Riyad Manasrah

Riyad Manasrah
University of Jordan | UJ · Department of Physics

PhD / Physical Oceanography

About

47
Publications
19,513
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808
Citations
Introduction
Riyad Manasrah currently works at the Department of Coastal Environment, University of Jordan. Riyad does research in Oceanography and Paleoclimatology. Their most recent publication is 'Impact of artificial lagoons on seawater quality: evidence from 7 years of physicochemical seawater monitoring'.
Additional affiliations
December 2002 - December 2017
University of Jordan
Position
  • Professor (Full)
September 2014 - April 2015
University of Jordan
Position
  • Head of Depertment of Coastal Environment

Publications

Publications (47)
Conference Paper
The present study aimed to evaluate the implementation of Lipid Peroxidation (LPO) and Lactate Dehydrogenase (LDH) as an early warning tool for monitoring coral health status and assessing the ecological situation of corals in relation to global and local environmental change in the Gulf of Aqaba. To reach our objectives, we have developed a novel...
Article
Full-text available
A total of 185,026 fish individuals representing 101 shallow-water species belonging to 38 families were counted in the present survey. The most abundant species during this surveys was Atherinomorus lacunosus-robust silverside with (RA=42.7%), followed by Diplodus noct-Red Sea bream (RA=13.5%), Neopomacentrus miryae- Miry's demoiselle (RA=10.2%),...
Article
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This research investigated physical (temperature, salinity, and density) and chemical (dissolved oxygen, ammonium, nitrate, nitrite, phosphate, and silicate) properties of offshore seawater in the Red Sea northern Gulf of Aqaba; Jordanian Site were measured during 2013–2015 to assess the temporal and seasonal variation of the upper 400 m of the wat...
Article
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This study aims to present the practices of coastal zone management of the Jordanian coastline in the Gulf of Aqaba by mapping and analyzing the business sectors along the Jordanian coastline and their corresponding potential impact on marine environment. Geographic Information System (GIS) tools were applied in order to illustrate the spatial conv...
Article
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This research focused on studying the physical properties (temperature, salinity and density) and water exchange system in Saraya Lagoon during spring in northernmost Gulf of Aqaba in order to evaluate the environmental condition in term of hydrological and dynamical features compared to open sea. The results showed that temperature, salinity and d...
Article
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This research investigated the levels of 16 trace and heavy elements in seawater for the first time in the northern Gulf of Aqaba. The concentrations of four selected sites along the Jordanian coast. The elements were determined by using Inductively Coupled Plasma Mass Spectroscopy (ICP-MS). Observed concentrations of Co, Cu, Ni, and Zn in seawater...
Article
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In order to study temperature dispersion of cooling water discharged into seawater, temperature values were recorded monthly for different transects during the study period (April-August 2015) in front of Aqaba Thermal Power Station (ATPS). A simple conservative model was developed to estimate the dispersion of temperature after discharge from the...
Article
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This research was aimed at studying the general environmental status of the marina at Royal Yacht Club (RYC), which is located in the Jordanian Gulf of Aqaba. The physical properties (temperature, salinity and density) were measured at surface and bottom water at 19 sites (T1 - T19). Total hydrocarbon was measured at surface at 12 sites (HC1-HC12)....
Article
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Radiochemical analysis was carried out on drinking water sources in the south region of Jordan. There is no information reported so far about radioactivity concentrations in drinking water. Therefore, gross alpha and beta activity concentrations were determined for tap water (TW), home filtered tap water, commercial water, and bottled water to eval...
Chapter
The Gulf of Aqaba is located in the sub-tropical arid zone between 28o–29o30′N and 34o30′–35oE. It is a semi-enclosed basin that extends over a length of 180 km with a width between 5 and 25 km (average of 16 km). The deepest point in the Gulf reaches 1825 m with an average depth of 800 m. The Gulf is connected to the Red Sea by the Strait of Tiran...
Article
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The aim of this study was to investigate the community structure of deep sea fishes in the northern Gulf of Aqaba. Deep fish traps, short lines and long lines were deployed at depth ranges from 60 to 700 m between June 2014 and May 2015. A total of 369 fish individuals belonging to 37 species in 21 families were collected. The most abundant family...
Article
Full-text available
In this research, the primary focus was to analyze and determine the primary elements in drinking water. Fourteen selected elements, namely Al, Ca, Cr, Cu, Fe, K, Mg, Na, Ni, P, S, Si, Ti and Zn, were identified in drinking water from three different sources (tap water (TW), filtered tap water (FTW) and bottled water (BW) in Aqaba city (Jordan). Th...
Article
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Seven years (2010–2016) of data on the basic physicochemical properties of seawater, temperature, salinity, dissolved oxygen (DO), nutrients, chlorophyll a (Chl a), and hydrocarbons from two lagoons were used to evaluate the impact of the anthropogenic activities inside the lagoon on the water quality and to explore the relationship of any impact f...
