Sylvia Christodoulaki

Hellenic Centre for Marine Research

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George Petihakis

Hellenic Centre for Marine Research

Kostas Tsiaras

Hellenic Centre for Marine Research

G. Triantafyllou

Hellenic Centre for Marine Research

Maria Kanakidou

University of Crete

Constantin Frangoulis

Hellenic Centre for Marine Research

N. Mihalopoulos

University of Crete

Manos Pettas

Hellenic Centre for Marine Research

Evi Bourma

Hellenic Centre for Marine Research

Maria Sotiropoulou

Hellenic Centre for Marine Research

Paris Pagonis

Hellenic Centre for Marine Research

Cooperative Institutions

Hellenic Centre for Marine Research

National and Kapodistrian University of Athens

University of Crete

University of the Aegean

National Technical University of Athens

Aristotle University of Thessaloniki

Institute of Oceanography

Crete University Press

National Observatory of Athens

Foundation for Research and Technology Hellas

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The POSEIDON Ocean Observing System: Technological Development and Challenges

Journal of Marine Science and Engineering (2022)

Manolis Ntoumas Leonidas Perivoliotis George Petihakis Γεράσιμος Κορρές Constantin Frangoulis

Advanced marine observation infrastructures are the most significant scientific tool for the study of marine ecosystem trends and shifts. Ocean monitoring technologies, though highly demanding and expensive, are essential for the monitoring and long-term study of oceanic systems. The POSEIDON system for monitoring and forecasting the marine environment is an augmented research infrastructure, unique in the Eastern Mediterranean basin, contributing to the European Ocean Observing System implementation, focusing—among others—on biogeochemical observations and deep-sea ecosystem and geological processes. The technological evolution of the POSEIDON system through a science-coupled strategy supported by engineers and scientists, resulted in a state-of-the-art ocean observing system. There has been a continuous expansion of the infrastructure with new scientific platforms and supporting facilities. Innovative sensing technologies were introduced in the operational data acquisition and new methodologies and tools were developed to improve the system operations and efficiency. As a part of the scientific community of ocean observatories, POSEIDON contributes actively to the improving of the ocean observing. International access to engineering and field demonstrating services, data products and technology testing facilities has been offered to scientists and industry partners. POSEIDON is a widely recognizable international technology testing/demonstrating node specializing in marine technology providing high-level services.

Ocean observations

Marine technology

10.3390/jmse10121932

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Citations (3)

The POSEIDON Supersite Observatory. A Technological Test-bed for the Eastern Mediterranean

OCEANS 2019 - Marseille (2019)

Constantin Frangoulis Margarita Bekiari Alkiviadis Kalampokis Michalis Ravdas Evi Bourma

The POSEIDON system is a comprehensive marine monitoring and forecasting system that progressively fills the gaps of observing facilities in the eastern part of the Mediterranean Sea. This system is expanding its various open and coastal sea infrastructure that includes fixed platforms, a cabled deep-ocean observatory, a FerryBox system, high-frequency (HF) radars, gliders, a calibration lab and Argos floats. Besides offering information to science and society, the POSEIDON system via its various platforms is also being used as a technology test-bed for numerous applications. The fields of technological test span from industrial application as material aging, advanced positioning systems, fuel cells technology, new sensor testing, to multiple scientific uses as carbonate system and fluorescence sensors, microplastics and pollutants sampling. These applications are summarized and selected examples are presented. The demand for access to POSEIDON infrastructures for technological tests has increased over the last years thanks to the transnational access activities coordinated by EU projects and is expected to further increase via a national research marine observing infrastructure initiated in 2018. The addition of new infrastructures planned for the near future will further enhance the technological test-bed possibilities and thus the interaction with other research institutions and the industry.

