Aristomenis P. Karageorgis

Hellenic Centre for Marine Research

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Christos Anagnostou

Hellenic Centre for Marine Research

Helen Kaberi

Hellenic Centre for Marine Research

Ch. Anagnostou

Hellenic Centre for Marine Research

Theodore D. Kanellopoulos

Hellenic Centre for Marine Research

Vasilios Kapsimalis

Hellenic Centre for Marine Research

ΕK

Εvangelia Krasakopoulou

University of the Aegean

Fotini Botsou

National and Kapodistrian University of Athens

Alexandra Pavlidou

Laboratoire d’Océanographie de Villefranche

Dimitris Velaoras

Hellenic Centre for Marine Research

G. Rousakis

Hellenic Centre for Marine Research

Cooperative Institutions

Hellenic Centre for Marine Research

156

National and Kapodistrian University of Athens

Centre National de la Recherche Scientifique

Aristotle University of Thessaloniki

National Technical University of Athens

University of the Aegean

Institute of Oceanography

Sorbonne Université

Institute of Geology and Mineral Exploration

National Institute of Oceanography and Applied Geophysics

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Geochemistry of surface sediments and heavy metal contamination assessment: Messolonghi lagoon complex, Greece

Environmental Earth Sciences (2011)

Aristomenis P. Karageorgis Andreas Sioulas Εvangelia Krasakopoulou Christos Anagnostou Georgios-Angelos Hatiris

Environmental engineering science

10.1007/s12665-011-1136-3

Cite

Citations (30)

Eco-biostratigraphic advances in late Quaternary geochronology and palaeoclimate: the marginal Gulf of Mexico analogue

Geological Quarterly (2019)

Assimina Antonarakou George Kontakiotis Aristomenis P. Karageorgis Eva Besiou Stergios D. Zarkogiannis

This study combines high-resolution planktonic foraminiferal eco-biostratigraphy and palaeoclimatic data from the high-sedimentation-rate core JPC-26 from the northwestern margin of the Gulf of Mexico (GoM). The eco-biozones recognized (GOMPFE1-12) being correlated with published Mg/Ca-based sea surface temperatures. This updated palaeoclimatic and stratigraphic reference record facilitates correlations with the Greenland ice core events and their climatic relationships, and also provides a solid stratigraphic framework for correlations with other palaeoclimatic and palaeoceanographic records in the circum-GOM/Caribbean region. This multidisciplinary approach underlines the utility of supporting conventional dating methodologies with different constraints, and further reveals a powerful tool for reliably correlating marine records between comparable deep-sea marginal settings and coeval sequences of this region

Biozone

Geochronology

Radiometric dating

Chronostratigraphy

Margin (machine learning)

10.7306/gq.1457

Cite

Citations (17)

Sedimentology and geochemistry of surface sediments from the Pagassitikos Gulf

Aristomenis P. Karageorgis Andreas Sioulas Christos Anagnostou

10.1594/pangaea.711561

Cite

Citations (0)

Estimation of the particle size distribution slope with three methods: implications for the optical backscattering ratio and the bulk refractive index

Spyridon Chaikalis Nektarios Spyridakis Stylliani Psarra Aristomenis P. Karageorgis Πάνος Δρακόπουλος

