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Title:
Particle Nucleation and Growth During the NIFTy Experiment
Authors:
Barthelmie, R. J.; Pryor, S. C.; Spaulding, A. M.; Rossner, A.; Crimmins, B.; Hopke, P. K.; Mauldin, L.; Jobson, T.; Petaja, T.
Affiliation:
AA(Edinburgh University, School of Engineering and Electronics, Edinburgh, EH9 3JL, United Kingdom ; Indiana University, Atmospheric Science Program, Bloomington, IN 47405, United States ; ), AB(Indiana University, Atmospheric Science Program, Bloomington, IN 47405, United States ; ), AC(Indiana University, Atmospheric Science Program, Bloomington, IN 47405, United States ; ), AD(Clarkson University, Department of Chemical Engineering, Potsdam, NY 13699, United States ; ), AE(Clarkson University, Department of Chemical Engineering, Potsdam, NY 13699, United States ; ), AF(Clarkson University, Department of Chemical Engineering, Potsdam, NY 13699, United States ; ), AG(NCAR, Atmospheric Chemistry Division, Boulder, CO 80305, United States ; ), AH(Washington State University, Department of Civil & Environmental Engineering, Pullmann, WA 99164, United States ; ), AI(University of Helsinki, Division of Atmospheric Sciences, Helsinki, 00014, Finland ; )
Publication:
American Geophysical Union, Fall Meeting 2008, abstract #A12C-06
Publication Date:
12/2008
Origin:
AGU
AGU Keywords:
0305 Aerosols and particles (0345, 4801, 4906), 0315 Biosphere/atmosphere interactions (0426, 1610), 0345 Pollution: urban and regional (0305, 0478, 4251), 0365 Troposphere: composition and chemistry
Abstract Copyright:
(c) 2008: American Geophysical Union
Bibliographic Code:
2008AGUFM.A12C..06B

Abstract

The measurements presented herein are being collected in order to assess the frequency and characteristics of nucleation events and high ultra-fine particle concentrations in this rural (but regionally polluted) setting, including the chemical composition of the ultra-fine particles, the principal mechanisms of nucleation, limitations on nucleation and growth and the ultimate fate of the resulting ultra-fine particles. We present a year of data from continuous measurements of particle size distributions (6 to 400 nm) at three- levels above and within a deciduous forest in southern Indiana (in the Ohio River Valley). These data are collected using two SMPS and one FMPS, and are supplemented with data concerning the spatial extent and the composition of ultra-fine particles using samples collected during May 2008 as part of the Nucleation In ForesTs (NIFTY) campaign. The long-term measurements indicate evidence of class A nucleation events on approximately 1 day in 5, and lesser magnitude or less well defined events on another 15% of days. These data indicate nucleation is most frequently observed in spring, but occurs in all seasons and subsequent growth is more rapid during leaf-on. During the NIFTY field experiment we enhanced the ongoing data collection at the forest site to include sulfuric acid, ammonia and VOC concentrations, and particle composition using two MOUDI-nano-MOUDI combinations. Preliminary analyses of these data indicate that the sub-32 nm diameter particles are almost completely ammonium-sulfate or ammonium-bisulfate and associated water but there is evidence that continued growth is aided by the addition of condensable organics. We further instrumented two additional sites - one directly south of the forest in a relatively rural setting, and one to the north in the city of Indianapolis. Results from these sites indicate strong evidence that the events are regional but the sites differ in terms of the magnitude of the events and the relative growth behavior.
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