People

We work in the atmospheric aerosols group.
Katrianne Lehtipalo

Professor, group leader

I'm professor of atmospheric science & physics at INAR and Finnish Meteorological Institute. I'm also Director of the Doctoral program in Atmospheric Sciences. My expertise is in aerosol physics and I have wide experience with field and laboratory experiments on atmospheric aerosols and nanoparticle measurement techniques. I'm interested in processes altering the atmospheric aerosol and ion population, such as aerosol formation and growth. The main projects I'm involved in are ACTRIS and CLOUD.

Home page and publications

Contact: katrianne.lehtipalo(a)helsinki.fi

Twitter: @Katrianne_L

Rima Baalbaki

Doctoral researcher

I am interested in understanding the mechanisms of atmospheric new particle formation in different environments, mainly in the Eastern Mediterranean and Middle East region. My research work involves laboratory experiments, field measurements and data analysis. I dislike working with ‘black boxes’ and I enjoy learning about the internal workings of instruments and other research tools. 

Home page and publications

Contact: rima.baalbaki(a)helsinki.fi

Twitter: @BaalbakiRima

Sujai Banerji

Doctoral researcher

I am interested in the optical properties of aerosol particles, especially black and brown carbon, to calculate some of the input parameters that are required for better regional and global climate projections.

Contact: sujai.banerji(a)helsinki.fi

Home page and publications

Zoe Brasseur

Doctoral researcher

I am a PhD student working on atmospheric ice nucleation. My main research topic is heterogeneous ice nucleation and the interactions between atmospheric aerosols and clouds. I am interested in boreal and polar environments and I am using data from field and laboratory experiments. 

Home page and publications

Contact: zoe.brasseur(a)helsinki.fi

Twitter: @ZoeBrasseur

Juan Andrés Casquero Vera

Post doctoral researcher

I am a postdoctoral researcher with the main interest in atmospheric aerosols and air quality. My expertise is in aerosol physics and, as an experimentalist, I have a broad experience with different instrumentation (mainly in-situ) and has participated in several field campaigns and laboratory experiments. I am interesting in the process of New Particle Formation, its interaction with mineral dust and the impact of this process/interaction on cloud formation and climate.

Contact: juan.casquero(a)helsinki.fi

Twitter: @jacasquero

Liangduo Chen

Doctoral researcher (visiting)

I’m a visiting PhD student from Nanjing University, China. I’m interested in particle size distribution and new particle formation in polluted urban environment. I have done field measurement on the Qinghai-Tibet Plateau and participated in experiments using tethered airship.

Contact: liangduo.chen(a)smail.nju.edu.cn

Jonathan Duplissy

University researcher, docent

Home page and publications

Contact: jonathan.duplissy(a)helsinki.fi

Twitter: @JonathanInFinl

Janne Lampilahti

Post doctoral researcher

Expertise: ion spectrometers, airborne measurements. I'm currently working in the RI-Urbans project.

Home page and publications

Contact: janne.lampilahti(a)helsinki.fi

Markus Lampimäki

Post doctoral researcher

I am a postdoctoral researcher with interests in ion spectroscopic measurements, experimental lab work on nanoparticles as well as field measurements at different locations.

Home page and publications

Contact: markus.lampimaki(a)helsinki.fi

Magdalena Okuljar

Doctoral researcher

I am a doctoral researcher studying air quality in Helsinki. My work also includes studying New Particle Formation in the rural environments, especially Qvidja, Finland.

Home page and publications

Contact: magdalena.okuljar(a)helsinki.fi

Birte Rörup

Doctoral researcher

I am a PhD student working with chamber simulations in the CLOUD chamber at CERN, where I look at new particle formation under different atmospheric conditions. Mainly, I am interested in iodine nucleation in marine environments.

Home page and publications

Contact: birte.rörup(a)helsinki.fi

Juha Sulo

Doctoral researcher

I am a PhD student focusing on new particle formation in the atmosphere and time series analysis. I mainly work with sub-3nm particle size distributions and related long data sets in my work, in addition to which I monitor and maintain our long-term Particle Size Magnifier measurements at our SMEAR stations.

Home page and publications

Contact: juha.sulo(a)helsinki.fi

Christina Williamson

Research professor (tenure track)

I am tenure track research professor of aerosol and cloud processes at the Finnish Meteorological Institute and INAR. My work focuses on using in-situ observations to reduce aerosol radiative forcing uncertainty in global scale models. My background includes airborne and chamber observations, while my current modelling work focuses on EC-Earth.

Home page and publications

Contact: christina.williamson(a)fmi.fi

Yusheng Wu

Doctoral researcher

I am interested in instrument development for on-line field measurement and implementing machine learning algorithms in atmospheric problems. 

Home page and publications

Contact: yusheng.wu(a)helsinki.fi

Wenjuan Yu

Doctoral researcher

I am a CLOUD-DOC student at INAR. I conduct my research at the Cosmics Leaving Outdoor Droplets (CLOUD) chamber at CERN, Geneva and compare the experimental results with atmospheric observations.

Home page and publications

Contact: wenjuan.yu(a)helsinki.fi

Associated scientists

Prof. Tuukka Petäjä - Head of SMEAR II station, ACTRIS

University researcher Pasi Aalto - Atmospheric aerosol instrumentation, data management

Staff scientist Lauri Ahonen - Aerosol measurements at SMEAR II station in Hyytiälä

Previous members

PhD Dominik Stolzenburg

PhD Krista Luoma

PhD Jenni Kontkanen

PhD Robert Wagner

PhD Daniela Wimmer

PhD Katri Leino

PhD Riikka Väänänen

PhD Juan Hong

PhD Alessandro Franchin

PhD John Backman

PhD Ville Vakkari

PhD Juha Kangasluoma

PhD Hanna Manninen