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View article: Effect of future forest management on carbon and energy budgets in pine forests on mineral soil in southern Finland
Effect of future forest management on carbon and energy budgets in pine forests on mineral soil in southern Finland Open
In forest management, carbon sequestration is often the main topic of interest when it comes to climate change mitigation. Here, we examined other climate impacts of forests – caused by changes in albedo, latent heat flux and sensible heat…
View article: Supplementary material to "Effect of future forest management on carbon and energy budgets in pine forests on mineral soil in southern Finland"
Supplementary material to "Effect of future forest management on carbon and energy budgets in pine forests on mineral soil in southern Finland" Open
View article: Environmental drivers constraining the seasonal variability in satellite-observed and modelled methane at northern high latitudes
Environmental drivers constraining the seasonal variability in satellite-observed and modelled methane at northern high latitudes Open
Methane emissions from Northern Hemisphere high-latitude wetlands are associated with large uncertainties, especially in the rapidly warming climate. Satellite observations of column-averaged methane concentrations (XCH4) in the atmosphere…
View article: Supplementary material to "Uncertainty and retrieval sensitivity in TROPOMI-based methane inversions over the North Slope of Alaska"
Supplementary material to "Uncertainty and retrieval sensitivity in TROPOMI-based methane inversions over the North Slope of Alaska" Open
View article: Uncertainty and retrieval sensitivity in TROPOMI-based methane inversions over the North Slope of Alaska
Uncertainty and retrieval sensitivity in TROPOMI-based methane inversions over the North Slope of Alaska Open
The Arctic is experiencing unprecedented environmental changes with rapidly rising temperatures. Emissions of methane (CH4) – a potent greenhouse gas – may be increasing from the region, making accurate monitoring essential. The TROPOspher…
View article: Spring melting season methane emissions in northern high latitude wetlands are governed by the length of the season and presence of permafrost
Spring melting season methane emissions in northern high latitude wetlands are governed by the length of the season and presence of permafrost Open
Northern high latitude wetlands are significant sources of methane, with emissions driven by seasonal soil freezing and thawing. To better understand the seasonality of northern high latitude methane emissions, we defined the spring meltin…
View article: Global CH <sub>4</sub> fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH <sub>4</sub> atmospheric inverse model
Global CH <sub>4</sub> fluxes derived from JAXA/GOSAT lower-tropospheric partial column data and the CarbonTracker Europe-CH <sub>4</sub> atmospheric inverse model Open
Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the pote…
View article: Long-term observations of atmospheric CO <sub>2</sub> and CH <sub>4</sub> trends and comparison of two measurement systems at Pallas-Sammaltunturi station in Northern Finland
Long-term observations of atmospheric CO <sub>2</sub> and CH <sub>4</sub> trends and comparison of two measurement systems at Pallas-Sammaltunturi station in Northern Finland Open
Accurate and precise observations of atmospheric greenhouse gas mole fractions are crucial for understanding the carbon cycle. However, challenges can arise when comparing data between different observation sites owing to the different mea…
View article: An inter-comparison of inverse models for estimating European CH <sub>4</sub> emissions
An inter-comparison of inverse models for estimating European CH <sub>4</sub> emissions Open
Atmospheric inversions are widely used to evaluate and improve inventories of methane (CH4) emissions on scales ranging from global to national and beyond, combining observations with atmospheric transport models. This study uses the dense…
View article: 30 years of measurements at SMEAR II station – practical work at a field station and how it has changed during decades
30 years of measurements at SMEAR II station – practical work at a field station and how it has changed during decades Open
