Quasi‐Lagrangian measurements in the lower stratosphere reveal an energy peak associated with near‐inertial waves

Hertzog, Albert; Vial, F.; Mechoso, Carlos R.; Basdevant, C.; Cocquerez, Philippe

doi:10.1029/2001gl014083

Cited by 50 publications

(63 citation statements)

References 19 publications

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“…These features, fully consistent with the theory, demonstrate the ability of SPB flights to resolve gravity-wave motions. Furthermore, in the highfrequency gravity-wave band, the picture clearly exhibits a slope of −2, which seems to be a robust feature of gravitywave energy in the stratosphere (Hertzog et al, 2002). On the other hand, the low-frequency part of the spectra is likely associated with Rossby waves, which are more visible on the mid-latitude flight.…”

Section: Impact Of Convective Lofting and Meridional Exchange At The mentioning

confidence: 95%

An overview of the HIBISCUS campaign

et al. 2011

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Abstract. The EU HIBISCUS project consisted of a series of field campaigns during the intense convective summers in 2001, 2003 and 2004 in the State of São Paulo in Brazil. Its objective was to investigate the impact of deep convection on the Tropical Tropopause Layer (TTL) and the lower stratosphere by providing a new set of observational data on meteorology, tracers of horizontal and vertical transport, water vapour, clouds, and chemistry in the tropical Upper Troposphere/Lower Stratosphere (UT/LS). This was achieved using short duration research balloons to study local phenomena associated with convection over land, and long-durationCorrespondence to: J.-P. Pommereau (jean-pierre.pommereau@latmos.ipsl.fr) balloons circumnavigating the globe to study the contrast between land and oceans.Analyses of observations of short-lived tracers, ozone and ice particles show strong episodic local updraughts of cold air across the lapse rate tropopause up to 18 or 19 km (420-440 K) in the lower stratosphere by overshooting towers. The long duration balloon and satellite measurements reveal a contrast between the composition of the lower stratosphere over land and oceanic areas, suggesting significant global impact of such events. The overshoots are shown to be well captured by non-hydrostatic meso-scale Cloud Re- Weather Forecast Models (NWP) underestimating the overshooting process. Finally, the data collected by the HIBIS-CUS balloons have allowed a thorough evaluation of temperature NWP analyses and reanalyses, as well as satellite ozone, nitrogen oxide, water vapour and bromine oxide measurements in the tropics.

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Section: Impact Of Convective Lofting and Meridional Exchange At The mentioning

confidence: 95%

An overview of the HIBISCUS campaign

et al. 2011

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“…Nastrom et al (1997) hypothesized that near-inertial frequency waves might be responsible of an excess of GW kinetic energy in the LS. More recently, intrinsic-frequency spectra derived from quasi-lagrangian measurements reveal that such large values are due an enhancement of wave activity at nearinertial frequencies (Hertzog et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

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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“…Supported by various observations (e.g., Sato, 1994;Nastrom et al, 1997;Cot, 2001;Hertzog and Vial, 2001;Hertzog et al, , 2002Tsuda et al, 2004) the intrinsic frequencyω spectrum of the GW total wave energy density often is assumed to decrease withω −p for large values ofω and typically a value of p=5/3 is used.…”

Section: Introductionmentioning

confidence: 99%

Some experimental constraints for spectral parameters used in the Warner and McIntyre gravity wave parameterization scheme

2006

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Abstract. In order to incorporate the effect of gravity waves (GWs) on the atmospheric circulation most global circulation models (GCMs) employ gravity wave parameterization schemes. To date, GW parameterization schemes in GCMs are used without experimental validation of the set of global parameters assumed for the GW launch spectrum. This paper focuses on the Warner and McIntyre GW parameterization scheme. Ranges of parameters compatible with absolute values of gravity wave momentum flux (GW-MF) derived from CRISTA-1 and CRISTA-2 satellite measurements are deduced for several of the parameters and the limitations of both model and measurements are discussed. The findings presented in this paper show that the initial guess of spectral parameters provided by Warner and McIntyre (2001) are some kind of compromise with respect to agreement of absolute values and agreement of the horizontal structures found in both measurements and model results. Better agreement can be achieved by using a vertical wavenumber launch spectrum with a wider saturated spectral range and reduced spectral power in the unsaturated part. However, even with this optimized set of global launch parameters not all features of the measurements are matched. This indicates that for further improvement spatial and seasonal variations of the launch parameters should be included in GW parameterization schemes.

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Quasi‐Lagrangian measurements in the lower stratosphere reveal an energy peak associated with near‐inertial waves

Cited by 50 publications

References 19 publications

An overview of the HIBISCUS campaign

An overview of the HIBISCUS campaign

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

Some experimental constraints for spectral parameters used in the Warner and McIntyre gravity wave parameterization scheme

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