Article
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International cooperation is a must to achieve the goal of sustainable development, since only through cross border actions' complex issues like environmental degradation can be faced. Supranational initiatives and shared objectives are the only path for getting a durable and effective green strategy, which transcends boundaries or governments and...
Article
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Community structure of coral reef fishes in relation to habitat and depth in the northern Gulf of Aqaba/Jordan were studied by visual census method. Changes of the fish community structures between summer and winter were determined. A total of 27882 fish individuals representing 65 species and 16 families were recorded. Fifty five and fifty eight s...
Article
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Uranium has three isotopes in nature, the 238U, 235U and 234U. The presence of uranium isotopes in marine sediment at relatively high concentrations was the drive behind several studies to determine the radionuclides levels in marine ecosystems to assess the potentially negative effects on environment. This study determined the activity concentrati...
Article
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This study investigated the activity concentrations of natural and artificial radionuclides in marine sediment and seagrass form the northern Gulf of Aq-aba, aiming at evaluating the radiation levels and their environmental risks. Samples of sediment and seagrass were selected at four representative locations according to human activities in each s...
Poster
Full-text available
Impatto ambientale dovuto ad uranio presente in sedimenti marini prossimi ad un porto minerario di fosfati nella porzione nord del golfo di Aqaba, Giordania
Technical Report
This report is based on the data collected by the participant scientists, in addition to the published and unpublished data, the results and analysis of the surveys, and research and monitoring programmes and various activities carried out by the staff of the Faculty of Marine Sciences, researchers of the Marine Science Station, and researchers fro...
Article
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The salt conservation law was applied, for the first time, in order to compare the real and calculated values of water outflow (m 3 /s) and residence time (days) in the lagoons of Ayla Oasis at the northernmost tip of the Gulf of Aqaba. The aim is to obtain the scientific bases of monitoring beside the real observation in areas that could not be me...
Article
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Spatial and temporal variation of temperature, salinity, sigma-t, dissolved oxygen (DO) and residence time in the artificial Ayla lagoons in the northern Gulf of Aqaba were studied during the period June 2012-May 2013 to achieve, for the first time, a detailed description of water properties. That’s for obtaining scientific bases for management and...
Article
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Variations of tide and mean sea level (MSL) were studied during the period August 2000-March 2004 in the northern Gulf of Aqaba to detect the seasonal differences of tide records and tide components signals. The study revealed seasonal cycle of the MSL in the northern Gulf, which was lower during summer than in winter due to the relative strong win...
Article
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The continuous release of organic C-rich material by reef-building corals can contribute substantially to biogeo-chemical processes and concomitant rapid nutrient recycling in coral reef ecosystems. However, our current un-derstanding of these processes is limited to platform reefs exhibiting a high degree of ecosystem closure compared to the globa...
Article
Recent studies have demonstrated that organic matter released by hermatypic corals can play an important role as carrier of energy, thereby initiating element cycles in coral reef systems. However, although another commonly occurring cnidarian, the scyphozoan upside-down jellyfish Cassiopea sp., can reach high abundances in such reef systems, its p...
Article
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The present study investigated the variability of monthly mean sea level data and discussed its relation with climatic events in the Red Sea during 1958-2001. The data were obtained from Simple Ocean Data Assimilation (SODA), for three different locations (north, central and south) in the Red Sea. Spatial and temporal variability as well as trends...
Article
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Variations of heavy metals concentrations (Pb, Zn, Ni and Cd) in suspended matter as well as the physical properties (temperature, salinity, dissolved oxygen and pH) at five coastal sites and one reference station (offshore) were measured on seasonal base of the year 2005. Seasonal variations of seawater temperature, salinity, pH and dissolved oxyg...
Article
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Temporal and spatial variations of seawater temperature and salinity were investigated at three stations in northern Gulf of Aqaba for six years "May 1997-April 2003". The results showed that, thermal stratification characterized the upper water column during summer (May-December). The strongest stratification appeared in August exceeding 250 m. Mi...
Article
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Environmental qualities of coastal water and bottom sediment were assessed at Jordan's northernmost tip of Gulf of Aqaba to evaluate possible impacts of the bordering fish pen cages in Eilat. Results showed significant differences between surface and bottom water in the chemical and physical variables in the different months of the year (2004-2005)...
Article
