DOI: 10.1016/j.atmosres.2018.07.018
Scopus记录号: 2-s2.0-85050152856
论文题名: CCN activation properties at a tropical hill station in Western Ghats during south-west summer monsoon: Vertical heterogeneity
作者: Jayachandran V. ; Nair V.S. ; Babu S.S.
刊名: Atmospheric Research
ISSN: 1698095
出版年: 2018
卷: 214 起始页码: 36
结束页码: 45
语种: 英语
英文关键词: Aerosol optical properties
; CCN activation fraction
; Cloud condensation nuclei
; Vertical heterogeneity
Scopus关键词: Aerosols
; Atmospheric thermodynamics
; Chemical activation
; Condensation
; Location
; Sea level
; Tropics
; Activation property
; Aerosol optical property
; Ccn activations
; Cloud condensation nuclei
; Fine-mode particles
; Mass concentration
; Number concentration
; Vertical heterogeneity
; Optical properties
; absorption coefficient
; aerosol property
; cloud condensation nucleus
; concentration (composition)
; heterogeneity
; monsoon
; scattering
; summer
; India
; Western Ghats
英文摘要: Cloud Condensation Nuclei (CCN) concentrations, aerosol number concentrations larger than about 3 nm (CN), and aerosol scattering and absorption coefficient measurements carried out at a hill station (Ponmudi, 8.8°N, 77.1°E, ~960 m amsl) located on Western Ghats and at a nearby coastal location (Thumba, 8.5°N, 76.9°E, ~3 m amsl) in the peninsular India during summer monsoon period are used to investigate the vertical heterogeneity in the activation properties and its association with the aerosol optical properties. CCN concentration over the hill station depicted high values during daytime and low values during nighttime, whereas an opposite pattern in CCN is observed over the coastal site. The intrinsic properties like CCN activation fraction and Twomey's empirical fit (k value) show insignificant diurnal variation over the hill station in contrast to the coastal location where the land-sea breeze circulation modify the prevailing airmasses over the sampling site. The percentage of CN acting as CCN at 0.4% supersaturation is about 25% at Ponmudi and is about 46% at Thumba. The higher scattering angstrom exponent observed at Ponmudi indicates the consistent presence of fine mode particles. CCN concentration at both Ponmudi and Thumba show a good linear correlation with scattering aerosol index. The association between CCN number concentrations and BC mass concentrations suggest that carbonaceous combustion sources influence CCN at Ponmudi. Even though marine airmass prevails over both locations due to the onset of the summer monsoon, CCN activation properties are distinct at the mean sea level and at an altitude of 1 km above the coastal region. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/108734
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: Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram, India
Recommended Citation:
Jayachandran V.,Nair V.S.,Babu S.S.. CCN activation properties at a tropical hill station in Western Ghats during south-west summer monsoon: Vertical heterogeneity[J]. Atmospheric Research,2018-01-01,214