Measurement report: Introduction to the HyICE-2018 campaign for measurements of ice nucleating particles in the Hyytiälä boreal forest

Brasseur, Zoé; Castarède, Dimitri; Thomson, Erik S.; Adams, Michael P.; Dusseldorp, Saskia Drossaart van; Heikkilä, Paavo; Korhonen, Kimmo; Lampilahti, Janne; Paramonov, Mikhail; Schneider, J.; Vogel, Franziska; Wu, Yusheng; Abbat, Jonathan P. D.; Atanasova, Nina S.; Bamford, Dennis H.; Bertozzi, Barbara; Boyer, Matthew; Brus, David; Daily, Martin; Fösig, Romy; Gute, Ellen; Harrison, Alexander D.; Hietala, Paula; Höhler, Kristina; Kanji, Zamin A.; Keskinen, J.; Lacher, Larissa; Lampimäki, Markus; Levula, Janne; Manninen, Antti; Nadolny, Jens; Peltola, Maija; Porter, Grace C. E.; Poutanen, Pyry; Proske, Ulrike; Schorr, Tobias; Umo, Nsikanabasi Silas; Stenszky, János; Virtanen, Annele; Moisseev, Dmitri; Kulmala, Markku; Murray, Benjamin J.; Petäj̈ä, Tuukka; Möhler, Ottmar; Duplissy, Jonathan

doi:10.5194/acp-2021-744

Cited by 2 publications

(1 citation statement)

References 65 publications

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“…The presented data were collected during an airborne measurement campaign in spring 2017 on six intensive measurement days between 2 and 16 May above the boreal forest at the Station for Measuring Ecosystem Atmospheric Relations (SMEAR) II, located in Hyytiälä, southern Finland (Hari and Kulmala, 2005;Brasseur et al, 2021). In addition, continuous ground-based data from SMEAR II were included in this study, such as aerosol precursor gases and ions, particle size distributions, meteorological data and Doppler lidar (section 2.4).…”

Section: Methodsmentioning

confidence: 99%

Diurnal evolution of negative atmospheric ions above the boreal forest: From ground level to the free troposphere

Beck

Schobesberger

Junninen

et al. 2021

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Abstract. At SMEAR II research station in Hyytiälä, located in the Finnish boreal forest, the process of new particle formation and the role of ions has been investigated for almost 20 years near the ground and at canopy level. However, above SMEAR II, the vertical distribution and diurnal variation of these different atmospheric ions are poorly characterized. In this study, we assess the atmospheric ion composition in the stable boundary layer, residual layer, mixing layer and free troposphere, and the 5 evolution of these atmospheric ions due to photochemistry and turbulent mixing through the day. To measure the vertical profile of atmospheric ions, we developed a tailored setup for online mass spectrometric measurements, capable of being deployed in a Cessna 172 with minimal modifications. Simultaneously, instruments dedicated to aerosol properties measured in a second Cessna. We conducted a total of 16 measurement flights in May 2017, during the spring, which is the most active new particle formation season. A flight day typically consisted of three distinct flights through the day (dawn, morning and afternoon) to 10 observe the diurnal variation and at different altitudes (from 100 m to 3200 m above ground), and to capture the boundary layer development from stable boundary layer, residual layer to mixing layer, and the free troposphere. Our observations showed that the ion composition is distinctly different in each layer and depends on the air mass origin and time of the day. Before sunrise, the layers are separated from each other and have their own ion chemistry. We observed that the ions present within the stable layer are of the same composition as the ions measured at the canopy level. During daytime when the mixing layer evolved and the compounds are vertically mixed, we observed that highly oxidised organic molecules are distributed to the top of the boundary layer. The ion composition in the residual layer varies with each day, showing similarities with either the stable boundary layer or the free troposphere. Finally, within the free troposphere, we detected a variety of carboxylic acids and ions that are likely containing halogens, originating from the Arctic Sea.

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Section: Methodsmentioning

confidence: 99%

Diurnal evolution of negative atmospheric ions above the boreal forest: From ground level to the free troposphere

Beck

Schobesberger

Junninen

et al. 2021

Preprint

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Measurement report: Introduction to the HyICE-2018 campaign for measurements of ice-nucleating particles and instrument inter-comparison in the Hyytiälä boreal forest

et al. 2022

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Abstract. The formation of ice particles in Earth's atmosphere strongly influences the dynamics and optical properties of clouds and their impacts on the climate system. Ice formation in clouds is often triggered heterogeneously by ice-nucleating particles (INPs) that represent a very low number of particles in the atmosphere. To date, many sources of INPs, such as mineral and soil dust, have been investigated and identified in the low and mid latitudes. Although less is known about the sources of ice nucleation at high latitudes, efforts have been made to identify the sources of INPs in the Arctic and boreal environments. In this study, we investigate the INP emission potential from high-latitude boreal forests in the mixed-phase cloud regime. We introduce the HyICE-2018 measurement campaign conducted in the boreal forest of Hyytiälä, Finland, between February and June 2018. The campaign utilized the infrastructure of the Station for Measuring Ecosystem-Atmosphere Relations (SMEAR) II, with additional INP instruments, including the Portable Ice Nucleation Chamber I and II (PINC and PINCii), the SPectrometer for Ice Nuclei (SPIN), the Portable Ice Nucleation Experiment (PINE), the Ice Nucleation SpEctrometer of the Karlsruhe Institute of Technology (INSEKT) and the Microlitre Nucleation by Immersed Particle Instrument (µL-NIPI), used to quantify the INP concentrations and sources in the boreal environment. In this contribution, we describe the measurement infrastructure and operating procedures during HyICE-2018, and we report results from specific time periods where INP instruments were run in parallel for inter-comparison purposes. Our results show that the suite of instruments deployed during HyICE-2018 reports consistent results and therefore lays the foundation for forthcoming results to be considered holistically. In addition, we compare measured INP concentrations to INP parameterizations, and we observe good agreement with the Tobo et al. (2013) parameterization developed from measurements conducted in a ponderosa pine forest ecosystem in Colorado, USA.

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Measurement report: Introduction to the HyICE-2018 campaign for measurements of ice nucleating particles in the Hyytiälä boreal forest

Cited by 2 publications

References 65 publications

Diurnal evolution of negative atmospheric ions above the boreal forest: From ground level to the free troposphere

Diurnal evolution of negative atmospheric ions above the boreal forest: From ground level to the free troposphere

Measurement report: Introduction to the HyICE-2018 campaign for measurements of ice-nucleating particles and instrument inter-comparison in the Hyytiälä boreal forest

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