Aritina Haliuc | Stefan cel Mare University of Suceava (original) (raw)

Uploads

Papers by Aritina Haliuc

This study presents the meteorological information spanning the last two decades of the end of 19... more This study presents the meteorological information spanning the last two decades of the end of 19th century (1880-1900) extracted from three Romanian newspapers (România Liberă, Gazeta de Transilvania and Foaia Poporului). It describes the characteristics of the newspaper data included in the database, it offers and overview of the meteorological network and climate picture at that time in Romania and discuss some of the climatic features that can be extracted from the database as potential information for further reconstructions.

Scientific Annals of Stefan cel Mare University of Suceava. Geography Series, 2012

Geophysical Research Abstracts, Vol. 17, EGU2015-518

Annually laminated sediments are unique continental archives holding essential paleoenvironmental... more Annually laminated sediments are unique continental archives holding essential paleoenvironmental and paleoclimatic information providing the opportunity (i) to evaluate the climate variability at inter-annual to decadal scale and (ii) to construct independent and reliable chronologies. Lake Haemelsee in northern Germany (19.5 m a.s.l) is a key site for tracing high-resolution climatic and environmental evolution in W Europe because of its partly varved sediments. Here, we apply lithostratigraphical, geochemical and micro-facies analyses for the bottom sediments (~1700 to 1300 cm sediment depth) in order to investigate the driving mechanisms, timing and amplitude of Lateglacial abrupt climate changes to the onset of the Holocene warming. Detailed investigation includes micro-facies analyses on petrographic thin sections combined with high-resolution µ-XRF element scanning on both fresh sediment core halves (200 µm resolution) and impregnated sediment blocks (50µm resolution). Based on these analyses, the sediment composite profile (378 cm) has been divided in ten lithozones, each exhibiting different sedimentation modes in response to regional and local climatic and environmental changes. Micro-facies analyses revealed that sediments consist of organic matter, siderite, calcite, clay/silt and sand. The basal sediments consist of glacio-fluvial material. Fine laminations are best preserved in lithozone 5 (1522-1573 cm), where minima in element proxies for detrital sediments (Ti, K, Si) and maxima in Fe and Mn indicate the prevalence of anoxic meromictic conditions. Three different varve facies types were distinguished: i) the clastic-organic varves are specific for the intervals 1571-1573 cm and 1536-1541 cm; ii) calcite/siderite-organic varves appear between 1568-1571 and 1541-1545 cm; iii) the siderite-organic varves are characteristic for the middle of the lithozone 5 spanning from 1545-1568 cm. These changes in varve facies reflect the complex answer of sedimentary conditions to climatic changes during Allerød and Allerød/Younger Dryas transition. An increased detrital sediment flux characterizes lithozone 6 and, most probably reflects the Younger Dryas cold interval. This interpretation is supported by the late Allerød Laacher See Tephra, an important chronostratigraphic marker horizon to link the floating 625 varve year chronology for the Allerød interstadial to an absolute time scale. Also, the preliminary pollen data provided the biostratigraphical information for establishing the lateglacial boundaries. Poorly preserved organic laminas are characteristic for lithozone 7 (1445-1474 cm). Our preliminary results demonstrate that the lake system responded sensitively to rapid and short-term climatic changes and these responses are well-expressed in sedimentological and geochemical variability.

Abstracts of European Geosciences Union (EGU) General Assembly

Concerns about current and prospective environmental change have increased the interest in past c... more Concerns about current and prospective environmental change have increased the interest in past climate variability and its impact on the bio-hydro-atmosphere and human society. Acting as high-resolution terrestrial archives, lacustrine sediments are the result of the complex interaction between internal and external forcing and an important tool in efforts to resolve questions related to the palaeoclimatic and palaeoenvironmental conditions of the recent past.

