Iulian HolobacaBabeş-Bolyai University | UBB · Faculty of Geography
Iulian Holobaca
phd
About
62
Publications
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929
Citations
Citations since 2017
Introduction
Additional affiliations
October 1998 - present
Education
October 1997 - October 2013
Publications
Publications (62)
In 2015, the 2030 Agenda for Sustainable Development was adopted by all United Nations Member States and includes a set of 17 Sustainable Development Goals. The indicator, “Ratio of land consumption rate to population growth rate” (indicator 11.3.1) was proposed for the monitoring of urban development. The present study proposes the analysis of the...
We reconstruct snow-avalanche (SA) activity along three adjacent avalanche paths in the northern part of the Rodna Mountains (Eastern Carpathians, Romania) using tree-ring analyses. We sampled a total of 238 disturbed Norway spruce (Picea abies (L.) Karst.) trees and used the growth anomalies found in tree rings to obtain an avalanche chronology at...
Background and aim
The associations between COVID-19 transmission and meteorological factors are scientifically debated. Several studies have been conducted worldwide, with inconsistent findings. However, often these studies had methodological issues, e.g., did not exclude important confounding factors, or had limited geographic or temporal resolut...
Rationale:
The associations between ambient coarse particulate matter (PM2.5-10) and daily mortality is not fully understood at a global scale.
Objectives:
To evaluate the short-term associations between PM2.5-10 and total, cardiovascular, and respiratory mortality across multiple countries/regions worldwide.
Methods:
We collected daily mortal...
This paper explores the snow-avalanche regime based on tree-ring reconstructions and their triggering weather conditions with classification tree algorithms.
The results show a significant increased frequency of avalanche events on Zăvoaie NE slope for the second half of the 20th century by comparison to the Scărița SW slope. The classification tre...
Background
Increased mortality risk is associated with short-term temperature variability. However, to our knowledge, there has been no comprehensive assessment of the temperature variability-related mortality burden worldwide. In this study, using data from the MCC Collaborative Research Network, we first explored the association between temperatu...
Epidemiological analyses of health risks associated with non-optimal temperature are traditionally based on ground observations from weather stations that offer limited spatial and temporal coverage. Climate reanalysis represents an alternative option that provide complete spatio-temporal exposure coverage, and yet are to be systematically explored...
Studies have investigated the effects of heat and temperature variability (TV) on mortality. However, few assessed whether TV modifies the heat-mortality association. Data on daily temperature and mortality in the warm season were collected from 717 locations across 36 countries. TV was calculated as the standard deviation of the average of the sam...
What this study adds The minimum mortality temperature (MMT) is an important indicator of the relationship between temperature and mortality. It indicates the adaptability to climate, but little is known about its geographical changes in the global distribution. This article investigates the geographic differences of the MMT on a global scale and s...
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Background
Many regions of the world are now facing more frequent and unprecedentedly large wildfires. However, the association between wildfire-related PM2·5 and mortality has not been well characterised. We aimed to comprehensively assess the association between short-term exposure to wildfire-related PM2·5 and mortality across various regions of...
Background:
Minimum mortality temperature (MMT) is an important indicator to assess the temperature-mortality association, indicating long-term adaptation to local climate. Limited evidence about the geographical variability of the MMT is available at a global scale.
Methods:
We collected data from 658 communities in 43 countries under different...
Background
Exposure to cold or hot temperatures is associated with premature deaths. We aimed to evaluate the global, regional, and national mortality burden associated with non-optimal ambient temperatures.
Methods
In this modelling study, we collected time-series data on mortality and ambient temperatures from 750 locations in 43 countries and f...
Climate change affects human health; however, there have been no large-scale, systematic efforts to quantify the heat-related human health impacts that have already occurred due to climate change. Here, we use empirical data from 732 locations in
43 countries to estimate the mortality burdens associated with the additional heat exposure that has re...
