Vertical short‐scale structures in the upper tropospheric and lower stratospheric temperature and ozone at la Réunion Island (20.8°S 55.3°E)

Chane-Ming, Fabrice; Molinaro, Franck; Leveau, Jean; Keckhut, Philippe; Hauchecorne, Alain; Godin, S.

doi:10.1029/2000jd900199

Cited by 13 publications

(9 citation statements)

References 50 publications

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“…Vertical short-scale structures with vertical wavelengths of 1-5 km produced by GW and large-scale advection were analyzed in the UT/LS above La Réunion using ozonesonde data (Chane-Ming et al, 2000b). Dominant GW sources are revealed to be convection in summer and the subtropical jet in winter.…”

Section: Discussionmentioning

confidence: 99%

“…Tromelin is a 1 km 2 sandy desert island peaking at 7 m above the sea level (Chane-Ming et al, 2002). La Réunion with a surface of 2512 km 2 is located at the border of the tropical belt under tropical and subtropical conditions respectively during austral summer and during austral winter (Chane-Ming et al, 2000b). The dataset includes GPS radiosonde data at Mahé and Tromelin and Väisälä RS80 ozonesonde and Raman lidar measurements at La Réunion.…”

Section: Experimental Datamentioning

confidence: 99%

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Latitudinal and seasonal variability of gravity-wave energy in the South-West Indian Ocean

2007

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Abstract. Vertical temperature profiles obtained by radiosonde and Raman lidar measurements are used to investigate a climatology of total energy density of gravity waves (GW) in the Upper Troposphere (UT) and the Lower Stratosphere (LS) from 1992 to 2004 above Mahé (4 • S, 55 • E), Tromelin (15 • S, 54 • E) and La Réunion (21 • S, 55 • E) located in the tropical South-West Indian Ocean. The commonly used spectral index value (p≈5/3) of the intrinsic frequency spectrum is used for calculating estimated total energy density in the UT and LS. Estimated total energy density provides good estimation of total energy density in the LS but underestimates total energy density by one half in the UT above Mahé and Tromelin probably due to the activity of near-inertial frequency waves. Estimated total energy density reveals a strong seasonal variability as a function of latitude and convection as an evident active source of GW activity in the LS in austral summer. Above La Réunion, a semi-annual GW activity is observed in the LS with the signature of the subtropical barrier in the UT. Moreover, radiosondes and Raman lidar provide consistent GW surveys in the UT/LS at heights<23 km above La Réunion.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

Latitudinal and seasonal variability of gravity-wave energy in the South-West Indian Ocean

2007

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“…Less than 5 DU of this difference is due to the tropopause being lower in SON than in MAM. The tropopause is normally between 16 and 18 km except for Réunion and Irene, where the tropopause sometimes falls below 14 km [ Chane‐Ming et al , 2000].…”

Section: Total and Stratospheric Ozone And Quasi‐biennial Oscillationmentioning

confidence: 99%

Southern Hemisphere Additional Ozonesondes (SHADOZ) 1998–2000 tropical ozone climatology 2. Tropospheric variability and the zonal wave‐one

Thompson

Witte

Oltmans³

et al. 2003

J. Geophys. Res.

242

282

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The first view of stratospheric and tropospheric ozone variability in the Southern Hemisphere tropics is provided by a 3‐year record of ozone soundings from the Southern Hemisphere Additional Ozonesondes (SHADOZ) network (http://croc.gsfc.nasa.gov/shadoz). Observations covering 1998–2000 were made over Ascension Island, Nairobi (Kenya), Irene (South Africa), Réunion Island, Watukosek (Java), Fiji, Tahiti, American Samoa, San Cristóbal (Galapagos), and Natal (Brazil). Total, stratospheric, and tropospheric column ozone amounts usually peak between August and November. Other features are a persistent zonal wave‐one pattern in total column ozone and signatures of the quasi‐biennial oscillation (QBO) in stratospheric ozone. The wave‐one is due to a greater concentration of free tropospheric ozone over the tropical Atlantic than the Pacific and appears to be associated with tropical general circulation and seasonal pollution from biomass burning. Tropospheric ozone over the Indian and Pacific Oceans displays influences of the waning 1997–1998 El Niño, seasonal convection, and pollution transport from Africa. The most distinctive feature of SHADOZ tropospheric ozone is variability in the data, e.g., a factor of 3 in column amount at 8 of 10 stations. Seasonal and monthly means may not be robust quantities because statistics are frequently not Gaussian even at sites that are always in tropical air. Models and satellite retrievals should be evaluated on their capability for reproducing tropospheric variability and fine structure. A 1999–2000 ozone record from Paramaribo, Surinam (6°N, 55°W) (also in SHADOZ) shows a marked contrast to southern tropical ozone because Surinam is often north of the Intertropical Convergence Zone (ITCZ). A more representative tropospheric ozone climatology for models and satellite retrievals requires additional Northern Hemisphere tropical data.

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“…The selected height layers reduce noise from both the measurements and the analysis as well from the dispersion of highly‐derived spectral parameters. The intensity is based on the “elementary” total energy which is the sum of the “elementary” CWT potential and kinetic energies [ Chane‐Ming et al , 2000b]. Wave energy propagates upward (downward) when the ω/ m ratio is negative (positive) [ Gill , 1982].…”

Section: Data Description and Analysismentioning

confidence: 99%

Gravity wave characteristics over Tromelin Island during the passage of cyclone Hudah

Chane-Ming¹,

Roff

Robert³

et al. 2002

Geophysical Research Letters

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The time and spatial evolution of gravity‐wave characteristics are analysed using wavelets in vertical profiles of temperature and winds at Tromelin Island (15.53°S, 54.31°E) during the passage of the intense tropical cyclone Hudah in the Southern Ocean Indian Basin in 2000. Inertia‐gravity waves were observed in the upper troposphere and the lower stratosphere with dominant vertical wavelengths of 1.5–3 km, horizontal wavelengths <2000 km and periods of 0.6–1.6 days. Large amounts of gravity‐wave energy were detected during landfalls of the tropical cyclone. The distribution of total energy indicates that mesoscale convective structures such as tropical cyclones are important gravity‐wave sources in the upper troposphere.

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Vertical short‐scale structures in the upper tropospheric and lower stratospheric temperature and ozone at la Réunion Island (20.8°S 55.3°E)

Cited by 13 publications

References 50 publications

Latitudinal and seasonal variability of gravity-wave energy in the South-West Indian Ocean

Latitudinal and seasonal variability of gravity-wave energy in the South-West Indian Ocean

Southern Hemisphere Additional Ozonesondes (SHADOZ) 1998–2000 tropical ozone climatology 2. Tropospheric variability and the zonal wave‐one

Gravity wave characteristics over Tromelin Island during the passage of cyclone Hudah

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