DOI: 10.1029/2012JD018658
论文题名: A global view of stratospheric gravity wave hotspots located with atmospheric infrared sounder observations
作者: Hoffmann L. ; Xue X. ; Alexander M.J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 416
结束页码: 434
语种: 英语
Scopus关键词: Arid regions
; Gravity waves
; Infrared devices
; NASA
; Sounding apparatus
; Storms
; Time series analysis
; Antarctic Peninsula
; Atmospheric infrared sounders
; Brightness temperatures
; Convective events
; Horizontal resolution
; Isolated islands
; Mesoscale Convective System
; Radiance measurement
; Infrared instruments
; Aqua (satellite)
; brightness temperature
; gravity wave
; hot spot
; infrared imagery
; observational method
; stratosphere
; topography
; Antarctic Peninsula
; Antarctica
; West Antarctica
英文摘要: 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. © 2012. American Geophysical Union. 资助项目: 40804035
; 41174132
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63986
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Forschungszentrum Jülich, Jülich Supercomputing Centre, Wilhelm-Johnen-Strase, 52425 Jülich, Germany; Department of Geophysics and Planetary Sciences, CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui, China; School of Earth and Space Sciences, Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, Anhui, China; NorthWest Research, Inc, Boulder, CO, United States
Recommended Citation:
Hoffmann L.,Xue X.,Alexander M.J.. A global view of stratospheric gravity wave hotspots located with atmospheric infrared sounder observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)