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The horizontal spectrum of vertical velocities near the tropopause from global to gravity-wave scales

Schumann, Ulrich (2019) The horizontal spectrum of vertical velocities near the tropopause from global to gravity-wave scales. Journal of the Atmospheric Sciences (76), Seiten 3847-3862. American Meteorological Society. doi: 10.1175/JAS-D-19-0160.1. ISSN 0022-4928.

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Offizielle URL: https://journals.ametsoc.org/doi/10.1175/JAS-D-19-0160.1

Kurzfassung

Vertical motions are fundamental for atmospheric dynamics. Compared to horizontal motions, the horizontal spectrum of vertical velocity (w) is less well known. Here, w-spectra are related to spectra of horizontal motions in the free atmosphere near the tropopause from global to gravity wave scales. At large scales, w is related to vertically-averaged horizontal divergent motions by continuity. At small scales, the velocity energy spectra reach anisotropy as in stably stratified turbulence. Combining these limits approximates the w-spectrum from global to small scales. The w-spectrum is flat at large scales when the divergent spectrum shows a -2-slope, reaches a maximum at mesoscales after transition to -5/3-slopes, and then approaches a fraction of horizontal kinetic energy. The ratio of vertical kinetic energy to potential energy increases quadratic with wavenumber at large scales. It exceeds unity at small scales in stratified turbulence. Global and regional simulations and two recent aircraft measurement field campaigns support these relationships within 30% deviations. Energy exchange between horizontal and vertical motions may contribute to slope changes in the spectra. The model allows for checking measurement validity. Isotropy at large and small scales varies between the datasets. The fraction of divergent energy is 40 to 70% in the measurements, with higher values in the stratosphere. Spectra above the tropopause are often steeper over mountains than over oceans, partly with two -5/3-subranges. 80% of w-variance near the tropopause occurs at scales between about 0.5 and 80 km.

elib-URL des Eintrags:https://elib.dlr.de/129252/
Dokumentart:Zeitschriftenbeitrag
Titel:The horizontal spectrum of vertical velocities near the tropopause from global to gravity-wave scales
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schumann, UlrichDLR, IPAhttps://orcid.org/0000-0001-5255-6869NICHT SPEZIFIZIERT
Datum:2019
Erschienen in:Journal of the Atmospheric Sciences
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1175/JAS-D-19-0160.1
Seitenbereich:Seiten 3847-3862
Verlag:American Meteorological Society
ISSN:0022-4928
Status:veröffentlicht
Stichwörter:atmospheric dynamics, Kinetic energy spectrum, vertical velocity, mesoscale, divergence, measurements, model, DEEPWAVE, NAWDEX
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Luftverkehrsmanagement und Flugbetrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Air Traffic Management and Operation
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre
Hinterlegt von: Schumann, Prof.Dr.habil. Ulrich
Hinterlegt am:23 Sep 2019 08:09
Letzte Änderung:30 Okt 2023 14:27

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