HR: 1340h
AN: A33E-1645    [Abstracts]
TI: Chemical Characterization of Carbonaceous Aerosols in the Caribbean: Results From 2003- 2007
AU: * Repollet-Pedrosa, M H
EM: milton@adam.uprr.pr
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: * Repollet-Pedrosa, M H
EM: milton@adam.uprr.pr
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Mayol-Bracero, O L
EM: omayol@adam.uprr.pr
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: Mayol-Bracero, O L
EM: omayol@adam.uprr.pr
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Morales-Garcia, F
EM: falvia@adam.uprr.pr
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: Morales-Garcia, F
EM: falvia@adam.uprr.pr
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Gioda, A
EM: adriana@adam.uprr.pr
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: Gioda, A
EM: adriana@adam.uprr.pr
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Reyes-Rodriguez, G J
EM: gabillo2000@gmail.com
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: Reyes-Rodriguez, G J
EM: gabillo2000@gmail.com
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Santiago-Pagan, L M
EM: lourdes.m.santiago@uprrp.edu
AF: Intitute of Tropical Ecosystem Studies, University of Puerto Rico PO Box 21910, San Juan, PR 00931-1910, Puerto Rico
AU: Santiago-Pagan, L M
EM: lourdes.m.santiago@uprrp.edu
AF: Department of Chemistry, University of Puerto Rico PO Box 23346, San Juan, PR 00931-3346, Puerto Rico
AU: Decesari, S
EM: s.decesari@isac.cnr.it
AF: Institute of Atmospheric Sciences and Climate, National Council for Research, Via Gobetti 101, Bologna, IT 40129, Italy
AU: Kasper-Giebl, A
EM: akasper@mail.zserv.tuwien.ac.at
AF: Institute for Chemical Technologies and Analytics, Vienna University of Technology Getreidemarkt 9/151, Vienna, AT 1060, Austria
AB: Carbonaceous aerosols may play a significant role in radiative forcing, with both OC and EC affecting the extinction of solar radiation. Despite the potential importance of carbonaceous aerosols in radiative and climate forcing relatively little information is available in terms of its worldwide concentrations, sources, mechanisms of formation, and radiative and nucleative properties. Over the last four years, 2003-2007, our laboratory has focused part of the investigation in the study of the carbonaceous fraction of aerosols in the trade winds. Samples have been collected in Cape San Juan (CSJ), Puerto Rico, using stacked-filter units (SFUs). 5-day back trajectories calculated with the HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) model from NOAA Air Resources Laboratory along with daily satellite images of aerosol optical thickness were used to have a better understanding of the air masses origin. Thermal-optical analysis (EC/OC analyzer) was used to determine the concentrations of the carbonaceous fraction, i.e., total carbon (TC), organic carbon (OC), and elemental carbon (EC). Results showed that the concentrations of OC range from 9 to 380 ng/m³, with an average value of ~200 ng/m³. The average value for the positive artifact at CSJ was 50%, clearly showing that if the correction of the positive artifact is not performed OC concentrations could be significantly overestimated. The particulate organic matter fraction represents from 2 to 50% of the total aerosol mass and up to about 90% of the non-sea-salt mass. We further present a complete dataset showing the relationship between the origin of the air masses and the concentrations of the carbonaceous fraction.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 4801 Aerosols (0305, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting