DOI: 10.1016/j.atmosenv.2015.10.028
Scopus记录号: 2-s2.0-84948151641
论文题名: On the concentration and size distribution of sub-micron aerosol in the Galápagos Islands
作者: Sorribas M ; , Gómez Martín J ; C ; , Hay T ; D ; , Mahajan A ; S ; , Cuevas C ; A ; , Agama Reyes M ; V ; , Paredes Mora F ; , Gil-Ojeda M ; , Saiz-Lopez A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123 起始页码: 39
结束页码: 48
语种: 英语
英文关键词: Marine boundary layer
; SMPS
; Sub-micrometre particle
Scopus关键词: Aerosols
; Atmospheric boundary layer
; Boundary layers
; Shape memory effect
; Size distribution
; Atmospheric marine boundary layer
; Background concentration
; Critical supersaturation
; Marine boundary layers
; New particle formation
; Number size distribution
; Particle concentrations
; SMPS
; Atmospheric movements
; ammonium sulfate
; volatile organic compound
; aerosol
; Aitken nucleus
; biogenic emission
; boundary layer
; cloud droplet
; concentration (composition)
; entrainment
; human activity
; size distribution
; stratus
; sulfate
; aerosol
; air temperature
; Article
; boundary layer
; Chile
; cloud
; dry deposition
; environment
; island (geological)
; particle size
; priority journal
; solar radiation
; troposphere
; vegetation
; Chile
; Ecuador
; Galapagos Islands
; San Cristobal [Galapagos Islands]
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: During the CHARLEX campaign in the Galápagos Islands, a Scanning Particle Mobility Sizer was deployed on San Cristobal Island in July-August 2011 to carry out size-resolved measurements of the concentration of submicron aerosols. To our knowledge these are the first measurements of aerosol concentrations in this unique environment. The particles with marine origin displayed a tri-modal number size distribution with peak diameters of 0.016 μm, 0.050 μm and 0.174 μm and a cloud-processed intermodal minimum at 0.093 μm. The mean total aerosol number concentration for the marine contribution was 470 ± 160 cm-3. A low particle concentration of 70 ± 50 cm-3 for the nucleation size range was measured, but no evidence of new particle production in the atmospheric marine boundary layer (MBL) was observed. The concentration of the Aitken size mode was found to be related to aerosol entrainment from the free troposphere off the coast of Chile followed by transport within the MBL to the Galápagos Islands. Cloud processing may activate the particles in the Aitken size range, growing through 'in-cloud' sulphate production and increasing the particle concentration in the accumulation size range. The 0.093 μm cloud processed minima suggests that the critical supersaturation at which the particle is activated to a cloud droplet is in the 0.14-0.21% range. The daytime marine particle background concentration was influenced by human activity around the sampling site, as well as by new particle formation triggered by biogenic emissions from the vegetation cover of the island's semiarid lowlands. Effective CCN formation may play a role in the formation and properties of the stratus clouds, which permanently cover the top of the windward side of the islands and establish one of their characteristic climatic bands. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81341
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Applied Physics, University of Granada, Granada, Spain; Andalusian Institute for Earth System Research (IISTA), University of Granada, Spain; Atmospheric Chemistry and Climate Group, Institute of Physical Chemistry Rocasolano, CSIC, Madrid, Spain; National Institute for Meteorology and Hydrology (INAMHI), Quito, Ecuador; Atmospheric Research and Instrumentation Branch, National Institute for Aerospace and Technology (INTA), Madrid, Spain; School of Chemistry, University of Leeds, Leeds, United Kingdom; Indian Institute of Tropical Meteorology (IITM), Pune, India
Recommended Citation:
Sorribas M,, Gómez Martín J,C,et al. On the concentration and size distribution of sub-micron aerosol in the Galápagos Islands[J]. Atmospheric Environment,2015-01-01,123