On the role of dust storms in triggering atmospheric gravity waves observed in the middle atmosphere

Das, S.; Taori, A.; Jayaraman, A.

doi:10.5194/angeo-29-1647-2011

Cited by 8 publications

(9 citation statements)

References 24 publications

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“…Based on satellite observations in the Thar Desert, India, Das et al . [] showed that lower atmospheric heating caused by dust storms can trigger gravity waves in the middle atmosphere.…”

Section: Convective and Orographic Hotspotsmentioning

confidence: 99%

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A global view of stratospheric gravity wave hotspots located with Atmospheric Infrared Sounder observations

2013

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[1] The main aim of this study is to find and classify hotspots of stratospheric gravity waves on a global scale. The analysis is based on a 9 year record (2003 to 2011) of radiance measurements by the Atmospheric Infrared Sounder (AIRS) aboard NASA's Aqua satellite. We detect gravity waves based on 4.3 mm brightness temperature variances. Our method focuses on peak events, i.e., strong gravity wave events for which the local variance considerably exceeds background levels. We estimate the occurrence frequencies of these peak events for different seasons and time of day and use the results to find local maxima or "hotspots." In addition, we use AIRS radiances at 8.1 mm to simultaneously detect convective events, including deep convection in the tropics and mesoscale convective systems at middle latitudes. We classify the gravity wave sources based on seasonal occurrence frequencies for convection, but also by means of time series analyses and topographic data. Our study reproduces well-known hotspots of gravity waves, e.g., the Andes and the Antarctic Peninsula. However, the high horizontal resolution of the AIRS observations also allows us to locate numerous mesoscale hotspots, which are partly unknown or poorly studied so far. Most of these mesoscale hotspots are found near orographic features like mountain ranges, coasts, lakes, deserts, or isolated islands. This study will help to select promising regions and seasons for future case studies of gravity waves.Citation: Hoffmann, L., X. Xue, and M. J. Alexander (2013), A global view of stratospheric gravity wave hotspots located with Atmospheric Infrared Sounder observations,

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“…Based on satellite observations in the Thar Desert, India, Das et al . [] showed that lower atmospheric heating caused by dust storms can trigger gravity waves in the middle atmosphere.…”

Section: Convective and Orographic Hotspotsmentioning

confidence: 99%

“…Additional hotspots are found over the Musandam Peninsula, Persian Gulf (index 40 and 80), near Kuwait (index 85), and near Gujarat, India (index 39). Based on satellite observations in the Thar Desert, India, Das et al [2011] showed that lower atmospheric heating caused by dust storms can trigger gravity waves in the middle atmosphere.…”

Section: Asiamentioning

confidence: 99%

A global view of stratospheric gravity wave hotspots located with Atmospheric Infrared Sounder observations

2013

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“…However, it is to be noted that their observations were from a tropical semiarid location in India. In addition to that, sporadic events like dust storms can transport aerosol particles from western arid regions and they become a source for triggering the gravity waves in the middle atmosphere (Das et al, 2011). In this context, the present study from an extra-tropical high-altitude location showed for the first time the dominant long-period 25-45 day oscillations westward (northward), propagating Rossby waves effective in modulating shorter wavelengths (accumulation mode aerosols) in winter and the pre-monsoon season (Dumka et al, 2008) from eastern arid regions observed over our site.…”

Section: Resultsmentioning

confidence: 99%

“…Devara et al, 1994;Panditurai et al, 1998;Pal and Devara, 2012). In this context, a few recent studies have focused on the modulation of spectral aerosol optical depth (AOD) by short-and long-period oscillations (Tian et al, 2008;Beegum et al, 2009;Das et al, 2011;Manoj and Devara, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Considering the advances in the morphology of aerosol layers and their contribution to the Earth's radiation budget, recent reports attempted to understand the role of atmospheric waves in the variability of AOD, from fast-moving gravity waves to slow-moving planetary-scale waves. It is also known that the planetary-scale waves are intense in winter in both hemispheres and play a vital role in transporting not only energy and momentum but also atmospheric trace species (Rossby, 1939;Madden and Julian, 1971;Tian et al, 2008;Beegum et al, 2009;Das et al, 2011;Manoj and Devara, 2011). Hence, it is important to understand the variability of aerosols in terms of atmospheric wave modulations, and this discrepancy could be an essential input to the global and regional aerosol models to assess the global and regional aerosol radiative forcing (ARF) and subsequent climatic impacts (Satheesh et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Signatures of Rossby wave modulations in aerosol optical depth over the central Himalayan region

Phanikumar

Kumar²,

Shukla

et al. 2014

Ann. Geophys.

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Abstract. Long-period modulations are shown in aerosol optical depth measured by the Microtops II Sun photometer over a high-altitude site the central Himalayan region (Nainital, 29.4° N, 79.5° E, 1958 m a.m.s.l.) for the first time. Fourier analysis of aerosol optical depth showed dominant 25–45 day oscillations observed in MODerate-resolution Imaging Spectro radiometer data. Further, a Hovmiller diagram showed westward (northward) propagation at a different longitude (latitude), confirming that the modulations are associated with Rossby waves. It is also shown that the Rossby wave amplitude causes an additional warming of 4.16 ± 0.98 W m−2 over the observational site. Hence, the present study illustrates the importance of wave-induced aerosol dynamics and the corresponding radiative effects.

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Tidal and gravity waves study from the airglow measurements at Kolhapur (India)

et al. 2012

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Simultaneous photometric measurements of the OI 557.7 nm and OH (7, 2) band from a low latitude station, Kolhapur (16.8 • N, 74.2 • E) during the period 2004-2007 are analyzed to study the dominant waves present in the 80-100 km altitude region of the atmosphere. The nocturnal intensity variations of different airglow emissions are observed using scanning temperature controlled filter photometers. Waves having period lying between 2 and 12 hours have been recorded. Some of these waves having subharmonic tidal oscillation periods 4, 6, 8 and 12 hours propagate upward with velocity lying in the range 1.6-11.3 m/s and the vertical wave length lying between 28.6 and 163 kms. The other waves may be the upward propagating gravity waves or waves resulting from the interaction of inter-mode tidal oscillations, interaction of tidal waves with planetary waves and gravity waves. Some times, the second harmonic wave has higher vertical velocity than the corresponding fundamental wave. Application of these waves in studying the thermal structure of the region is discussed.

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On the role of dust storms in triggering atmospheric gravity waves observed in the middle atmosphere

Cited by 8 publications

References 24 publications

A global view of stratospheric gravity wave hotspots located with Atmospheric Infrared Sounder observations

A global view of stratospheric gravity wave hotspots located with Atmospheric Infrared Sounder observations

Signatures of Rossby wave modulations in aerosol optical depth over the central Himalayan region

Tidal and gravity waves study from the airglow measurements at Kolhapur (India)

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