E. Elizbarashvili - Profile on Academia.edu (original) (raw)

Papers by E. Elizbarashvili

მეტეოროლოგიური დაკვირვებები იაკობ გოგებაშვილის სახელობის თელავის სახელმწიფო უნივერსიტეტის ავტომატურ მეტეოსადგურზე

Modeling of the Stochastic Process of Joint Implementation of Various Dangerous and Catastrophic Meteorological Phenomena

წარმოდგენილია საშიში და კატასტროფული მეტეოროლოგიური მოვლენების ერთდროული რეალიზაციის მოდელირების ... more წარმოდგენილია საშიში და კატასტროფული მეტეოროლოგიური მოვლენების ერთდროული რეალიზაციის მოდელირების კონცეფცია. განხილულია მოდელირების რამოდენიმე ვარიანტი.The concept of modeling the joint implementation of hazardous and catastrophic meteorological phenomena is presented. Several modeling options are considered

Assessment of Climatic Risks from Hazardous Weather Phenomena

Droughts, strong winds, hurricanes, torrential rains, hail, floods, floods, blizzards, extreme te... more Droughts, strong winds, hurricanes, torrential rains, hail, floods, floods, blizzards, extreme temperatures, and other similar disasters cause more severe economic losses than volcanic eruptions, tsunamis, and earthquakes, and these hazards pose climate risks. The main factors of the process of occurrence of climatic risk of dangerous meteorological phenomena are considered. The article describes a methodology for assessing the vulnerability of objects (risk recipients) exposed to hazardous phenomena. On the example of two points located in different geographical conditions - Tbilisi and Dmanisi, possible social and economic risks associated with these phenomena are identified. The greatest climatic danger is represented by fog and strong winds, and in summer, Tbilisi is very hot with concomitant soil, atmospheric drought, and extreme fire hazards. To a lesser extent, the area is damaged by heavy rainfall and hail

Based on the materials of observation of 50 meteorological stations of Georgia for the period bet... more Based on the materials of observation of 50 meteorological stations of Georgia for the period between 1936-2013, research has been made of geography, structure, intensity, duration and dynamics of tropical nights on the Georgian territory. Nights are considered tropical if minimum air temperature is above 20°C (TR20). Tropical nights are most widespread in the intermountain trough – Kolkheti lowland, the plains of Central and Lower Kartli, Alazani valley, where the average number of tropical nights during one year reaches 35. With the growth of altitude, the number of tropical nights naturally decreases, and on the height of 1000m there are no tropical nights detected. As a result of global warming the increase in the number of tropical nights has been most notable on the Black Sea coast and in the region of the nearby Kolkheti lowland (4-6 days per decade). In the internal regions of the lowland and in the Eastern Georgia the rate of change decreases. On the Black Sea coast tropica...

Russian Meteorology and Hydrology, 2020

High-dimensional gene expression data provide a rich source of information because they capture t... more High-dimensional gene expression data provide a rich source of information because they capture the expression level of genes in dynamic states that reflect the biological functioning of a cell. For this reason, such data are suitable to reveal systems related properties inside a cell, e.g., in order to elucidate molecular mechanisms of complex diseases like breast or prostate cancer. However, this is not only strongly dependent on the sample size and the correlation structure of a data set, but also on the statistical hypotheses tested. Many different approaches have been developed over the years to analyze gene expression data to (I) identify changes in single genes, (II) identify changes in gene sets or pathways, and (III) identify changes in the correlation structure in pathways. In this paper, we review statistical methods for all three types of approaches, including subtypes, in the context of cancer data and provide links to software implementations and tools and address also the general problem of multiple hypotheses testing. Further, we provide recommendations for the selection of such analysis methods. Reviewers: This article was reviewed by Arcady Mushegian, Byung-Soo Kim and Joel Bader.

Russian Meteorology and Hydrology, 2019

Based on observational data from 25 weather stations for the period of 1936-2013, the statistical... more Based on observational data from 25 weather stations for the period of 1936-2013, the statistical structure, intensity, and duration of frosts as well as the dynamics of the number of frost days in the mountain regions of Georgia are investigated. The continuous duration of frosts, the time of the occurrence, the frequency of different gradations of the number of frost days, and the regularities of their long-term variations are revealed.