Within the framework of Perseus and AegeanMarTech projects, multidisciplinary bio-optics experiments were conducted in the optically complex, permanently stratified waters of the NE Aegean Sea. We were able to obtain the particle size distribution (PSD) slope, using different optical sensors: (a) WET Labs ECO-B3B backscattering sensor measuring VSF at three wavelengths (470, 532, and 650 nm); (b) WET Labs C-Star transmissometer (660 nm) and Chelsea ALPHAtracka MKII (470 nm); and (c) Laser In Situ Scattering and Transmissometry – LISST-Deep. Values of the PSD slope estimated by all three methods were found to be within the ranges predicted by Mie theory and the literature. The optical backscattering ratio, bbp, was calculated from b_bp(660) and c_p(660) and subsequently the bulk index of refraction (np) was estimated as a function of the backscattering ratio and the PSD slope. In July 2014, the values of n_p varied between ~1.01 and >1.24 (mean 1.12±0.08), which fall between phytoplankton- and mineral-dominated waters. According to the spatial distribution of n_p two water layers could be identified, associated with different particle composition: (a) Black Sea water (BSW) and Levantine waters (LW) (from the surface to ~65 m depth) that appear to be dominated by material with mean index of refraction 1.13; and (b) the near-bottom layer which exhibited high n_p, >1.24, the latter attributed to mineral particles with high bulk index of refraction resuspended from the sea floor.

10.1117/12.2277426

Cite

Citations (0)

Use of Enrichment Factors for the Assessment of Heavy Metal Contamination in the Sediments of Koumoundourou Lake, Greece

Water Air & Soil Pollution (2009)

Aristomenis P. Karageorgis Stelios Katsanevakis Helen Kaberi

Sediment core

Loss on ignition

10.1007/s11270-009-0041-9

Cite

Citations (69)

HIGH-RESOLUTION GEOMORPHOLOGICAL MAPPING OF THE SHALLOW CONTINENTAL SHELF WEST OF THE KAVALA BAY, NORTH AEGEAN

Bulletin of the Geological Society of Greece (2017)

Ioannis P. Panagiotopoulos Vasilios Kapsimalis Chr. Ioakim Aristomenis P. Karageorgis G. Rousakis

Prominent geomorphological features of the shallow continental shelf west of the Kavala Bay (Loutra Eleftheron-Nea Peramos) were mapped using the data from a hydrographic survey (June 2014) of 320 nautical miles during which high resolution multibeam bathymetry and seismic-reflection subbottom profiling were carried out simultaneously. A fault zone comprised by a set of two primary sigmoidal gravity faults (recorded lengths and measured offsets: 12 km, 5 km and > 40 m, 25 m, respectively), with distinct expression on the seabed, and three other secondary gravity faults situated southern of the major faults, revealing synsedimentary tectonics, was identified. The striking difference between the texture of the footwall block sediments of the northern major fault and the texture of the sediments occupying the deep hanging wall block of the southern major fault emphasizes the impact of local tectonics on the sedimentary evolution of the study area. Concerning the observed bedforms, the most interesting were the sand dunes occurring at depths from 25 m to 65 m at least and occupying the northeast part of the study area. Their large dimensions and orientation in relation to the coastline position imply as a mechanism for their formation intense bottom-current activity.

Seabed

10.12681/bgsg.11746

Cite

Citations (2)

Cupriavidus metallidurans biomineralization ability and its application as a bioconsolidation enhancer for ornamental marble stone

Applied Microbiology and Biotechnology (2014)

Markos I. Daskalakis A. Magoulas Georgios Kotoulas Ioannis Katsikis Asterios Bakolas

Vaterite

Sonication

10.1007/s00253-014-5753-0

Cite

Citations (11)

A MSFD complementary approach for the assessment of pressures, knowledge and data gaps in Southern European Seas: The PERSEUS experience

Marine Pollution Bulletin (2015)

A. Crise Helen Kaberi Javier Ruiz А. Г. Зацепин Е. Г. Арашкевич

PERSEUS project aims to identify the most relevant pressures exerted on the ecosystems of the Southern European Seas (SES), highlighting knowledge and data gaps that endanger the achievement of SES Good Environmental Status (GES) as mandated by the Marine Strategy Framework Directive (MSFD). A complementary approach has been adopted, by a meta-analysis of existing literature on pressure/impact/knowledge gaps summarized in tables related to the MSFD descriptors, discriminating open waters from coastal areas. A comparative assessment of the Initial Assessments (IAs) for five SES countries has been also independently performed. The comparison between meta-analysis results and IAs shows similarities for coastal areas only. Major knowledge gaps have been detected for the biodiversity, marine food web, marine litter and underwater noise descriptors. The meta-analysis also allowed the identification of additional research themes targeting research topics that are requested to the achievement of GES.

