Titre du document / Document title

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

Auteur(s) / Author(s)

HERTZOG A. ⁽¹⁾ ; VIAL F. ⁽¹⁾ ; MECHOSO C. R. ⁽²⁾ ; BASDEVANT C. ⁽¹⁾ ; COCQUEREZ P. ⁽³⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Laboratoire de Météorologie Dynamique, École Polytechnique, Palaiseau, FRANCE
⁽²⁾ Department of Atmospheric Sciences, University of California, Los Angeles, ETATS-UNIS
⁽³⁾ CNES balloon division, Toulouse, FRANCE

Résumé / Abstract

[1] In March 2001, three superpressure balloons were launched from Kiruna, Sweden (67.9°N, 21.1°E). The balloons drifted for several weeks in the stratospheric polar vortex at about 19 km. The corresponding trajectories exhibit cycloid-like patterns due to the presence of near-inertial waves. Consistently, it is found that the intrinsic-frequency spectra of the horizontal velocity components are enhanced around the inertial frequency in reference to the generally assumed power-law distribution. A large spectral gap is also found between gravity waves and Rossby waves in the polar stratosphere, in contrast to the continuum found in the equatorial lower stratosphere.

Revue / Journal Title

Geophysical research letters   ISSN 0094-8276   CODEN GPRLAJ 

Source / Source

2002, vol. 29, n^o8, pp. 70.1-70.4 (20 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Geophysical Union, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

Europe ; Sweden ; Balloon observation ; Lagrangian method ; Rossby wave ; Gravity wave ; Atmospheric dynamics ; Trajectory ; Polar vortex ; Inertial wave ; Stratosphere ;

Mots-clés français / French Keywords

Europe ; Suède ; Observation par ballon ; Méthode Lagrange ; Onde Rossby ; Onde gravité ; Dynamique atmosphérique ; Trajectoire ; Tourbillon polaire ; Onde inertie ; Stratosphère ;

Mots-clés espagnols / Spanish Keywords

Europa ; Suecia ; Observación por balón ; Método Lagrange ; Onda Rossby ; Onda gravedad ; Dinámica atmosférica ; Trayectoria ; Vórtice polar ; Onda inercial ; Estratosfera ;

Localisation / Location

INIST-CNRS, Cote INIST : 16687, 35400010907013.0700