DOI: 10.1175/JCLI-D-14-00600.1
Scopus记录号: 2-s2.0-84957712297
论文题名: Thirty years of atmospheric extinction from telescopes of the North Atlantic Canary Archipelago
作者: Laken B.A. ; Parviainen H. ; García-Gil A. ; Muñoz-Tuñón C. ; Varela A.M. ; Fernandez-Acosta S. ; Pallé P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 1 起始页码: 227
结束页码: 240
语种: 英语
Scopus关键词: Aerosols
; Atmospheric aerosols
; Light extinction
; Statistics
; Telescopes
; Time series
; Annual variations
; Seasonal variability
; Situ atmospheric observations
; Statistical techniques
; Variability
; Dust
; aerosol composition
; aerosol formation
; algorithm
; annual variation
; numerical model
; time series analysis
; Canary Islands
; Spain
英文摘要: This study examines 30 years of atmospheric extinction, τ, obtained from both stellar and solar telescope measurements, at ~2.4 km MSL, from the North Atlantic Canary Archipelago-an island chain located at approximately 28°N, around 100 km from the west coast of Africa. Data fromthree AERONET monitors, located at varying heights on one of the main islands, were also used, although these are only available over a shorter (< 10 yr) period. The Canary Archipelago is regularly affected by dust intrusions into the local atmosphere as they intersect one of the primary export pathways of mineral dust fromthe Sahara. The τ of "baseline" and "dust influenced" conditions were statistically distinguished by fitting normal-gamma mixture distributions to the observations using Markov chainMonte Carlo methods, and then the seasonal and long-term characteristics of these data were examined. The telescope data show that baseline conditions are usually stable at τ < 0.1 (except during periods influenced by volcanic aerosols) and indicate the existence of a low-amplitude (τ=0:01) seasonal variation. During dust-influenced conditions, τ regularly reaches values of a factor of 2-6 times higher than normal. The majority of dust intrusions take place during the months of July and August, when they may occur 44 ± 15% of the time, predominantly at high altitudes (with ~94.361.6% of intrusions occurring >2.4 km),whereas during themonths of November-May, dust intrusions occur far less frequently (~19 6 7%) and are more common at lower altitudes- with intrusions at < 2.4 km comprising ~79.5 6 3.2% of all outbreaks. Year-to-year variations in the frequency of dust-influenced conditions (of ~9%) were found but no long-term trend over the observed 30-yr period. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50040
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences, University of Oslo, Oslo, Norway; Department of Physics, Oxford University, Oxford, England, United Kingdom; Agencia Estatal de Meteorología, Izaña Atmospheric Research Center, Santa Cruz de Tenerife, Instituto de Astrofísica de Canarias, San Cristóbal de La Laguna, Tenerife, Spain; Instituto de Astrofísica de Canarias, Department of Astrophysics, Universidad de La Laguna, San Cristóbal de La Laguna, Tenerife, Spain
Recommended Citation:
Laken B.A.,Parviainen H.,García-Gil A.,et al. Thirty years of atmospheric extinction from telescopes of the North Atlantic Canary Archipelago[J]. Journal of Climate,2016-01-01,29(1)