Title Svojstva i dinamika promjena organske tvari u Jadranu Title (english) Properties and dynamics of organic matter changes in the Adriatic Author Jelena Dautović Mentor Vjeročka Vojvodić (mentor)Committee member Irena Ciglenečki-Jušić (predsjednik povjerenstva)Committee member Božena Ćosović (član povjerenstva)Committee member Ivica Vilibić (član povjerenstva)Committee member Tamara Đakovac (član povjerenstva)Granter University of Zagreb Defense date and country 2019-02-25, Croatia Scientific / art field, NATURAL SCIENCES Universal decimal classificationUDC ) 55 - Geology. Meteorology. Hydrology Abstract Organski ugljik važan je indikator globalnih promjena te sudjeluje u mnogim
biogeokemijskim procesima u moru. Ovaj rad dokumentira dinamiku promjena sadržaja i
svojstava otopljene organske tvari/ugljika, u odabranim područjima Jadrana koja su pod jakim
utjecajem unosa slatke vode kao i različitih vodenih masa: sjeverni Jadran (SJ) na profilu Rovinj
– rijeka Po, Boka kotorska i albanski šelf. Ispitivani su sadržaj i svojstva otopljenog organskog
ugljika (eng. DOC), partikularnog organskog ugljika (eng. POC) te površinski aktivnih tvari
(PAT). Varijabilnost i trendovi u promjeni sadržaja i svojstava organske tvari u SJ u
vremenskom razdoblju od 28 godina ukazuju na vrlo dinamičan sustav na prostornoj, a posebno
na vremenskoj skali. Rezultati također pokazuju da je područje SJ dominantno oligotrofno, s
kraćim, vrlo izraženim eutrofnim/mezotrofnim epizodama. Svojstva i sadržaj organske tvari u
sjevernom Jadranu pod jakim su utjecajem promjenjivog unosa slatke vode rijekom Po te pod
utjecajem advekcije vodenih masa koje ulaze u Jadransko more iz Mediterana tijekom različitih
tipova cirkulacija u sjevernom Jonskom moru uvjetovanih Jadransko-jonskom bimodalnom
oscilacijom (BiOS). U vremenskom razdoblju u kojem su istraživana sva tri područja (03/2008-
05/2009), najadsorbabilniji, to jest najreaktivniji organski materijal nađen je u području Boke
kotorske (ali bez naznaka eutrofnosti), po svojstvima bliži adsorbabilnijim modelnim spojevima
dekstranu T-500 i fulvičnoj kiselini. Slično je pokazano i u jednokratnoj proljetnoj analizi tada
oligotrofnog albanskog šelfa.
Varijabilnost reaktivnosti otopljene organske tvari u SJ tijekom ovog dugogodišnjeg ispitivanja
je bila izraženija nego u ostala dva istraživana sustava. Svojstva organske tvari mijenjala su se
od reaktivnijeg, adsorbabilnijeg materijala sličnog fulvičnoj kiselini i dektranu T-500, do slabije
adsorbabilnog, odnosno manje reaktivnog organskog materijala predstavljenog modelom
visokokomolekularnog polisaharida ksantana.
Abstract (english) Organic carbon is an important indicator of global change and is a constituent of
many biogeochemical processes in the sea. In this thesis organic matter/carbon properties,
variability and dynamics in selected areas of the Adriatic (which differ in freshwater influence
as well as advected water masses) are shown: transect Rovinj – Po in the northern Adriatic
(NA), Boka Kotorska Bay and Albanian shelf. Organic matter in selected areas was monitored
regarding its concentration (dissolved organic carbon, DOC; particulate organic carbon, POC)
and properties (surface active substances, SAS). The NA was investigated for a period of 28
years. Through investigations of 28-years long time series, it is shown that the NA organic
matter has high temporal and spatial variability. Oligotrophic conditions are common in the
NA, yet with short but very strong eutrophication episodes. Properties and concentration of
organic matter in the NA appears to be under strong local influence of the Po River load, but
also under the influence of different water masses entering the Adriatic from the Mediterranean
caused by the Adriatic-Ionian Bimodal Oscillating System (BiOS). During the period when all
three areas were investigated (03/2008-05/2009), the most adsorbable (hence the most reactive)
organic material was found in the Boka Kotorska Bay (with no signs of eutrophication), whose
properties are close to more adsorbable model substances such as dextran T-500 and fulvic acid
(FA). Similar finding was documented for the single analysis carried out on the oligotrophic
Albanian shelf.
Reactivity of the dissolved organic matter in the NA during this long-term investigation is
shown to be the most variable of all investigated areas. Organic matter properties changed from
more reactive/adsorbable material, close to FA and dextrane T-500 in properties, to less
adsorbable/reactive organic material close to high molecular polysaccharide xanthan in
properties.
Keywords
otopljeni organski ugljik (DOC)
partikularni organski ugljik (POC)
površinski aktivne tvari (PAT)
normalizirana površinska aktivnost (NPA)
morska voda
utjecaj slatke vode
Jadransko-jonska bimodalna oscilacija (BiOS)
sjeverni Jadran
Boka kotorska
albanski šelf
Keywords (english)
dissolved organic carbon (DOC)
particulate organic carbon (POC)
surface active substances (SAS)
normalized surfactant activity (NSA)
seawater
freshwater influence
Adriatic-Ionian Bimodal Oscillating System (BiOS)
northern Adriatic
Boka Kotorska Bay
Albanian shelf
Language croatian URN:NBN urn:nbn:hr:217:995839 Study programme Title: Interdisciplinary doctoral study in Oceanology Type of resource Text File origin Born digital Access conditions Open access Terms of use Created on 2019-05-03 08:49:20
