Assessment of the role of sea surface fluxes on eastern Mediterranean explosive cyclogenesis with the aid of the limited-area model COSMO.GR

2018 ◽  
Vol 208 ◽  
pp. 132-147 ◽  
Author(s):  
John Kouroutzoglou ◽  
Euripides N. Avgoustoglou ◽  
Helena A. Flocas ◽  
Maria Hatzaki ◽  
Panagiotis Skrimizeas ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Surface Fluxes ◽  
Sea Surface ◽  
Limited Area ◽  
Limited Area Model ◽  
Area Model

scholarly journals Historical observation impact assessments for EUMETNET using the ALADIN/HU limited area model

Időjárás ◽  
2021 ◽  
Vol 125 (4) ◽  
pp. 555-570
Author(s):  
Roger Randriamampianina ◽  
András Horányi ◽  
Gergely Bölöni ◽  
Gabriella Szépszó
Keyword(s):  
Short Range ◽  
Limited Area ◽  
Aircraft Measurements ◽  
Satellite Measurements ◽  
Limited Area Model ◽  
Area Model ◽  
Lateral Boundary Conditions ◽  
System Experiment ◽  
Historical Observation

Two historical Observing System Experiment (OSE) studies using the ALADIN limited area model and its assimilation system are described. The first study, using an OSE scenario that minimizes the impacts of observations through the lateral boundary conditions, demonstrated the importance of each assimilated terrestrial (radiosonde, aircraft, and wind profiler) observations on the analyses and short-range forecasts of the ALADIN/HU model and proved evidence, that the role of conventional observations cannot be even partly taken over by satellite measurements without degradation of the forecast quality. The second study demonstrated that the assimilation of radiosonde observations remains indispensable even with a progressively increasing amount of aircraft measurements.

scholarly journals Impact of the assimilation of conventional data on the quantitative precipitation forecasts in the Eastern Mediterranean

2006 ◽  
Vol 7 ◽  
pp. 237-242 ◽  
Author(s):  
N. Mazarakis ◽  
V. Kotroni ◽  
K. Lagouvardos ◽  
S. Music ◽  
S. Nickovic
Keyword(s):  
Initial Conditions ◽  
Eastern Mediterranean ◽  
Regional Scale ◽  
Heavy Precipitation ◽  
Objective Analysis ◽  
Limited Area ◽  
Limited Area Model ◽  
Quantitative Precipitation Forecasts ◽  
Surface Station

Abstract. This study is devoted to the evaluation of the role of assimilation of conventional data on the quantitative precipitation forecasts at regional scale. The conventional data included surface station reports as well as upper air observations. The analysis was based on the simulation of 15 cases of heavy precipitation that occurred in the Eastern Mediterranean. The verification procedure revealed that the ingestion of conventional data by objective analysis in the initial conditions of BOLAM limited area model do not result in a statistically significant improvement of the quantitative precipitation forecasts.

scholarly journals Numerical simulation of a deep Mediterranean storm and its sensitivity on sea surface temperature

2011 ◽  
Vol 11 (5) ◽  
pp. 1233-1246 ◽  
Author(s):  
P. Katsafados ◽  
E. Mavromatidis ◽  
A. Papadopoulos ◽  
I. Pytharoulis
Keyword(s):  
High Resolution ◽  
Eastern Mediterranean ◽  
General Structure ◽  
Lower Boundary ◽  
Surface Fluxes ◽  
Sea Surface ◽  
Limited Area ◽  
Pressure System ◽  
Western Turkey ◽  
The Impact

Abstract. The development and evolution of a deep low-pressure system over the Eastern Mediterranean has been investigated in comparative numerical experiments with a limited area model using climatological, gridded analyses, satellite-derived and high-resolution re-analysis sea surface temperatures (SSTs) as lower boundary conditions. The severe event of 21–22 January 2004 was selected in view of its strength and considerable impact on the coastal communities of the Northern Aegean Sea. The aim of this study is to investigate the sensitivity of storm development and intensity to the different SST sources. High resolution model simulations were performed resolving mesoscale features modulated by the different source of SSTs. Although the atmospheric response was considerable in terms of rain bands and surface fluxes, the general structure of the system was not significantly affected by the different air-sea interaction forcing. The impact on the model performance (and therefore its forecasting skill) was further assessed on the basis of quantitative verification statistics estimated throughout the period of the simulations. The methodology was based on the verification against surface observations from the World Meteorological Organization network, covering Southern Greece and the coastal areas of Western Turkey. The estimated statistical scores revealed small but noticeable deviations among the forecast skills of the simulations.

