DOI: 10.1002/2013JD020147
论文题名: The seasonal cycle of planetary boundary layer depth determined using COSMIC radio occultation data
作者: Chan K.M. ; Wood R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12422
结束页码: 12434
语种: 英语
英文关键词: boundary layer depth
; global
; seasonal
Scopus关键词: Atmospheric thermodynamics
; Cosmology
; Ionosphere
; Radio
; Refraction
; Boundary layer depth
; global
; GPS radio occultations
; High vertical resolution
; Intertropical convergence zone
; Planetary boundary layers
; seasonal
; Subtropical latitudes
; Tropics
; algorithm
; boundary layer
; COSMIC
; data set
; GPS
; heating
; Intergovernmental Panel on Climate Change
; Northern Hemisphere
; planetary atmosphere
; polar region
; radiosonde
; refraction
; seasonal variation
; vertical profile
; Arctic and Antarctic
英文摘要: The seasonal cycle of planetary boundary layer (PBL) depth is examined globally using observations from the Constellation Observing System for the Meteorology, Ionosphere, and Climate (COSMIC) satellite mission. COSMIC uses GPS radio occultation to derive the vertical profile of refractivity at high vertical resolution (∼100 m). Here, we apply an algorithm to determine PBL top height and thus PBL depth from the maximum vertical gradient of refractivity. PBL top detection is sensitive to hydrolapses at nonpolar latitudes but to both hydrolapses and temperature jumps in polar regions. The PBL depths and their seasonal cycles compare favorably with selected radiosonde-derived estimates at tropical, midlatitude, and Antarctic sites, adding confidence that COSMIC can effectively provide estimates of seasonal cycles globally. PBL depth over extratropical land regions peaks during summer consistent with weak static stability and strong surface sensible heating. The subtropics and tropics exhibit a markedly different cycle that largely follows the seasonal march of the Intertropical Convergence Zone with the deepest PBLs associated with dry phases, again suggestive that surface sensible heating deepens the PBL and that wet periods exhibit shallower PBLs. Marine PBL depth has a somewhat similar seasonal march to that over continents but is weaker in amplitude and is shifted poleward. The maximum seasonal amplitude over oceans occurs over the Arctic. Over subtropical/tropical oceans there is seasonal asymmetry about the equator, with winter maxima in the Northern Hemisphere but fall maxima in the south. The seasonal march of PBL depth is largely modulated by the seasonal cycle of static stability in the extratropics and by the monsoon circulations at tropical and subtropical latitudes. Key Points Seasonal cycle of PBL depth is investigated globally using GPS radio occultation Seasonal cycle of PBL depth is strongest over extratropical land areas Seasonal cycle in subtropics/tropics is associated with movement of ITCZ ©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/63153
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: Department of Atmospheric Science, University of Washington, Seattle, WA 98195, United States
Recommended Citation:
Chan K.M.,Wood R.. The seasonal cycle of planetary boundary layer depth determined using COSMIC radio occultation data[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)