Tropical Nights in Georgia

Russian Meteorology and Hydrology, 2018

Based on observational data from 30 weather stations in Georgia for the period of 1936–2013, the ... more Based on observational data from 30 weather stations in Georgia for the period of 1936–2013, the geography, statistical structure, intensity, duration, and dynamics of tropical nights are investigated. The geoinformation map was constructed for the number of tropical nights for the WMO base period. The periods of occurrence and return of their different gradations and the regularities of long-term variations are revealed.

Russian Meteorology and Hydrology, 2017

Ab stract-Vari a tions in the num ber of hot days, their fre quency, in ten sity, and du ra tion ... more Ab stract-Vari a tions in the num ber of hot days, their fre quency, in ten sity, and du ra tion in Geor gia are stud ied us ing ob ser va tional data from 50 weather sta tions for the pe riod of 1936-2013. The pe ri ods of the on set of hot days in the year and their max i mum in ten sity in dif fer ent phys io graphic con di tions are iden ti fied. The zon ing of Geor gia was car ried out ac cord ing to the rate of changes in the num ber of hot days. The re sults en hance the un der stand ing of cli mate change in Geor gia un der global warm ing con ditions.

Russian Meteorology and Hydrology, 2016

Ab stract-The orig i nal method de vel oped in the Voeikov Main Geo phys i cal Ob ser va tory is ... more Ab stract-The orig i nal method de vel oped in the Voeikov Main Geo phys i cal Ob ser va tory is used for as sess ing the po ten tial of re new able en ergy re sources of Geor gia. The cu mu la tive in dex of po ten tial energy re sources and their con stit u ents (helio, wind, and wa ter re sources) are es ti mated quan ti ta tively in con ven tional units for the re gions of Geor gia. The re spec tive geoinformation maps are com piled.

Russian Meteorology and Hydrology, 2016

Ab stract-Using ob ser va tional data from 50 weather sta tions in Geor gia for the pe riod of 19... more Ab stract-Using ob ser va tional data from 50 weather sta tions in Geor gia for the pe riod of 1936-2013, the fol low ing cli mate in di ces of mois ture re gime are stud ied: max i mum 1-day pre cip i ta tion, max i mum 5-day pre cip i ta tion, the sim ple daily in ten sity in dex, the num ber of days with pre cip i ta tion equal to not less than 10, 20, and 50 mm, num ber of con sec u tive wet and dry days. Geoinformation maps of the spatial struc ture are plot ted, and the dy nam ics of these in di ces is stud ied for the pe riod of global warm ing. Ex pected changes in the mois ture re gime in dif fer ent phys io graphic re gions in Geor gia are as sessed.

Russian Meteorology and Hydrology, 2007

The dynamics of the occurrence frequency of extreme anomalies of monthly mean air temperature and... more The dynamics of the occurrence frequency of extreme anomalies of monthly mean air temperature and its effect on precipitation and river water discharge in the 20th century are studied using weather observations at 40 stations and data on the hydrological regime of 34 rivers in Georgia.

Climate Indices for the Moistening Regimen in the Territory of Georgia amidst Global Warming

Based on the observation materials from 50 weather stations in Georgia for the period of 1936-201... more Based on the observation materials from 50 weather stations in Georgia for the period of 1936-2011, this article explores climate indices for the moistening regimen - the mean of maximum 24-hour precipitation, rainless and rainy periods. The author constructs geoinformation maps for the spatial structure and explores the dynamics of these indices for the period of global warming, assesses the possible risks of the development of adverse climate conditions (high waters, floods, droughts, desertification). The obtained findings can be used in the summation of corresponding indices for the Caucasus region, the Black Sea area, and Western Asia.

Creation of high-resolution climatic grid datasets for the territory of Georgia

Russian Meteorology and Hydrology, 2013

ABSTRACT Created are the grid datasets of monthly mean and annual mean temperature as well of mon... more ABSTRACT Created are the grid datasets of monthly mean and annual mean temperature as well of monthly, seasonal, and annual values of the total precipitation with the resolution of 25 km for the period of 1936–2011. The obtained datasets characterize the real picture of the spatial distribution of temperature and precipitation on the territory of Georgia; therefore, they are used for working out geoinformative maps of temperature and precipitation variations. Revealed are the areas and centers with different intensity of warming and cooling. It is found that the annual temperature and total annual precipitation averaged for the territory do not vary considerably under conditions of the global warming.

