Surface biological, chemical, and optical properties of the Patagonian Shelf coccolithophore bloom, the brightest waters of the Great Calcite Belt
Surface biological, chemical, and optical properties of the Patagonian Shelf coccolithophore bloom, the brightest waters of the Great Calcite Belt
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DOI：
10.4319/lo.2014.59.5.1715
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发表时间：
2014-09
影响因子：
4.5
通讯作者：
W. Balch;D. Drapeau;B. Bowler;E. Lyczkowski;Laura C Lubelczyk;Stuart C. Painter;A. Poulton
中科院分区：
文献类型：
--
作者：
W. Balch;D. Drapeau;B. Bowler;E. Lyczkowski;Laura C Lubelczyk;Stuart C. Painter;A. Poulton
我们报告的表面观测中尺度的颗石藻水华在2008年12月期间的巴塔哥尼亚大陆架的陆架断裂，代表dennalous颗石藻人口在南大洋。在福克兰群岛东北部的福克兰群岛洋流中，水华最为强烈。水华沃茨以埃米利亚藻（Emiliania huxleyi）为主，混合埃米利亚藻（E.西侧为Huxleyi和原甲藻（Prorocentrum sp.）的甲藻群落，东侧为硅藻、甲藻和鞭毛虫的混合群落。颗石光散射的光学测量，方解石的分析测量和显微镜计数都表明这是一个强烈的颗石藻水华。平均颗粒无机碳每颗球石在盛开是低的，典型的B颗球石形态和协议的独立测量扫描电子显微镜。当残余硝酸盐（定义为[NO3−1] − [Si（OH）4]之差）为10-17 µmol L−1且硝酸盐与磷酸盐之比接近Redfield值时，观察到最高的颗粒无机碳（光学和化学测量）。在E. huxleyi水华，而最高的粒子散射发生在相邻的原甲藻。颗石藻的后向散射占沿E主轴沿着总后向散射（有机和无机粒子）的50%。赫胥黎布鲁姆。颗石藻水华中的叶绿素特异性吸收是海洋浮游植物的典型特征。残留硝酸盐与温度的关系曲线表明，E.赫胥黎水华与5°C至15°C之间的沃茨有关，硅酸盐含量减少。结果表明，以前的下降的硅酸盐硅藻发生之前的denneE。赫胥黎花在巴塔哥尼亚大陆架上盛开。我们推测，这样的条件也可能是更广泛的大方解石带和其他颗石藻花的年度发展的重要。
We report surface observations of a mesoscale coccolithophore bloom at the shelf break of the Patagonian Shelf during December 2008, representing the densest coccolithophore population in the Southern Ocean. The bloom was most intense within the Falklands Current, northeast of the Falkland Islands. Emiliania huxleyi dominated bloom waters, with a mixed E. huxleyi and Prorocentrum sp. dinoflagellate bloom to the west and mixed assemblage of diatoms, dinoflagellates, and flagellates to the east. Optical measurements of coccolith light scattering, analytical measurements of their calcite, and microscopic counts all showed this to be an intense coccolithophore bloom. Average particulate inorganic carbon per coccolith in the bloom was low, typical of the B coccolith morphotype and in agreement with independent measurements made by scanning electron microscopy. Highest particulate inorganic carbon (measured optically and chemically) was observed when residual nitrate (defined as the difference, [NO3−1] − [Si(OH)4]) was 10–17 µmol L−1 and nitrate to phosphate ratios were close to Redfield values. Elevated particle backscattering was observed in the E. huxleyi bloom, whereas the highest particle scattering occurred in the adjoining Prorocentrum sp. bloom. Backscattering from coccolithophores represented up to 50% of the total backscattering (from organic and inorganic particles) along the main axis of the E. huxleyi bloom. Chlorophyll‐specific absorption in the coccolithophore bloom was typical of marine phytoplankton. Residual nitrate plotted vs. temperature showed that the E. huxleyi bloom was associated with waters between 5°C and 15°C, with depleted silicate. Results suggest that previous drawdown of silicate by diatoms occurred prior to the densest E. huxleyi blooms over the Patagonian Shelf. We speculate that such conditions might also be important for annual development of the broader Great Calcite Belt and other coccolithophore blooms..