Reverse ray tracing of the mesospheric gravity waves observed at 23°S (Brazil) and 7°S (Indonesia) in airglow imagers

Wrasse, C. M.; Nakamura, Takuji; Tsuda, Toshitaka; Takahashi, H.; Medeiros, A. F.; Taylor, Michael J.; Gobbi, D.; Salatun, A.; Suratno, Suratno; Achmad, E.; Admiranto, A. G.

doi:10.1016/j.jastp.2005.10.012

Cited by 45 publications

(50 citation statements)

References 41 publications

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“…The phase speeds obtained in the present study were slightly greater than those at midlatitudes. Similar gravity waves with large phase speeds (∼70 ms −1 ) were reported in the statistics at equatorial latitudes (e.g., Nakamura et al, 2003;Wrasse et al, 2006).…”

Section: Methods Of Analysissupporting

confidence: 78%

Characteristics of equatorial gravity waves derived from mesospheric airglow imaging observations

et al. 2009

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Abstract. We present the characteristics of small-scale (<100 km) gravity waves in the equatorial mesopause region derived from OH airglow imaging observations at Kototabang (100.3 • E, 0.2 • S), Indonesia, from 2002 to 2005. We adopted a method that could automatically detect gravity waves in the airglow images using two-dimensional cross power spectra of gravity waves. The propagation directions of the waves were likely controlled by zonal filtering due to stratospheric mean winds that show a quasi-biennial oscillation (QBO) and the presence of many wave sources in the troposphere.

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Section: Methods Of Analysissupporting

confidence: 78%

Characteristics of equatorial gravity waves derived from mesospheric airglow imaging observations

et al. 2009

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“…On the other hand, at the midlatitudes in the southern hemisphere and equatorial regions, the preferential directions of wave propagation are mostly in good agreement with the relative locations of convection systems and the ducting structure at the MLT height rather than the wind filtering Walterscheid et al, 1999;Suzuki et al, 2004;Wrasse et al, 2006].…”

Section: Introductionmentioning

confidence: 58%

“…[21] At the middle and low latitudes, several studies reported gravity waves generated by tropospheric convection near the observation sites [e.g., Nakamura et al, 2003;Suzuki et al, 2007;Wrasse et al, 2006;Taylor and Hapgood, 1988]. Figure 8 shows the averaged horizontal distributions of vertical pressure velocity (Omega) and geopotential height at two heights of 100 and 200 hPa from the NCEP Reanalysis data.…”

Section: Discussionmentioning

confidence: 99%

Statistical characteristics of polar cap mesospheric gravity waves observed by an all‐sky airglow imager at Resolute Bay, Canada

et al. 2009

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[1] An airglow imager at Resolute Bay, Canada (74.7°N, 265.1°E) has been used for the observation of gravity waves in the polar cap mesosphere since January 2005. On the basis of the long-term imaging observations obtained over 137 nights during the winter seasons of 2005 and 2006, we extracted 143 events of small-scale (<100 km) gravity waves from sequential sodium airglow (589.3 nm) images. The observed waves typically had horizontal wavelengths of 20-50 km and phase speeds of 30-60 ms À1 . The propagation directions were predominantly westward. We also identified larger-scale (>100 km) gravity waves using airglow keograms, which represent a time series of the horizontal cross sections of the airglow images. The horizontal wavelengths and phase speeds of the large-scale waves were typically 100-400 km and 60-100 ms À1 , respectively. The propagation directions of these large-scale waves also showed a westward preference. The wave parameters appeared to have no relation with the geomagnetic activities represented by the K p index. On the other hand, the propagation directions of the observed waves were consistent with the prevailing eastward winds in the mesosphere and the updraft associated with a low-pressure area that generally appears to the east of Resolute Bay at tropospheric altitudes. These results suggest that the main source of the gravity waves in the polar cap mesosphere is tropospheric dynamics rather than auroral activities.

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“…OLR anomalies at 120 E are shown in red line at 10 N and 5 S for Tirunelveli and Jakarta, respectively (Gurubaran et al 2005). sphere is not significant . The vertical propagation of such gravity waves observed in the MLT region was studied by using a reverse ray-tracing technique and the difference between propagation in the tropics and at mid-latitudes was discussed in detail ( Wrasse et al 2005). Three-dimensional numerical simulations were conducted by using a vertically extended mesoscale meteorological model, and breaking of convection-induced gravity waves and airglow modulation induced by the breaking in the upper mesosphere were revealed (Horinouchi et al 2002).…”

Section: Cumulus Convection Over Sumatramentioning

confidence: 99%

Coupling Processes in the Equatorial Atmosphere (CPEA): A Project Overview

Fukao

2006

Journal of the Meteorological Society of Japan

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The global-scale atmospheric motions are originally generated by the strongest convective motions in the equatorial region caused by absorption of strong solar radiations. Specifically, the western Pacific region called the Indonesian Archipelago is known for its convections, which are the most active and the highest all over the globe due to its warmest ocean water. Therefore, through these global-scale motions, the atmospheric dynamics over the Indonesian equator result in the most significant influences to global atmospheric changes. The mechanisms of these atmospheric changes and fluctuations, however, have not yet been made clear due to the sparseness of observational data in that region. The Coupling Processes in the Equatorial Atmosphere (CPEA) is a six-year research project of Japan to study dynamical and electrodynamical coupling processes in the equatorial atmosphere by conducting various observations in the Indonesian equatorial region. In the present paper we describe the outline of this project and show preliminary results from its first campaign conducted from March to May 2004.

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Reverse ray tracing of the mesospheric gravity waves observed at 23°S (Brazil) and 7°S (Indonesia) in airglow imagers

Cited by 45 publications

References 41 publications

Characteristics of equatorial gravity waves derived from mesospheric airglow imaging observations

Characteristics of equatorial gravity waves derived from mesospheric airglow imaging observations

Statistical characteristics of polar cap mesospheric gravity waves observed by an all‐sky airglow imager at Resolute Bay, Canada

Coupling Processes in the Equatorial Atmosphere (CPEA): A Project Overview

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