A theoretical model analysis of the sudden narrow temperature-layer formation observed in the ALOHA-93 Campaign

H. Hur, Tai-yin Huang, Z. Zhao, Prasanna Karunanayaka, T. F. Tuan

Research output: Contribution to journalReview article

3 Citations (Scopus)

Abstract

The behavior of temperature and wind profiles observed on 21 October 1993 in the ALOHA-93 Campaign is theoretically and numerically analyzed. A sudden temperature rise took place in a very narrow vertical region (3-4 km) at about 87 km. Simultaneously observed radar wind profiles and mesospheric airglow wave structures that show a horizontal phase speed of 35 m/s and a period of about half an hour strongly suggest that a critical level may occur in the proximity of that altitude and that the energy dissipation due to the interaction of the gravity wave with the critical level causes the temperature rise. The numerical model used is a solution to the gravity wave - mean-flow interaction in the critical layer, including a simple cooling mechanism and a wave-energy dissipation simulated by the "optical model* technique. The solutions for the temperature variations so obtained show good agreement with the observed temperature profiles at different times, providing a quantitative explanation for the temperature inversion layer as a phenomenon of gravity wave - critical layer interaction.

Original languageEnglish (US)
Pages (from-to)1543-1558
Number of pages16
JournalCanadian Journal of Physics
Volume80
Issue number12
DOIs
StatePublished - Dec 1 2002

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gravity waves
wind profiles
temperature profiles
energy dissipation
temperature inversions
airglow
interactions
temperature
radar
proximity
cooling
causes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "A theoretical model analysis of the sudden narrow temperature-layer formation observed in the ALOHA-93 Campaign",
abstract = "The behavior of temperature and wind profiles observed on 21 October 1993 in the ALOHA-93 Campaign is theoretically and numerically analyzed. A sudden temperature rise took place in a very narrow vertical region (3-4 km) at about 87 km. Simultaneously observed radar wind profiles and mesospheric airglow wave structures that show a horizontal phase speed of 35 m/s and a period of about half an hour strongly suggest that a critical level may occur in the proximity of that altitude and that the energy dissipation due to the interaction of the gravity wave with the critical level causes the temperature rise. The numerical model used is a solution to the gravity wave - mean-flow interaction in the critical layer, including a simple cooling mechanism and a wave-energy dissipation simulated by the {"}optical model* technique. The solutions for the temperature variations so obtained show good agreement with the observed temperature profiles at different times, providing a quantitative explanation for the temperature inversion layer as a phenomenon of gravity wave - critical layer interaction.",
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A theoretical model analysis of the sudden narrow temperature-layer formation observed in the ALOHA-93 Campaign. / Hur, H.; Huang, Tai-yin; Zhao, Z.; Karunanayaka, Prasanna; Tuan, T. F.

In: Canadian Journal of Physics, Vol. 80, No. 12, 01.12.2002, p. 1543-1558.

Research output: Contribution to journalReview article

TY - JOUR

T1 - A theoretical model analysis of the sudden narrow temperature-layer formation observed in the ALOHA-93 Campaign

AU - Hur, H.

AU - Huang, Tai-yin

AU - Zhao, Z.

AU - Karunanayaka, Prasanna

AU - Tuan, T. F.

PY - 2002/12/1

Y1 - 2002/12/1

N2 - The behavior of temperature and wind profiles observed on 21 October 1993 in the ALOHA-93 Campaign is theoretically and numerically analyzed. A sudden temperature rise took place in a very narrow vertical region (3-4 km) at about 87 km. Simultaneously observed radar wind profiles and mesospheric airglow wave structures that show a horizontal phase speed of 35 m/s and a period of about half an hour strongly suggest that a critical level may occur in the proximity of that altitude and that the energy dissipation due to the interaction of the gravity wave with the critical level causes the temperature rise. The numerical model used is a solution to the gravity wave - mean-flow interaction in the critical layer, including a simple cooling mechanism and a wave-energy dissipation simulated by the "optical model* technique. The solutions for the temperature variations so obtained show good agreement with the observed temperature profiles at different times, providing a quantitative explanation for the temperature inversion layer as a phenomenon of gravity wave - critical layer interaction.

AB - The behavior of temperature and wind profiles observed on 21 October 1993 in the ALOHA-93 Campaign is theoretically and numerically analyzed. A sudden temperature rise took place in a very narrow vertical region (3-4 km) at about 87 km. Simultaneously observed radar wind profiles and mesospheric airglow wave structures that show a horizontal phase speed of 35 m/s and a period of about half an hour strongly suggest that a critical level may occur in the proximity of that altitude and that the energy dissipation due to the interaction of the gravity wave with the critical level causes the temperature rise. The numerical model used is a solution to the gravity wave - mean-flow interaction in the critical layer, including a simple cooling mechanism and a wave-energy dissipation simulated by the "optical model* technique. The solutions for the temperature variations so obtained show good agreement with the observed temperature profiles at different times, providing a quantitative explanation for the temperature inversion layer as a phenomenon of gravity wave - critical layer interaction.

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