation receiver which will be part of the Atomic Clock Ensemble in Space (ACES) payload on the International Space Station.

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Section: Introductionmentioning

confidence: 99%

Radio occultation bending angle anomalies during tropical cyclones

Biondi¹,

Neubert²,

Syndergaard

et al. 2011

Atmos. Meas. Tech.

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“…The increased ozone levels in the boundary layer as well as the near surface by as much as 20 to 30 ppbv due to strong downward transport of ozone in the tropical convection is also observed (Betts et al, 2002;Sahu and Lal, 2006;Grant et al, 2008). Cairo et al (2008) reported that the colder temperatures are observed in the tropical tropopause layer (TTL) region during Cyclone Davina and also reported on the impact of the TCs on the UTLS structure and dynamics at a regional scale. A detailed review on the effect of TCs on the UTLS can be found in same report.…”

Section: Introductionmentioning

confidence: 95%

Effect of tropical cyclones on the stratosphere–troposphere exchange observed using satellite observations over the north Indian Ocean

et al. 2016

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Abstract. Tropical cyclones play an important role in modifying the tropopause structure and dynamics as well as stratosphere-troposphere exchange (STE) processes in the upper troposphere and lower stratosphere (UTLS) region. In the present study, the impact of cyclones that occurred over the north Indian Ocean during 2007-2013 on the STE processes is quantified using satellite observations. Tropopause characteristics during cyclones are obtained from the Global Positioning System (GPS) radio occultation (RO) measurements, and ozone and water vapour concentrations in the UTLS region are obtained from Aura Microwave Limb Sounder (MLS) satellite observations. The effect of cyclones on the tropopause parameters is observed to be more prominent within 500 km of the centre of the tropical cyclone. In our earlier study, we observed a decrease (increase) in the tropopause altitude (temperature) up to 0.6 km (3 K), and the convective outflow level increased up to 2 km. This change leads to a total increase in the tropical tropopause layer (TTL) thickness of 3 km within 500 km of the centre of cyclone. Interestingly, an enhancement in the ozone mixing ratio in the upper troposphere is clearly noticed within 500 km from the cyclone centre, whereas the enhancement in the water vapour in the lower stratosphere is more significant on the south-east side, extending from 500 to 1000 km away from the cyclone centre. The cross-tropopause mass flux for different intensities of cyclones is estimated and it is found that the mean flux from the stratosphere to the troposphere for cyclonic storms is 0.05 ± 0.29 × 10 −3 kg m −2 , and for very severe cyclonic storms it is 0.5 ± 1.07 × 10 −3 kg m −2 . More downward flux is noticed on the north-west and south-west side of the cyclone centre. These results indicate that the cyclones have significant impact in effecting the tropopause structure, ozone and water vapour budget, and consequentially the STE in the UTLS region.

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“…Deep convection in typhoons (or tropical cyclones) provides a preferred condition for stratosphere-troposphere exchange [1,2] that causes the variability of ozone in the upper troposphere and lower stratosphere. The injection of tropospheric ozone-poor air into the lower stratosphere near the typhoon's eye has been observed based on the aircraft measurements [3][4][5][6][7] and satellite data [8][9][10][11]. Moreover, stratospheric ozone-rich air intrusion into the troposphere due to the subsidence in the eye of typhoons has been reported [3,5,12,13].…”

mentioning

confidence: 98%

“…These typhoon-related ozone episodes are generally believed to be the results of tropospheric air upwelled by deep convection and ozone-rich stratospheric air downwelled by intrusion [6,8,10,13]. Although there are discrepancies between the total column ozone derived from satellites and aircraft observations in typhoons' eyes [7,12], the regions of high column ozone inside the eye regions are observed during intense stages of typhoons [6]. Additionally, typhoon not only influences the local ozone budget, but also has an impact on the ozone meridional transport [14].…”

mentioning

confidence: 99%

“…Additionally, typhoon not only influences the local ozone budget, but also has an impact on the ozone meridional transport [14]. Based on backward trajectory analysis, ozone transported between midlatitude and tropics was influenced by the large-scale circulation coupled with a typhoon [7,14,15]. However, the variability of ozone vertical structure during the typhoon processes has not been well investigated.…”

mentioning

confidence: 99%

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Ozone vertical variations during a typhoon derived from the OMI observations and reanalysis data

Xian

Lü

et al. 2013

Chin. Sci. Bull.

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Typhoon is considered to play a key role in the dynamical exchange processes taking place between the troposphere and stratosphere. In this paper, the impact of typhoon on the ozone distribution in the upper troposphere and middle stratosphere is investigated using ozone profiles measured by Aura's Ozone Monitoring Instrument and meteorological fields from reanalysis data. During the passage of Typhoon Hai-Tang in 2005 over the western North Pacific, low values of ozone column above 200 hPa and ozone mixing ratio between the upper troposphere and the middle stratosphere (from 200 to 50 hPa) are observed right above the typhoon's track, a result due to the strong upward propagation of air associated with overshooting convection in typhoon. A comparative analysis of different stages of Hai-Tang suggests that in the region where typhoon has higher intensity the troposphere-to-stratosphere transport is enhanced. These results indicated that the typhoon has a significant impact on the ozone variation in the upper troposphere and the middle stratosphere.

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Morphology of the tropopause layer and lower stratosphere above a tropical cyclone: a case study on cyclone Davina (1999)

Cited by 42 publications

References 68 publications

Radio occultation bending angle anomalies during tropical cyclones

Radio occultation bending angle anomalies during tropical cyclones

Effect of tropical cyclones on the stratosphere–troposphere exchange observed using satellite observations over the north Indian Ocean

Ozone vertical variations during a typhoon derived from the OMI observations and reanalysis data

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