scholarly journals Spatial Variability and Trends of Marine Heat Waves in the Eastern Mediterranean Sea over 39 Years

2021 ◽  
Vol 9 (6) ◽  
pp. 643
Author(s):  
Omneya Ibrahim ◽  
Bayoumy Mohamed ◽  
Hazem Nagy
Keyword(s):  
Spatial Variability ◽  
Mediterranean Sea ◽  
Heat Waves ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Sea Surface ◽  
Sea Level Pressure ◽  
Eastern Mediterranean Sea ◽  
Marine Life ◽  
The Mean

Marine heatwaves (MHWs) can cause devastating impacts on marine life. The frequency of MHWs, gauged with respect to historical temperatures, is expected to rise significantly as the climate continues to warm. The MHWs intensity and count are pronounced with many parts of the oceans and semi enclosed seas, such as Eastern Mediterranean Sea (EMED). This paper investigates the descriptive spatial variability and trends of MHW events and their main characteristics of the EMED from 1982 to 2020 using Sea Surface Temperature (SST) data obtained from the National Oceanic and Atmospheric Administration Optimum Interpolation ([NOAA] OI SST V2.1). Over the last two decades, we find that the mean MHW frequency and duration increased by 40% and 15%, respectively. In the last decade, the shortest significant MHW mean duration is 10 days, found in the southern Aegean Sea, while it exceeds 27 days off the Israeli coast. The results demonstrate that the MHW frequency trend increased by 1.2 events per decade between 1982 and 2020, while the MHW cumulative intensity (icum) trend increased by 5.4 °C days per decade. During the study period, we discovered that the maximum significant MHW SST event was 6.35 °C above the 90th SST climatology threshold, lasted 7 days, and occurred in the year 2020. It was linked to a decrease in wind stress, an increase in air temperature, and an increase in mean sea level pressure.

scholarly journals Chlorophyll in the Eastern Mediterranean Sea: Correlations with Environmental Factors and Trends

Environments ◽  
2019 ◽  
Vol 6 (8) ◽  
pp. 98 ◽  
Author(s):  
Dionysia Kotta ◽  
Dimitra Kitsiou
Keyword(s):  
Wind Speed ◽  
Environmental Factors ◽  
Surface Temperature ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Eastern Mediterranean ◽  
Sea Surface ◽  
Sea Level Pressure ◽  
Eastern Mediterranean Sea ◽  
Mean Sea Level

The research on marine chlorophyll concentrations, as indicators of phytoplankton abundance, their relations with environmental parameters, and their trends is of global interest. It is also crucial when referring to oligotrophic environments where maintenance or increase in primary production is vital. The present study focuses on the Eastern Mediterranean Sea that is in general oligotrophic. Its primary goal is to explore possible relations between surface chlorophyll-a concentrations and environmental factors. The involved parameters are the sea surface temperature, the wind speed, the wave height, the precipitation, and the mean sea level pressure; their relation with chlorophyll is assessed through the calculation of the relevant correlation coefficients, based on monthly satellite-derived and numerical model data for the period 1998–2016. The results show that chlorophyll relates inversely with sea surface temperature; in general positively with wind speed and wave height; positively, although weaker, with precipitation; and negatively, but area and season limited, with mean sea level pressure. These correlations are stronger over the open southern part of the study area and strongly dependent on the season. A secondary aim of the study is the estimation of chlorophyll trends for the same time interval, which is performed separately for the low and the high production periods. The statistically significant results reveal only increasing local chlorophyll trends that, for each period, mainly characterize the eastern and the western part of the area, respectively.

scholarly journals Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean

2012 ◽  
Vol 9 (12) ◽  
pp. 19165-19197 ◽  
Author(s):  
C. Theodosi ◽  
C. Parinos ◽  
A. Gogou ◽  
A. Kokotos ◽  
S. Stavrakakis ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Mediterranean Sea ◽  
Aromatic Hydrocarbons ◽  
Elemental Carbon ◽  
Eastern Mediterranean ◽  
Vertical Transport ◽  
Sea Surface ◽  
Ionian Sea ◽  
Eastern Mediterranean Sea ◽  
Polycyclic Aromatic

Abstract. To assess sources and major processes controlling vertical transport of both anthropogenic and natural chemical species in deep basins of the Eastern Mediterranean Sea (SE Ionian Sea, Nestor site), we performed chemical characterization (elemental carbon, major and trace metals and polycyclic aromatic hydrocarbons) of marine sinking particles. Sediment traps were deployed at five successive depths, 700 m, 1200 m, 2000 m, 3200 m and 4300 m from the sea surface, during the period of May 2007 to October 2008. Fluxes of all measured species exhibited minimum values from January to March 2008 and maximum from April to September 2008, with an evident covariance revealing a common and rapid vertical transport mechanism from 700 m down to 4300 m depth. Crustal matter flux from atmospheric deposition plays an important role in the temporal variability of particulate matter with significant contribution from biogenic constituents namely the seasonal succession in the export of planktonic biomass, expressed by particulate organic carbon (POC), carbonates and biogenic Si fluxes (Stavrakakis et al., 2012). Tracers (elemental carbon, retene) of the devastating forest fires occurred in August 2007 in southern Greece, were detected at sediment trap material in all depths with a delay of 15 days at 4300 m, indicating a rapid and well-coupled transport of sinking particulate material between the sea-surface and deep layers of the Eastern Mediterranean Sea. Lateral inputs of pollutants at the deepest trap (4300 m) are probably of importance, due to the influence of deep Adriatic water at the study site.