Lake sediments act as high-resolution archives of past climate and environments, able to record n... more Lake sediments act as high-resolution archives of past climate and environments, able to record natural and anthropogenic driven changes, and their effects on the ecosystem. Here we discuss a new lacustrine record from Lake Ighiel (924 m a.s.l.), located in Apuseni Mountains, in an attempt to reconstruct the lacustrine dynamics over the last 6000 years and identify the main processes, which controlled the depositional system during specific phases of lake evolution. Based on 210 Pb and 14 C dating, X-ray fluorescence scanning (μ-XRF) measurements, long-core sedimentary logging and environmental magnetic proxies (susceptibility, natural and induced remanences) we discuss the following points: i) the characteristics of main lacustrine sedimentation phases; ii) the amplitude and interplay of processes controlling the depositional environment through time; iii) contribution of hydroclimatic forcing in explaining changes in the nature of lacustrine deposition.

Fire is an important disturbance agent worldwide and one of the major causes of geomorphological ... more Fire is an important disturbance agent worldwide and one of the major causes of geomorphological change. Dependent on its characteristics (size, duration, temperature), fire induces changes in soil stability, modifying infiltration and promoting soil erosion. Here, we employ a suite of physical (mineral magnetic, loss-on-ignition), geochemical (XRF derived elemental data), biological (macro-charcoal, pollen) proxies and dating measurements (AMS 14 C, 210 Pb and 137 Cs) to examine the relationship between fire activity, sedimentary characteristics and geomorphological change over the Holocene. Our results highlight that fire events imprint a magnetic signature characterised by secondary ferrimagnetic assemblage particularly very fine superparamagnetic (SP) magnetite and maghemite. In Lake Buhăiescu Mare, the early Holocene is characterised by moderate fire activity and coarser sediment particle size indicating a relatively unstable catchment affected by burning events which activated erosional processes. Subsequently, the late Holocene (4,000–0 cal yr. BP) is marked by intermittently variable fire activity with sporadic increases between 3,400 and 3,200 cal yr. BP and around 2,000 cal yr. BP when burning was strong enough to lead to the magnetic enrichment of topsoil and detrital inputs to the lake. In our high resolution record, Lake Știol, the interval 2,500–700 cal yr. BP, and also the last 100 years, are characterised by intense burning that coincides with sustained surface soil erosion and magnetic enrichment. The fire–erosion–landscape relationship varies over time being highly dependent on fire behaviour, fire temporal and spatial distribution and landscape features (slope, soil type, vegetation cover).

Conferences by Aritina Haliuc

This study presents the meteorological information spanning the last two decades of the end of 19... more This study presents the meteorological information spanning the last two decades of the end of 19th century (1880-1900) extracted from three Romanian newspapers (România Liberă, Gazeta de Transilvania and Foaia Poporului). It describes the characteristics of the newspaper data included in the database, it offers and overview of the meteorological network and climate picture at that time in Romania and discuss some of the climatic features that can be extracted from the database as potential information for further reconstructions.

Scientific Annals of Stefan cel Mare University of Suceava. Geography Series, 2012

Geophysical Research Abstracts, Vol. 17, EGU2015-518

Annually laminated sediments are unique continental archives holding essential paleoenvironmental... more Annually laminated sediments are unique continental archives holding essential paleoenvironmental and paleoclimatic information providing the opportunity (i) to evaluate the climate variability at inter-annual to decadal scale and (ii) to construct independent and reliable chronologies. Lake Haemelsee in northern Germany (19.5 m a.s.l) is a key site for tracing high-resolution climatic and environmental evolution in W Europe because of its partly varved sediments. Here, we apply lithostratigraphical, geochemical and micro-facies analyses for the bottom sediments (~1700 to 1300 cm sediment depth) in order to investigate the driving mechanisms, timing and amplitude of Lateglacial abrupt climate changes to the onset of the Holocene warming. Detailed investigation includes micro-facies analyses on petrographic thin sections combined with high-resolution µ-XRF element scanning on both fresh sediment core halves (200 µm resolution) and impregnated sediment blocks (50µm resolution). Based on these analyses, the sediment composite profile (378 cm) has been divided in ten lithozones, each exhibiting different sedimentation modes in response to regional and local climatic and environmental changes. Micro-facies analyses revealed that sediments consist of organic matter, siderite, calcite, clay/silt and sand. The basal sediments consist of glacio-fluvial material. Fine laminations are best preserved in lithozone 5 (1522-1573 cm), where minima in element proxies for detrital sediments (Ti, K, Si) and maxima in Fe and Mn indicate the prevalence of anoxic meromictic conditions. Three different varve facies types were distinguished: i) the clastic-organic varves are specific for the intervals 1571-1573 cm and 1536-1541 cm; ii) calcite/siderite-organic varves appear between 1568-1571 and 1541-1545 cm; iii) the siderite-organic varves are characteristic for the middle of the lithozone 5 spanning from 1545-1568 cm. These changes in varve facies reflect the complex answer of sedimentary conditions to climatic changes during Allerød and Allerød/Younger Dryas transition. An increased detrital sediment flux characterizes lithozone 6 and, most probably reflects the Younger Dryas cold interval. This interpretation is supported by the late Allerød Laacher See Tephra, an important chronostratigraphic marker horizon to link the floating 625 varve year chronology for the Allerød interstadial to an absolute time scale. Also, the preliminary pollen data provided the biostratigraphical information for establishing the lateglacial boundaries. Poorly preserved organic laminas are characteristic for lithozone 7 (1445-1474 cm). Our preliminary results demonstrate that the lake system responded sensitively to rapid and short-term climatic changes and these responses are well-expressed in sedimentological and geochemical variability.

