Exploring non-linear associations between atmospheric new-particle formation and ambient variables : a mutual information approach

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http://hdl.handle.net/10138/277449

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Zaidan , M A , Haapasilta , V , Relan , R , Paasonen , P , Kerminen , V-M , Junninen , H , Kulmala , M & Foster , A S 2018 , ' Exploring non-linear associations between atmospheric new-particle formation and ambient variables : a mutual information approach ' , Atmospheric Chemistry and Physics , vol. 18 , no. 17 , pp. 12699-12714 . https://doi.org/10.5194/acp-18-12699-2018

Title: Exploring non-linear associations between atmospheric new-particle formation and ambient variables : a mutual information approach
Author: Zaidan, Martha A.; Haapasilta, Ville; Relan, Rishi; Paasonen, Pauli; Kerminen, Veli-Matti; Junninen, Heikki; Kulmala, Markku; Foster, Adam S.
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Aerosol-Cloud-Climate -Interactions (ACCI)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-09-03
Language: eng
Number of pages: 16
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/277449
Abstract: Atmospheric new-particle formation (NPF) is a very non-linear process that includes atmospheric chemistry of precursors and clustering physics as well as subsequent growth before NPF can be observed. Thanks to ongoing efforts, now there exists a tremendous amount of atmospheric data, obtained through continuous measurements directly from the atmosphere. This fact makes the analysis by human brains difficult but, on the other hand, enables the usage of modern data science techniques. Here, we calculate and explore the mutual information (MI) between observed NPF events (measured at Hyytiala, Finland) and a wide variety of simultaneously monitored ambient variables: trace gas and aerosol particle concentrations, meteorology, radiation and a few derived quantities. The purpose of the investigations is to identify key factors contributing to the NPF. The applied mutual information method finds that the formation events are strongly linked to sulfuric acid concentration and water content, ultraviolet radiation, condensation sink (CS) and temperature. Previously, these quantities have been well-established to be important players in the phenomenon via dedicated field, laboratory and theoretical research. The novelty of this work is to demonstrate that the same results are now obtained by a data analysis method which operates without supervision and without the need of understanding the physics deeply. This suggests that the method is suitable to be implemented widely in the atmospheric field to discover other interesting phenomena and their relevant variables.
Subject: CONTINENTAL BOUNDARY-LAYER
CLOUD CONDENSATION NUCLEI
AEROSOL-SIZE DISTRIBUTION
YANGTZE-RIVER DELTA
SULFURIC-ACID
FORMATION EVENTS
BOREAL-FOREST
NUMBER CONCENTRATION
NUCLEATION EVENTS
ORGANIC AEROSOL
1172 Environmental sciences
114 Physical sciences
116 Chemical sciences
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