Russian Meteorology and Hydrology, 2012

The peculiarities of wire icing in mountain areas of Georgia are investigated using the observati... more The peculiarities of wire icing in mountain areas of Georgia are investigated using the observational data of 14 meteorological stations of Georgia. Determined are the maximum frequency and the maximum mass of glaze-ice deposits, as well as the frequency of deposits of different mass and thickness. Considered are the effects of orography and meteorological conditions on the wire icing processes.

Hurricane winds on the territory of Georgia

Russian Meteorology and Hydrology, 2013

ABSTRACT The statistical structure of hurricane winds is studied using the data of observation at... more ABSTRACT The statistical structure of hurricane winds is studied using the data of observation at 50 meteorological stations in Georgia for the period of 1961–2008. Determined are the number of days and the duration of hurricane winds in different regions of the country. Studied are the empirical functions of their distribution and the areal limits.

Geography and dynamics of some temperature indices for assessing the climate change in Georgia

Russian Meteorology and Hydrology, 2015

Russian Meteorology and Hydrology, 2009

Frequency of occurrence and dynamics of droughts in 20th century were studied based on the observ... more Frequency of occurrence and dynamics of droughts in 20th century were studied based on the observational materials of 20 meteorological stations of Eastern Georgia. The periods with precipitation deficit were studied against the background of high temperatures. The drought intensity was assessed with the Selyaninov hydrothermal coefficient.

Climate dynamics of glaciers of the Greater Caucasus for the 20th century

Russian Meteorology and Hydrology, 2009

Russian Meteorology and Hydrology, 2012

The statistical structure of dangerous fogs with the visibility of less than 50 m is studied usin... more The statistical structure of dangerous fogs with the visibility of less than 50 m is studied using the observation data of 50 meteorological stations in Georgia for the period of 1961-2006. The contribution of dangerous fogs to the total number of foggy days is estimated. The number of days with dangerous fogs and their duration in different regions of the country are determined and the empirical functions of their distribution, sizes of areas of their expansion, temperature regime, and peculiarities of annual variations are studied.

Air temperature trends in Georgia under global warming conditions

Russian Meteorology and Hydrology, 2013

ABSTRACT Air temperature trends under conditions of global warming are studied using the observat... more ABSTRACT Air temperature trends under conditions of global warming are studied using the observational data from 87 meteorological stations of Georgia for the period of 1936–2011. Plotted are the geographic information maps of the spatial structure of temperature variation rate.

მეტეოროლოგიური დაკვირვებები იაკობ გოგებაშვილის სახელობის თელავის სახელმწიფო უნივერსიტეტის ავტომატურ მეტეოსადგურზე

Modeling of the Stochastic Process of Joint Implementation of Various Dangerous and Catastrophic Meteorological Phenomena

წარმოდგენილია საშიში და კატასტროფული მეტეოროლოგიური მოვლენების ერთდროული რეალიზაციის მოდელირების ... more წარმოდგენილია საშიში და კატასტროფული მეტეოროლოგიური მოვლენების ერთდროული რეალიზაციის მოდელირების კონცეფცია. განხილულია მოდელირების რამოდენიმე ვარიანტი.The concept of modeling the joint implementation of hazardous and catastrophic meteorological phenomena is presented. Several modeling options are considered

Assessment of Climatic Risks from Hazardous Weather Phenomena

Droughts, strong winds, hurricanes, torrential rains, hail, floods, floods, blizzards, extreme te... more Droughts, strong winds, hurricanes, torrential rains, hail, floods, floods, blizzards, extreme temperatures, and other similar disasters cause more severe economic losses than volcanic eruptions, tsunamis, and earthquakes, and these hazards pose climate risks. The main factors of the process of occurrence of climatic risk of dangerous meteorological phenomena are considered. The article describes a methodology for assessing the vulnerability of objects (risk recipients) exposed to hazardous phenomena. On the example of two points located in different geographical conditions - Tbilisi and Dmanisi, possible social and economic risks associated with these phenomena are identified. The greatest climatic danger is represented by fog and strong winds, and in summer, Tbilisi is very hot with concomitant soil, atmospheric drought, and extreme fire hazards. To a lesser extent, the area is damaged by heavy rainfall and hail

Based on the materials of observation of 50 meteorological stations of Georgia for the period bet... more Based on the materials of observation of 50 meteorological stations of Georgia for the period between 1936-2013, research has been made of geography, structure, intensity, duration and dynamics of tropical nights on the Georgian territory. Nights are considered tropical if minimum air temperature is above 20°C (TR20). Tropical nights are most widespread in the intermountain trough – Kolkheti lowland, the plains of Central and Lower Kartli, Alazani valley, where the average number of tropical nights during one year reaches 35. With the growth of altitude, the number of tropical nights naturally decreases, and on the height of 1000m there are no tropical nights detected. As a result of global warming the increase in the number of tropical nights has been most notable on the Black Sea coast and in the region of the nearby Kolkheti lowland (4-6 days per decade). In the internal regions of the lowland and in the Eastern Georgia the rate of change decreases. On the Black Sea coast tropica...

