A5024547450- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Cryospheric studies and observations
- Air Quality and Health Impacts
- Polar Research and Ecology
- Meteorological Phenomena and Simulations
- Radioactive contamination and transfer
- Marine and coastal ecosystems
- Radioactivity and Radon Measurements
- Fire effects on ecosystems
- Aeolian processes and effects
- Fire dynamics and safety research
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Arctic and Antarctic ice dynamics
- Nuclear and radioactivity studies
- Laser-induced spectroscopy and plasma
- Planetary Science and Exploration
- Graphite, nuclear technology, radiation studies
- Plant responses to elevated CO2
- Air Quality Monitoring and Forecasting
Finnish Meteorological Institute
2009-2020
German Meteorological Service
2006
Large sets of filtered actinometer, pyrheliometer and Sun photometer measurements have been carried out over the past 30 years by various groups at different Arctic Antarctic sites for time periods. They were examined to estimate ensemble average, long‐term trends summer background aerosol optical depth AOD(500 nm) in polar regions (omitting data influenced haze volcanic eruptions). The trend was estimated be between −1.6% −2.0% per year years, depending on location. No significant observed...
During a 33‐month measurement period at high‐latitude background site in northern Finland, total of 103 new particle formation events were observed. In 19 cases, movement the air masses allowed observation and growth over sufficiently long time to investigate production “potential” cloud condensation nuclei (CCN) resulting from new‐particle formation. All CCN took place relatively clean that had traversed Northern Atlantic/Arctic Ocean prior arrival our site. The number formed new, varied...
Abstract This study determined measured and Mie-calculated angular signal truncations for total backscatter TSI, Inc., nephelometers, as a function of wavelength particles known size composition. Except the scattering channels, similar agreements in previous calculated were derived submicrometer test aerosols. For first time, instrument responses also supermicrometer aerosols up to 1.9 μm geometric mean diameter. These data confirm theoretical predictions strong scatter signals integrating...
Abstract. The Finnish Meteorological Institute, in collaboration with the University of Helsinki, has established a new ground-based remote-sensing network Finland. consists five topographically, ecologically and climatically different sites distributed from southern to northern main goal is monitor air pollution boundary layer properties near real time, Doppler lidar ceilometer at each site. In addition these operational tasks, two are members Aerosols, Clouds Trace gases Research...
Abstract. We have measured spectral albedo, as well ancillary parameters, of seasonal European Arctic snow at Sodankylä, Finland (67°22' N, 26°39' E). The springtime intensive melt period was observed during the Snow Reflectance Transition Experiment (SNORTEX) in April 2009. upwelling and downwelling irradiance, 290–550 nm with a double monochromator spectroradiometer, revealed albedo values ~0.5–0.7 for ultraviolet visible range, both under clear sky variable cloudiness. During most...
Aerosol particle optical properties were measured continuously between years 2013–2015 at the Marambio station in Antarctic Peninsula. Annual cycles of scattering and absorption studied explained using chemical composition analysis air mass transport patterns. The was found elevated during winter but did not show any clear annual cycle. aerosol single albedo λ = 637 nm on average 0.96 ± 0.10, with a median 0.99. Ångström exponent increased summer, indicating an increasing fraction fine mode...
Abstract. Aerosol Optical Depth (AOD) and Ångström exponent (AE) values derived with the MODIS retrieval algorithm over land (Collection 5) are compared ground based sun photometer measurements at eleven sites spanning globe. Although, in general, total AOD compares well these (R2 generally 0.8), there cases (from 2 to 67% of depending on site) where clearly retrieves wrong spectral dependence, hence, an unrealistic AE value. Some poor retrievals due aerosol signal being too small (total...
Abstract. In March 2017, measurements of downward global irradiance ultraviolet (UV) radiation were started with a multichannel GUV-2511 radiometer in Marambio, Antarctica (64.23∘ S; 56.62∘ W), by the Finnish Meteorological Institute (FMI) collaboration Servicio Meteorológico Nacional (SMN). These analysed and results compared to previous performed at same site Antarctic NILU-UV network during 2000–2008 data from five stations across Antarctica. 2017/2018 monthly-average erythemal daily...
Abstract. Ambient aerosol particles can take up water and thus change their optical properties depending on the hygroscopicity relative humidity (RH) of surrounding air. Knowledge effect is crucial importance for radiative forcing calculations also needed comparison or validation remote sensing model results with in situ measurements. Specifically, particle light scattering depends RH be described by enhancement factor f(RH), which defined as coefficient at divided its dry value (RH...
