A5051879247- Meteorological Phenomena and Simulations
- Climate variability and models
- Wind and Air Flow Studies
- Ocean Waves and Remote Sensing
- Urban Heat Island Mitigation
- Tropical and Extratropical Cyclones Research
- Coastal and Marine Dynamics
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Building Energy and Comfort Optimization
- Plant Water Relations and Carbon Dynamics
- Aeolian processes and effects
- Geophysics and Gravity Measurements
- Climate Change and Environmental Impact
- Education Practices and Evaluation
- Environmental Policies and Emissions
- Aerosol Filtration and Electrostatic Precipitation
- Climate change and permafrost
- transportation and logistics systems
- Radioactive contamination and transfer
- Cyclone Separators and Fluid Dynamics
- Climate Change and Health Impacts
- Vehicle emissions and performance
- Solar Radiation and Photovoltaics
- Smart Materials for Construction
Finnish Meteorological Institute
2013-2024
German Meteorological Service
2001
University of Helsinki
1986-1996
The performance of three urban land‐surface models, run in off‐line mode, with their default external parameters, is evaluated for two distinctly different sites Helsinki: Torni and Kumpula. former a dense city‐centre site 22% vegetation, while the latter suburban over 50% vegetation. At both locations models are compared against sensible latent heat fluxes measured using eddy covariance technique, along snow depth observations. cold climate experienced by city causes strong seasonal...
ABSTRACT The Finnish Wind Atlas was prepared applying the mesoscale model AROME with 2.5 km horizontal resolution and diagnostic downscaling method Analysis Application Programme (WAsP) 250 m resolution. latter applied for areas most favourable wind power production: a 30 wide coastal/offshore zone, highlands, large lakes fields. methodology included several novel aspects: (i) climatologically representative period of real 48 months during 1989–2007 simulated model; (ii) in addition,...
Abstract Wind information in urban areas is essential for many applications related to air pollution, climate and planning, safety of drone‐related operations, assessment wind energy potential. These require accurate forecasts, obtaining this an environment challenging as the morphology a city varies from street street, altering flow. Remote sensing techniques such Doppler lidars (light detection ranging) provide unique opportunity forecast verification they can both vertical profile...
In this paper we investigate the role of high-frequency transient eddies in maintenance blocking high which occurred over Europe on 16-25 February 1979. Time-filtering is used to decompose atmospheric large-scale flow into contributions from and low-frequency fluctuations. separation being roughly at period six days. The net effect ten-day mean cyclone-scale studied using several methods. vorticity flux convergence associated with eddies, although small comparison dominating terms vertically...
Abstract Wind gusts are traditionally observed and reported at the reference height of 10 m most gust parametrization methods have been developed only for this height. In many practical applications, e.g. in wind energy, relevant heights are, however, up to a few hundred metres. study, mean gustiness conditions were studied using observations from two coastal/archipelago weather masts Gulf Finland (northern Europe) with observation between 30 143 m. Only moderate strong cases addressed. Both...
The increasing size of wind turbines, their height and the area swept by blades have revised need for understanding vertical structure gusts. Information is needed whole profile. In this study, we analyzed turbulence measurements from a 100 m high meteorological mast at Danish National Test Station Large Wind Turbines Hóvsóre in Denmark. site represents flat, homogeneous grassland with an average gust factor 1.4 10 1.2 level. typical surface‐layer parametrization, composed two components,...
Due to climate change, there is an increased risk of apartment overheating. In Nordic countries, heatwaves have not been common in the past and hence apartments are equipped with mechanical cooling systems, so wise urban design might be a solution. This study evaluated influence microenvironment on residential building indoor air temperature via green view index (GVI), floor area ratio distance from sea. We analyzed large dataset over 2000 Helsinki region during summers 2018 2021, where...
The Baltic Sea Experiment (BALTEX) is one of the five continental-scale experiments Global Energy and Water Cycle (GEWEX). More than 50 research groups from 14 European countries are participating in this project to measure model energy water cycle over large drainage basin northern Europe. BALTEX aims provide a better understanding processes climate system improve validate regional numerical models for weather forecasting studies. A major effort undertaken couple interactively atmosphere...
The Helsinki Urban Boundary-Layer Atmosphere Network (UrBAN: http://urban.fmi.fi) is a dedicated research-grade observational network where the physical processes in atmosphere above city are studied. UrBAN most poleward intensive urban research observation world and thus will allow studying some unique features such as strong seasonality. network's key purpose for understanding of boundary layer associated fluxes heat, momentum, moisture, other gases. A further to secure database, which can...
