Temporal and spatial changes of primary productivity the sea of Marmara obtained by remote sensing

İkis, Didem
Temporal and spatial variations in the Sea of Marmara based on monthly averages of chlorophyll a, which is the major indicator of phytoplankton biomass and primary production, recorded by SeaWiFS and MODIS-Aqua sensors at nearly 100 stations have been analyzed for the period of 1997-2007. Majority of phytoplankton blooms occur during the winter and spring seasons, followed by a smaller secondary bloom during the fall season. The majority of high magnitude blooms occur at the Eastern part of the Sea which may be attributed to an increase in the amount of discharge of water contaminated with nutrients originating on land where the industries are located. The correlations between monthly averages of sea surface temperature (SST) and corresponding chlorophyll a values are statistically significant (inverse) at 1% level, where r= -0.53 and the equation of the fitted model is: Chlorophyll a = 7.09199 0.215402* SST This correlation is expected because a relative decrease in SST is an indicative of upwelling and vertical mixing which are the primary processes for the formation of phytoplankton blooms. We have also found that monthly averages of chlorophyll a recorded by SeaWiFS and MODIS-Aqua are nearly identical and either data set can be used in place of the other.


The impact of hard data uncertainty in reservoirs modelling
Fadlelmula, M.m.; Akın, Serhat; Duzgun, H.s. (null; 2017-01-01)
Predicting and estimating real world conditions presents one of the major ways in which uncertainty is introduced to reservoir modelling, with errors often occurring due to the scarcity of subsurface geological information. The inherently random nature of physical phenomena is another source of uncertainty. While uncertainty due to physical phenomena cannot be reduced - because it is a state of nature - developing more accurate models and collecting additional data can help decrease estimation uncertainty. ...
Seasonal and spatial variation of bacterial production and abundance in the northern Levantine Sea
YUCEL, N. (National Documentation Centre (EKT), 2017-3-13)
Spatial and temporal heterogeneity in bacterial production and abundance in relation to ambient bio-physicochemical parameters has been investigated in the Levantine Sea. Five stations with different trophic states in an area extending from highly eutrophic Mersin bay to the mesotrophic Rhodes gyre area including the oligotrophic offshore waters were sampled four times. Integrated bacterial production varied between 6.1 and 90.3 g C m(-2) d(-1) with higher rates occurring during September 2012 in offshore w...
Spatial and Temporal Variations of Inorganic and Organic Forms of Phosphorus in the Surface and Deep Waters of Erdemli Shelf Zone of Mersin Bay
DOĞAN SAĞLAMTİMUR, NESLİHAN; Tuğrul, Süleyman (2013-01-01)
The aim of this study was to understand spatial and temporal variations of inorganic and organic forms of phosphorus in the surface and deep waters of Erdemli shelf zone of the Mersin Bay. For this goal, timeseries hydrographical and phosphorus data were obtained monthly at the three selected stations between December 2001 and December 2003. The present results have shown that the concentrations of different fractions of total phosphorus displayed a decreasing trend from nearshore to shelfbreak zone of the ...
Numerical simulation of advective Lotka-Volterra systems by discontinuous Galerkin method
Aktaş, Senem; Karasözen, Bülent; Uzunca, Murat; Department of Scientific Computing (2014)
In this thesis, we study numerically advection-diffusion-reaction equations arising from Lotka-Volterra models in river ecosystems characterized by unidirectional flow. We consider two and three species models which include competition, coexistence and extinction depending on the parameters. The one dimensional models are discretized by interior penalty discontinuous Galerkin model in space. For time discretization, fully implicit backward Euler method and semi-implicit IMEX-BDF methods are used. Numerical ...
Vertical profiles of particulate organic matter and its relationship with chlorophyll-a in the upper layer of the NE Mediterranean Sea
EDİGER, DİLEK; Tugrul, S; Yılmaz, Ayşen (2005-04-01)
Particulate organic matter (POM), nutrients, chlorophyll-a (CHL) and primary production measurements were performed in the upper layer of three different regions (cyclonic, anticyclonic and frontal+peripherial) of the NE Mediterranean Sea in 1991-1994. Depth profiles of bulk POM exhibited a subsurface maximum, coinciding with the deep chlorophyll maximum (DCM) established near the base of the euphotic zone of the Rhodes cyclone and its periphery, where the nutricline was situated just below the euphotic zon...
Citation Formats
D. İkis, “Temporal and spatial changes of primary productivity the sea of Marmara obtained by remote sensing,” M.S. - Master of Science, Middle East Technical University, 2007.