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Main features of composite precipitation and large-scale synoptic patterns over Israel and the adjacent areas are analyzed using both the Israel precipitation data and the gridded NCEP/NCAR reanalysis monthly data set from 1958 to 1998.... more
Main features of composite precipitation and large-scale synoptic patterns over Israel and the adjacent areas are analyzed using both the Israel precipitation data and the gridded NCEP/NCAR reanalysis monthly data set from 1958 to 1998. The effect of East Atlantic / West Russian (EA/WR) atmospheric oscillation on precipitation is con- sidered. Results of the analysis revealed a statistically significant relationship between the decadal variations of precipitation in Israel and the EA/WR indices that can be described by linear regressions. The effect of an other main circulation regime, the North Atlantic Oscillation (NAO), has also been investigated. It was found that the precipitation in Israel is determined mainly by the EA/WR regime and to a smaller degree by the NAO regime. The precipitation was most intensive when both the NAO and EA/WR indices were positive. These results can explain the observed decadal variations of the precipitation in Israel by the processes associated wit...
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Natalia Fedorova 1 , Simon O. Krichak 2 , Vladimir Levit 3 , Maria Helena de Carvalho 4 ,. ... e Lifted Index (LI), e, também, foi calculada a energia potencial de convecção ou energia de instabilidade (CAPE, convective available... more
Natalia Fedorova 1 , Simon O. Krichak 2 , Vladimir Levit 3 , Maria Helena de Carvalho 4 ,. ... e Lifted Index (LI), e, também, foi calculada a energia potencial de convecção ou energia de instabilidade (CAPE, convective available potential energy) (Djuric, 1995 e Vasquez, 1994). ...
In this study, forecast errors in dust vertical distributions were analyzed. This was carried out by using quantitative comparisons between dust vertical profiles retrieved from lidar measurements over Rome, Italy, and those predicted by... more
In this study, forecast errors in dust vertical distributions were analyzed. This was carried out by using quantitative comparisons between dust vertical profiles retrieved from lidar measurements over Rome, Italy, and those predicted by models. Three models were used: the ...
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In this study, forecast errors in dust vertical distributions were analyzed. This was carried out by using quantitative comparisons between dust vertical profiles retrieved from lidar measurements over Rome, Italy, and those predicted by... more
In this study, forecast errors in dust vertical distributions were analyzed. This was carried out by using quantitative comparisons between dust vertical profiles retrieved from lidar measurements over Rome, Italy, and those predicted by models. Three models were used: the four-particle-size Dust Regional Atmospheric Model (DREAM), the older one-particle-size version of the SKIRON model from the University of Athens (UOA),
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ABSTRACT During last decades of the past century the Mediterranean region was experiencing a notable overall precipitation decline. The period was also characterized by a precipitation rise over northern west Europe as well as a rise... more
ABSTRACT During last decades of the past century the Mediterranean region was experiencing a notable overall precipitation decline. The period was also characterized by a precipitation rise over northern west Europe as well as a rise (mainly over the south-eastern part of the Mediterranean region) in the frequency and intensity of extreme precipitation events (EPE) during early-spring season. Also noted were significant variations in major teleconnection regimes. To investigate the physical mechanisms involved, globally defined daily NCEP/NCAR reanalysis data for 1961-2000 on precipitation (Prec), integrated water vapor (IWV) and dynamic tropopause pressure (PDT) are analyzed. Frequencies of days with extreme (above 75 percentiles) values of the Prec, PDT and IWV in each month of the 40 year period are determined. Also calculated are the numbers of days per month with the IWV values higher than 10 kg m-2 (IWV10). Linear trends of the characteristics well as their spatial correlations with the time series of major teleconnection indices are determined. Results of the analysis allow explaining observed trends in the Mediterranean precipitation by the corresponding variations in the frequency of the IWV10's. The trends appear to be associated with the global warming process.
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... Xoplaki,^ Eduardo Zorita,^ Jiirg Luterbacher,^ Simon O. Krichak,"^ Pinhas... more
... Xoplaki,^ Eduardo Zorita,^ Jiirg Luterbacher,^ Simon O. Krichak,"^ Pinhas Alpert,"^ Jucundus Jacobeit,^ Jon Saenz,^ Jesiis Fernandez,^ Fidel Gonzalez-Rouco ... such as the Lamb Weather Types for the UK (Lamb, 1972) and the Grosswetterlagen catalogues (Hess and Brezowski ...
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Lasting long enough (from several days to months) episodes with extreme precipitation events (extreme precipitation climate events, EPCE) are quite typical for the Mediterranean region's climate. An analysis of geographical... more
Lasting long enough (from several days to months) episodes with extreme precipitation events (extreme precipitation climate events, EPCE) are quite typical for the Mediterranean region's climate. An analysis of geographical distribution of frequency of occurrence of the EPCE as well as its intraseasonal variation during the Mediterranean rainy season months is performed. Also investigated is the role of large-scale atmospheric dynamics processes over the Mediterranean region in determining the EPCE conditions over the area. An objective methodology based on earlier suggested approach by Carill et al., Clim Dyn, 2008 is adopted to determine frequencies of occurrence of extreme events in several atmospheric characteristics. Daily data on precipitation for 1960-2000 from gridded multiyear dataset National Centers for Environmental Prediction-National Center for Atmospheric Research NCAR-NCEP Reanalysis Project (NNRP) are adopted in the study. A data set with daily data on dynamic ...
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This paper aims to evaluate the impact of future climate change on streamflow and water resources in the Jordan River watershed. Such changes are expected to play an important role in water availability, planning and policy as well as in... more
This paper aims to evaluate the impact of future climate change on streamflow and water resources in the Jordan River watershed. Such changes are expected to play an important role in water availability, planning and policy as well as in the ability to comply with international treaty obligations. Currently, Global Climate Models (GCMs) and Regional Climate Models (RCMs) are the
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Abstract : In the USSR translation, a baroclinic model of the atmosphere based on the use of complete thermohydrodynamics equations is examined. The model describes forecast changes in the fields of the geopotential, wind velocity,... more
Abstract : In the USSR translation, a baroclinic model of the atmosphere based on the use of complete thermohydrodynamics equations is examined. The model describes forecast changes in the fields of the geopotential, wind velocity, temperature, humidity, and surface pressure.
Research Interests: Geography and Meteorology
Abstract : The USSR translation is devoted to a description of the baroclinic atmospheric model based on the solution to the system of complete equations in adiabatic approximation and to the presentation of some of its test results.
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Contribution to Consultation of the Horizon 2020 Societal Challenge 5 Stakeholders: Numerical Weather Forecast Uncertainties Summary: A reliable short–term weather warning system for extreme events (intensive rain, snow, hail, and floods)... more
Contribution to Consultation of the Horizon 2020 Societal Challenge 5 Stakeholders: Numerical Weather Forecast Uncertainties Summary: A reliable short–term weather warning system for extreme events (intensive rain, snow, hail, and floods) is a fundamental basis for developing economy and society resilient to climate change. However, we face here a serious scientific challenge. Operational weather forecast models are now at such high resolutions that individ-ual elements of convective storms are beginning to be explicitly resolved. Under this convection-permitting regime, the traditional forecast methodologies extensively developed for synoptic scales often fail. The forecast is no longer deterministic but fundamentally uncertain: a completely new way of thinking is required based on stochastic probability-based approaches. A strong intervention from basic research is needed in order to identify solid methodologies for the European weather service community. The multi– and inter–disc...