The abundance and composition of the mesozooplankton were studied in the upper 100 m of the northern Gulf of Aqaba over a period of 22 months between February 2002 and December 2003. The samples were collected monthly with a Nansen net of 200 μm mesh size. The abundance of total mesozooplankton ranged between 245 and 3065 ind. m− 3. Highest densiti...
Article
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Seasonal changes of tide signal(s), temperature, salinity and current were studied during the years 2004-2005 in the northernmost Gulf of Aqaba, which is under developmental activities, to obtain scientific bases for best management and sustainability. Spectrum analysis revealed permanent signals of tide measurements during all seasons, which repre...
Article
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An 18-year (1988-2005) stable oxygen isotopic composition (δ18O) of two coral colonies (Porites lutea and P. lobata) from two different sites in the northern end of the Gulf of Aqaba (Red Sea) successfully records the seasonal variability in sea surface temperature (SST). The mean annual SST record from the study sites ranges between 21.18°C to 26....
Article
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The physicochemical properties of 21 marine sediment samples were investigated, collected from five different localities along the Jordanian coast of the Gulf of Aqaba. According to the chemical parameters, sediments were categorized into three groups: carbonate (80% CaCO3), composed mainly of materials of calcareous skeletal structures; terrigenou...
Article
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The Gulf of Aqaba exhibits a strong seasonality due to convective mixing during winter and stratification during summer. The present study provides a detailed appraisal of summer and winter sea-water characteristics at the northern coast of the Gulf of Aqaba, that is witnessing rapid development and increasing changes in its geomorphological charac...
Article
This study was focused on analysis of the horizontal and vertical current components with correspondence to tide variation, heat flux, seiches and relative backscatter intensity in coastal waters of the northern Gulf of Aqaba during the summers of 2001–2004. Spectrum analysis has shown eight distinguishable peaks of the tide measurements. In additi...
Article
Full-text available
Five years (1998, 2000-2003) of summer records of temperature,nutrients and dissolved oxygen concentrations in the upper 400 mof the water column of the northern Gulf of Aqaba were employedto produce a simple statistical model of the relationship betweentemperature versus nitrate, phosphate, silicate and dissolvedoxygen concentrations. Temperature...
Article
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This study is devoted to oceanographic features of the semi-enclosed Gulf of Aqaba, Red Sea. The data were recorded in winter—spring 1999 on the R/V Meteor cruise leg 44/2. Temperature and salinity profiles were measured at six positions (I—VI). The shipboard NarrowBand Acoustic Doppler Current Profiler (NB ADCP) 150 kHz continuously recorded curre...
Article
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The role of deep sediment in supporting nutrient budget in the Gulf of Aqaba has been investigated by estimating the flux of inorganic nitrogen, phosphate and silicate. Fluxes were calculated directly by pore water profiles and indirectly by chamber incubations carried out onboard the RV Meteor cruise. The results showed that maximum potential flux...
Article
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The spatial distribution and community structure of the family Labridae were studied at different depths and sites along the Jordanian coast of the Gulf of Aqaba in the seagrass and coral reef habitats. A total of 44 species of labrid fish were observed during the 187 visual census performed in seventeen sites. Out of the 44 labrid fish species enc...
Article
Five years (1998, 2000-2003) of summer records of temperature, nutrients and dissolved oxygen concentrations in the upper 400 m of the water column of the northern Gulf of Aqaba were employed to produce a simple statistical model of the relationship between temperature versus nitrate, phosphate, silicate and dissolved oxygen concentrations. Tempera...
Article
Full-text available
In order to characterize the process of calcification in scleractinian corals, a series of laboratory experiments were conducted using radioactive isotopes. Labelled calcium, bicarbonate and glucose were used and the fates of the labelled tracers were followed in the skeleton and the tissue fractions of the coral Galaxea fascicularis. In addition,...
Article
Full-text available
The thermohaline characteristics of the Gulf of Aqaba, Red Sea,depict a well-defined seasonal pattern of winter mixing from December toApril and summer stratification from May to November. This thermohalinestructure is a major controlling factor of the nutrient, chlorophyll a and primary productivity seasonal cycles. The nitrate and chlorophyll a c...
Article
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Water mass characteristics and circulation patterns in the Gulf of Aqaba and northern Red Sea were studied for the first time during the r/v "Meteor" cruise leg 44/2 from February 21st to March 7th 1999 using temperature-salinity profiles and current observations. The deep water in the northern Red Sea had similar characteristics to the well-mixed...
Thesis
Full-text available
Meteor cruise 44/2 scanned the Gulf of Aqaba and northern Red Sea during spring 1999. 72 salinity and temperature profiles were measured at 12 stations; 6 in the northern Red Sea,-->and other 6 stations in the Gulf of Aqaba. The shipboard NB ADCP 150 kHz recorded continuously current profiles down to 350 m en route. Time series of sea level and met...

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