DOI: 10.1175/JCLI-D-11-00610.1
Scopus记录号: 2-s2.0-84870051148
论文题名: Marine boundary layer cloud observations in the Azores
作者: Rémillard J. ; Kollias P. ; Luke E. ; Wood R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 21 起始页码: 7381
结束页码: 7398
语种: 英语
Scopus关键词: Air motion
; Atmospheric radiation measurement programs
; Boundary layer clouds
; Cloud base
; Cloud cover
; Cloud types
; Cumulus cloud
; Data sets
; Field campaign
; High frequency
; Liquid water paths
; Marine boundary layer clouds
; Marine boundary layers
; Mobile facility
; Single layer
; Stratiform clouds
; Stratocumulus clouds
; Transition layers
; Boundary layers
; Clouds
; Inversion layers
; Radiometry
; Precipitation (meteorology)
; anticyclone
; boundary layer
; cloud cover
; cumulus
; marine atmosphere
; observational method
; precipitation assessment
; stratiform cloud
; stratocumulus
; temporal variation
; updraft
; Azores
; Graciosa [Azores]
; Portugal
英文摘要: The recent deployment of the Atmospheric Radiation Measurement Program (ARM) Mobile Facility at Graciosa Island, Azores, in the context of the Clouds, Aerosol and Precipitation in the Marine Boundary Layer (CAP-MBL) field campaign added the most extensive (19 months) and comprehensive dataset of marine boundary layer (MBL) clouds to date. Cloud occurrence is high (60%-80%), with a summertime minimum. Liquid precipitation is frequently present (30%-40%), mainly in the form of virga. Boundary layer clouds are themost frequently observed cloud type (40%-50%) with a maximum of occurrence during the summer and fall months under the presence of anticyclonic conditions. Cumulus clouds are the most frequently occurring MBL cloud type (20%) with cumulus under stratocumulus layers (10%-30%) and single-layer stratocumulus (0%-10%) following in frequency of occurrence. A stable transition layer in the subcloud layer is commonly observed (92% of the soundings). Cumulus cloud bases and stratocumulus cloud tops correlate very well with the top of the transition layer and the inversion base, respectively. Drizzling stratocumulus layers are thicker (350-400 m) and have higher liquid water path (75-150 g m-2) than their nondrizzling counterparts (100-250 m and 30-75 g m-2, respectively). The variance of the vertical air motion is maximum near the cloud base and is higher at night. The updraftmass flux is around 0.17 kg m-2 s-1 with 40%-60%explained by coherent updraft structures. Despite a high frequency of stratocumulus clouds in the Azores, theMBL is almost never well mixed and is often cumulus coupled. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52132
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada; Atmospheric Sciences Division, Brookhaven National Laboratory, Upton, NY, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States
Recommended Citation:
Rémillard J.,Kollias P.,Luke E.,et al. Marine boundary layer cloud observations in the Azores[J]. Journal of Climate,2012-01-01,25(21)