J
Juha Lemmetyinen
Researcher at Finnish Meteorological Institute
Publications - 187
Citations - 3489
Juha Lemmetyinen is an academic researcher from Finnish Meteorological Institute. The author has contributed to research in topics: Snow & Radiometer. The author has an hindex of 29, co-authored 166 publications receiving 2521 citations. Previous affiliations of Juha Lemmetyinen include Aalto University & Chinese Academy of Sciences.
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Journal ArticleDOI
Estimating northern hemisphere snow water equivalent for climate research through assimilation of space-borne radiometer data and ground-based measurements
Matias Takala,Kari Luojus,Jouni Pulliainen,Chris Derksen,Juha Lemmetyinen,J.-P. Karna,Jarkko Koskinen,Bojan Bojkov +7 more
TL;DR: In this paper, an algorithm assimilating synoptic weather station data on snow depth with satellite passive microwave radiometer data is applied to produce a 30-year-long time-series of seasonal snow water equivalent (SWE) for the northern hemisphere.
Journal ArticleDOI
Patterns and trends of Northern Hemisphere snow mass from 1980 to 2018.
Jouni Pulliainen,Kari Luojus,Chris Derksen,Lawrence Mudryk,Juha Lemmetyinen,Miia Salminen,Jaakko Ikonen,Matias Takala,Juval Cohen,Tuomo Smolander,Johannes Norberg +10 more
TL;DR: Applying a bias correction to a state-of-the-art dataset covering non-alpine regions of the Northern Hemisphere and to three other datasets yields a more constrained quantification of snow mass in March from 1980 to 2018, enabling a better estimation of the role of seasonalSnow mass in Earth's energy, water and carbon budgets.
Journal ArticleDOI
Detection of soil freezing from L-band passive microwave observations
Kimmo Rautiainen,Juha Lemmetyinen,Mike Schwank,Anna Kontu,Cécile B. Ménard,Christian Mätzler,Matthias Drusch,Andreas Wiesmann,Jaakko Ikonen,Jouni Pulliainen +9 more
TL;DR: In this paper, a novel algorithm for detecting seasonal soil freezing processes using L-band microwave radiometry is presented. But the method is not suitable for the monitoring of soil freezing, due to the inherent high contrast of the microwave signature between the frozen and thawed states of the soil medium.
Journal ArticleDOI
L-Band Radiometer Observations of Soil Processes in Boreal and Subarctic Environments
Kimmo Rautiainen,Juha Lemmetyinen,Jouni Pulliainen,Juho Vehviläinen,Matthias Drusch,Anna Kontu,Juha Kainulainen,Jaakko Seppänen +7 more
TL;DR: Results show that soil freezing and thawing processes have an observable effect on the L-band signature of soil, and the presented emission model is able to relate the observed dynamics in brightness temperature to the increase of soil frost.
Journal ArticleDOI
SMOS prototype algorithm for detecting autumn soil freezing
Kimmo Rautiainen,Tiina Parkkinen,Juha Lemmetyinen,Mike Schwank,Andreas Wiesmann,Jaakko Ikonen,Chris Derksen,S. P. Davydov,Anna Davydova,Julia Boike,Moritz Langer,Matthias Drusch,Jouni Pulliainen +12 more
TL;DR: In this paper, a prototype algorithm for hemispheric scale detection of autumn soil freezing using space-borne L-band passive microwave observations is presented, based on earlier empirical and theoretical studies of Lband emission properties of freezing and thawing soils.