DOI: 10.1175/JCLI-D-15-0757.1
Scopus记录号: 2-s2.0-84974855185
论文题名: Coastal clouds at the Eastern Margin of the Southeast Pacific: Climatology and trends
作者: Muñoz R.C. ; Quintana J. ; Falvey M.J. ; Rutllant J.A. ; Garreaud R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 12 起始页码: 4525
结束页码: 4542
语种: 英语
Scopus关键词: Boundary layers
; Climatology
; Cloud cover
; Coastal meteorologies
; Coastlines
; Geographic location
; South America
; Trends
; Variability
; Meteorology
; atmospheric circulation
; atmospheric dynamics
; atmospheric structure
; boundary layer
; climatology
; cloud cover
; coastal zone
; trend analysis
; Pacific Ocean
; Pacific Ocean (Southeast)
英文摘要: The climatology and recent trends of low-level coastal clouds at three sites along the northern Chilean coast (18.3°-23.4°S) are documented based upon up to 45 years of hourly observations of cloud type, coverage, and heights. Consistent with the subtropical location, cloud types are dominated by stratocumuli having greatest coverage (> 7 oktas) and smaller heights (600-750 m) during the nighttime of austral winter and spring. Meridionally, nighttime cloud fraction and cloud-base heights increase from south to north. Long-term trends in mean cloud cover are observed at all sites albeit with a seasonal modulation, with increasing (decreasing) coverage in the spring (fall). Consistent trend patterns are also observed in independent sunshine hour measurements at the same sites. Cloud heights show negative trends of about 100 m decade-1 (1995-2010), although the onset time of this tendency differs between sites. The positive cloud fraction trends during the cloudy season reported here disagree with previous studies, with discrepancies attributed to differences in datasets used or to methodological differences in data analysis. The cloud-base height tendency, together with a less rapid lowering of the subsidence inversion base height, suggests a deepening of the coastal cloud layer. While consistent with the tendency toward greater low-level cloud cover and the known cooling of the marine boundary layer in this region, these tendencies are at odds with a drying trend of the near-surface air documented here as well. Assessing whether this intriguing result is caused by physical factors or by limitations of the data demands more detailed observations, some of which are currently under way. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49918
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geophysics, University of Chile, Santiago, Chile; Dirección Meteorológica de Chile, Santiago, Chile; Center for Advanced Studies in Arid Zones (CEAZA), La Serena, Chile; Center for Climate and Resilience Research, University of Chile, Santiago, Chile
Recommended Citation:
Muñoz R.C.,Quintana J.,Falvey M.J.,et al. Coastal clouds at the Eastern Margin of the Southeast Pacific: Climatology and trends[J]. Journal of Climate,2016-01-01,29(12)