Abed El Rahman Hassoun

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• PhD in Oceanology
• Researcher at GEOMAR Helmholtz Centre for Ocean Research Kiel

The European Ocean Observing Community (EOOC) integrates inputs from diverse entities dedicated to comprehensively monitoring and forecasting oceanic phenomena in European Seas. With increasing climate and anthropogenic pressures, the urgency of ensuring the EOOC’s preparedness to observe Essential Ocean Variables (EOVs) is evident. This paper advo...

Mediterranean open marine and coastal ecosystems face multiple risks, due to climate change, that impact their unique biodiversity. To assess these risks and evaluate their confidence levels, we adopt the scenario-based approach of the Intergovernmental Panel on Climate Change (IPCC), relying on a review of literature projecting changes in Mediterr...

The EU funded project EuroSea brought together key actors of the European ocean observing and forecasting communities with key users of the ocean observing products and services in order to better integrate existing ocean observation systems and tools, and to improve the delivery of ocean information to users. EuroSea was constructed around the oce...

The interdisciplinary community of ocean and coastal observers and modelers in Europe is driven by national observing needs for prediction and management of intricate processes shaping Europe’s Seas. Not all observing needs can be addressed by nations alone and various coordination activities exist to overcome fragmentation and create cross benefit...

We carried out measurements of the CO2 system parameters to evaluate the impact of carbonate and nutrients’ chemistry on phytoplankton populations in the Gulf of Guinea (GoG). The seasonal variations of the CO2 system parameters (fCO2, DIC, pH and TA) along with nitrates and phosphates were quantified weekly at surface (between 0 and 5 m depth) (5....

Pollution of the aquatic environment is a real threat across the globe. It is becoming a topic of intense study for researchers. It has been updated and almost completely revised. The Mediterranean Sea has been recognized as a target hotspot of the world as the pollutant concentration in this region is greater than the levels in other oceans. The b...

This chapter gives an overview of the general biogeochemistry in the Mediterranean Sea explaining the particularities of the main biogeochemical variables and the physical, biological, and geochemical processes driving their distribution in the main basins of this marginal sea. Each subsection focuses on one essential variable, starting from dissol...

Few studies on microplastics (MPs) in the marine environment have been conducted along the Eastern part of the Mediterranean Sea and even fewer along the Lebanese coast. This study aims to determine MPs contamination for the first-time in coastal and continental shelf sediments collected along the Lebanese shores, South-Eastern Mediterranean Sea. S...

Seven ciliate tintinnids are reported in this study for the first time in Lebanese marine waters: Leprotintinnus nordqvisti (Brandt 1906) Kofoid and Campbell, 1929, Codonellopsis ostenfeldi Schmidt, 1902, Dictyocysta fundlandica Ehrenberg, 1854, Undellopsis subangulata (Jörgensen) Kofoid and Campbell, 1929, Canthariella pyramidata (Jörgensen 1924)...

Ocean acidification (OA) is a serious consequence of climate change with complex organism-to-ecosystem effects that have been observed through field observations but are mainly derived from experimental studies. Although OA trends and the resulting biological impacts are likely exacerbated in the semi-enclosed and highly populated Mediterranean Sea...

The spectrophotometric methodology for carbonate ion determination in seawater was first published in 2008 and has been continuously evolving in terms of reagents and formulations. Although being fast, relatively simple, affordable, and potentially easy to implement in different platforms and facilities for discrete and autonomous observations, its...

Pufferfishes are among the best-known marine organisms that accumulate marine biotoxins such as Tetrodotoxin (TTX). In the Mediterranean Sea, the silver-cheeked toadfish Lagocephalus sceleratus is the most reported TTX-bearer, causing many fatal and non-fatal cases. In Lebanon, no previous studies have measured TTX levels although the possibility o...

Time-series stations in the Mediterranean Sea are still scarce and not equally distributed within its sub-basins, a significant obstacle in characterizing physical, chemical, and biological trends with good temporal and geographic coverage in a sea undergoing multiple changes due to climate change. We discuss two time-series stations located offsho...

Despite emerging and increasing concerns related to marine micro and macroplastics, no systematic surveys have been undertaken yet in the Lebanese marine area. To understand the spatio-temporal variation of plastic litter (macro and microplastics) in the Lebanese marine environment and to determine the sources of pollution, this study investigated...

Marine biotoxins are naturally existing chemicals produced by toxic algae and can accumulate in marine biota. When consumed with seafood, these phycotoxins can cause human intoxication with symptoms varying from barely-noticed illness to death depending on the type of toxin and its concentration. Recently, the occurrence of marine biotoxins has bee...

