DOI: 10.1016/j.atmosres.2018.04.008
Scopus记录号: 2-s2.0-85046792726
论文题名: Seasonal variability of aerosol absorption parameters at a remote site with high mineral dust loads
作者: Nicolás J.F. ; Castañer R. ; Crespo J. ; Yubero E. ; Galindo N. ; Pastor C.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 210 起始页码: 100
结束页码: 109
语种: 英语
英文关键词: Absorption angstrom exponent
; Absorption coefficient
; Mountain site
; Particulate matter
; Planetary boundary layer
; Saharan dust events
Scopus关键词: Atmospheric thermodynamics
; Boundary layers
; Bromine compounds
; Minerals
; Absorption co-efficient
; Angstrom exponent
; Mountain site
; Particulate Matter
; Planetary boundary layers
; Saharan dust
; Dust
; absorption coefficient
; aerosol
; air mass
; boundary layer
; dust
; mineral
; particulate matter
; seasonal variation
; summer
; winter
; Iberian Peninsula
; Sahara
英文摘要: Measurements of particulate matter (PM), absorption coefficient (σap) and Absorption Angstrom Exponent (AAE) have been performed during three years (2014–2016) at a remote site (1558 m a.s.l) located in the southeast of the Iberian Peninsula, close to the Mediterranean coast. Mean values ± (standard deviation) of the measured parameters were: PM10 (11.3 ± 19.8 μg⋅m−3), PM1 (3.0 ± 1.9 μg⋅m−3), σap (2.18 ± 1.45 Mm−1/λ = 520 nm) and AAE (1.190 ± 0.225). PM concentrations and σap were maxima during summer, while AAE values were highest during the colder months, as expected for high altitude environments with scarce human activity. The influence that both, air masses coming from the Sahara desert loaded with mineral dust (SDE) and the height of the Planetary Boundary Layer (PBL), had on the studied parameters was also analyzed. During SDEs, σap and AAE levels increased. These increments were slightly higher when the sampling point was located within the free troposphere (FT) and correlated with the intensity of the event. In the case of SDEs with high mineral dust (MD) concentrations, AAE values increased up to 30% and σap values were more than double compared to average values for non-event days. However, the seasonal variability of the optical parameters could not be attributed to these episodes since the MD load at the sampling point did not show significant seasonal differences. For this reason, the different spectral absorption behavior observed between the warmest and the coldest months may be attributed to the seasonal differences in the percentage contribution of Brown Carbon (BrC) to PM levels. These results indicate that for short wavelengths (UV and VIS), the absorption due to non-BC absorbers during the winter was almost twice that registered during summer time. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108847
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: Atmospheric Pollution Laboratory (LCA), Department of Applied Physics, Miguel Hernández University, Avenida de la Universidad S/N, Elche, 03202, Spain
Recommended Citation:
Nicolás J.F.,Castañer R.,Crespo J.,et al. Seasonal variability of aerosol absorption parameters at a remote site with high mineral dust loads[J]. Atmospheric Research,2018-01-01,210