Global warming is causing glaciers in the Caucasus Mountains and around the world to lose mass at an accelerated pace. As a result of this rapid retreat, significant parts of the glacierized surface area can be covered with debris deposits, often making them indistinguishable from the surrounding land surface by optical remote-sensing systems. Here...
Global warming is causing glaciers in the Caucasus Mountains and around the world to lose mass
at an accelerated pace. As a result of this rapid retreat, significant parts of the glacierized surface
area can be covered with debris deposits, often making them indistinguishable from the surrounding
land surface by optical remote-sensing systems. Here...
Background:
Epidemiological evidence on short-term association between ambient carbon monoxide (CO) and mortality is inconclusive and limited to single cities, regions, or countries. Generalisation of results from previous studies is hindered by potential publication bias and different modelling approaches. We therefore assessed the association be...
Background: Epidemiological evidence on short-term association between ambient carbon monoxide (CO) and mortality is inconclusive and limited to single cities, regions, or countries. Generalisation of results from previous studies is hindered by potential publication bias and different modelling approaches. We therefore assessed the association bet...
Objective
To evaluate the short term associations between nitrogen dioxide (NO 2 ) and total, cardiovascular, and respiratory mortality across multiple countries/regions worldwide, using a uniform analytical protocol.
Design
Two stage, time series approach, with overdispersed generalised linear models and multilevel meta-analysis.
Setting
398 cit...
In order to measure progress in achieving the Sustainable Development Goals (SDGs) by 2030, 169 targets have been approved globally. Even though interest in implementing these goals is high, many states have not yet established a set of subnational indicators to measure the implementation of the SDGs and have not completed their own assessment of p...
The aim of the paper is to develop a model for the real-time estimation of local level income data by combining machine learning, Earth Observation, and Geographic Information System. More exactly, we estimated the income per capita by help of a machine learning model for 46 cities with more than 50,000 inhabitants, based on the National Polar-orbi...
Aims
We aimed to investigate the heterogeneity of seasonal suicide patterns among multiple geographically, demographically and socioeconomically diverse populations.
Methods
Weekly time-series data of suicide counts for 354 communities in 12 countries during 1986–2016 were analysed. Two-stage analysis was performed. In the first stage, a generalis...
Résumé : Les avalanches de neige représentent un aléa majeur sur les versants pentus des Monts Maramureş (Carpates Orientales Roumaines), mais reste très peu connu dans ces montagnes. En l’absence des sources documentaires d’information sur l’activité avalancheuse dans le passé, on peut recourir à des sources indirectes d’information, comme par exe...
Since the end of the Little Ice Age (LIA) glacial advance, mountain glaciers of temperate zone have experienced an accelerated retreat accompanied by an increased production, transport and accumulation of glacial sediments. In these deglacierized areas, the development of a chronology for sediment deposition in the glacier forefronts remains challe...
Night-time lights satellite images provide a new opportunity to measure regional inequality in real-time by developing the Night Light Development Index (NLDI). The NLDI was extracted using the Gini coefficient approach based on population and night light spatial distribution in Romania. Night-time light data were calculated using a grid with a 0.1...
Urban areas are continuously expanding, against the background of accelerating urbanization, while their correct detection might be useful in a wide range of applications in urban planning and environmental studies. The paper proposes the development of a new method for the detection of the built-up areas based on SAR (Synthetic Aperture Radar) dat...
Dans notre étude, nous avons mis en relation les données dendrochronologiques avec 50 variables climatiques mensuelles (1961 - 2015) en utilisant la régression multiple. Le couloir d’avalanches investigué est situé dans la partie ouest des Monts Parâng (Carpates Méridionales, Roumanie), à proximité de la station météorologique Parângul Mic. A parti...
Tree-ring analyses were applied in this study, in order to document the spatial–temporal distribution of the past snow avalanche activity along two adjacent avalanche paths in Piatra Craiului Mountains (Southern Carpathians, Romania). The dendrogeomorphic reconstruction performed on 235 Picea abies (L.) Karst. trees is based on the analysis of the...