Russian Meteorology and Hydrology, 2020

High-dimensional gene expression data provide a rich source of information because they capture t... more High-dimensional gene expression data provide a rich source of information because they capture the expression level of genes in dynamic states that reflect the biological functioning of a cell. For this reason, such data are suitable to reveal systems related properties inside a cell, e.g., in order to elucidate molecular mechanisms of complex diseases like breast or prostate cancer. However, this is not only strongly dependent on the sample size and the correlation structure of a data set, but also on the statistical hypotheses tested. Many different approaches have been developed over the years to analyze gene expression data to (I) identify changes in single genes, (II) identify changes in gene sets or pathways, and (III) identify changes in the correlation structure in pathways. In this paper, we review statistical methods for all three types of approaches, including subtypes, in the context of cancer data and provide links to software implementations and tools and address also the general problem of multiple hypotheses testing. Further, we provide recommendations for the selection of such analysis methods. Reviewers: This article was reviewed by Arcady Mushegian, Byung-Soo Kim and Joel Bader.

Russian Meteorology and Hydrology, 2019

Based on observational data from 25 weather stations for the period of 1936-2013, the statistical... more Based on observational data from 25 weather stations for the period of 1936-2013, the statistical structure, intensity, and duration of frosts as well as the dynamics of the number of frost days in the mountain regions of Georgia are investigated. The continuous duration of frosts, the time of the occurrence, the frequency of different gradations of the number of frost days, and the regularities of their long-term variations are revealed.

Tropical Nights in Georgia

Russian Meteorology and Hydrology, 2018

Based on observational data from 30 weather stations in Georgia for the period of 1936–2013, the ... more Based on observational data from 30 weather stations in Georgia for the period of 1936–2013, the geography, statistical structure, intensity, duration, and dynamics of tropical nights are investigated. The geoinformation map was constructed for the number of tropical nights for the WMO base period. The periods of occurrence and return of their different gradations and the regularities of long-term variations are revealed.

Russian Meteorology and Hydrology, 2017

Ab stract-Vari a tions in the num ber of hot days, their fre quency, in ten sity, and du ra tion ... more Ab stract-Vari a tions in the num ber of hot days, their fre quency, in ten sity, and du ra tion in Geor gia are stud ied us ing ob ser va tional data from 50 weather sta tions for the pe riod of 1936-2013. The pe ri ods of the on set of hot days in the year and their max i mum in ten sity in dif fer ent phys io graphic con di tions are iden ti fied. The zon ing of Geor gia was car ried out ac cord ing to the rate of changes in the num ber of hot days. The re sults en hance the un der stand ing of cli mate change in Geor gia un der global warm ing con ditions.

Russian Meteorology and Hydrology, 2016

Ab stract-The orig i nal method de vel oped in the Voeikov Main Geo phys i cal Ob ser va tory is ... more Ab stract-The orig i nal method de vel oped in the Voeikov Main Geo phys i cal Ob ser va tory is used for as sess ing the po ten tial of re new able en ergy re sources of Geor gia. The cu mu la tive in dex of po ten tial energy re sources and their con stit u ents (helio, wind, and wa ter re sources) are es ti mated quan ti ta tively in con ven tional units for the re gions of Geor gia. The re spec tive geoinformation maps are com piled.

Russian Meteorology and Hydrology, 2016

Ab stract-Using ob ser va tional data from 50 weather sta tions in Geor gia for the pe riod of 19... more Ab stract-Using ob ser va tional data from 50 weather sta tions in Geor gia for the pe riod of 1936-2013, the fol low ing cli mate in di ces of mois ture re gime are stud ied: max i mum 1-day pre cip i ta tion, max i mum 5-day pre cip i ta tion, the sim ple daily in ten sity in dex, the num ber of days with pre cip i ta tion equal to not less than 10, 20, and 50 mm, num ber of con sec u tive wet and dry days. Geoinformation maps of the spatial struc ture are plot ted, and the dy nam ics of these in di ces is stud ied for the pe riod of global warm ing. Ex pected changes in the mois ture re gime in dif fer ent phys io graphic re gions in Geor gia are as sessed.