27 Years of Regional Cooperation for Limited Area Modelling in Central Europe

2018 ◽  
Vol 99 (7) ◽  
pp. 1415-1432 ◽  
Author(s):  
Yong Wang ◽  
Martin Belluš ◽  
Andrea Ehrlich ◽  
Máté Mile ◽  
Neva Pristov ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Central Europe ◽  
Regional Cooperation ◽  
Weather Prediction ◽  
Ensemble Forecasting ◽  
Limited Area ◽  
Member States ◽  
Limited Area Model ◽  
Area Model ◽  
Common System

AbstractThis paper describes 27 years of scientific and operational achievement of Regional Cooperation for Limited Area Modelling in Central Europe (RC LACE), which is supported by the national (hydro-) meteorological services of Austria, Croatia, the Czech Republic, Hungary, Romania, Slovakia, and Slovenia. The principal objectives of RC LACE are to 1) develop and operate the state-of-the-art limited-area model and data assimilation system in the member states and 2) conduct joint scientific and technical research to improve the quality of the forecasts.In the last 27 years, RC LACE has contributed to the limited-area Aire Limitée Adaptation Dynamique Développement International (ALADIN) system in the areas of preprocessing of observations, data assimilation, model dynamics, physical parameterizations, mesoscale and convection-permitting ensemble forecasting, and verification. It has developed strong collaborations with numerical weather prediction (NWP) consortia ALADIN, the High Resolution Limited Area Model (HIRLAM) group, and the European Centre for Medium-Range Weather Forecasts (ECMWF). RC LACE member states exchange their national observations in real time and operate a common system that provides member states with the preprocessed observations for data assimilation and verification. RC LACE runs operationally a common mesoscale ensemble system, ALADIN–Limited Area Ensemble Forecasting (ALADIN-LAEF), over all of Europe for early warning of severe weather.RC LACE has established an extensive regional scientific and technical collaboration in the field of operational NWP for weather research, forecasting, and applications. Its 27 years of experience have demonstrated the value of regional cooperation among small- and medium-sized countries for success in the development of a modern forecasting system, knowledge transfer, and capacity building.

scholarly journals A numerical study of the windstorm Klaus: sensitivity to sea surface temperature

2014 ◽  
Vol 57 (5) ◽  
Author(s):  
Nazario Tartaglione ◽  
Rodrigo Caballero
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Numerical Study ◽  
Heat Fluxes ◽  
Sea Surface ◽  
Moisture Convergence ◽  
Convective Precipitation ◽  
Limited Area ◽  
Weather Forecasts

<p>This article investigates the role of sea surface temperature (SST) as well as the effects of evaporation and moisture convergence on the evolution of cyclone Klaus, which occurred on January 23 and 24, 2009. To elucidate the role of sea surface temperature (SST) and air–sea fluxes in the dynamics of the cyclone, ten hydrostatic mesoscale simulations were performed by Bologna Limited Area Model (BOLAM). The first one was a control experiment with European Centre for Medium-Range Weather Forecasts (ECMWF) SST analysis. The nine following simulations are sensitivity experiments where the SST are obtained by adding a constant value by 1 to 9 K to the ECMWF field. Results show that a warmer sea increases the surface latent heat fluxes and the moisture convergence, favoring the development of convection in the storm. Convection is affected immediately by the increased SST. Later on, drop of mean sea level pressure (MSLP) occurs together with increasing of surface winds. The cyclone trajectory is not sensitive to change in SST differently from MSLP and convective precipitation.</p>

Sign in / Sign up

Export Citation Format

Share Document