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Aerosol Fluxes and Dynamics Within and Above a Tropical Rainforest in South-east Asia : Volume 10, Issue 5 (07/05/2010)

By Whitehead, J. D.

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Book Id: WPLBN0003995339
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: Aerosol Fluxes and Dynamics Within and Above a Tropical Rainforest in South-east Asia : Volume 10, Issue 5 (07/05/2010)  
Author: Whitehead, J. D.
Volume: Vol. 10, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Robinson, N., Dorsey, J. R., Coe, H., Gallagher, M. W., Davies, F., Mcfiggans, G.,...Flynn, M. J. (2010). Aerosol Fluxes and Dynamics Within and Above a Tropical Rainforest in South-east Asia : Volume 10, Issue 5 (07/05/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre for Atmospheric Science, SEAES, University of Manchester, Simon Building, Brunswick Street, Manchester M13 9PL, UK. Atmospheric aerosol measurements were conducted near Danum Valley, in the Malaysian state of Sabah, North-East Borneo, as part of the OP3 and ACES projects, in April and June/July 2008. Here, aerosol fluxes and diurnal variability in and above the rainforest canopy were examined in order to gain an understanding of their dynamics in the surface layer of the South-East Asian rainforest. Aerosol fluxes were calculated by eddy covariance from measurements above the rainforest canopy on the Global Atmosphere Watch (GAW) tower. Upward fluxes were seen on most mornings between 09:00 and 11:00 local time and this could be attributed to venting of the nocturnal boundary layer as it broke up in the morning. Measurements were also conducted below and within canopy at a nearby site. Profiles in aerosol number concentrations were investigated using GRIMM Optical Particle Counters (OPCs) at various levels within the rainforest canopy as well as a single OPC on a vertically moving platform. These showed an overnight increase in larger particles (1–20 Μm) at all levels, but much more prominently near the top of the canopy, which could be attributed to fog formation. At ground level, number concentrations in this size range correlated with enhancements in biological aerosol concentrations, measured using a Wide Issue Bioaerosol Spectrometer (WIBS) located near the forest floor, suggesting that coarse particle number concentrations were dominated by biological aerosols. A comparison of particle number concentrations (in the size range 0.5–1.0 Μm) between above and below canopy showed correlations, despite turbulence data suggesting persistent decoupling between the two measurement sites. These correlations often relied on a shift of the particle time-series against each other, implying a time delay in observations between the sites, which varied according to time of day. This lag time was shortest during the middle of the day by a significant margin. This was not observed for aerosols larger than 1.0 Μm. Further evidence of daytime coupling between above and below canopy in terms of aerosol measurements is implied by comparison of measurements from an Aerosol Mass Spectrometer (AMS) at the GAW tower and simultaneous bag sampling at the in-canopy site, subsequently analysed with the AMS. Transport of particles through the canopy seems to occur through large-scale, sporadic turbulent events, suggesting that the coupling between the canopy space and the air above is due to these ventilation events.

Summary
Aerosol fluxes and dynamics within and above a tropical rainforest in South-East Asia

