Türkiye Denizleri Işık Etkileşimleri

Işık ekosistemlerin birincil enerji kaynağı olmasından dolayı oldukça önemlidir. Bu çalışmada, Türkiye deniz alanlarında ışık özellikleri ve deniz suyu etkileşimlerini anlama ve zaman içerisindeki eğilimlerini değerlendirmek amacıyla Eylül 1997 ile Mart 2017 arasında uzaktan algılama ile elde edilen veri seti kullanılmıştır. Değerlendirme ışık yoğunluğunun göstergesi olarak fotosentetik olarak aktif ışıma (PAR), deniz suyu etkileşiminin göstergesi olarak ise Öfotik derinlik (Zeu) ve PAR sönümlenme katsayısı (KdPAR) değişkenleri üzerinden yapılmıştır. Bulgular ortamdaki ışık yoğunluğunun zamana bağlı değişiklik göstermemekle birlikte, Türkiye deniz alanlarında Zeu genellikle artış eğiliminde olduğunu ve bu durumla ilişkili olarak KdPAR yalnızca Karadeniz’de azalma eğiliminde olduğunu göstermiştir. Sonuç olarak, ışık yoğunluğundan öte, deniz suyundaki optik olarak aktif maddelerin ışık etkileşimindeki değişimleri belirlediği anlaşılmıştır. Bu çalışmada sunulan parametrelerin, farklı bölgelerde geliştirilmiş deneysel ilişkilerden üretilen parametreler yerine model çalışmalarında kullanılmasının belirsizliği azaltmak konusunda avantaj sağlayacağı düşünülmektedir.

Anahtar Kelimeler:

Türkiye denizleri, ışık, fotosentetik olarak aktif ışıma, Öfotik derinlik, sönümlenme katsayısı

Light Interactions of Turkish Seas

In this study, data sets obtained by satellite remote sensing were used to understand light characterization and sea waterlight interactions and evaluate inter-annual trends between September 1997 and March 2017. Photosynthetically active radiation (PAR) in terms of light intensity, and Euphotic depth (Zeu) and attenuation coefficient (KdPAR) in terms of lightseawater interaction were used for descriptive and time series analysis. As a result of this study, PAR showed no differences over the time period, while Zeu (mostly increasing) and KdPAR generally showed significant trends in the regions. It can be concluded that optically active constituents determine the interaction rather than light intensity in the regions. Additionally, it is expected that using these parameters in modelling studies will provide an advantage on reducing uncertainties that come from globally used bio-optical empirical relationships.

Keywords:

Turkish Seas, light, photosynthetically active radiation, euphotic depth,

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