DOI: 10.1016/j.atmosres.2017.12.016
Scopus记录号: 2-s2.0-85044282378
论文题名: Evolution of the Planetary Boundary Layer on the northern coast of Brazil during the CHUVA campaign
作者: Ramos D.N.D.S. ; Fernandez J.P.R. ; Fisch G.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 203 起始页码: 298
结束页码: 310
语种: 英语
英文关键词: Atmospheric stability
; Lapse rate
; Nighttime precipitation
; Tropical planetary boundary layer
; Wind profile
Scopus关键词: Atmospheric thermodynamics
; Boundary layer flow
; Boundary layers
; Weather forecasting
; Atmospheric stability
; Intertropical convergence zone
; Lapse rate
; Meteorological fields
; Numerical weather prediction models
; Planetary boundary layers
; Thermodynamic structures
; Wind profiles
; Atmospheric boundary layer
英文摘要: This study aims to characterize the wind and thermodynamic structure of the Planetary Boundary Layer (PBL) on the northern coast of Brazil (NCB) via the CHUVA datasets. Three synoptic conditions were present in the NCB region between March 1 and 25, 2010: a dry period, the Upper Tropospheric Cyclonic Vortex (UTCV) and the Intertropical Convergence Zone (ITCZ). Nighttime precipitation accounted for 78% of the total precipitation observed in the month, mainly during the ITCZ. In general, the surface meteorological fields were few changed by intense weather events due to proximity to the ocean and the predominant contribution of the northeasterly trade winds. There was also a weak sea breeze signal that maintained the horizontal moisture flow in the studied area. On dry days, the PBL depth was higher, drier, and warmer, resulting in stronger winds below 500 m. Moreover, trends throughout the period suggest that PBLs are near-neutral below 500 m. However, the wind variability was intensified by up to 20% due to downdrafts and higher wind shears during the deep convection mechanisms derived by UTCV. Furthermore, ITCZ mixed rainfall cooled the PBL at approximately 2 K, making it very stable according to the Richardson number classification adopted. The observed temporal and spatial scale represent challenges to the physical parameterizations used to improve numerical weather prediction models over tropical coastal areas. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108951
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Centro de Previsão do Tempo e Estudos Climáticos, Instituto Nacional de Pesquisas Espaciais, Cachoeira Paulista, São Paulo, Brazil; Instituto de Aeronáutica e Espaço, Departamento de Ciência e Tecnologia Aeroespacial, São José dos Campos, São Paulo, Brazil
Recommended Citation:
Ramos D.N.D.S.,Fernandez J.P.R.,Fisch G.. Evolution of the Planetary Boundary Layer on the northern coast of Brazil during the CHUVA campaign[J]. Atmospheric Research,2018-01-01,203