Unit:
Τομέας ΙΙΙ [Ανόργανη Χημεία – Ανόργανη Χημική Τεχνολογία – Περιβαλλοντική Χημεία]Library of the School of Science
Dissertation committee:
Μιχαήλ Σκούλλος Ομότ. Καθηγητής (Επιβλέπων), Ζέρη Χριστίνα Ερευνήτρια Β΄, Τζώρτζιου Μαρία Αναπλ. Καθηγήτρια
Original Title:
Properties and dynamics of Chromophoric Dissolved Organic Matter (CDOM) in Eastern Mediterranean Waters
Translated title:
Ιδιότητες και δυναμική της Χρωμοφόρου Διαλυτής Οργανικής Ύλης (CDOM) σε υδάτινα οικοσυστήματα της Ανατολικής Μεσογείου
Summary:
The purpose of this study is to investigate the optical properties of Dissolved
Organic Matter (DOM) and to gain information regarding the nature and
transformation processes of DOM in a large region of the Eastern Mediterranean
Sea covering the Marmara Sea, the North-Central and South Aegean Sea, the
Ionian Trench and Northwestern Levantine Sea as well as Sperchios River and
Maliakos Gulf. A secondary purpose of this study is to get insights into
autochtonous CDOM production. Chromophoric Dissolved Organic Matter (CDOM) and
Fluorescent Dissolved Organic Matter (FDOM) are used for the characterization
of the optical properties of DOM but they can also provide information about
DOM composition and track transformation processes. In order to achieve the
purposes of this study, absorption spectra in the UV-visible region and
fluorescence Excitation and Emission Matrices (EEMs) were obtained while
Parallel Factor Analysis (PARAFAC) was applied for the identification of the
fluorescent components. Our results show the distinct optical print of rivers
and that their influence in the coastal waters is better tracked through
fluorescence analysis. CDOM/FDOM dynamics at the surface of Marmara Sea deviate
from the observed summer pattern in open seas while Black Sea Water (BSW)
outflowing the Dardanelles introduce significant amounts of CDOM, amino
acid-like and humic-like substances in North Aegean Sea (NAS). The influence of
BSW and the established optical properties in NAS presents seasonal variations.
Photodegradation appears to be a major sink of CDOM and humic substances at the
surface layer of the Aegean Sea. Contrary in mesopelagic and bathypelagic
layers microbial activity seems to leed to the depletion of amino acid-like
substances and the production of humic nature DOM. Overall our results suggest
that CDOM and FDOM can provide important information regarding DOM composition
and its dynamics (sources and sinks) in various water bodies.
Keywords:
CDOM, FDOM, Absorption, Fluorescence, PARAFAC Analysis
Number of index pages:
13-18
Number of references:
306
