H
Heikki Järvinen
Researcher at University of Helsinki
Publications - 98
Citations - 3419
Heikki Järvinen is an academic researcher from University of Helsinki. The author has contributed to research in topics: Data assimilation & Numerical weather prediction. The author has an hindex of 26, co-authored 98 publications receiving 3114 citations. Previous affiliations of Heikki Järvinen include Finnish Meteorological Institute & European Centre for Medium-Range Weather Forecasts.
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Journal ArticleDOI
The ECMWF operational implementation of four-dimensional variational assimilation. I: Experimental results with simplified physics
TL;DR: In this paper, a comprehensive set of physical parametrizations has been linearized for use in the European Centre for Medium-Range Weather Forecasts (ECMWF's) incremental four-dimensional variational (4D-Var) system described in Part I.
HIRLAM-5 Scientific documentation
Per Undén,Laura Rontu,Heikki Järvinen,Peter Lynch,Francisco Javier Calvo Sánchez,Gerard Cats,Joan Cuxart,Kalle Eerola,Carl Fortelius,José Antonio García-Moya,Colin Jones,Geert Lenderink,Aidan McDonald,Ray McGrath,Beatriz Navascués,Niels Woetman-Nielsen,Viel Odegaard,Ernesto Rodríguez Camino,Markku Rummukainen,Rein Room,Kai Sattler,Bent Hansen Sass,Hannu Savij arvi,Ben Wichers Schreur,Robert Sigg,Aleksander Tijm +25 more
Journal ArticleDOI
Leaf litter decomposition-Estimates of global variability based on Yasso07 model
Mikko Tuomi,Mikko Tuomi,Tea Thum,Heikki Järvinen,Stefan Fronzek,Björn Berg,Mark E. Harmon,John A. Trofymow,Sanna Sevanto,Jari Liski +9 more
TL;DR: In this paper, the authors investigated the global patterns of litter decomposition and developed a description of this process and tested the validity of this description using a large set of foliar litter mass loss measurements (nearly 10,000 data points derived from approximately 70,000 litter bags).
Journal ArticleDOI
Variational quality control
Erik Anderson,Heikki Järvinen +1 more
TL;DR: In this paper, the authors describe the implementation of variational quality control in the operational four-dimensional variational data assimilation scheme at the European Centre for Medium-Range Weather Forecasts (ECMWF) the quality control takes place during the iterative solution of the variational analysis problem itself, rather than in a separate step prior to the main analysis.
Journal ArticleDOI
Human population dynamics in Europe over the Last Glacial Maximum.
TL;DR: It is shown that the dynamics of the human population in Europe from 30,000 to 13,000 y ago can be simulated using ethnographic and paleoclimate data within the climate envelope modeling approach, and correspondence between the population simulation and archaeological data suggests that population dynamics were indeed driven by major climate fluctuations.