10.1109/oceanse.2019.8867105

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Human - driven atmospheric deposition of N & P controls on the East Mediterranean marine ecosystem

EGUGA (2016)

Sylvia Christodoulaki George Petihakis N. Mihalopoulos Kostas Tsiaras G. Triantafyllou

Deposition

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Fingerprint of the atmospheric deposition on the biogeochemical functioning in the Mediterranean Sea - Evolution since the preindustrial era and projections

EGU General Assembly Conference Abstracts (2017)

Sylvia Christodoulaki George Petihakis N. Mihalopoulos Kostas Tsiaras G. Triantafyllou

Biogeochemical Cycle

Deposition

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Human-Driven Atmospheric Deposition of N and P Controls on the East Mediterranean Marine Ecosystem

Journal of the Atmospheric Sciences (2016)

Sylvia Christodoulaki George Petihakis N. Mihalopoulos Kostas Tsiaras G. Triantafyllou

Abstract The historical and future impacts of atmospheric deposition of inorganic nitrogen (N) and phosphorus (P) on the marine ecosystem in the east Mediterranean Sea are investigated by using a 1D coupled physical– biogeochemical model, set up for the Cretan Sea as a representative area of the basin. For the present-day simulation (2010), the model is forced by observations of atmospheric deposition fluxes at Crete, while for the hindcast (1860) and forecast (2030) simulations, the changes in atmospheric deposition calculated by global chemistry–transport models are applied to the present-day observed fluxes. The impact of the atmospheric deposition on the fluxes of carbon in the food chain is calculated together with the contribution of human activities to these impacts. The results show that total phytoplanktonic biomass increased by 16% over the past 1.5 centuries. Small fractional changes in carbon fluxes and planktonic biomasses are predicted for the near future. Simulations show that atmospheric deposition of N and P may be the main mechanism responsible for the anomalous N:P ratio observed in the Mediterranean Sea.

Biogeochemical Cycle

Deposition

Marine ecosystem

Hindcast

Mediterranean Basin

10.1175/jas-d-15-0241.1

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Citations (12)

Simulations of the impact of high pulse atmospheric deposition events on a low nutrient low chlorophyll (LNLC) marine ecosystem

EGU General Assembly Conference Abstracts (2014)

Sylvia Christodoulaki George Petihakis Kostas Tsiaras G. Triantafyllou N. Mihalopoulos

Deposition

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Atmospheric nitrogen deposition over the Mediterranean, Black Sea and Europe as simulated by the WRF-CMAQ model system

EGU General Assembly Conference Abstracts (2013)

Ulaş İm Kalliopi Violaki P. Zarmpas Sylvia Christodoulaki Mustafa Koçak

CMAQ

Deposition

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Atmospheric deposition in the Eastern Mediterranean. A driving force for ecosystem dynamics

Journal of Marine Systems (2012)

Sylvia Christodoulaki George Petihakis Maria Kanakidou N. Mihalopoulos Kostas Tsiaras

Biogeochemical Cycle

Deposition

Marine ecosystem

Nutrient cycle

New production

10.1016/j.jmarsys.2012.07.007

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Citations (47)

Saharan Dust Deposition Effects on the Microbial Food Web in the Eastern Mediterranean: A Study Based on a Mesocosm Experiment

Frontiers in Marine Science (2017)

Paraskevi Pitta Maria Kanakidou N. Mihalopoulos Sylvia Christodoulaki Panagiotis D. Dimitriou

The effect of episodicity of Saharan dust deposition on the pelagic microbial food web was studied in the oligotrophic Eastern Mediterranean by means of a mesocosm experiment in May 2014. Two different treatments in triplicates (addition of natural Saharan dust in a single-strong pulse or in three smaller consecutive doses of the same total quantity), and three unamended controls were employed; chemical and biological parameters were measured during a 10-day experiment. Temporal changes in primary (PP) and bacterial (BP) production, chlorophyll a (Chla) concentration and heterotrophic bacteria, Synechococcus and mesozooplankton abundance were studied. The results suggested that the auto- and hetero-trophic components of the food web (at least the prokaryotes) were enhanced by the dust addition (and by the nitrogen and phosphorus added through dust). Furthermore, a 1-day delay was observed for PP, BP and Chla increases when dust was added in three daily doses; however, the maximal values attained were similar in the two treatments. Although the effect was evident in the first osmotrophic level (phytoplankton and bacteria), it was lost further up the food web, masked under the impact of grazing exerted by predators such as heterotrophic flagellates, ciliates and dinoflagellates. This was partly proved by two dilution experiments. This study demonstrates the important role of atmospheric deposition and protist grazing when evaluating the effect on oligotrophic systems characterised by increased numbers of trophic levels.

Mesocosm

Microbial food web

Deposition

10.3389/fmars.2017.00117

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Citations (38)

Atmospheric Deposition Controls On The East Mediterranean Marine Ecosystem

93rd American Meteorological Society Annual Meeting (2013)

Sylvia Christodoulaki

Deposition

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