Sini Isokääntä

Sini Isokääntä
University of Eastern Finland | UEF · Department of Applied Physics

Master of Science

About

14
Publications
1,567
Reads
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42
Citations
Introduction
I am working as a doctoral researcher in the field of aerosol physics. I am currently investigating how aerosols change due to cloud processes and in other possible pathways involving water in the atmosphere. Recently I have been concentrating on comparing these water phase processes (clouds & precipitation) from observational and GCM data in the Lagrangian framework by using back trajectory analysis. I am part of WP2 in FORCeS (https://forces-project.eu/).
Additional affiliations
September 2019 - present
University of Eastern Finland
Position
  • Assistant
Description
  • Course assistant for the Statistical Physics - course
January 2019 - present
University of Eastern Finland
Position
  • PhD Student
Description
  • Junior researcher
June 2016 - December 2018
University of Eastern Finland
Position
  • Research Assistant
Education
June 2017 - December 2018
University of Eastern Finland
Field of study
  • Applied Physics, Aerosol Physics
January 2016 - June 2017
University of Eastern Finland
Field of study
  • Applied Physics

Publications

Publications (14)
Article
Tropospheric ozone (O3) concentrations are observed to increase with temperature in urban and rural locations. We investigated the apparent temperature dependency of daytime ozone concentration in the Finnish boreal forest in summertime based on long-term measurements. We used statistical mixed effects models to separate the direct effects of tempe...
Preprint
Full-text available
Dimethyl sulphide (DMS) is emitted by phytoplankton species in the oceans and constitutes the largest source of naturally emitted sulphur to the atmosphere. The climate impact of secondary particles, formed through the oxidation of DMS by hydroxyl radicals, is still elusive. This study investigates the hygroscopicity and cloud condensation nuclei a...
Preprint
Full-text available
Atmospheric aerosol particle concentrations are strongly affected by various wet processes, including wet scavenging (below and in-cloud) and aqueous phase oxidation in-cloud. This study employs airmass history analysis and observational data to investigate how wet scavenging and cloud processes affect particle concentrations and composition during...
Article
Full-text available
Aerosol particles cool the climate by scattering solar radiation and by acting as cloud condensation nuclei. Higher temperatures resulting from increased greenhouse gas levels have been suggested to lead to increased biogenic secondary organic aerosol and cloud condensation nuclei concentrations creating a negative climate feedback mechanism. Here,...
Article
Full-text available
Online analysis with mass spectrometers produces complex data sets, consisting of mass spectra with a large number of chemical compounds (ions). Statistical dimension reduction techniques (SDRTs) are able to condense complex data sets into a more compact form while preserving the information included in the original observations. The general princi...
Preprint
Full-text available
Abstract. Primary emissions of wood combustion are complex mixtures of hundreds or even over a thousand compounds, which pass through a series of chemical reactions and physical transformation processes in the atmosphere ( aging ). This aging process depends on atmospheric conditions, such as concentration of atmospheric oxidizing agents (OH radica...
Preprint
Full-text available
Abstract. Online analysis with mass spectrometers produces complex data sets, consisting of mass spectra with a large number of chemical compounds (ions). Statistical dimension reduction techniques (SDRTs) are able to condense complex data sets into a more compact form while preserving the information included in the original observations. The gene...
Article
Full-text available
Fitting a line to two measured variables is considered one of the simplest statistical procedures researchers can carry out. However, this simplicity is deceptive as the line-fitting procedure is actually quite a complex problem. Atmospheric measurement data never come without some measurement error. Too often, these errors are neglected when resea...
Article
Full-text available
Insect herbivory of plants leads to the increased emissions of highly reactive volatile organic compounds (VOCs). We measured above-ground VOC emissions of Scots pine (Pinus sylvestris) saplings in the laboratory using a proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) before, during and after a 48-hour exposure to bark-feedin...
Preprint
Full-text available
Fitting a line on a scatterplot of two measured variables is considered as one of the simplest statistical procedures researchers can do. However, this simplicity is deceptive as the line fitting procedure is actually quite a complex problem. Atmospheric measurement data never comes without some measurement error. Too often, these errors are neglec...

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