Nonlinear modulation of O3 and CO induced by mountain waves in the upper troposphere and lower stratosphere during terrain-induced rotor experiment

Mohamed Moustaoui, Alex Mahalov, H. Teitelbaum, V. Grubišić

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6 Citations (Scopus)

Abstract

We analyze and explain distributions of trace gases (O3, CO) and potential temperature observed in aircraft measurements in the upper troposphere and lower stratosphere during the terrain-induced rotor experiment. These distributions show fluctuations induced by mountain waves, with phases and amplitudes that are modulated and correlations that reverse sign along legs of the aircraft at constant altitudes. It is demonstrated that the observed correlations and distributions of gas traces can be explained by reversible processes induced by interactions between mountain waves with different wavelengths evolving on top of a mean vertical profile of ozone that is perturbed by synoptic scale motion. A wave with a large wavelength displaces the air column, causing horizontal variations in the vertical mean gradients. The short waves evolving in these modulated gradients induce wave signatures in O3 and CO, with amplitudes and phase relationships that depend on the vertical gradients encountered along the path of the aircraft. The proposed explanation is confirmed by reconstructed tracer variations deduced under this dynamical process. This is further supported by nonlinear analytical calculations that use background mean profiles from the observations, where the tracer variations induced by mutual wave-wave interaction are investigated.

Original languageEnglish (US)
Article numberD19103
JournalJournal of Geophysical Research: Atmospheres
Volume115
Issue number19
DOIs
StatePublished - 2010

Fingerprint

Upper atmosphere
Troposphere
Carbon Monoxide
stratosphere
troposphere
mountains
rotors
Rotors
Modulation
modulation
mountain
aircraft
trace gas
experiment
Experiments
Aircraft
gradients
tracer
tracers
wave-wave interaction

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

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title = "Nonlinear modulation of O3 and CO induced by mountain waves in the upper troposphere and lower stratosphere during terrain-induced rotor experiment",
abstract = "We analyze and explain distributions of trace gases (O3, CO) and potential temperature observed in aircraft measurements in the upper troposphere and lower stratosphere during the terrain-induced rotor experiment. These distributions show fluctuations induced by mountain waves, with phases and amplitudes that are modulated and correlations that reverse sign along legs of the aircraft at constant altitudes. It is demonstrated that the observed correlations and distributions of gas traces can be explained by reversible processes induced by interactions between mountain waves with different wavelengths evolving on top of a mean vertical profile of ozone that is perturbed by synoptic scale motion. A wave with a large wavelength displaces the air column, causing horizontal variations in the vertical mean gradients. The short waves evolving in these modulated gradients induce wave signatures in O3 and CO, with amplitudes and phase relationships that depend on the vertical gradients encountered along the path of the aircraft. The proposed explanation is confirmed by reconstructed tracer variations deduced under this dynamical process. This is further supported by nonlinear analytical calculations that use background mean profiles from the observations, where the tracer variations induced by mutual wave-wave interaction are investigated.",
author = "Mohamed Moustaoui and Alex Mahalov and H. Teitelbaum and V. Grubišić",
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journal = "Journal of Geophysical Research: Atmospheres",
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T1 - Nonlinear modulation of O3 and CO induced by mountain waves in the upper troposphere and lower stratosphere during terrain-induced rotor experiment

AU - Moustaoui, Mohamed

AU - Mahalov, Alex

AU - Teitelbaum, H.

AU - Grubišić, V.

PY - 2010

Y1 - 2010

N2 - We analyze and explain distributions of trace gases (O3, CO) and potential temperature observed in aircraft measurements in the upper troposphere and lower stratosphere during the terrain-induced rotor experiment. These distributions show fluctuations induced by mountain waves, with phases and amplitudes that are modulated and correlations that reverse sign along legs of the aircraft at constant altitudes. It is demonstrated that the observed correlations and distributions of gas traces can be explained by reversible processes induced by interactions between mountain waves with different wavelengths evolving on top of a mean vertical profile of ozone that is perturbed by synoptic scale motion. A wave with a large wavelength displaces the air column, causing horizontal variations in the vertical mean gradients. The short waves evolving in these modulated gradients induce wave signatures in O3 and CO, with amplitudes and phase relationships that depend on the vertical gradients encountered along the path of the aircraft. The proposed explanation is confirmed by reconstructed tracer variations deduced under this dynamical process. This is further supported by nonlinear analytical calculations that use background mean profiles from the observations, where the tracer variations induced by mutual wave-wave interaction are investigated.

AB - We analyze and explain distributions of trace gases (O3, CO) and potential temperature observed in aircraft measurements in the upper troposphere and lower stratosphere during the terrain-induced rotor experiment. These distributions show fluctuations induced by mountain waves, with phases and amplitudes that are modulated and correlations that reverse sign along legs of the aircraft at constant altitudes. It is demonstrated that the observed correlations and distributions of gas traces can be explained by reversible processes induced by interactions between mountain waves with different wavelengths evolving on top of a mean vertical profile of ozone that is perturbed by synoptic scale motion. A wave with a large wavelength displaces the air column, causing horizontal variations in the vertical mean gradients. The short waves evolving in these modulated gradients induce wave signatures in O3 and CO, with amplitudes and phase relationships that depend on the vertical gradients encountered along the path of the aircraft. The proposed explanation is confirmed by reconstructed tracer variations deduced under this dynamical process. This is further supported by nonlinear analytical calculations that use background mean profiles from the observations, where the tracer variations induced by mutual wave-wave interaction are investigated.

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