SEASONAL TO DECADAL VARIABILITY IN THE PHYSICAL AND BIOLOGICAL PROPERTIES OF THE BLACK SEA AND LEVANTINE BASIN AS INFERRED FROM SATELLITE REMOTE SENSING

Download

10127561.pdf

Date

2016-12-10

Author

Akpınar, Anıl

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

154
views

105
downloads

Black Sea and Eastern Mediterranean (Levantine basin) have gone through a number of documented changes in the recent decades. Recently acquired satellite data document rapid warming, increased sea level and decreased chlorophyll-a (phytoplankton) in the Black Sea and Levantine basin. Aim of this study is to address warming in the Black Sea and Levantine basin, as well as to investigate the phytoplankton response to changing environmental conditions at seasonal to interannual timescales. In the first part of the study, sea surface temperature (SST) in the Black Sea and Levantine were investigated over the study period 1982-2012. Warming trends, thermal anomalies and results of an empirical orthogonal functions analysis (EOF) was used to interpret the spatiotemporal variability of SST in the Black Sea and Levantine basins. In the second part of the study, changes in Chlorophyll-a were investigated for the Black Sea and Levantine basin as well as its responses to changes in physical environment. EOF analysis were conducted on weekly datasets of chlorophyll-a (CHL-A), sea surface temperature (SST) and absolute dynamic topography (ADT) for 1998-2012. EOF analysis was utilized to investigate the variability at seasonal and interannual time scales. Response of CHL-A to SST and ADT as well as to riverine and heat fluxes were investigated. The first part of the study documented intense warming in the Black Sea and less intense warming in the Levantine basin, both displaying spatio-temporal variability. The second part of the study documented that the Black Sea chlorophyll-a decline as a result of changing wind pattern, eventually changing the intensity of the circulation, whereas in the Levantine basin, chlorophyll-a decline was linked to decreased winter convective mixing. This thesis documents the impacts of global change on physics and biology of the Black Sea and Levantine basin, providing an insight into possible consequences of global warming in the regional seas.

Subject Keywords

Black Sea, Levantine basin, physical-biological interactions, global warming, remote sensing

URI

https://hdl.handle.net/11511/95092

Collections

Graduate School of Marine Sciences, Thesis

Suggestions

OpenMETU
Core

Seasonal Changes in the Composition and Abundance ofZooplankton in the Seas of the Mediterranean Basin Kovalev, Av; Mazzocchı, Mg; Toklu Alıçlı, Benin; Skryabın, Va; Kıdeyş, Ahmet Erkan (2003-01-01) Seasonal changes in the composition, abundance and biomass of zooplankton in the seas of the Mediterranean basin (the Mediterranean, Black and Azov seas) have been reviewed using our own data and data from the literature. In the deep-water central regions of the seas, the seasonal cycle of zooplankton abundance is characterised by one maximum occurring in spring or summer. In the coastal regions, two to three peaks (spring, summer and autumn) exist for the zooplankton abundance. The amplitude of seasonal fl...
Abrupt transition of the northwestern Black Sea shelf ecosystem from a eutrophic to an alternative pristine state Oguz, Temel; Velikova, Violeta (2010-01-01) Long-term (1960-2005) ecological data were used to identify a regime shift in the northwestern Black Sea shelf and to assess whether it has recovered from its former eutrophic state. Following the collapse of fish stocks and the population explosion of the ctenophore Mnemiopsis leidyi between 1988 and 1991, anthropogenic P-PO4 loads from the River Danube dropped strongly in 1992-1993. This decline in P-PO4 levels was caused by reductions in fertilizer use and emissions from land-based point sources during t...
Vertical distribution of marine cyanobacteria Synechococcus spp. in the Black, Marmara, Aegean, and eastern Mediterranean seas Uysal, Zahit (2006-01-01) The vertical distributions of the unicellular cyanobacteria Synechococcus were studied in several highly contrasting seas: the Black Sea, Sea of Marmara, Aegean Sea, and Mediterranean Sea. Cell abundances varied significantly on both vertical and horizontal scales in all physically and spatially discrete water masses. Epifluorescence microscope cell counts from all seas clearly showed that majority of the population remains suspended in the surface-mixed layer and decreases gradually towards the base of the...
A review of zooplankton investigations of the Black Sea over the last decade Kıdeyş, Ahmet Erkan; Shulman, G; Gordina, A; Bingel, F (2000-03-01) Investigations performed in the last decade indicate that there have been important changes in the zooplankton composition and structure in the Black Sea. However, contrasting events taking place in different regions of the Black Sea indicate a non-uniform structure of its ecosystem.
Seasonality of zooplankton in the Southern Black Sea and genetics of Calanus Euxinus (Copepoda) Ünal, Ebru; Kıdeyş, Ahmet; Graduate School of Marine Sciences (2002) Seasonality and composition of zooplankton was comparatively studied at two stations (inshore and offshore) off Sinop, in southern Black Sea in 1999. Intra-specific genetic differentiation of the copepod Calanus euxinus dwelling in different layers along the water column was also investigated in samples obtained from different regions of the southern Black Sea in September 2000. A total of 64 zooplankton species were identified in the Sinop region in 1999, most of which being meroplankton. Out of these, 17 ...

Citation Formats

A. Akpınar, “SEASONAL TO DECADAL VARIABILITY IN THE PHYSICAL AND BIOLOGICAL PROPERTIES OF THE BLACK SEA AND LEVANTINE BASIN AS INFERRED FROM SATELLITE REMOTE SENSING,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.