TITLE

Measurements of coarse mode and primary biological aerosol transmission through a tropical forest canopy using a dual-channel fluorescence aerosol spectrometer

AUTHOR(S)
Gabey, A. M.; Gallagher, M. W.; Whitehead, J.; Dorsey, J.
PUB. DATE
September 2009
SOURCE
Atmospheric Chemistry & Physics Discussions;2009, Vol. 9 Issue 5, p18965
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Aerosol in the size range 0.8-20 μm was characterized according to optical equivalent diameter, DP , morphology and the presence of biological material, the latter determined by recording fluorescence excited by ultraviolet light pulses at two different wavelengths. Single-particle measurements were performed within and subsequently above a tropical rainforest in Borneo, Malaysia, in June and July 2008. In both locations the aerosol number size distribution exhibited a primary biological aerosol (PBA) mode sized 2 μm2 μm and possessed a wider morphological range than non-PBA. It also accounted for around 80% of the total number in the understory and 40% of the total number above canopy. Canopy transmission efficiencies for the total aerosol number and PBA are calculated to be 0.48±0.19 and 0.31±0.15 respectively, with the former appearing to peak during the daytime because of a lack of PBA emission below the canopy.
ACCESSION #
47188690

 

Related Articles

  • Real-Time Fluorescence Measurement of Airborne Bacterial Particles Using an Aerosol Fluorescence Sensor with Dual Ultraviolet- and Visible-Fluorescence Channels. Jung, Jae Hee; Lee, Jung Eun; Bae, Gwi-Nam // Environmental Engineering Science;Oct2012, Vol. 29 Issue 10, p987 

    In the search for methods by which an ambient environment can be continuously monitored for potentially harmful biological aerosols, particle fluorescence methods have received considerable attention over the past decade. The aerosol fluorescence sensor (AFS) is a monitoring device for...

  • The fluorescence properties of aerosol larger than 0.8 µm in an urban and a PBA-dominated location. Gabey, A. M.; Stanley, W. R.; Gallagher, M. W.; Kaye, P. H. // Atmospheric Chemistry & Physics Discussions;2011, Vol. 11 Issue 1, p531 

    Dual-wavelength Ultraviolet light-induced fluorescence (UV-LIF) measurements were performed on ambient environmental aerosol in Manchester, UK (urban city centre, winter) and Borneo, Malaysia (remote, tropical), which are taken to represent environments with negligible and significant primary...

  • Interactions of intense ultraviolet laser radiation with solid aerosols. Poulain, D. E.; Alexander, D. R.; Barton, J. P.; Schaub, S. A.; Zhang, J. // Journal of Applied Physics;3/1/1990, Vol. 67 Issue 5, p2283 

    Provides information on a study which examined the characterizations of the interaction of intense ultraviolet laser radiation with small solid aerosols. Observation on the interaction dynamics and velocity of expelled material in plasma formation; Discussion of small solid aerosol particles;...

  • Aerosol effects on UV radiation. Koepke, P.; Reuder, J.; Schwander, H. // AIP Conference Proceedings;2000, Vol. 534 Issue 1, p581 

    The reduction of erythemally weighted UV-irradiance (given as UV index, UVI) due to aerosols is analyzed by variation of the tropospheric particles in a wide, but realistic range. Varied are amount and composition of the particles and relative humidity and thickness of the mixing layer. The...

  • Airborne rhinovirus detection and effect of ultraviolet irradiation on detection by a semi-nested RT-PCR assay. Myatt, Theodore A.; Johnston, Sebastian L.; Rudnick, Stephen; Milton, Donald K. // BMC Public Health;2003, Vol. 3 Issue 1, p5 

    Background: Rhinovirus, the most common cause of upper respiratory tract infections, has been implicated in asthma exacerbations and possibly asthma deaths. Although the method of transmission of rhinoviruses is disputed, several studies have demonstrated that aerosol transmission is a likely...

  • Ozonolysis of ð-pinene: parameterization of secondary organic aerosol mass fraction. Pathak, R. K.; Presto, A. A.; Lane, T. E.; Stanier, C. O.; Donahue, N. M.; Pandis, S. N. // Atmospheric Chemistry & Physics Discussions;2007, Vol. 7 Issue 1, p1941 

    Existing parameterizations tend to underpredict the α-pinene aerosol mass fraction (AMF) by a factor of 2-5 at low organic aerosol concentrations (<5 µg m-3). A wide range of smog chamber results obtained at various conditions (low/high NOx, presence/ absence of UV radiation, dry/humid...

  • Mechanism of UV-light induced SO2 oxidation to H2SO4. Sorokin, A. // Atmospheric Chemistry & Physics Discussions;2009, Vol. 9 Issue 6, p24411 

    The electron-excited chemistry of sulfur dioxide oxidation induced by UV irradiation of air with trace O3 and SO2 is considered. The importance of this mechanism is evaluated based on recent laboratory experiments on SO2 oxidation in a laminar tube with air induced by UV irradiation. Results...

  • Temporal and spectral variation of desert dust and biomass burning aerosol scenes from 1995-2000 using GOME. De Graaf, M.; Stammes, P.; Aben, I. // Atmospheric Chemistry & Physics Discussions;2006, Vol. 6 Issue 1, p1321 

    Global Ozone Monitoring Experiment (GOME) Absorbing Aerosol Index (AAI) and AAI-related residue data were used to investigate areas with UV-absorbing aerosols. Time series of regionally averaged residues show the seasonal variation and trends of aerosols and clouds in climatologically important...

  • Up variability in Moscow according to long-term Up measurements and reconstruction model. Chubarova, N. Y. // Atmospheric Chemistry & Physics Discussions;2008, Vol. 8 Issue 1, p893 

    Long-term measurements of erythemally weighted UV irradiance (Qer) have been analyzed for the 1999-2006 period as well as UV variability according to reconstruction model since 1968. The estimates of different atmospheric parameters effects, including NO2 content, on Qer have been obtained on...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics