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| Identifier |
000372979 |
| Title |
Προέλευση οργανικού και στοιχειακού άνθρακα σε ιζηματοπαγίδες της Ανατολικής Μεσογείου |
| Alternative Title |
Origin of organic and inorganic carbon from sediment traps of Eastern Mediterranean Sea |
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Author
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Κόκκοτος, Αθανάσιος Κων.
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Thesis advisor
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Μιχαλόπουλος, Νικόλαος
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| Abstract |
This study focus on the fate of organic and inorganic carbon , phosphorus and metals in the sediments of different depths of the East Mediterranean sea. Thermo-Optic method (SUNSET) was used for the determination of organic/inorganic carbon, ascorbic acid method was used for the determination of phosphorus and ICP-MS method for the determination of metals. The measurements take place between May 2007-Octomber2008 for the depths 700m, 1200m, 2000m, 3200m and 4000m.
Through the study of the total mass flux of all elements we found that the East Mediterranean sea is a very heterogeneous ecosystem. The changes of these total mass fluxes by season showed the existence of three maximums (Sprig, Summer and Autumn). Maybe a reason about the Spring and Summer’s maximum is the blossom of plankton which start to grow up in Spring and last till Summer. The Autumn’s maximum maybe is a second bloom which takes place this season. Another major factor about these three maximums maybe is the atmospheric deposition of nutritional or non components in the sea by natural sources (Sahara’s dust) and human sources (forest fires, diesel machines etch.)
In order to investigate better the regression between sea’s productivity and atmospheric deposition of components it’s appropriate to determine all these factors which are critical for the blossom of sea’s productivity. So, we calculate the ratio C/N. The values of this ratio was between 9.39-10.25, values which are very close to these of the Redfield’s ratio values (Redfield=6,6). This means that the East Mediterranean sea is a poor nourishing system, something which is more obvious
from the minimum rate( 2,6-3.7%) of organic matter in the total mass of the sea’s matter.
The sediments analyzed to specify their components which are organic matter (5.1%-7.6%), CaCO3 (5.3%-7.5%), dust (52,1%-57,4%), elemental carbon (2,5%-2,9%) and an estimated Si (28.7%-33.9%) . It’s obvious from these values that the major components of the sediments are dust and Si, the organic matter is at the same level very low in contrast with the values of dust and Si something which enforce the conviction that East Mediterranean sea is a pour nourishing system. The elemental carbon’s value is the lowest because the source of this element is not natural but human.
The next step was the regression analysis by a p-test (p ≤ 5*10 -2 ) of the changes of the total mass fluxes of all components in all depths. This show us that there is a high regression between all our samples in all depths for the period which measurements took place.
So after all these calculations, we propose through this study that the suspended particles which are on the surface of the sea by the atmospheric deposition aggregate in bigger particles which go deeper because of gravity and the vertical mixing of the water.
At the end we correlate the total mass of all depths with the two biggest fire forests which took place between 2007 (Elia’s region) and 2008 (Caucasus).
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| Language |
Greek |
| Issue date |
2011-12-21 |
| Collection
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School/Department--School of Sciences and Engineering--Department of Chemistry--Post-graduate theses
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Type of Work--Post-graduate theses
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| Permanent Link |
https://elocus.lib.uoc.gr//dlib/d/3/0/metadata-dlib-1331627154-696136-480.tkl
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| Views |
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