Abstract. A prescribed fire experiment was conducted on 26 June 2009 in Hyytiälä, Finland, to study aerosol and trace gas emissions from fires of slash fuels the effects soil properties a controlled environment. 0.8 ha forest near SMEAR II measurement station (Station for Measuring Ecosystem-Atmosphere Relations) cut clear; some tree trunks, all tops branches were left ground burned. The amount burned organic material ~46.8 tons (i.e., ~60 ha−1). flaming phase lasted 2 h 15 min, smoldering 3...
Abstract. Three years of continuous measurements aerosol optical properties and simultaneous number size distribution at Pallas GAW station, a remote subarctic site in the northern border boreal forest zone, have been analysed. The scattering coefficient 550 nm varied from 0.2 to 94.4 Mm−1 with an average 7.1±8.6 Mm−1. Both backscattering coefficients had clear seasonal cycle autumn minimum 4–5 times higher summer maximum. was dominated by submicron aerosols especially so during late autumn....
Abstract. In spring 2006 a special meteorological situation occurred in the European Arctic region giving record high levels of air pollution. The synoptic resulted extensive transport pollution predominantly from agricultural fires Eastern Europe into and air-pollution were measured at Zeppelin observatory Ny-Ålesund (78°54' N, 11°53' E) period 25 April to 12 May. present study we investigate optical properties aerosols this extreme event estimate radiative forcing episode. We examine...
By using a screened set of long‐term aerosol measurement data, the contribution natural boreal forest aerosols to direct radiative effect (DRE) was observed at remote continental site in northern Finland. Averaged over summer season, magnitude this top atmosphere estimated be range −(0.37–0.74) W m −2 our study region and possibly somewhat higher whole region. Globally, DRE owing is much smaller than that sea salt or dust aerosols, as well forcing by anthropogenic aerosols. We also updated...
A smoke plume originating from the massive wildfires near Moscow was clearly detected in northern Finland on 30 July 2010. Measurements made with remote sensing instruments demonstrated how biomass burning aerosols affected chemical and optical characteristics of atmosphere regions hundreds kilometers away actual fires. In this study, we used MODIS, AIRS, CALIOP, PFR, ceilometers, FTS Brewer data to quantify properties transported plume. addition, situ measurements aerosol concentration...
In this paper, we pose the question where source regions of aerosol, which occurs in European Arctic, are located. Long-term aerosol optical depth (AOD) data from Ny-Ålesund and Sodankylä as well short-term a campaign on Russian drifting station were analysed by air backtrajectories, analysis general circulation pattern correlation to chemical composition in-situ measurements. Surprisingly, our clearly shows that direct transport pollutants Europe does not play an important role. Instead,...
We used more than five years of continuous aerosol measurements to estimate the direct radiative feedback parameter associated with formation biogenic secondary organic (BSOA) at a remote continental site edge boreal forest zone in Northern Finland. Our upper-limit for this during summer period (ambient temperatures above 10 °C) was −97 ± 66 mW m−2 K−1 (mean STD) when using optical depth (fAOD) and −63 40 'dry' scattering coefficient ground level (fσ). Here STD represents variability f...
Abstract. A ground-based ultraviolet (GUV) multi-filter radiometer was set up at Marambio, 64∘ S, 56∘ W, Antarctica, in 2017. The instrument continuously measures (UV) radiation, visible (VIS) radiation and photosynthetically active (PAR). measurements are designed for providing high-quality long-term time series that can be used to assess the impact of global climate change Antarctic region. quality assurance includes regular absolute calibrations solar comparisons performed Marambio...
Large discrepancies are observed between snow albedo in Numerical Weather Prediction (NWP) models and from satellite observations the case of high vegetation. Knowledge Bidirectional Reflectance Distribution Function (BRDF) snow-forest system is required to solve problem. The 3-years SNORTEX (Snow Transition Experiment) campaign acquires 2008 situ measurements forest properties support development modelling tools validate coarse resolution products (POLDER, MODIS, MERIS, METOP). measurement...
Abstract. In spring 2006 a special meteorological situation occurred in the European Arctic region giving record high levels of air pollution. The synoptic resulted extensive transport pollution predominantly from agricultural fires Eastern Europe into and air-pollution were measured at Zeppelin observatory Ny-Ålesund (78°54' N, 11°53' E) period 25 April to 12 May. present study we investigate optical properties aerosols this extreme event estimate radiative forcing episode. We examine...
Abstract. Ambient aerosol particles can take up water and thus change their optical properties depending on the hygroscopicity relative humidity (RH) of surrounding air. Knowledge effect is crucial importance for radiative forcing calculations also needed comparison or validation remote sensing model results with in-situ measurements. Specifically, particle light scattering depends RH be described by enhancement factor f(RH), which defined as coefficient at divided its dry value (RH...