High-resolution dynamical downscaling of ERA-Interim temperature and precipitation using WRF model for Greece

Politi, Nadia; Vlachogiannis, Diamando; Sfetsos, Athanasios; Nastos, P. T.

doi:10.1007/s00382-021-05741-9

Cited by 26 publications

(9 citation statements)

References 72 publications

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“…(2021). In the study area, the good representation of the major mountainous locations and coastline obtained with the downscaling approach allows the production of cyclogenesis and the associated orographic wind systems whatever the quality of the large scale circulation provided at the RCM's boundaries by the global model (Politi et al 2021) The annual relative differences in Fig. 9 (a) showed a consistent pattern of underestimated annual precipitation from WRFEC in the range of 0.2 to 0.4%, in the west and north stations of the country.…”

Section: Precipitationmentioning

confidence: 99%

“…These selected schemes of setups were further investigated in the work of (Politi et al 2020) for a period of ve years to nally obtain the optimal con guration of the model setup for long-term simulations. The most recent study (Politi et al 2021) investigated the performance of the WRF model to dynamically downscale the coarseresolution ERA-Interim dataset to the high spatial resolution of 5 km grid over the area of Greece for the period of 30 years. It was the rst study in which the WRF model performance was evaluated against synoptic meteorological variables and their extremes for the area at high spatial horizontal resolution and a long-term period.…”

Section: Introductionmentioning

confidence: 99%

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High resolution projections for extreme temperatures and precipitation over Greece

Politi

Vlachogiannis

Sfetsos

et al. 2022

Preprint

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The present study investigated future temperature and precipitation changes over Greece using the Weather Research and Forecasting (WRF) model. WRF was driven by EC-EARTH output in the domain of Greece at very high resolution for the historical period (1980–2004), along with projected simulations, in the near future (2025–2049) and far future (2075-2099) under the Representative Concentration Pathways 4.5 (RCP4.5) and 8.5 (RCP8.5). Climatic variables were produced at 5-km grid spacing and 6-h interval. The historical simulation was evaluated against the available station observations. The analysis showed that the model underestimated the maximum temperatures and slightly overestimated the minimum temperatures. Also, the model simulated a small dry bias in precipitation with an excellent representation of the spatial patterns. The model projections for temperature under the two emission scenarios compared to the historical simulation revealed a robust magnitude of future warming with the most pronounced changes predominantly over the eastern areas of the country under the RCP8.5 in the far future. Projected precipitation changes were more evident in the far future with an overall decrease of the annual precipitation all over the eastern part of the country (with islands included) with the most dramatic reductions (above 40%) of seasonal precipitation observed under RCP8.5. Increases in the number of hot days were found everywhere with more pronounced changes over the plain areas under RCP8.5 in the far future. Significant increases of dry days were projected over the eastern part of the mainland and more intensely under RCP8.5 in the far future.

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Section: Precipitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High resolution projections for extreme temperatures and precipitation over Greece

Politi

Vlachogiannis

Sfetsos

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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“…The first model is the latest available reanalysis product ERA 5 from the European Centre for Mediumrange Weather Forecasts (ECMWF) of spatial resolution ∼ 30 km × 30 km (Hersbach et al, 2020). The second reanalysis model, built in the Environmental Research Laboratory (EREL) of the National Center of Scientific Research "Demokritos" (NCSRD) WRF_ERA_I, has been produced by dynamically downscaling ERA-Interim using the Weather Research Forecast (WRF) model (v3.6.1) from 80 km × 80 km to 5 km × 5 km (Politi et al, 2048(Politi et al, , 2020(Politi et al, , 2021.…”

Section: Reanalysis Modelsmentioning

confidence: 99%

Investigation of the extreme wet–cold compound events changes between 2025–2049 and 1980–2004 using regional simulations in Greece

et al. 2022

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Abstract. This paper aims to study wet–cold compound events (WCCEs) in Greece for the wet and cold season November–April since these events may affect directly human activities for short or longer periods, as no similar research has been conducted for the country studying the past and future development of these compound events. WCCEs are divided into two different daily compound events, maximum temperature– (TX) accumulated precipitation (RR) and minimum temperature– (TN) accumulated precipitation (RR), using fixed thresholds (RR over 20 mm d−1 and temperature under 0 ∘C). Observational data from the Hellenic National Meteorology Service (HNMS) and simulation data from reanalysis and EURO-CORDEX models were used in the study for the historical period 1980–2004. The ensemble mean of the simulation datasets from projection models was employed for the near future period (2025–2049) to study the impact of climate change on the occurrence of WCCEs under the Representative Concentration Pathways (RCPs) 4.5 and 8.5 scenarios. Following data processing and validation of the models, the potential changes in the distribution of WCCEs in the future were investigated based on the projected and historical simulations. WCCEs determined by fixed thresholds were mostly found over high altitudes with TN–RR events exhibiting a future tendency to reduce particularly under the RCP 8.5 scenario and TX–RR exhibiting similar reduction of probabilities for both scenarios.

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“…The system includes a four-dimensional variational analysis with a 12 h analysis window. In this study, we selected the ERA-Interim reanalysis dataset since it has been used extensively in WRF downscaling modeling studies [27,28] and performs well in rainfall simulation [29][30][31]. More details on the ERA-Interim dataset can be found on the ECMWF website at http://apps.ecmwf.int/ (accessed on 20 September 2020).…”

Section: Study Area and Datamentioning

confidence: 99%

WRF Rainfall Modeling Post-Processing by Adaptive Parameterization of Raindrop Size Distribution: A Case Study on the United Kingdom

et al. 2021

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Raindrop size distribution (RSD) is a key parameter in the Weather Research and Forecasting (WRF) model for rainfall estimation, with gamma distribution models commonly used to describe RSD under WRF microphysical parameterizations. The RSD model sets the shape parameter (μ) as a constant of gamma distribution in WRF double-moment bulk microphysics schemes. Here, we propose to improve the gamma RSD model with an adaptive value of μ based on the rainfall intensity and season, designed using a genetic algorithm (GA) and the linear least-squares method. The model can be described as a piecewise post-processing function that is constant when rainfall intensity is <1.5 mm/h and linear otherwise. Our numerical simulation uses the WRF driven by an ERA-interim dataset with three distinct double-moment bulk microphysical parameterizations, namely, the Morrison, WDM6, and Thompson aerosol-aware schemes for the period of 2013–2017 over the United Kingdom at a 5 km resolution. Observations were made using a disdrometer and 241 rain gauges, which were used for calibration and validation. The results show that the adaptive-μ model of the gamma distribution was more accurate than the gamma RSD model with a constant shape parameter, with the root-mean-square error decreasing by averages of 23.62%, 11.33%, and 22.21% for the Morrison, WDM6, and Thompson aerosol-aware schemes, respectively. This model improves the accuracy of WRF rainfall simulation by applying adaptive RSD parameterization and can be integrated into the simulation of WRF double-moment microphysics schemes. The physical mechanism of the RSD model remains to be determined to improve its performance in WRF bulk microphysics schemes.

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High-resolution dynamical downscaling of ERA-Interim temperature and precipitation using WRF model for Greece

Cited by 26 publications

References 72 publications

High resolution projections for extreme temperatures and precipitation over Greece

High resolution projections for extreme temperatures and precipitation over Greece

Investigation of the extreme wet–cold compound events changes between 2025–2049 and 1980–2004 using regional simulations in Greece

WRF Rainfall Modeling Post-Processing by Adaptive Parameterization of Raindrop Size Distribution: A Case Study on the United Kingdom

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