Current work concentrated on long-time SST and Chlorophyll-a pigment concentration of Lake Van using Modis-Aqua acquired data. Investigating the relationship between sea surface temperature (SST) and chlorophyll-a (Chl-a) increases our understanding of marine ecosystem and also provide us to assess the effect on aquatic animals that may arise as a result of changes in the environment. Long term Sea Surface Temperature variability and its relationship with chlorophyll-a pigment of phytoplankton biomass were investigated by using MODIS-Aqua (Moderate Resolution Imaging Spectroradiometer) satellite imagery. SST and Chl-a acquired from MODIS-Aqua showed seasonal, annual and interannual variability of temperature. Monthly variability Chl-a from MODIS 2002 to 2020 also investigated, significant correlation between SST and Chl-a was not found P<0.05. First PCA of SST seems to show general average pattern of the lake, on the other hand PCA's of Chl-a could not be calculated due to lack of null pixels within images.

Long term Sea Surface Temperature variability and its relation with, chlorophyll (chl) pigment of phytoplankton biomass were investigated using SeaWiFS (Sea-viewing Wide Field of-view Sensor) and AVHRR (Advanced Very High Resolution Radiometer) satellite imagery. SST acquired from AVHRR (1985 to 2009) showed seasonal, annual and interannual variability of temperature. Monthly variability chl from SeaWiFS 1985 to 2009 has also been investigated, Correlation between SST and chl was found to be 78% and significant at P<0.05.Keywords: SST, Phytoplankton, AVHRR, SeaWiFS, EOF, Caspian Sea. Uzun Periyodda Hazar Denizinin Su Yüzeyi Sıcaklığının Değişkenliği ve Değişkenliğin Fitoplanktonla İlişkisinin AVHRR ve SeaWiFS Uydularından Alınan Verilerle İncelenmesi ÖzetBu çalışmada Hazar Denizi'nin 24 yıllık, mevsimsel su yüzeyi sıcaklığı ve bu sıcaklığın fitoplanktonla ilişkisi AVHRR (Çok Yüksek Çözümlemeli Radyometre) ve SeaWiFS (Sea-viewing Wide Field of-view Sensor) uydu verileri kullanılarak incelenmiştir. Çalışmanın en önemli sonucu fitoplankton ile su yüzeyi sıcaklığını %78 oranında korelasyon göstermesidir (P<0,05).

(climate, meteorology, oceanography, hydrography, biology, environmental science, agriculture, tourism, such as Industry) will create a data source. SST patterns also revealed oceanographic events which was studied in earlier work too.

Current study is investigated chlorophyll-a (Chl-a) pigment concentration and its relationship with Sea Surface Temperature (SST) using cloud-free high resolution 59 Landsat-The Operational Land Imager (OLI) images from May 2013 to September 2018 covering Lake Van of Turkey. In addition, the concentrations of coccolithophore which is a kind of phytoplankton was also studied using the same method. The fact that Van Lake is extremely rich in terms of aquatic life has led to the investigation of the factors affecting the marine habitat. Therefore, SST, Chl-a concentrations, as well as the relationship between them and coccolithophore concentrations were investigated to evaluate marine life and ecosystem in the Lake. Satellite-generated data can provide information about the marine life in a particular area worldwide. Coccolithophore, SST and Chl-a were obtained from high resolution 59 Landsat OLI using SeaDAS software. Aforementioned parameters were extracted from images using SeaDAS's OCSSW L2GEN module and then output processed by QGIS (Open Source Geographic Information System) to conduct statistical calculation. Negative correlation coefficients of 74% and 73.7% were found for 2014 and 2017, respectively, and these were not statistically significant. Although the information does not give meaningful results, it may be useful in future studies about the effects of global temperature changes and the marine life for particular region.

Many studies have been made on the relationship between SST (sea surface temperature) and chlorophyll, for instance by [1,2,3,4].The upwelling event, due to the interface between cold and warm water masses brings nutrients up from deep waters which is attractive to plankton and therefore it is possible to detect likely areas for plankton concentration by monitoring the sea temperature [5]. Normally the carbon dioxide in the atmosphere is in balance with the carbon dioxide in the ocean. During photosynthesis phytoplankton remove carbon dioxide from seawater and release oxygen as a by-product. This allows the oceans to absorb additional carbon dioxide from the atmosphere. If fewer phytoplankton existed, atmospheric carbon dioxide would increase. Phytoplankton also affect c a r b o n d i o x i d e l e v e l s w h e n t h e y d i e . Phytoplankton, like plants on land, are composed of substances that contain carbon. Dead phytoplankton can sink to the ocean floor. Other material sinking to ocean bottom soon covers the phytoplankton. In this way, the ocean act as a sink, a place to dispose of global carbon, which otherwise would accumulate in the atmosphere as carbon dioxide. Other global sinks include land vegetation and soil. However the carbon sinks are frequently returned to the atmosphere as carbonDeforestation contributes to the accumulation of carbon dioxide in the atmosphere by reducing the removal of carbon dioxide. Carbon dioxide acts as a 'greenhouse' gas in the atmosphere, and therefore an increase in its concentration may contribute to global warming. The increase of carbon dioxide means less long-wavelength energy emitted from the Earth can escape to space. This would lead to a gradual warming of the Earth, but there are other factors that could counteract this warming effect. This would lead to a gradual warming of the Earth, but there are other factors that could counteract