Marine ecosystem

10.1016/j.marpolbul.2015.03.024

Cite

Citations (48)

Response of the Aegean Sea surface characteristics to turbidity variations, using numerical simulations.

Vassiliki Metheniti Vassilios Vervatis Aristomenis P. Karageorgis Nikolaos Kampanis Sarantis Sofianos

<p>The thermohaline and dynamic characteristics of the upper ocean can be affected by the way the sunlight is absorbed and scattered on the surface layer. Changes in light penetration can be investigated through the turbidity of the layer, which is determined by a synthesis of terrestrial inputs (atmospheric and riverine), and the biological activity in a region, of both natural and anthropogenic origin. To examine the effects that turbidity variability has on the surface-layer characteristics of the ocean, a twin modeling sensitivity experiment was performed, using as a case study the Aegean Sea, NE Mediterranean. The Aegean Sea is an oligotrophic region with most nutrient inputs located in the northern coasts of the basin, creating a north-to-south chlorophyll-a gradient, with the highest concentrations on the North and lowest on the South. The first experiment corresponds to a very clear ocean, and the second incorporates the turbidity field, varying according to chlorophyll-a concentration.<br>The experiments were implemented using the NEMO models' ocean component (v3.6) for the region (34.05-41.16 &#176;N, 22.29-28.98 &#176;E) and for the period 1997-2001, discretized on a 1/36&#176; Arakawa-C grid, with 75 partial step vertical levels. Atmospheric inputs are ERA-5 reanalysis products of the ECMWF service, whereas inputs for initial and boundary values have been derived from the Copernicus database. First, a two-band light penetration scheme was applied, using a Jerlov Type-I extinction depth at 23.0 m, representing the constant-low turbidity field. An RGB scheme was applied for the second experiment, using the multiyear monthly mean of the chlorophyll-a concentration variable derived from the ESA-CCI service. The sea surface variables' response is examined for the final year of the experiment. The results indicate that the RGB-scheme experiment estimates elevated sea surface salinity and temperature values, with the most significant difference in salinity located in the northern part of the basin, where there is a strong influence of the inflow of Black Sea Water from the Dardanelles Straits. Elevated eddy kinetic energy is observed in the gyres formed in the Cretan Sea.</p>

Turbidity

Surface layer

Ocean color

Mixed layer

10.5194/egusphere-egu22-3773

Cite

Citations (0)

Using multi-actor labs as a tool to drive sustainability transitions in coastal-rural territories: Application in three European regions

GAIA - Ecological Perspectives for Science and Society (2024)

Alice Guittard Erasmia Kastanidi Ebun Akinsete Håkan Berg Caitríona Carter

Evidence on the efficacy of impacts from real-world experiments in triggering transformative processes is still scarce. This study evaluates multi-actor labs to provide examples of direct impacts of real-world experiments in tackling long-standing, local, sustainability challenges.Multi-actor labs (MALs), a form of real-world social experiments, were implemented in three coastal-rural regions in France (Charente River Basin), Spain (Mar Menor), and Greece (South-West Messinia) to better assess and tackle coastal-rural interactions that govern local sustainability challenges, such as water use conflicts and biodiversity degradation. The MALs used participative methodologies based on systems thinking and transition management. Stakeholders were continuously engaged in a series of workshops to co-produce knowledge, reach a common understanding of the sustainability challenges and issues at stake, and co-design solutions in the form of a roadmap for sustainable transitions in coastal-rural regions. This paper evaluates MALs to provide examples of successful sustainability transition experiments based on the outputs produced, outcomes achieved, and processes used in the three coastal, rural regions.

Transformative Learning

Transition Management

10.14512/gaia.33.s1.9

Cite

Citations (5)