Gravity-wave-induced cross-isentropic mixing: a DEEPWAVE case study

Publikationstyp:
Zeitschriftenaufsatz
Metadaten:
Autoren
  • Hans-Christoph Lachnitt
  • Peter Hoor
  • Daniel Kunkel
  • Martina Bramberger
  • Andreas Doernbrack
  • Stefan Mueller
  • Philipp Reutter
  • Andreas Giez
  • Thorsten Kaluza
  • Markus Rapp
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000911430500001&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/acp-23-355-2023
eISSN
1680-7324
Externe Identifier
  • Clarivate Analytics Document Solution ID: 7T4QV
ISSN
1680-7316
Ausgabe der Veröffentlichung
1
Zeitschrift
ATMOSPHERIC CHEMISTRY AND PHYSICS
Paginierung
355 - 373
Datum der Veröffentlichung
2023
Status
Published
Titel
Gravity-wave-induced cross-isentropic mixing: a DEEPWAVE case study
Sub types
  • Article
Ausgabe der Zeitschrift
23

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. Orographic gravity waves (i.e., mountain waves) can potentially lead to cross-isentropic fluxes of trace gases via the generation of turbulence. During the DEEPWAVE (Deep Propagating Gravity Wave Experiment) campaign in July 2014, we performed tracer measurements of carbon monoxide (CO) and nitrous oxide (N2O) above the Southern Alps during periods of gravity wave activity. The measurements were taken along two stacked levels at 7.9 km in the troposphere and 10.9 km in the stratosphere. A detailed analysis of the observed wind components shows that both flight legs were affected by vertically propagating gravity waves with momentum deposition and energy dissipation between the two legs. Corresponding tracer measurements indicate turbulent mixing in the region of gravity wave occurrence. For the stratospheric data, we identified mixing leading to a change of the cross-isentropic tracer gradient of N2O from the upstream to the downstream region of the Southern Alps. Based on the quasi-inert tracer N2O, we identified two distinct layers in the stratosphere with different chemical composition on different isentropes as given by constant potential temperature Θ. The CO–N2O relationship clearly indicates that irreversible mixing between these two layers occurred. Further, we found a significant change of the vertical profiles of N2O with respect to Θ from the upstream to the downstream side above the Southern Alps just above the tropopause. A scale-dependent gradient analysis reveals that this cross-isentropic gradient change of N2O is triggered in the region of gravity wave occurrence. The power spectra of the in situ measured vertical wind, Θ, and N2O indicate the occurrence of turbulence above the mountains associated with the gravity waves in the stratosphere. The estimated eddy dissipation rate (EDR) based on the measured three-dimensional wind indicates a weak intensity of turbulence in the stratosphere above the mountain ridge. The Θ–N2O relation downwind of the Alps modified by the gravity wave activity provides clear evidence that trace gas fluxes, which were deduced from wavelet co-spectra of vertical wind and N2O, are at least in part cross-isentropic. Our findings thus indicate that orographic waves led to turbulent mixing on both flight legs in the troposphere and in the stratosphere. Despite only weak turbulence during the stratospheric leg, the cross-isentropic gradient and the related composition change on isentropic surfaces from upstream to downstream of the mountain unambiguously conserves the effect of turbulent mixing by gravity wave activity on the trace gas distribution prior to the measurements. This finally leads to irreversible trace gas fluxes across isentropes and thus has a persistent effect on the upper troposphere and lower stratosphere (UTLS) trace gas composition. </jats:p>
Autoren
  • Hans-Christoph Lachnitt
  • Peter Hoor
  • Daniel Kunkel
  • Martina Bramberger
  • Andreas Dörnbrack
  • Stefan Müller
  • Philipp Reutter
  • Andreas Giez
  • Thorsten Kaluza
  • Markus Rapp
DOI
10.5194/acp-23-355-2023
eISSN
1680-7324
Ausgabe der Veröffentlichung
1
Zeitschrift
Atmospheric Chemistry and Physics
Sprache
en
Online publication date
2023
Paginierung
355 - 373
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/acp-23-355-2023
Datum der Datenerfassung
2023
Titel
Gravity-wave-induced cross-isentropic mixing: a DEEPWAVE case study
Ausgabe der Zeitschrift
23

Datenquelle: Crossref

Author's licence
CC-BY
Autoren
  • Hans-Christoph Lachnitt
  • Peter Hoor
  • Daniel Kunkel
  • Martina Bramberger
  • Andreas Dörnbrack
  • Stefan Müller
  • Philipp Reutter
  • Andreas Geiz
  • Thorsten Kaluza
  • Markus Rapp
Hosting institution
Universitätsbibliothek Mainz
Sammlungen
  • DFG-491381577-G
Resource version
Published version
DOI
10.5194/acp-23-355-2023
File(s) embargoed
false
Open access
true
ISSN
1680-7324
Ausgabe der Veröffentlichung
1
Zeitschrift
Atmospheric Chemistry and Physics
Schlüsselwörter
  • 530 Physik
  • 530 Physics
Sprache
eng
Open access status
Open Access
Paginierung
355 - 373
Datum der Veröffentlichung
2023
Public URL
https://openscience.ub.uni-mainz.de/handle/20.500.12030/8950
Herausgeber
Copernicus GmbH EGU
Datum der Datenerfassung
2023
Datum, an dem der Datensatz öffentlich gemacht wurde
2023
Zugang
Public
Titel
Gravity-wave-induced cross-isentropic mixing: a DEEPWAVE case study
Ausgabe der Zeitschrift
23

Files

gravitywaveinduced_crossisent-20230316113501355.pdf

Datenquelle: OPENSCIENCE.UB

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