Abstract. A significant wave height of 7 m has been measured five times by the northern Baltic Proper buoy in Sea, exceeding 8 twice (2004 and 2017). We classified these storms into two groups duration steepness. Interestingly, highest events exhibited opposite properties, with 2017 event being longest storm on record. This is also first where harshest conditions were modelled to occur western part Proper. The metrics quantifying storm's steepness might aid issuing warnings for extreme conditions.
Major nuclear accidents are typically low-probability–high-consequence events. This paper focuses on weather and sea-level events that might affect the safety of power plants (NPPs). Flooding risks at Finnish NPP sites have been re-evaluated based investigations long-term changes short-term variations in sea level, which has led to improvements protection against extremely high water level. Climate change projections indicated 1000-year return levels enthalpy air would increase by 13–27%...
Performance of meso-scale numerical weather prediction model HARMONIE-AROME was assessed for a summer-time heatwave in high-latitude coastal city Turku SW Finland. Representativeness the model's ECOCLIMAP-SG based physiographic land cover specification with resolution 750 m against 20 CORINE Land Cover (CLC) dataset. Moreover, modelled 2 air temperatures were compared temperature observations recorded at 74 sites local climate observation network. Correlation analysis between data (PGD) and...
Abstract. Sodankylä, in the heart of Arctic Research Centre Finnish Meteorological Institute (FMI ARC) northern Finland, is an ideal site for atmospheric and environmental research boreal sub-Arctic zone. With temperatures ranging from −50 to +30 °C, it provides a challenging testing ground numerical weather forecasting (NWP) models as well general. An extensive set measurements has been carried out Sodankylä more than 100 years. In 2000, 48 m-high micrometeorological mast was...
ABSTRACT Considerable savings in winter road maintenance and accident costs can be achieved with accurate weather forecasts. Forecasting surface freezing time accurately enables the timely start of salting thus ensures safety on roads. The optimal use observations is essential for accuracy short‐range condition Road models incorporate radiation other atmospheric variables from numerical prediction models. In this study, were used to correct forecast improve forecasts a set specific sites....
In this work, the climatic impacts of modifying urban surface characteristics are examined for medium-sized city Vantaa, Finland, in current climate and a projected future 2040-2069. simulations with SURFEX air-surface interaction model horizontal resolution 500 m, fraction green spaces relatively sparsely built suburban-type land use was increased at expense more densely commercial industrial areas. The influence intervention found to be rather modest but comparable effects expected change...
A short review of atmospheric energy transport studies is given, and the importance Global Weather Experiment for such emphasized. The accuracy flux (divergence) estimates then discussed, comparing results obtained February 1979 from two independent sets analyses using same procedures. It concluded that at present uncertainty in zonally averaged monthly mean poleward (dry static) order 1 × 1015 W, being less extratropics than tropics. indicate estimation global distribution diabatic heating...
Abstract Forecast errors in near-surface temperatures are a persistent issue for numerical weather prediction models. A prominent example is warm biases during cloud-free, snow-covered nights. Many studies attribute these to parametrized processes such as turbulence or radiation. Here, we focus on the contribution of physical nocturnal temperature development. We compare model timestep output individual tendencies from AROME-Arctic measurements Sodankylä, Finland. Thereby, differentiate...
Abstract This paper presents a case study of single cold air outbreak event with widespread convective precipitation over southern Finland on 25 May 2001. The purpose the is to investigate applicability convection and condensation scheme High-Resolution Limited Area Model (HIRLAM) meso-γ-scales. concentrates issue grid-size-dependent parameterization. An explicit approach without also examined. At same time, performance an experimental nonhydrostatic version HIRLAM evaluated. simulations are...
Abstract The Finnish Meteorological Institute has produced a new numerical weather prediction model–based wind atlas of Finland. provides information on local conditions in terms annual and monthly speed direction averages. In the context project, low-level Applications Research to Operations at Mesoscale (AROME) model forecasts have been validated against radar radial observations and, as comparison, conventional radiosonde confirm realism forecasts. results indicate that systematic random...
There is as yet no standard methodology for measuring wind gusts from a moving platform. To address this, we have developed method to derive research aircraft data. First evaluated four different approaches, including Taylor's hypothesis of frozen turbulence, the gust length‐scales that correspond time‐scales, namely duration (s) and sample period (typically 10 min). The novelty our lies in using peak factors (deviation mean speed normalized by local turbulence) convert between scales. After...