L'investigation de l'îlot de chaleur urbain est un sujet important dans la climatologie urbaine à cause de son caractère appliqué. Dans cette étude nous présentons les observations de l'ICU qui ont permis l'identification objective des points d'observation automatique en Cluj-Napoca, Roumanie. La représentativité spatiale des observations manuelles...
The glacier system covering Europe's highest mountain, Elbrus, has exhibited an accelerated retreat since 1980. Some studies have related this retreat to a significant summer temperature increasing trend. Relief- and aspect-related parameters for the glacierized area have an important impact on glacier changes. In this paper, the changes in glacier...
A large number of studies have shown that precipitation have a spatial and temporal variability higher than temperature. The importance of the analysis regarding this topic emerges from the fact that the spatial-temporal variability of the atmospheric precipitation has a strong impact upon the environment and human society. The aim of this study is...
Snow avalanches are common processes on steep slopes of the alpine and subalpine belts in Parâng Mountains (Southern Carpathians, Romania). The increasing tourism activities in these high mountain areas expose tourists to a high level of hazard especially in the avalanche prone areas, where the past avalanche activity is poorly documented. Snow ava...
Recent evidence suggests an acceleration of the glacier retreat in the Greater Caucasus after 1980. A significant summer temperature warming trend and little or no change in precipitation variation have been observed during the same period. This study aims to find similar past climatic conditions after the Little Ice Age (LIA) using a dendroclimati...
This paper focuses on the testing and comparison of the sensitivity of vegetation indices to determine the changes occurred in forest areas of the Cluj Forest District during the post-socialist period, between 1986 and 2009. Concurrently, the paper pursues to assess the way in which the socio-economic and social changes have caused alterations of t...
Change detection using multi-temporal satellite images data is an important do-main with various applications in forestry and can allow an evaluation of areas extended to the same spatial temporal scale. The focus of the study is to assess the changes occurring after catas-trophic wind events using Landsat time series data. Estimates of disturbance...
The changes in land cover in southwest Romania could affect the low frequency cycle of precipitation regime through changes in ground water stress and atmospheric circulation. Monitoring these changes using satellite images has been proved less expensive, as well as more reliable compared to conventional methods. The 50 ha of walnuts plantation, wh...
A significant summer temperature warming trend and little or no change in precipitation variation have been observed in the southern part of the Carpathians after 1980. In this paper we seek to find similar past climatic conditions using a dendroclimatic reconstruction of summer temperatures. Regional dendroclimatic reconstruction has been conducte...
Recent evidence suggests an acceleration of glacier retreat in Greater Caucasus after 1980. For the same period a significant summer temperature warming trend and little or no change in precipitation variation have been observed. In this paper we seek to find similar past climatic conditions using a dendroclimatic reconstruction of summer temperatu...
Parâng Mountains belong to Southern Carpathians, having the maximum altitude in Parângul Mare Peak (2519 m a.s.l.). The geology is dominated by crystalline schists, due to whom the relief is characterized by steep slopes. Between 1400 – 1700 m the average annual temperature is around 2-3ᴼC and the total precipitation about 1000-1200 mm/year. Conife...
Remote-sensing based on multi-temporal satellite images has allowed us the mapping of changes in urban and peri-urban areas in order to illustrate the urban development over time. In this article we have used Landsat TM and ETM+ images for a period of time with significant changes in urban structures. On the basis of these images we have calculated...
Remote-sensing based on multi-temporal satellite images has allowed us the mapping of changes in urban and peri-urban areas in order to illustrate the urban development over time. In this article we have used Landsat TM and ETM+ images for a period of time with significant changes in urban structures. On the basis of these images we have calculated...
Fires are the most spectacular natural disturbances affecting forest ecosystem composition, having a devastating effect on the landscape. These can be monitored and analyzed over large areas in an efficient manner in a short time and at low cost by using satellite images and the affected area can be defined using satellite imagery through geographi...
