DOI: 10.1002/jgrd.50492
论文题名: Modulation mechanisms of marine atmospheric boundary layer at the Brazil-Malvinas Confluence region
作者: De Camargo R. ; Todesco E. ; Pezzi L.P. ; De Souza R.B.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6266
结束页码: 6280
语种: 英语
英文关键词: boundary layer modulation
; Brazil-Malvinas Confluence region
; western South Atlantic
Scopus关键词: Advection
; Atmospheric temperature
; Coastal zones
; Data processing
; Experiments
; Bottom boundary conditions
; Brazil-Malvinas Confluence
; Correlation coefficient
; Marine atmospheric boundary layer
; Numerical experiments
; Quantitative evaluation
; Sea surface temperature (SST)
; South Atlantic
; Modulation
; advection
; atmospheric modeling
; boundary condition
; boundary layer
; confluence
; Coriolis force
; data assimilation
; error analysis
; experimental study
; heat transfer
; hydrostatics
; marine ecosystem
; quantitative analysis
; wind field
; Atlantic Ocean
; Brazil-Malvinas Confluence
英文摘要: The influence of the Brazil-Malvinas Confluence (BMC) region on the marine atmospheric boundary layer (MABL) is investigated through in situ data analysis of five different cruises (2004 to 2008) and numerical experiments with a regional atmospheric model. Two different groups of numerical experiments were performed in order to evaluate the relevance of static stability and hydrostatic balance physical mechanisms for the MABL instability. The first group used monthly climatological sea surface temperature (SST) as bottom boundary condition while the second used daily updated Advanced Microwave Scanning Radiometer-EOS SST data together with radiosondes and surface data assimilation. A reasonable agreement between numerical results and QuikSCAT wind data was observed through correlation coefficients and mean square error values. In terms of the horizontal structure of the MABL, stronger winds were found over the warm side of the BMC region as well as over the thermal front itself, which supports the coexistence of both modulation mechanisms. The analyzed patterns of surface atmospheric thermal advection showed a clear interaction between the synoptic and regional scales. The signature of the oceanic thermal front (almost meridionally oriented) on the air temperature at 2 m makes the temperature advection strongly determined by the zonal component of the wind. The analysis of momentum budget terms did not show a clear and reasonable explanation of the existence or predominance of the modulation mechanisms, and it also suggested the relevance of other effects, such as the idea based on unbalanced Coriolis force and turbulence/friction effects. Key Points joint observational and numerical analyses regional atmospheric modeling with in situ data assimilation quantitative evaluation of modulation mechanisms © 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/63648
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 Sciences, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Rua de Matão 1226, Sao Paulo 05508-090, Brazil; Earth Observation General Coordination, National Institute for Space Research, Sao Jose dos Campos, Brazil; South Regional Center for Space Research, National Institute for Space Research, Santa Maria, Brazil
Recommended Citation:
De Camargo R.,Todesco E.,Pezzi L.P.,et al. Modulation mechanisms of marine atmospheric boundary layer at the Brazil-Malvinas Confluence region[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)