University field sites have long been important places for research and education. SMEAR II (Station for Measuring Earth surface - Atmosphere Relations) by INAR (Institute for Atmospheric and Earth System Research, University of Helsinki) …
View article: Environmental impacts of peat extraction site rewetting – Establishing of new intensive monitoring site
Environmental impacts of peat extraction site rewetting – Establishing of new intensive monitoring site Open
Peat extraction and use of peat resources for energy purposes are ending in Finland as part of societal green transition and energy production shift. Former peat extraction areas are often restored by rewetting, but short- and long-term im…
View article: Assessing modelled methane emissions over northern wetlands by the JULES-HIMMELI model
Assessing modelled methane emissions over northern wetlands by the JULES-HIMMELI model Open
Northern wetlands are considered to be one of the most significant natural sources of methane (CH4) emissions. The default wetland CH4 emission scheme in JULES, a current state-of-art land surface model, only takes in…
View article: Partitioning anthropogenic and natural methane emissions in Finland during 2000–2021 by combining bottom-up and top-down estimates
Partitioning anthropogenic and natural methane emissions in Finland during 2000–2021 by combining bottom-up and top-down estimates Open
Accurate national methane (CH4) emission estimates are essential for tracking progress towards climate goals. This study investigated Finnish CH4 emissions from 2000–2021 using bottom-up and top-down approaches. We evaluated the ability of…
View article: Global CH <sub>4</sub> Fluxes Derived from JAXA/GOSAT Lower Tropospheric Partial Column Data and the CTE-CH <sub>4</sub> Atmospheric Inverse Model
Global CH <sub>4</sub> Fluxes Derived from JAXA/GOSAT Lower Tropospheric Partial Column Data and the CTE-CH <sub>4</sub> Atmospheric Inverse Model Open
Satellite-driven inversions provide valuable information about methane (CH4) fluxes, but the assimilation of total column-averaged dry-air mole fractions of CH4 (XCH4) has been challenging. This study explores, for the first time, the pote…
View article: Environmental drivers constraining the seasonal variability of satellite-observed methane at Northern high latitudes
Environmental drivers constraining the seasonal variability of satellite-observed methane at Northern high latitudes Open
Methane emissions from Northern high-latitude wetlands are associated with large uncertainties, especially in the rapidly warming climate. Satellite observations of column-averaged methane concentrations (XCH4) in the atmosphere exhibit va…
View article: Air temperature and precipitation constraining the modelled wetland methane emissions in a boreal region in northern Europe
Air temperature and precipitation constraining the modelled wetland methane emissions in a boreal region in northern Europe Open
Wetland methane responses to temperature and precipitation are studied in a boreal wetland-rich region in northern Europe using ecosystem process models. Six ecosystem models (JSBACH-HIMMELI, LPX-Bern, LPJ-GUESS, JULES, CLM4.5, and CLM5) a…
View article: Long-term observations of atmospheric CO <sub>2</sub> and CH <sub>4</sub> trends and comparison of two measurement systems at Pallas-Sammaltunturi station in Northern Finland
Long-term observations of atmospheric CO <sub>2</sub> and CH <sub>4</sub> trends and comparison of two measurement systems at Pallas-Sammaltunturi station in Northern Finland Open
Accurate and precise observations of atmospheric greenhouse gas mixing ratios are crucial for understanding the carbon cycle. However, challenges can arise when comparing data between different observation sites, due to different measureme…
View article: Future methane fluxes of peatlands are controlled by management practices and fluctuations in hydrological conditions due to climatic variability
Future methane fluxes of peatlands are controlled by management practices and fluctuations in hydrological conditions due to climatic variability Open
Peatland management practices, such as drainage and restoration, have a strong effect on boreal peatland methane (CH4) fluxes. Furthermore, CH4 fluxes are strongly controlled by local environmental conditions, such as soil hydrology, tempe…
View article: Parametrization of a biochemical CO2 exchange model for birch (Betula pendula Roth.)
