DOI: 10.1002/2013JD020122
论文题名: Quantifying the role of orographic gravity waves on polar stratospheric cloud occurrence in the Antarctic and the Arctic
作者: Alexander S.P. ; Klekociuk A.R. ; McDonald A.J. ; Pitts M.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 20 起始页码: 11493
结束页码: 11507
语种: 英语
英文关键词: gravity waves
; polar stratospheric clouds
Scopus关键词: Gravity waves
; Landforms
; Wind
; Mountain regions
; Orographic gravity waves
; Particle movement
; Polar stratospheric clouds
; Stratospheric temperature
; Trajectory modeling
; Tropospheric winds
; Wave generation and propagation
; Ice
; atmospheric forcing
; gravity wave
; mountain region
; orographic effect
; polar region
; polar stratospheric cloud
; satellite imagery
; synoptic meteorology
; troposphere
; winter
; Antarctica
英文摘要: The proportion of polar stratospheric clouds due to orographic gravity wave (OGW) forcing is quantified during four Antarctic (2007-2010) and four Arctic (2006/2007 to 2009/2010) winter seasons. OGW-active days are defined as those days above major polar mountain ranges which have wave-ice polar stratospheric clouds (PSCs), tropospheric wind conditions appropriate for orographic wave generation and propagation, and stratospheric temperatures below the frost point: 37% of Antarctic days and 12% of Arctic days are OGW-active. Regions downstream of these mountain ranges are defined using a forward-trajectory model which follows particle movement from ridge lines for 24 h periods. In both hemispheres in these mountain regions, more than 75% of H2 O ice PSCs and around 50% of a high number density liquid-nitric acid trihydrate mixture class (Mix 2-enh) are attributed to OGW activity, with the balances due to non-orographic formation. For the whole Arctic (equatorward of 82°), 25% of Mix 2-enh and 54% of H2 O ice PSCs are attributed to OGWs, while for the whole Antarctic, 7% of Mix 2-enh and 13% of H2 O ice PSCs are attributed to OGWs. For all types of PSC, 5% in the whole Antarctic and 12% in the whole Arctic are attributed to OGW forcing. While gravity waves play a role in PSC formation in the Antarctic, overall it is minor compared with other forcing sources. However, in the synoptically warmer Arctic, much larger proportions of PSCs are due to OGW activity. Key Points PSCs due to OGWs using satellite and trajectory model data Role of OGW in formation of PSCs more important in warmer Arctic The polar-cap total PSCs due to OGW activity is lower in the Antarctic ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63213
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: Australian Antarctic Division, 203 Channel Highway, Kingston, TAS 7050, Australia; Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand; NASA Langley Research Center, Hampton VA, United States
Recommended Citation:
Alexander S.P.,Klekociuk A.R.,McDonald A.J.,et al. Quantifying the role of orographic gravity waves on polar stratospheric cloud occurrence in the Antarctic and the Arctic[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(20)