Fires are the most spectacular natural disturbances affecting forest ecosystem composition, having a devastating effect on the landscape. These can be monitored and analyzed over large areas in an efficient manner in a short time and at low cost by using satellite images and the affected area can be defined using satellite imagery through geographi...
This study proposes a new method designed to assess quantitative changes in mountain glaciers. The Glacier Mapper–Change Detector method has a four-step algorithm: (i) image ratioing on two time-comparable satellite images; (ii) digitization of glacier outlines from ratio images using a threshold value; (iii) change detection using the position of...
The windthrow detection, meteorological risk factor, based on satellite imagery and the assessment of their effects. Windthrow detection has always been and still represents a problem on an economical and ecological level because of the national negative effects they have. (Popa, I., 2000). Therefore, the detection and quantitative evaluation of wo...
Climatic changes are representing one of the major challenges of our century, these being forcasted according to climate scenarios and models, which represent plausible and concrete images of future climatic conditions. The results of climate models comparison regarding future water resources and temperature regime trend can become a useful instrum...
Trees are both sensitive and adaptive to environmental change;
consequently they are often used as indicators for past climate
variability. The correlation between climate and growth of spruce (Picea
abies (L.) Karst) in Eastern Romanian Carpathians was tested by choosing
a sample site situated beneath the upper timberline (where the climatic
facto...
Air temperature variability and trends in Romania were analysed using monthly, seasonal, and annual datasets. Temperature
data of winter wheat season were also analysed. The Mann-Kendall test, Sen’s slope estimate, the sequential version of the
Mann-Kendall test, the Pettitt test and spatial and temporal hierarchical cluster analyses were used. Fir...
Characterizing climatic changes in the high altitude mountain regions helps scientists and policy makers
understand the effects of such changes on water resources, economic development, and the health of ecosystems. This paper proposes a change-point analysis to determine the time and magnitude of summer temperature changes in the summit areas of R...
Characterizing climatic changes in the high altitude mountain regions helps scientists and policy makers
understand the effects of such changes on water resources, economic development, and the health of ecosystems. This paper proposes a change-point analysis to determine the time and magnitude of summer temperature changes in the summit areas of R...
Air temperature variability and trends in Romania were analysed using monthly,
seasonal, and annual datasets. Temperature data of winter wheat season were also analysed. The
Mann-Kendall test, Sen’s slope estimate, the sequential version of the Mann-Kendall test, the
Pettitt test and spatial and temporal hierarchical cluster analyses were used. Fir...
In the present study a statistical analysis of annual, seasonal and monthly data series with number of fog days was made in order to identify the main factors, which decide the spatial variability of the phenomenon. In order to investigate the behavior of fog phenomenon in the Northwestern part of Romania, several statistical techniques were applie...
This study has as main purpose the analysis of long-term precipitations variability in Turda. The analysis is based on the time series of climatic data from Turda weather station which covers a period of 56 years (1951-2006). The non-parametric tests to determine temporal trends in climatic data sets are used. The evolution of the observed paramete...
Questions
Questions (2)
Which is the most suitable RCM output to study heat/cold waves frequency and intensity in the future?
The worldwide mountain glaciers are retreating in response to recent warming. The global climatic variability imposes the general trend but the relief parameters like altitude, slope, and aspect are very important for the glacial dynamic at local scale.
Projects
Projects (6)
Le premier objectif du colloque a été de permettre aux participants issus de cinq continents de présenter les résultats récents de leurs travaux sur l’évaluation et la mitigation des risques naturels dans le contexte d’un climat qui connaît des phénomènes extrêmes plus intenses et/ou plus fréquents. Un autre objectif important a été la reprise de contact de la communauté des climatologues de l’AIC avec les chercheurs provenant d’Europe Centrale et Orientale (ECO), dont le nombre dans l’AIC a beaucoup diminué et l’expérimentation du multilinguisme dans une manifestation scientifique.