A5059556815- Meteorological Phenomena and Simulations
- Precipitation Measurement and Analysis
- Climate variability and models
- Tropical and Extratropical Cyclones Research
- Hydrology and Drought Analysis
- Building Energy and Comfort Optimization
- Flood Risk Assessment and Management
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Cryospheric studies and observations
- Data Visualization and Analytics
- Wind and Air Flow Studies
- Hydrological Forecasting Using AI
- Science and Climate Studies
- Urban Heat Island Mitigation
- Hydrology and Watershed Management Studies
- Climate Change and Environmental Impact
- Computational Physics and Python Applications
- Soil Geostatistics and Mapping
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- 3D Modeling in Geospatial Applications
- Remote Sensing and LiDAR Applications
University of Ljubljana
2015-2025
Slovenian Centre of Excellence for Space Sciences and Technologies
2010-2015
Karst Research Institute
2009
National and University Library of Slovenia
2009
The Fractions Skill Score ( FSS ) is a spatial verification measure that used for assessing the performance of precipitation forecasts from numerical weather prediction models. Previous studies have shown able to give direct error in placement rain. This article takes approach further and derives analytical expressions uses Monte‐Carlo simulations randomly positioned observed forecast rainfall reveal characteristics both infinite bounded domains. It reveals definition an value determines...
Abstract Mesoscale convective systems (MCSs) constitute only a fraction of in the tropics but significantly impact tropical weather and global climate. Early studies used satellite infrared (IR) data to track MCSs study their properties for short period due computing limitations. Though valuable, IR brightness temperature (Tb)‐derived precipitation have biases. The recent availability Integrated Multi‐satEllite Retrieval Global (IMERG) mission rainfall lesser bias than Tb‐based access...
[1] The intertropical convergence zone (ITCZ) is usually analyzed in terms of the precipitation field. This study presents a new climatology ITCZ based on winds from ERA Interim reanalyses for period 1990–2009. central latitude defined as zero crossing meridional wind averaged over 10 model levels below 900 hPa. Results zonal averaging and are compared with zonally TRMM data sets. Collocation properties maxima discussed different land ocean regions. It found that location fields coincides...
Abstract A recently developed object identification algorithm is applied to multisensor precipitation estimates from the Tropical Rainfall Measuring Mission (TRMM 3B42) detect and quantify contribution of tropical cyclone (TCP) total between 1998 2008. The study period includes 1144 storms. Estimates TCP derived here are similar in pattern seasonal variation earlier but somewhat higher magnitude. Annual-mean fractions over 20% diagnosed large swaths ocean, with means some regions more than...
ABSTRACT In the study, climate regions of Slovenia were determined. The regionalization was based on gridded data for reference period 1981–2010. climatic performed predominately objectively with a combination two statistical methods; factor analysis which followed by k ‐means clustering. With use initial number 31 variables reduced to four or factors, comprised input cluster where divided into six regions: Submediterranean region, Wet hilly Moderate Subcontinental Subalpine region and...
Forecasting convective storms is one of the most challenging tasks in Numerical Weather Prediction (NWP). Data Assimilation (DA) methods improve initial condition and subsequent forecasts by combining observations previous model (background). radar provides a dense source storm monitoring. Therefore, assimilating data should significantly forecasting skills. However, extrapolating rainfall patterns (nowcasting) from often better than numerical model-based with DA first 2 or 3 hours (Fabry...
Precipitation is one of the most important meteorological parameters and notoriously difficult to measure, predict, also verify. Distance measures are five classes spatial verification metrics that try address problems traditionally used non-spatial methods (which only compare values at collocated grid points). provide an estimate distance between events in two fields, which relatively easy interpret understand. Our goal was develop a new measure for precipitation would not require...
Discriminating the absorption coefficients of aerosol mineral dust and black carbon (BC) in different size fractions is a challenge because BC's large mass cross-section compared to dust. Ambient wavelength dependent (babs) supermicron submicron were determined with high time resolution. The measurements performed simultaneously using identical systems at an urban regional background site Qatar. At each site, taken by co-located Aethalometers, one virtual impactor (VI) other PM1 cyclone...
Abstract. An integrated modelling system based on the regional online coupled meteorology–atmospheric chemistry WRF-Chem model configured with two nested domains horizontal resolutions of 11.1 and 3.7 km has been applied for numerical weather prediction air quality forecasts in Slovenia. In study, an evaluation forecasting performed summer 2013. case ozone (O3) daily maxima, first- second-day predictions have also compared to operational statistical O3 forecast persistence. Results discrete...