Excerpt
Ahlm, L., Nilsson, E. D., Krejci, R., Mårtensson, E. M., Vogt, M., and Artaxo, P.: Aerosol number fluxes over the Amazon rain forest during the wet season, Atmos. Chem. Phys., 9, 9381–9400, doi:10.5194/acp-9-9381-2009, 2009.; Allen Jr., L. H.,, Lemon, E., and Müller, L.: Environment of a Costa Rican forest, Ecology, 53, 102–111, 1972.; Andreae, M. O., Artaxo, P., Brandão, C., Carswell, F. E., Ciccioli, P., da Costa, A. L., Culf, A. D., Esteves, J. L., Gash, J. H. C., Grace, J., Kabat, P., Lelieveld, J., Malhi, Y., Manzi, A. O., Meixner, F. X., Nobre, A. D., Nobre, C., Ruivo, M. d. L. P., Silva-Dias, M. A., Stefani, P., Valentini, R., von Jouanne, J., and Waterloo, M. J.: Biogeochemical cycling of carbon, water, energy, trace gases, and aerosols in Amazonia: The LBA-EUSTACH experiments, J. Geophys. Res., 107, 8066, doi:8010.1029/2001JD000524, 2002.; Artaxo, P., Maenhaut, W., Storms, H., and Grieken, R. V.: Aerosol characteristics and sources for the Amazon Basin during the wet season, J. Geophys. Res., 95, 16971–16985, 1990.; Artaxo, P., Gerab, F., Yamasoe, M. A., and Martins, J. V.: Fine mode aerosol composition at three long-term atmospheric monitoring sites in the Amazon Basin, J. Geophys. Res., 99, 22857–22868, 1994.; Kavouras, I. G., Mihalopoulas, N., and Stephanou, E. G.: Formation of atmospheric particles from organic acids produced by forests, Nature, 395, 683–686, 1998.; Artaxo, P., Martins, J. V., Yamasoe, M. A., Procópio, A. S., Pauliquevis, T. M., Andreae, M. O., Guyon, P., Gatti, L. V., and Leal, A. M. C.: Physical and chemical properties of aerosols in the wet and dry seasons in Rhond�nia, Amazonia, J. Geophys. Res., 107, 8081, doi:8010.1029/2001JD000666, 2002.; DeCarlo, P. F., Kimmel, J. R., Trimborn, A., Northway, M. J., Jayne, J. T., Aiken, A. C., Gonin, M., Fuhrer, K., Horvath, T., Docherty, K. S., Worsnop, D. R., and Jimenez, J. L.: Field-deployable, high resolution, time-of-flight aerosol mass spectrometer, Anal. Chem., 78, 8281–8289, 2006.; Farmer, D. K., Kimmel, J. R., Nemitz, E., Phillips, G., Docherty, K., Chen, Q., Martin, S., Cubison, M., Jimenez, J.: A new approach to chemically-speciated submicron aerosol fluxes over tropical and temperate forests, American Geophysical Union, Fall Meeting 2008, San Francisco, USA, 15–19 December 2008, abstract A51H-0204, 2008.; Finnigan, J.: Turbulence in plant canopies, Annu. Rev. Fluid Mech., 32, 519–571, 2000.; Fitzjarrald, D. R. and Moore, K. E.: Mechanisms of nocturnal exchange between the rain forest and the atmosphere, J. Geophys. Res., 95, 16839–16850, 1990.; Fitzjarrald, D. R., Moore, K. E., Cabral, O. M. R., Scolar, J., Manzi, A. O., and de Abreu, L. D., Sá: Daytime turbulent exchange between the Amazon forest and the atmosphere, J. Geophys. Res., 95, 16825–16838, 1990.; Foken, T. and Wichura, B.: Tools for quality assessment of surface-based flux measurements, Agr. Forest Meteorol., 79, 83–105, 1996.; Foken, T.: Micrometeorology, Springer-Verlag, Berlin, 306 pp., 2006.; Foot, V. E., Kaye, P. H., Stanley, W. R., Barrington, S. J., Gallagher, M., and Gabey, A.: Low-cost real-time multiparameter bio-aerosol sensors, Proc. SPIE, 7116, 71160I, doi:10.1117/12.800226, 2008.; Fowler, D., Cape, J. N., and Unsworth, M. H.: Deposition of atmospheric pollutants on forests, Philos. T. Roy. Soc. London B, 324, 247–265, 1989.; Gabey, A. M., Gallagher, M. W., Whitehead, J., and Dorsey, J.: Measurements of coarse mode and primary biological aerosol transmission through a tropical forest canopy using a dual-channel fluorescence aerosol spectrometer, Atmos. Chem. Phys. Discuss., 9, 18965–18984, doi:10.5194/acpd-9-18965-2009, 2009.; Gao, W., Shaw, R. H., and Paw U, K. T.: Observation of organized structure in turbulent flow within and above a forest canopy, Bound.-Lay. Meteorol., 47, 349–377, 1989.; Garland, J. A.: The dry deposition of sulphur dioxide to land and water surfaces, Proc. Roy. Soc. Lond. A, 354, 245–268, 1977.; Gerber, H.: Direct measurement of suspend

 

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