Abstracts of European Geosciences Union (EGU) General Assembly

Concerns about current and prospective environmental change have increased the interest in past c... more Concerns about current and prospective environmental change have increased the interest in past climate variability and its impact on the bio-hydro-atmosphere and human society. Acting as high-resolution terrestrial archives, lacustrine sediments are the result of the complex interaction between internal and external forcing and an important tool in efforts to resolve questions related to the palaeoclimatic and palaeoenvironmental conditions of the recent past.

Lake sediments act as high-resolution archives of past climate and environments, able to record n... more Lake sediments act as high-resolution archives of past climate and environments, able to record natural and anthropogenic driven changes, and their effects on the ecosystem. Here we discuss a new lacustrine record from Lake Ighiel (924 m a.s.l.), located in Apuseni Mountains, in an attempt to reconstruct the lacustrine dynamics over the last 6000 years and identify the main processes, which controlled the depositional system during specific phases of lake evolution. Based on 210 Pb and 14 C dating, X-ray fluorescence scanning (μ-XRF) measurements, long-core sedimentary logging and environmental magnetic proxies (susceptibility, natural and induced remanences) we discuss the following points: i) the characteristics of main lacustrine sedimentation phases; ii) the amplitude and interplay of processes controlling the depositional environment through time; iii) contribution of hydroclimatic forcing in explaining changes in the nature of lacustrine deposition.

Fire is an important disturbance agent worldwide and one of the major causes of geomorphological ... more Fire is an important disturbance agent worldwide and one of the major causes of geomorphological change. Dependent on its characteristics (size, duration, temperature), fire induces changes in soil stability, modifying infiltration and promoting soil erosion. Here, we employ a suite of physical (mineral magnetic, loss-on-ignition), geochemical (XRF derived elemental data), biological (macro-charcoal, pollen) proxies and dating measurements (AMS 14 C, 210 Pb and 137 Cs) to examine the relationship between fire activity, sedimentary characteristics and geomorphological change over the Holocene. Our results highlight that fire events imprint a magnetic signature characterised by secondary ferrimagnetic assemblage particularly very fine superparamagnetic (SP) magnetite and maghemite. In Lake Buhăiescu Mare, the early Holocene is characterised by moderate fire activity and coarser sediment particle size indicating a relatively unstable catchment affected by burning events which activated erosional processes. Subsequently, the late Holocene (4,000–0 cal yr. BP) is marked by intermittently variable fire activity with sporadic increases between 3,400 and 3,200 cal yr. BP and around 2,000 cal yr. BP when burning was strong enough to lead to the magnetic enrichment of topsoil and detrital inputs to the lake. In our high resolution record, Lake Știol, the interval 2,500–700 cal yr. BP, and also the last 100 years, are characterised by intense burning that coincides with sustained surface soil erosion and magnetic enrichment. The fire–erosion–landscape relationship varies over time being highly dependent on fire behaviour, fire temporal and spatial distribution and landscape features (slope, soil type, vegetation cover).