Abstract The Method for Object-based Diagnostic Evaluation (MODE) developed by Davis et al. is implemented and extended to characterize the temporal behavior of objects perform a diagnostic analysis on spatial distribution properties precipitation systems over equatorial Pacific Ocean. performed two satellite-derived datasets [Tropical Rainfall Measuring Mission (TRMM) 3B42 Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks (PERSIANN)]. A sensitivity...
A compact analytical expression of the Fraction Skill Score (FSS) is derived for a case with single displaced rainband in rectangular domain. The oriented parallel to border and perpendicularly its orientation. An solution used determine some properties FSS which might also be applicable other cases. independent length (it valid rainy grid point). position borders perpendicular orientation does not influence value. two however value complex way; moving closer rainbands can either increase or...
Abstract Novel precipitation event data sets are created by tracking 3‐hourly observed rainfall in both time and space the TRMM 3B42 ERA‐Interim sets. Relative to TRMM, undersimulate total number of events (factor ∼0.5), oversimulate frequency lasting >5 days 1.6). Longer‐lasting tend have larger spatial footprints higher intensity at any point their lifetime, thus contribute significantly more than shorter events. Precipitation changes selected tropical subtropical regions attributed...
The Fractions Skill Score ( FSS ) is a popular spatial verification metric commonly used for precipitation verification. In this study we focus on analysing the ability of to provide meaningful information about displacement between in one field compared another. A simple overlap‐adjusted use introduced and number relevant idealized cases are analysed that show can indeed be determine way. It was found provided by directly related true displacements but with larger contiguous objects having...
Abstract An extended version of the Method for Object-based Diagnostic Evaluation (MODE) was used to perform a verification precipitation provided by Weather Research and Forecasting (WRF) model Tropical Channel Simulation (performed NCAR). Model 3-hourly accumulations were compared Rainfall Measuring Mission (TRMM) 3B42 satellite-derived in low- midlatitude Pacific Ocean during 1998–2000. Overall, spatial distribution annual mean (i.e., clear shape ITCZ with two maxima—one located east one...
Abstract A novel wind verification methodology is presented and analyzed for six surface cases in the greater Alpine region as well an idealized setup. The based on idea of fractions skill score, a neighborhood-based spatial metric frequently used verifying precipitation. new score avoids problems traditional nonspatial metrics (the “double penalty” problem failure to distinguish between “near miss” much poorer forecasts) can forecasts even when displacement patterns large. Moreover,...
Deficiencies of the nesting technique for regional models and their internal variability represent a significant source uncertainties in model outputs. Presented numerical experiments on four different‐size domains, two them being midlatitude channel show that spatial structure magnitude strongly depend domain size. The are performed by using Weather Research Forecasting (WRF) nested into operational European Centre Medium‐Range Forecasts (ECMWF) analyses same horizontal resolution 0.25°×...
Abstract The Universal Thermal Climate Index (UTCI) is a thermal comfort index that describes how the human body experiences ambient conditions. It has units of temperature and considers physiological aspects body. takes into account effect air temperature, humidity, wind, radiation, clothes. increasingly used in many countries as measure for outdoor conditions, its value calculated part operational meteorological forecast. At same time, forecasts UTCI tend to have relatively large error...
Abstract Mesoscale Convective Systems (MCSs) are often quantified via surface‐based radar network, geostationary satellite, or low earth orbit satellite observations. However, each of these has drawbacks for detecting cloud systems such as a lack global coverage, variables to quantify deep convective and precipitation properties, continuous observations individual MCSs, respectively. To generate dataset tropical Tracked IMERG Precipitation (TIMPS), we use the Forward in Time tracking...
Abstract As part of the second phase spatial forecast verification intercomparison project (ICP), dubbed Mesoscale Verification Intercomparison in Complex Terrain (MesoVICT) project, a new set idealized test fields is prepared. This paper describes these and their rationale uses them to analyze number summary measures associated with distance geometric-based approaches. The results provide guidance about how they inform performance under various scenarios. case comparisons are grouped into...
This study aims to assess the capability of regional climate models (RCMs) simulate precipitation climatology over southeastern Alpine flanks, where complex orography prevails. Precipitation simulations from 14 different 40-year downscaling experiments (1961–2000) driven by ERA-40 reanalysis ENSEMBLES project are analysed in terms realistic reproduction spatial and temporal seasonal patterns Slovenia. The best RCM performance was found for winter when is mainly caused large-scale processes....
The aim of this study is to used heavy precipitation data from Slovenia find the highest resolution Numerical Weather Prediction model where cell averaged interpolated fields 24hour rain gauge which was independent interpolation method. 20 out 104 observed cases period 1995-2002 in were selected, 10 convective and stratiform. Three different methods used: Universal Kriging, Inverse Distance Weighted Radial Basis Functions. Each method aggregated direct performed. cross-validation results...