Solubility of Atmospheric Nutrients over the Eastern Mediterranean: Comparison between Pure-Water and Sea-Water, Implications Regarding Marine Production

Çözünürlük deneyleri gerçekleştirmek amacıyla Doğu Akdenizin kıyısında konuşlanmış Erdemli istasyonuna ait örnek kütüphanesinden aerosol filtre örnekleri seçilmiştir. Besin tuzu çözünürlükleri (PO43-, Sidiss, NO3-and NH4+ ) saf-su ve denizsuyu kullanılarak incelenmiştir. Fosfat ve silikatın aritmetik ortalamaları saf-su ve deniz-suyu arasında belirgin (% 50den fazla) bir fark gösterirken nitrat ve amonyum için hesaplanan ortalamalar saf-su ve deniz-suyu ekstraksiyonlarında belirgin bir fark ortaya koymamıştır. Fosfat ve silikat için gözlenen fark pH, deniz suyu iyon şiddeti, parçacık boy dağılımı ve fosfat/silikatın kalsiyum fosfat, kaolinit, opal, kuvars gibi az çözünebilir parçacıklara eşlik etmesine ve aerosol türlerinin menşeine atfedilebilir. Nitrat ve amonyum için saf-su ve deniz-suyu ekstraksiyonlarındaki fark, sırasıyla %1 ve %-3, olarak hesaplanmıştır. Bu benzerlik, yüksek çözünebilirlik gösteren NH4NO3 , Ca(NO3 )2 , NaNO3 (NH4 )2SO4 ve NH4HSO4 kimyasal forumlara atfedilebilir. Hesaplamalar atmosferik P akısının, Kilikya Baseninin kıyı ve açık suları için rapor edilen birincil üretimin %0,4 ve %0,9 destekleyebileceğini ortaya koymuştur. Diğer yandan, kıyı ve açık sulardaki birincil üretime atmosferik azot katkısı sırasıyla %3,7 ve %8,4 tespit edilmiştir. Atmosferik girdinin denizsel üretim üzerine etkisi özellikle tabakalaşmanın görüldüğü yaz ve sonbahar gibi dönemlerde daha önemli hale gelmektedir. Bu dönemlerde, atmosferik P girdisi birincil yeni üretimin %80ni karşılayabilirken atmosferik azot girdisi yüzey sularda belirlenen birincil yeni üretimin sekiz katını destekleyebilmektedir.

Doğu Akdeniz üzerindeki Atmosferik Besin Tuzlarının Çözünürlüğü: Saf-Su ve Deniz-Suyu Arasında Kıyaslama, Denizsel Üretim Konusunda Değerlendirme

Aerosol filter samples were selected from sample library of Erdemli site; located on the coastline of the Eastern Mediterranean, in order to carry out solubility experiments. The nutrient (PO4 3- , Sidiss, NO3 - and NH4 + ) solubilities were investigated by using pure-water and sea-water. The arithmetic means of phosphate and dissolved silica indicated distinct difference (larger than 50 %) between pure-water and sea-water whereas; the calculated mean concentrations of nitrate and ammonium did not reveal substantial discrepancy for pure-water and sea-water extractions. The difference for phosphate and silicate might be attributed to pH and ionic strength of sea water, size distribution and association of phosphate/silicate particles with less soluble compounds such as calcium phosphate, kaolinite, opal, quartz and origin of the aerosol species. The difference between pure-water and sea-water extractions for nitrate and ammonium was estimated to be small, corresponding to 1-3%. This similarity can be ascribed to highly soluble chemical forms such as NH4NO3 , Ca(NO3 )2 , NaNO3 (NH4 )2SO4 and NH4HSO4 . Calculations revealed that atmospheric P flux would sustain 0.4% and 0.9% of the primary production reported for coastal and offshore waters of Cilician Basin. Whereas, atmospheric nitrogen contribution on primary production would be as high as 3.7% and 8.4% in coastal and offshore waters, correspondingly. The impact of atmospheric input on the marine productivity became more important particularly during the stratified periods such as summer and autumn. During these period, atmospheric P input might sustain 80% of the new production whereas, atmospheric N input might support 8 times higher new product than that detected for surface waters.

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