First records of six species of crustaceans for the eastern Mediterranean Sea

Crustaceana ◽  
2019 ◽  
Vol 92 (11-12) ◽  
pp. 1403-1414
Author(s):  
Ozge Ozgen ◽  
Sermin Acik ◽  
Kerem Bakir
Keyword(s):  
Mediterranean Sea ◽  
New Record ◽  
New Records ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Posidonia Oceanica ◽  
The Other ◽  
Eastern Mediterranean Sea ◽  
Crustacean Species ◽  
Ecological Characteristics

Abstract This paper deals with six crustacean species associated with Posidonia oceanica (Linnaeus) Delile, 1813 meadows along the Aegean coasts of Turkey: Caprella tavolarensis, Eriopisella ruffoi, Iphimedia vicina, Astacilla mediterranea, Apseudopsis minimus and Macropodia deflexa. Apseudopsis minimus is a new record for the Turkish coast of the Aegean Sea, the other five species are new records for the eastern Mediterranean. Brief descriptions of the species and their morphological and ecological characteristics are given.

Regional Mean Sea Surface Model over the Eastern Mediterranean Sea

2020 ◽  
Author(s):  
Milaa Murshan ◽  
Balaji Devaraju ◽  
Nagarajan Balasubramanium ◽  
Onkar Dikshit
Keyword(s):  
Time Series ◽  
Mediterranean Sea ◽  
Sea Level ◽  
Tide Gauge ◽  
Eastern Mediterranean ◽  
Sea Surface ◽  
Surface Model ◽  
Eastern Mediterranean Sea ◽  
Mean Sea Level ◽  
Mean Sea Surface

<p>The Mean Sea Level is not an equipotential surface because it is subject to several variations, e.g., the tides, currents, winds, etc. Mean Sea Level can be measured either by tide gauges near to coastlines relative to local datum or by satellite altimeter above the reference ellipsoid. From this observable quantity, one can derive a non-observable quantity at which the potential is constant called geoid and differs from mean sea surface by amount of ±1 m. This separation is called Sea Surface Topography. In this research, the data of nine altimetric Exact Repeat Missions (Envisat, ERS_1 of 35 days (phase C and G), ERS_2, GFO, Jason_1, Jason_2, Jason_3, Topex/Poseidon and SARAL) were used for computing the regional mean sea surface model over the eastern Mediterranean Sea. The data of all missions together span approximately 25 years from September -1992 to January-2017 and referenced to Topex ellipsoid.  Which is later transformed to WGS84 ellipsoid, as it is chosen to be a unified datum in this study. Prior to computing the altimetric MSS,  altimetric sea surface height measurements were validated  by comparing  time series of altimetric-MSL with mean sea level time series calculated from three in-situ tide gauge measurements.  The sea surface heights values of the derived MSS model is between 15.6 and 26.7 m. And the linear trend slope is between -3.02 to 6.53 mm/year.</p><p>Keywords: Mean Sea Level, Satellite Altimetry, Tide Gauge, Exact Repeat Missions</p>

On the occurrence of Lethocerus patruelis (Stål, 1855) (Hemiptera: Heteroptera: Nepomorpha: Belostomatidae) in Rhodes (eastern Mediterranean Sea)

2019 ◽  
Vol 13 (1) ◽  
pp. 10-14
Author(s):  
MARIA CORSINI-FOKA ◽  
GERASIMOS KONDYLATOS ◽  
IOANNA KATSOGIANNOU ◽  
KONSTANTINOS GRITZALIS ◽  
GIANNI INSACCO
Keyword(s):  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
First Record ◽  
General Distribution ◽  
Eastern Mediterranean Sea ◽  
Aegean Islands

The finding in 2017 of a female of Lethocerus patruelis, a species rarely collected in the Aegean Islands, is documented from Rhodes (Greece), more than 160 years after its first record in the same island. The general distribution of the giant water bug and its occurrence in the area are briefly discussed.Keywords: Belostomatidae, giant water bug, Lethocerus patruelis, Aegean Sea, Rhodes, Greece

scholarly journals Microbial community genomics in eastern Mediterranean Sea surface waters

2009 ◽  
Vol 4 (1) ◽  
pp. 78-87 ◽  
Author(s):  
Roi Feingersch ◽  
Marcelino T Suzuki ◽  
Michael Shmoish ◽  
Itai Sharon ◽  
Gazalah Sabehi ◽  
...  
Keyword(s):  
Microbial Community ◽  
Mediterranean Sea ◽  
Surface Waters ◽  
Eastern Mediterranean ◽  
Sea Surface ◽  
Eastern Mediterranean Sea

Diet composition and temporal changes in the trophic patterns of Plesionika narval (Crustacea-Decapoda) in the Aegean Sea (Eastern Mediterranean Sea)

2019 ◽  
Vol 30 ◽  
pp. 100739
Author(s):  
Leila Bordbar ◽  
Kostas Kapiris ◽  
Aikaterini Anastasopoulou ◽  
Christos D. Maravelias ◽  
Christopher J. Smith ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Diet Composition ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Temporal Changes ◽  
Eastern Mediterranean Sea
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