The different components of the Mediterranean Basin (land, coast, and sea) are undergoing significant changes due to multiple anthropogenic pressures, including climate change, pollution and other factors. The 1st Mediterranean Assessment Report (MAR1), produced by the Mediterranean Experts on Climate and environmental Change (MedECC) and based on...

Despite covering only 0.82% of the ocean’s surface, the Mediterranean Sea supports up to 18% of all known marine species, with 21% being listed as vulnerable and 11% as endangered. The acceler- ated spread of tropical non-indigenous species is leading to the “tropicalization” of Mediterranean fauna and flora as a result of warming and extreme heat...

Mediterranean Ecosystem report on Climate and Global changes. Balzan MV, Hassoun AER, Aroua N, Baldy V, Bou Dagher M, Branquinho C, Dutay J-C, El Bour M, Médail F, Mojtahid M, Morán-Ordóñez A, Roggero PP, Rossi Heras S, Schatz B, Vogiatzakis IN, Zaimes GN, Ziveri P 2020 Ecosystems. In: Climate and Environmental Change in the Mediterranean Basin –...

Marine ecosystems: Despite covering only 0.82% of the ocean’s surface, the Mediterranean Sea supports up to 18% of all known marine species, with 21% being listed as vulnerable and 11% as endangered. The accelerated spread of tropical non-indigenous species is leading to the “tropicalization” of Mediterranean fauna and flora as a result of warming...

The last few decades have seen dramatic changes in the hydrography and biogeochemistry of the Mediterranean Sea. The complex bathymetry and highly variable spatial and temporal scales of atmospheric forcing, convective and ventilation processes contribute to generate complex and unsteady circulation patterns and significant variability in biogeoche...

Balzan MV, Hassoun AER, Aroua N, Baldy V, Bou Dagher M, Branquinho C, Dutay J-C, El Bour M, Médail F, Mojtahid M, Morán-Ordóñez A, Roggero PP, Rossi Heras S, Schatz B, Vogiatzakis IN, Zaimes GN, Ziveri P 2020 Ecosystems. In: Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean...

The last decades have seen dramatic changes in the hydrography and biogeochemistry of the Mediterranean Sea. The complex bathymetry, highly variable spatial and temporal scales of atmospheric forcing and internal processes contribute to generate complex and unsteady circulation patterns and significant variability in biogeochemical systems. Part of...

The coastal carbonate system regulates the pH of the coastal waters and controls the circulation of CO2 between land-sea interfaces and open sea system. In the context of the ELME (Evaluation of the Lebanese Marine Environment: A multidisciplinary study) project, a seasonal survey of the carbonate system has been started in 2019 through the samplin...

Let's talk about research justice! My contribution to the NANO newsletter (May 2020): https://nf-pogo-alumni.org/wp-content/uploads/2020/06/NN18_02Jun.pdf **I have always loved the sea and its creatures, and appreciated the land and its humans! This is why social networking means a lot to me and has helped me so much to evolve professionally as w...

Ocean Acidification action plan priorities for the Western Indian Ocean region. Laffoley, D., Baxter, J.M., Hassoun, A.E.R., Spalding, M., Osborn, D., Oliver, J., & Andrew, T.G. 2020. Towards a western Indian Ocean regional ocean acidification action plan. Workshop report. Switzerland, IUCN. 29pp.

Free access till the 7th of September 2019 via this link: https://authors.elsevier.com/a/1ZP~v3Ruf15fXg The carbonate system is a vital buffering system that controls the pH of seawater and maintains a healthy environment for marine organisms. As concerns regarding the fate of anthropogenic CO2 in the oceans are rising, it is becoming increasingly...

The carbonate system is a vital buffering system that controls the pH of seawater and maintains a healthy environment for marine organisms. As concerns regarding the fate of anthropogenic CO 2 in the oceans are rising, it is becoming increasingly urgent to systematically quantify and understand this system's parameters, particularly in heavily huma...

Highlights: *This work aims to quantify the carbonate system in the Lebanese waters, Easternmost part of the Levantine Sub-basin, and to assess its tendency between 2012 and 2017. *High quality measurements of total alkalinity (AT), total dissolved inorganic carbon (CT), with other environmental parameters, are being sampled monthly since 2012 betw...

Organic pollution is a major global environmental issue for coastal ecosystems. In order to assess the effects of this pollution, environmental parameters and phytoplankton community were monitored during a two-year period (from April 2010 till March 2012) in the central coast of Lebanon in the Levantine Sub-basin. Data were collected for temperatu...

e present study investigates aspects of the biology of round sardinella, Sardinella aurita (Valenciennes, 1847) collected from Dora and Tripoli (Lebanon) between September 2012 and September 2013. A total of 1422 specimens were collected from catches of purse seines and gillnets. Data on fish total length (LT), total weight (WT), sex and maturity w...

