The Marine Ecosystem and Climate Research Center (DEKOSIM)

The Marine Ecosystem and Climate Research Center (DEKOSIM) was established by the Institute of Marine Sciences of the Middle East Technical University, with the infrastructure support provided in 2012, by the State Planning Organization (DPT) which  now serves as the Turkish Ministry of Development. The center will provide information and technical infrastructure support to all Turkish marine related institutions and organizations and has been designed at a level to compete scientifically with European countries in the fields of marine ecosystem and climate research. Within the scope of DEKOSIM, observation systems that can undertake long-term, continuous measurements in Turkish seas are being established. Such systems include time series, passive measuring devices drifting with currents (ARGO floats) and float systems.

Observation Systems

Erdemli Time Series
Oceanographic time series are measurements taken in situ at the same point over a certain period. Within this scope, a time series (Erdemli Time Series) was initiated in front of the METU - Institute of Marine Sciences campus in Erdemli, Mersin. The time series which started with 3 stations in 1997, continues at eight stations where physical, chemical and biological measurements are periodically recorded. 

ARGO Programme of METU

Argo floats are devices that passively drift with the seawater currents at desired depths periodically recording the physical profile of the water column. In 2013-14, within the scope of DEKOSIM, four Argo floats were released in the Black Sea and two in the Mediterranean. The data obtained by these devices via satellite is fully accessible to all.

Buoy systems
Again within the scope of DEKOSIM, an observation system based on a network of fixed point oceanographic buoys equipped with short time interval oceanographic and meteorological devices has been designed. 

The first of the buoys was installed in October 2015 at a depth of approximately 100 meters at five nautical offshore from the METU- Institute of Marine Sciences.

The observational network will be set up gradually with plans to deploy the second oceanographic buoy in the Black Sea off Sinop.

Contact: 

Assoc. Prof. Dr. Barış Salihoğlu (baris@ims.metu.edu.tr)

Assist. Prof. Dr.  Devrim Tezcan (devrim@ims.metu.edu.tr)

DEKOSIM - Erdemli Time Series (ETS)

Aim of project

Long-term monitoring and investigation of the impact of climate change on marine ecosystems.

The Problem

The Eastern Mediterranean is the region of the world where climate change effects are first expected to be noticed. To monitor and understand the consequence and long-term effects on changes in the physical environment and the marine ecosystem.

Methodology

In the Erdemli time series studies, CTD, nutrient, phytoplankton, chlorophyll-a, zooplankton and trace-pigment samples and measurements are obtained at 9 stations from coastal to offshore waters along a transect at depths of 20, 50, 75, 100, 125, 150, 175, 200 and 500 meters. While CTD profile measurements are made and surface samples collected from all stations, according to profile depths at the 20, 100, 200 and 500 meter stations, additional sampling may be performed at different depths. Some of these measurements are made in the field and the rest in the DEKOSIM laboratories. While CTD profile measurements and surface samples are collected from all stations, according to profile depths at 20, 100, 200 and 500 meter stations, additional sampling may be performed at different depths. CTD measurements for the entire water column ( 1 meter resolution) of salinity, temperature, density (calculated from salinity and temperature measurements), relative fluorescence, oxygen, turbidity and PAR (photosynthetic active radiation) are performed using Seabird SBE 911 plus. Nutrient analysis of Silicate, nitrite, nitrate, ammonia and phosphate is carried out in the laboratory in a 4-channel auto-analyzer. Chlorophyll-a content, relative fluorescence and trace-pigments (14) are also measured in the laboratory by HPLC (High Performance Liquid Chromatography). Phytoplankton specimens are measured by flow cytometry according to length groups and species identification determined microscopically when necessary.

Zooplankton is identified with the group-level Zooscan device enabling the calculation of group biomasses. As long as the ship is stationary and stops at stations, continuous flow measurements are made with the ADCP at the bottom of the ship and continuous fluorescence measurements are carried out in the seawater pumped from the surface.

While the ship is in motion and for the duration it stops at the stations, continuous flow measurements are made with the ADCP located on the base of the ship and continuous fluorescence measurements are carried out in the seawater pumped from the surface.