Short-term variability in primary productivity during a wind-driven diatom bloom in the Gulf of Eilat (Aqaba)
Short-term variability in primary productivity during a wind-driven diatom bloom in the Gulf of Eilat (Aqaba)
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DOI：
10.3354/ame01321
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发表时间：
2009-01-01
影响因子：
1.4
通讯作者：
Marra, John
中科院分区：
文献类型：
--
作者：
Iluz, David;Dishon, Gal;Marra, John
在埃拉特湾（亚喀巴）的北方，2008年4月硅藻生物量和初级生产率急剧增加。在24小时内，硅藻丰度从8 × 10（3）上升到228 × 10（3）cells l（-1），光合速率也相应地从15 μ g Cl（-1）d（-1）增加到35 μ g Cl（-1）d（-1）。水体透明度降低，光合有效辐射（PAR）垂直扩散衰减系数Kd从0.076 m ~（-1）增加到0.090 m ~（-1），真光层深度从60 m减小到45 m。在此期间，还检测到硅藻的二氧化硅沉积显著增加。我们将上述环境特征的变化归因于风力产生的表面电流。测量期间的强风（高达10 m s（-1））使表层的营养物浓度异常高，
In the northern Gulf of Eilat (Aqaba), sharp increases in the biomass of diatoms and rates of primary production occurred in April 2008. Within 24 h, diatom abundance rose from 8 x 10(3) to 228 x 10(3) cells l(-1), and photosynthetic rates concomitantly doubled from 15 to 35 mu g C l(-1) d(-1). Water transparency declined, as indicated by the vertical diffusion attenuation coefficient K-d for photosynthetically active radiation (PAR), which increased from 0.076 to 0.090 m(-1) and decreased the euphotic depth from 60 to 45 m. During this time, a significant increase in silica deposition by the diatoms was also detected. We attribute the mentioned changes in environmental characteristics to wind-generated surface currents. Strong winds (up to 10 m s(-1)) during the measurements enriched the surface layers with unusually high nutrient concentrations within