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| Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea | |
| 作者姓名： | LIU Shuming LI Ziwei YANG Xiaofeng Pichel William G YU Yang ZHENG Quanan LI Xiaofeng |
| 作者单位： | The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;National Marine Data and Information Service, Tianjin 300171, China,Institute of Remote Sensing Applications Chinese Academy of Science, Beijing 100101, China,Institute of Remote Sensing Applications Chinese Academy of Science, Beijing 100101, China,NOAA/NESDIS, Center for Satellite Applications and Research, Camp Springs, MD 20746-4304, USA,The First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China,Department of Atmospheric and Oceanic Science, University of Maryland, Maryland 20742-2425, USA,IMSG at NOAA/NESDIS, NOAA E/RA3, WWBG, Room 102, 5200 Auth Road, Camp Springs, MD 20746-4304, USA |
| 基金项目： | 国土资源大调查项目(1212010611402);国家自然科学基金(40642009)。 |
| 摘 要： | 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). |
| 关 键 词： | Atmospheric gravity waves atmospheric front generation mechanism synthetic aperture radar |
| 收稿时间： | 4/6/2010 12:00:00 AM |
| 修稿时间： | 2010/7/30 0:00:00 |
Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea |
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| LIU Shuming,LI Ziwei,YANG Xiaofeng,Pichel William G,YU Yang,ZHENG Quanan,LI Xiaofeng.Atmospheric frontal gravity waves observed in satellite SAR images of the Bohai Sea and Huanghai Sea[J].Acta Oceanologica Sinica,2010,29(5):35-43. | |
| Authors: | LIU Shuming LI Ziwei YANG Xiaofeng Pichel William G YU Yang ZHENG Quanan and LI Xiaofeng |
| Institution: | 1. The First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;National Marine Data and Information Service,Tianjin 300171,China 2. Institute of Remote Sensing Applications Chinese Academy of Science,Beijing 100101,China 3. NOAA/NESDIS,Center for Satellite Applications and Research,Camp Springs,MD 20746-4304,USA 4. The First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China 5. Department of Atmospheric and Oceanic Science,University of Maryland,Maryland 20742-2425,USA 6. IMSG at NOAA/NESDIS,NOAA E/RA3,WWBG,Room 102,5200 Auth Road,Camp Springs,MD 20746-4304,USA. |
| Abstract: | 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). |
| Keywords: | Atmospheric gravity waves atmospheric front generation mechanism synthetic aperture radar |
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