Russian Meteorology and Hydrology, 2007

The dynamics of the occurrence frequency of extreme anomalies of monthly mean air temperature and... more The dynamics of the occurrence frequency of extreme anomalies of monthly mean air temperature and its effect on precipitation and river water discharge in the 20th century are studied using weather observations at 40 stations and data on the hydrological regime of 34 rivers in Georgia.

Climate Indices for the Moistening Regimen in the Territory of Georgia amidst Global Warming

Based on the observation materials from 50 weather stations in Georgia for the period of 1936-201... more Based on the observation materials from 50 weather stations in Georgia for the period of 1936-2011, this article explores climate indices for the moistening regimen - the mean of maximum 24-hour precipitation, rainless and rainy periods. The author constructs geoinformation maps for the spatial structure and explores the dynamics of these indices for the period of global warming, assesses the possible risks of the development of adverse climate conditions (high waters, floods, droughts, desertification). The obtained findings can be used in the summation of corresponding indices for the Caucasus region, the Black Sea area, and Western Asia.

Creation of high-resolution climatic grid datasets for the territory of Georgia

Russian Meteorology and Hydrology, 2013

ABSTRACT Created are the grid datasets of monthly mean and annual mean temperature as well of mon... more ABSTRACT Created are the grid datasets of monthly mean and annual mean temperature as well of monthly, seasonal, and annual values of the total precipitation with the resolution of 25 km for the period of 1936–2011. The obtained datasets characterize the real picture of the spatial distribution of temperature and precipitation on the territory of Georgia; therefore, they are used for working out geoinformative maps of temperature and precipitation variations. Revealed are the areas and centers with different intensity of warming and cooling. It is found that the annual temperature and total annual precipitation averaged for the territory do not vary considerably under conditions of the global warming.

Russian Meteorology and Hydrology, 2012

The peculiarities of wire icing in mountain areas of Georgia are investigated using the observati... more The peculiarities of wire icing in mountain areas of Georgia are investigated using the observational data of 14 meteorological stations of Georgia. Determined are the maximum frequency and the maximum mass of glaze-ice deposits, as well as the frequency of deposits of different mass and thickness. Considered are the effects of orography and meteorological conditions on the wire icing processes.

Hurricane winds on the territory of Georgia

Russian Meteorology and Hydrology, 2013

ABSTRACT The statistical structure of hurricane winds is studied using the data of observation at... more ABSTRACT The statistical structure of hurricane winds is studied using the data of observation at 50 meteorological stations in Georgia for the period of 1961–2008. Determined are the number of days and the duration of hurricane winds in different regions of the country. Studied are the empirical functions of their distribution and the areal limits.

Geography and dynamics of some temperature indices for assessing the climate change in Georgia

Russian Meteorology and Hydrology, 2015

Russian Meteorology and Hydrology, 2009

Frequency of occurrence and dynamics of droughts in 20th century were studied based on the observ... more Frequency of occurrence and dynamics of droughts in 20th century were studied based on the observational materials of 20 meteorological stations of Eastern Georgia. The periods with precipitation deficit were studied against the background of high temperatures. The drought intensity was assessed with the Selyaninov hydrothermal coefficient.

Climate dynamics of glaciers of the Greater Caucasus for the 20th century

Russian Meteorology and Hydrology, 2009

Russian Meteorology and Hydrology, 2012

The statistical structure of dangerous fogs with the visibility of less than 50 m is studied usin... more The statistical structure of dangerous fogs with the visibility of less than 50 m is studied using the observation data of 50 meteorological stations in Georgia for the period of 1961-2006. The contribution of dangerous fogs to the total number of foggy days is estimated. The number of days with dangerous fogs and their duration in different regions of the country are determined and the empirical functions of their distribution, sizes of areas of their expansion, temperature regime, and peculiarities of annual variations are studied.

Air temperature trends in Georgia under global warming conditions

Russian Meteorology and Hydrology, 2013

ABSTRACT Air temperature trends under conditions of global warming are studied using the observat... more ABSTRACT Air temperature trends under conditions of global warming are studied using the observational data from 87 meteorological stations of Georgia for the period of 1936–2011. Plotted are the geographic information maps of the spatial structure of temperature variation rate.