Spring coccolithophore production and dispersion in the temperate eastern North Atlantic Ocean
Spring coccolithophore production and dispersion in the temperate eastern North Atlantic Ocean
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北大西洋温带东部春季颗石藻的生产和扩散
DOI：
10.1029/2010jc006841
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发表时间：
2011
影响因子：
--
通讯作者：
H. Thierstein
中科院分区：
文献类型：
--
作者：
R. Schiebel;U. Brupbacher;S. Schmidtko;G. Nausch;J. Waniek;H. Thierstein
颗石藻的生产和分散在其生态和水文背景下，整个增强春季叶绿素生产在北大西洋东部的表面进行评估。在2004年3月12日至16日的4天内，沿沿着西经20度从北纬47度至北纬33度的南北向样带取样。从定义的深度下降到200米的水样进行了分析coccolithophores从0.45 μ m聚碳酸酯过滤器扫描电子显微镜。在47度N颗石藻蓬勃发展时，真光条件允许新的生产在深混合，低温，高营养浓度。在浮游植物演替的早期阶段，Emiliania huxleyi在高湍流下繁荣，占总颗石藻组合的一半，当在水柱的上部200 m处整合时，其细胞数高达150 x 10（3）个L（-1）和12 x 10（9）个m（-2）。叶绿素浓度最大值出现在亚速尔群岛锋面以北，北纬37度至39度，颗石藻数量相对较少。在35 ° N-33 ° N的南部，在平静和分层的亚热带模式沃茨中，颗石藻是丰富的，E。huxleyi再次成为优势种。虽然在这里观察到的颗石藻细胞密度仍然低于那些典型的浮游生物从卫星图像可见的水华，深度集成的总质量使他们显着的方解石生产者和贡献者的总碳沉降在一个更广泛的生态条件在冬末春初比迄今为止假设。
Production and dispersion of coccolithophores are assessed within their ecologic and hydrographic context across enhanced spring chlorophyll production in the surface eastern North Atlantic. Within a 4 day period from 12 to 16 March 2004, a N-S transect from 47 degrees N to 33 degrees N was sampled along 20 degrees W. Water samples from defined depths down to 200 m were analyzed for coccolithophores from 0.45 mu m polycarbonate filters by scanning electron microscopy. At 47 degrees N coccolithophores flourished when euphotic conditions allowed new production at deep mixing, low temperatures, and high nutrient concentrations. Emiliania huxleyi flourished at high turbulence during an early stage of the phytoplankton succession and contributed half of the total coccolithophore assemblage, with up to 150 x 10(3) cells L(-1) and up to 12 x 10(9) cells m(-2) when integrated over the upper 200 m of the water column. Maximum chlorophyll concentrations occurred just north of the Azores Front, at 37 degrees N-39 degrees N, at comparatively low numbers of coccolithophores. To the south, at 35 degrees N-33 degrees N, coccolithophores were abundant within calm and stratified Subtropical Mode Waters, and E. huxleyi was the dominant species again. Although the cell densities of coccolithophores observed here remained below those typical of plankton blooms visible from satellite images, the depth-integrated total mass makes them significant producers of calcite and contributors to the total carbon sedimentation at a much wider range of ecological conditions during late winter and early spring than hitherto assumed.