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Coupling an aerosol box model with one-dimensional flow: a tool for understanding observations of new particle formation events

Kivekäs, Niku and Carpman, Jimmie and Roldin, Pontus and Leppä, Johannes and O'Connor, Ewan and Kristensson, Adam and Asmi, Eija (2016) Coupling an aerosol box model with one-dimensional flow: a tool for understanding observations of new particle formation events. Tellus B, 68 . Art. No. 29706. ISSN 0280-6509. http://resolver.caltech.edu/CaltechAUTHORS:20160603-092405553

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Abstract

Field observations of new particle formation and the subsequent particle growth are typically only possible at a fixed measurement location, and hence do not follow the temporal evolution of an air parcel in a Lagrangian sense. Standard analysis for determining formation and growth rates requires that the time-dependent formation rate and growth rate of the particles are spatially invariant; air parcel advection means that the observed temporal evolution of the particle size distribution at a fixed measurement location may not represent the true evolution if there are spatial variations in the formation and growth rates. Here we present a zero-dimensional aerosol box model coupled with one-dimensional atmospheric flow to describe the impact of advection on the evolution of simulated new particle formation events. Wind speed, particle formation rates and growth rates are input parameters that can vary as a function of time and location, using wind speed to connect location to time. The output simulates measurements at a fixed location; formation and growth rates of the particle mode can then be calculated from the simulated observations at a stationary point for different scenarios and be compared with the ‘true’ input parameters. Hence, we can investigate how spatial variations in the formation and growth rates of new particles would appear in observations of particle number size distributions at a fixed measurement site. We show that the particle size distribution and growth rate at a fixed location is dependent on the formation and growth parameters upwind, even if local conditions do not vary. We also show that different input parameters used may result in very similar simulated measurements. Erroneous interpretation of observations in terms of particle formation and growth rates, and the time span and areal extent of new particle formation, is possible if the spatial effects are not accounted for.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3402/tellusb.v68.29706DOIArticle
http://www.tellusb.net/index.php/tellusb/article/view/29706PublisherArticle
Additional Information:© 2016 N. Kivekäs et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material for any purpose, even commercially, provided the original work is properly cited and states its license. Received: 10 September 2015; Accepted: 12 February 2016; Published: 11 April 2016. This work was supported by the Academy of Finland through The Centre of Excellence in Atmospheric Science - From Molecular and Biological processes to The Global Climate, the Nordic top-level research initiative CRAICC (Cryosphere-atmosphere interactions in a changing Arctic climate), and by the Maj and Tor Nessling Foundation. The study is also a contribution to the Lund University Strategic Research Areas: Modeling the Regional and Global Earth System (MERGE). J. Leppä would like to acknowledge the funding received from the Magnus Ehrnrooth Foundation, the Jane and Aatos Erkko Foundation and the Emil Aaltonen Foundation. P. Roldin would like to acknowledge the Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning FORMAS (Project No. 214-2014-1445).
Funders:
Funding AgencyGrant Number
Academy of FinlandUNSPECIFIED
Maj and Tor Nessling FoundationUNSPECIFIED
Magnus Ehrnrooth FoundationUNSPECIFIED
Jane and Aatos Erkko FoundationUNSPECIFIED
Emil Aaltonen FoundationUNSPECIFIED
Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning214-2014-1445
Record Number:CaltechAUTHORS:20160603-092405553
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160603-092405553
Official Citation:KIVEKÄS, Niku et al. Coupling an aerosol box model with one-dimensional flow: a tool for understanding observations of new particle formation events. Tellus B, [S.l.], v. 68, apr. 2016. ISSN 1600-0889. http://dx.doi.org/10.3402/tellusb.v68.29706
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67645
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:03 Jun 2016 18:51
Last Modified:03 Jun 2016 18:51

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