Parametrization of a biochemical CO2 exchange model for birch (Betula pendula Roth.) Open
Gas exchange of one-year-old silver birch (Betula pendula Roth.) seedlings of boreal habitat was studied in laboratory conditions. Seedlings were exposed to stepwise changes in CO2 concentration and irradiance in five constant temperatures…
View article: Aerosols in boreal forest: wintertime relations between formation events and bio-geo-chemical activity
Aerosols in boreal forest: wintertime relations between formation events and bio-geo-chemical activity Open
We studied wintertime aerosol formation and subsequent particle growth events that have been frequently observed in ambient air at a boreal forest site (SMEAR II station) in southern Finland. Aerosol size distributions, gas concentrations,…
View article: Consistent estimates of gross primary production of Finnish forests : comparison of estimates of two process models
Consistent estimates of gross primary production of Finnish forests : comparison of estimates of two process models Open
We simulated Gross Primary Production (GPP) of Finnish forests using a landsurface model (LSM), JSBACH, and a semi-empirical stand-flux model PRELES, and compared their predictions with the MODIS GPP product. JSBACH used information about …
View article: From dispersed practices to radical socio-technical imaginaries: the role of action labs for supporting collective energy citizenship
From dispersed practices to radical socio-technical imaginaries: the role of action labs for supporting collective energy citizenship Open
How to engage diverse groups of people in the energy transition in Europe is a pressing issue, one that requires grappling with the role of collectivities and social change dynamics. Based on the results of multi-form Citizen Action Labs (…
View article: Hydrogen soil deposition in northern boreal zone
Hydrogen soil deposition in northern boreal zone Open
View article: Physico-chemical characterization and mass closure of size-segregated atmospheric aerosols in Hyytiälä, Finland
Physico-chemical characterization and mass closure of size-segregated atmospheric aerosols in Hyytiälä, Finland Open
A size-segregated chemical composition of atmospheric aerosols was investigated in May 2004 at the SMEAR II station, southern Finland. Aerosols were collected using two 12-stage low pressure impactors (SDI) and two virtual impactors (VI). …
View article: Patterns in airborne pollen and other primary biological aerosol particles (PBAP), and their contribution to aerosol mass and number in a boreal forest
Patterns in airborne pollen and other primary biological aerosol particles (PBAP), and their contribution to aerosol mass and number in a boreal forest Open
We studied variation in concentrations of airborne pollen and other particles of biological origin in a boreal forest in Finland during 2003–2004. The highest concentrations of pollen were observed in late spring and early summer, whereas …
View article: Influence of air mass source sector on variations in CO2 mixing ratio at a boreal site in northern Finland
Influence of air mass source sector on variations in CO2 mixing ratio at a boreal site in northern Finland Open
CO2 mixing ratio in air masses coming from different source sectors was studied at Pallas measurement station in Lapland. Source sectors were defined using back trajectories and wind direction measurements. Air masses from the North and We…
View article: Characteristics of new particle formation events and cluster ions at K-puszta, Hungary
Characteristics of new particle formation events and cluster ions at K-puszta, Hungary Open
Atmospheric new particle formation events were analyzed based on particle size distributions measured with a Differential Mobility Particle Sizer (DMPS) and an Air Ion Spectrometer (AIS) during the BIOSOL (Formation mechanisms, marker comp…
View article: Measurements of humidified particle number size distributions in a Finnish boreal forest : derivation of hygroscopic particle growth factors
Measurements of humidified particle number size distributions in a Finnish boreal forest : derivation of hygroscopic particle growth factors Open
View article: Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook
Finnish Centre of Excellence in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change : summary and outlook Open
markku Kulmala1)*, hanna K. lappalainen1)2), Jaana Back1)3), ari laaksonen2)4), eero nikinmaa3), marja-liisa riekkola5), timo vesala1), Yrjo viisanen2), tuula aalto2), michael Boy1), miikka Dal maso6), mikael ehn1), hannele hakola2), Pertt…
View article: Road-side measurements of aerosol and ion number size distributions : a comparison with remote site measurements
Road-side measurements of aerosol and ion number size distributions : a comparison with remote site measurements Open
We measured the number concentrations and size distributions of aerosol particles and air ions with a differential mobility particle sizer and air ion spectrometer, respectively, during a roadside campaign conducted in Kuopio (Savilahti), …