Publications and Science News

Matias Takala defended his doctoral thesis successfully

The public debate of climate change is often concentrated on the rise of the average temperature of Earth. Lately also the diminishing glaciers and sea ice on polar regions have gained attention. Snow is an equally important phenomenon of the cryosphere that has not yet gained as much weight as it should. Research scientist Matias […]

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A new method for monitoring soil frost/thaw state using a radar satellite

A new method for monitoring soil frost/thaw state in boreal forest environments was developed. The method enables nearly daily monitoring in a 1 km spatial resolution. The study investigated how the European Sentinel-1 synthetic aperture radar satellite can be used for the estimation of soil frost/thaw (F/T) state in the boreal forest zone. The method […]

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Improved uncertainty characterization for satellite-based mapping of Earth’s snow cover

A recent study of the FMI and the Finnish Environment Institute (SYKE) introduced an approach to characterize uncertainty in the mapping of snow extent from optical satellite images. The implementation of the developed method can enhance flood prevention and the optimization of hydro-power production. A typical bottleneck in the utilization of the satellite-based information is […]

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Solution to light scattering by absorbing particles revealed that ice crystals are more reflecting in the near infrared

Light propagation in absorbing particles has been calculated incorrectly for decades, a new FMI-SPACE –led study finds. The researchers derived a ray-tracing solution for scattering by absorbing particles. With this, they discovered that ice crystals reflect more near-infrared radiation than previously estimated. The result has direct applications in atmospheric remote sensing. Atmospheric particles scatter radiation […]

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Air quality observations made by satellite for nearly 14 years

The Dutch-Finnish Ozone Monitoring Instrument, OMI, has produced reliable information on matters such as air quality, air pollution emissions, and their movements, and has revealed previously unknown sources of emissions. OMI has made observations on air pollutants for nearly 14 years.  OMI measurements have been shown to be very reliable and they have opened new […]

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Gentle winds blow during the descent of most Mars landers

Gentle winds blow during the descent of most Mars landers High resolution images of jettisoned lander hardware acquired by Mars Reconnaissance Orbiter and Mars Global Surveyor at various landing sites on Mars have been analysed to measure winds in the Martian atmosphere. A computer model was used to reconstruct the trajectory of the lander, parachutes […]

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Deposition of different light-absorbing impurities in the snow of the Indian Himalayas and the Finnish Arctic

Snow samples were collected from glaciers in India and the seasonal snowpack of the Finnish Arctic. Snow samples have been measured for their elemental carbon (used as a proxy for black carbon) and mineral dust content in order to estimate their impact on snow reflectance. For the Himalayan samples, high concentrations of mineral dust were […]

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Earth Observation methods for soil moisture retrieval work better than generally anticipated

In-depth, spatially distributed evaluation of the ESA CCI Soil Moisture product over a typical Northern boreal forest/taiga environment was conducted in the surroundings of the FMI Sodankylä Arctic Space Centre. For the first time, due to the exceptionally extensive and reliable ground observation dataset, soil moisture product evaluation has been possible. In contrast to other […]

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Experimental snow measurement methods developed in Sodankylä

New information on manual field measurements of snow water equivalent (SWE) was obtained in Sodankylä Arctic Space Centre as a result of an exceptionally extensive COST ES1404 –field campaign. Similar data set has not been measured before. The results will be utilized in harmonizing snow measurements and improving their quality and usability. Thereby, also the […]

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The unique Sodankylä ground measurement network is utilized in the quality control of the global satellite-based monitoring of soil moisture and frost

Satellite applications are dependent on ground reference measurements to ensure the usefulness of the results. Sodankylä region is particularly well suited for validation and comparison of various satellite measurements. More information: Researcher Kimmo Rautiainen, kimmo.rautiainen@fmi.fi Colliander, A., Jackson, T.J., Bindlish, R., Chan, S., Das, N., Kim, S.B., Cosh, M.H., Dunbar, R.S., Dang, L., Pashaian, L., Asanuma, […]

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