Anthropogenic CO2 is a major driver of the present ocean acidification. This latter is threatening the marine ecosystems and has been identified as a major environmental and economic menace. This study aims to forecast from the thermodynamic equations, the acidification variation (ΔpH) of the Mediterranean waters over the next few decades and beyon...

The carbonate system is very important since it regulates the pH of the seawater and controls the circulation of CO 2 between the various natural reservoirs. Recently, several oceanographic cruises have been carried out to assess this system in the Mediterranean Sea. However, the measurements undertaken to quantify the carbonate system parameters i...

Using the biogeochemical data of the May 2013 MedSeA cruise, we were able to estimate the anthropogenic CO2 (CANT) concentrations and the acidification level (ΔpH=pH2013–pHpre-industrial) in the Mediterranean Sea. Applying the TrOCA approach, our results show that the most invaded waters (>60 µmol kg−1) are those of the intermediate and deep layers...

A compilation of data from several cruises between 1998 and 2013 was used to derive polynomial fits that estimate total alkalinity (AT) and total dissolved inorganic carbon (CT) from measurements of salinity and temperature in the Mediterranean Sea surface waters. The optimal equations were chosen based on the 10-fold cross-validation results and r...

A compilation of several cruises data from 1998 to 2013 was used to derive polynomial fits that estimate total alkalinity (AT) and total inorganic carbon (CT) from measurements of salinity and temperature in the Mediterranean Sea surface waters. The optimal equations were chosen based on the 10-fold cross validation results and revealed that a seco...

This study presents an estimation of the anthropogenic CO2 (CANT) concentrations and acidification (ΔpH=pH2013 - pHpre-industrial) in the Mediterranean Sea, based upon hydrographic and carbonate chemistry data collected during the May 2013 MedSeA cruise. The concentrations of CANT were calculated using the composite tracer TrOCA. The CANT distribut...

Most global ocean models are based on the assumption of a " steady state " ocean. Here, we investigate the validation of this hypothesis for the anthropized Mediterranean Sea. In order to do so, we calculated the mixing coefficients of the water masses detected in this sea via an optimum multiparameter analysis referred to as the MIX approach, usin...

Measurements of the CO 2 system parameters in the Mediterranean Sea are relatively scarce and not representative for all its sub-basins. High quality data collected on May 2013 during the 2013 MedSeA cruise covering the whole basin were used to provide for the first time linear relationships estimating the total alkalinity (A T) and the total disso...

Most global ocean models are based on the assumption of a "steady state" ocean. Here, we investigate the validation of this hypothesis for the anthropized Mediterranean Sea. In order to do so, we calculated the mixing coefficients of the water masses detected in this sea via an optimum multiparameter analysis referred to as the MIX approach, using...

The Mediterranean Sea, considered as a “laboratory” basin, is facing large oceanographic and biogeochemical changes driven by both natural and anthropogenic pressures. Measurements of the carbonate system parameters of this highly diverse region remain relatively scarce. Data collected on May 2013 during the MedSeA cruise are displayed and used to...

The objective of this thesis is to contribute in the estimation of the anthropogenic CO2 concentrations (CANT) and the acidification in the Mediterranean Sea, as well as to predict the future acidification variations. Firstly, it is necessary to study the distribution of the hydrological (Temperature, salinity, dissolved oxygen, apparent oxygen uti...

The global climate of the Lebanese coast is humid thermo–Mediterranean with a subtropical tendency to the South. The coastal waters are subject to the effect of the region's weather and climatic factors. Lebanon presents two main seasons: a hot dry summer and a cold rainy winter. The present work focuses on the inter-annual variations of monthly se...

The global climate of the Lebanese coast is humid thermo–Mediterranean with a subtropical tendency to the South. The coastal waters are subject to the effect of the region's weather and climatic factors. Lebanon presents two main seasons: a hot dry summer and a cold rainy winter. The present work focuses on the inter-annual variations of monthly se...

Ocean acidification had become a major concern for marine scientists, thus a major field in marine sciences. This poster presents the context, objectives, study area, methodology and the preliminary results of an ongoing study aiming to assess the distribution of the carbonate system properties in the Mediterranean Sea, to estimate the anthropogeni...

The effect of continental inputs on environmental conditions and chlorophyll-a have been studied monthly in surface water samples from 5 littoral stations in central Lebanese coastal waters for a period of 3 years between September 2009 and June 2012. Three stations show different levels of impact as a result of river inputs and sewage discharges....