Coastally trapped atmospheric gravity waves on SAR, AVHRR and MODIS images

Gan, Xilin; Huang, Weigen; Li, Xiaofeng; Chen, X. J.; Lou, Xiulin; Zhao, Zhongxiang; Yang, Jingsong; Shi, Aiqin

doi:10.1080/01431160701395260

Cited by 16 publications

(11 citation statements)

References 10 publications

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“…The larger one represents a rapidly propagating frontal wave, and it dose not agree with the wave packet in the SAR image. This situation is similar to that of a coastal lee wave (Gan et al, 2008).…”

Section: Comparison With Observations and Dynamic Features Of Model Wmentioning

confidence: 61%

Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea

et al. 2010

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In the satellite synthetic aperture radar (SAR) images of the Bohai Sea and Huanghai Sea, the authors observe sea surface imprints of wave-like patterns with an average wavelength of 3.8 km. Comparing SAR observations with sea surface wind fields and surface weather maps, the authors find that the occurrence of the wave-like phenomena is associated with the passing of atmospheric front. The authors define the waves as atmospheric frontal gravity waves. The dynamical parameters of the wave packets are derived from statistics of 9 satellite SAR images obtained from 2002 to 2008. A two-dimensional linear physical wave model is used to analyze the generation mechanism of the waves. The atmospheric frontal wave induced wind variation across the frontal wave packet is compared with wind retrievals from the SAR images. The CMOD-5 (C-band scatterometer ocean geophysical model function) is used for SAR wind retrievals VV (transmitted vertical and received vertical) for ENVISAT and HH (transmitted horizontally and received horizontally) for RADARSAT-1. A reasonable agreement between the analytical solution and the SAR observation is reached. This new SAR frontal wave observation adds to the school of SAR observations of sea surface imprints of AGWs including island lee waves, coastal lee waves, and upstream Atmospheric Gravity Waves (AGW).

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Section: Comparison With Observations and Dynamic Features Of Model Wmentioning

confidence: 61%

Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea

et al. 2010

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“…2b) the estimated intrinsic average phase speed is 11.1 m s −1 . The characteristics of these waves make them comparable to the Australian Morning Glories (Smith, 1988;Christie, 1989;Rottman and Grimshaw, 2002), and to the AGWs in the Korean Peninsula (Gan et al, 2008) and in the Mozambique Channel (da .…”

Section: Agw Case Studies In the Red Seamentioning

confidence: 99%

“…Despite these different imaging mechanisms, in some cases discrimination between oceanic and atmospheric signatures in satellite imagery is difficult or even impossible and ambiguities often arise such as those exemplified by the discussions following the work of Kim et al (2005a) (Zheng, 2005;Kim et al, 2005b;Gan et al, 2008). The global IW survey undertaken by Jackson (2007) (using MODIS imagery), showed that oceanic IWs are present in the Red Sea region (Fig.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric gravity waves in the Red Sea: a new hotspot

Magalhaes

Araujo²,

Silva

et al. 2011

Nonlin. Processes Geophys.

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Abstract. The region of the Middle East around the Red Sea (between 32 • E and 44 • E longitude and 12 • N and 28 • N latitude) is a currently undocumented hotspot for atmospheric gravity waves (AGWs). Satellite imagery shows evidence that this region is prone to relatively high occurrence of AGWs compared to other areas in the world, and reveals the spatial characteristics of these waves. The favorable conditions for wave propagation in this region are illustrated with three typical cases of AGWs propagating in the lower troposphere over the sea. Using weakly nonlinear long wave theory and the observed characteristic wavelengths we obtain phase speeds which are consistent with those observed and typical for AGWs, with the Korteweg-de Vries theory performing slightly better than Benjamin-Davis-Acrivos-Ono theory as far as phase speeds are concerned. ERS-SAR and Envisat-ASAR satellite data analysis between 1993 and 2008 reveals signatures consistent with horizontally propagating large-scale internal waves. These signatures cover the entire Red Sea and are more frequently observed between April and September, although they also occur during the rest of the year. The region's (seasonal) propagation conditions for AGWs, based upon average vertical atmospheric stratification profiles suggest that many of the signatures identified in the satellite images are atmospheric internal waves.

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“…The wave pattern of AGW packets starts with a narrow bright band in front followed by a narrow dark band. European ERS-1/2, Envisat and Canadian Radarsat SARs have been used to observe AGWs in the coastal oceans [4][5][6]. Wavelengths and propogation directions of AGWs have been derived from SAR images.…”

Section: Introductionmentioning

confidence: 99%