Okuş E, Asian-Yilma A, Yüksek A, Taş S, Tüfekçi V
Institute of Marine Sciences and Management, University of Istanbul, Vefa, Turkey.
Water Sci Technol. 2002;46(8):59-66.
As part of a five years monitoring project "Water Quality Monitoring of the Strait of Istanbul", February-December 1999 nutrient dynamics of the Black Sea-the Sea of Marmara transect are studied to evaluate the effect of discharges given by deep disposals. Through a one-year study, upper layer nutrient concentrations were generally under the effect of northwestern-shelf Black Sea originated waters. This effect was strictly observed in July, when the upper layer flow was the thickest. On the other hand, partly in November but especially in December the northwestern-shelf Black Sea originated water flow was a minimum resulting in similar concentrations in both layers. Nutrient fluctuations also affected the chlorophyll a and POC concentrations as parameters of productivity. The nutrient concentrations decreased with the effect of spring bloom and highest chlorophyll a values were detected in November at Strait stations that did not match to the Sea of Marmara values. This fact represents the time-scale difference between the Black Sea and the Sea of Marmara. On the contrary, high nutrient concentrations in the lower layer (especially inorganic phosphate), and therefore low N:P ratios reflect the effect of deep discharge. Vertical mixing caused by meteorological conditions of the shallow station (M3) under the effect of surface discharges resulted in homogenous distribution of nutrients. Nutrient concentrations of the stations affected by deep discharge showed that the two-layer stratification of the system did not permit the discharge mix to the upper layer.
作为“伊斯坦布尔海峡水质监测”五年监测项目的一部分，于1999年2月至12月对黑海 - 马尔马拉海断面的营养动力学进行了研究，以评估深层排放的影响。通过为期一年的研究，上层营养物浓度总体上受源自黑海西北大陆架的海水影响。这种影响在7月上层水流最厚时被严格观察到。另一方面，部分在11月，但特别是在12月，源自黑海西北大陆架的水流最小，导致两层中的浓度相似。营养物波动也影响了作为生产力参数的叶绿素a和颗粒有机碳浓度。营养物浓度随着春季水华的影响而降低，并且在11月在海峡站点检测到最高的叶绿素a值，这些值与马尔马拉海的值不匹配。这一事实代表了黑海和马尔马拉海之间的时间尺度差异。相反，下层中的高营养物浓度（特别是无机磷酸盐），因此低氮磷比反映了深层排放的影响。在表层排放影响下，浅海站点（M3）的气象条件引起的垂直混合导致了营养物的均匀分布。受深层排放影响的站点的营养物浓度表明，该系统的两层分层不允许排放物混合到上层。
