Zooplankton abundance and size structure in the North Atlantic from M87/1_558-1

Data on zooplankton abundance and biovolume were collected in concert with data on the biophysical environment during the development of the phytoplankton spring bloom at 4 stations in the North Atlantic. Station 1 in the Icelandic Basin was visited four times (26 March, 8 April, 18 April, 27 April), Station 2 in the southern Norwegian Sea was visited three times (30 March, 13 April, 23 April), Station 3 in the North Sea was visited twice (2 April, 15 April) and one intermediate station was visited once. The data were sampled by a Laser Optical Plankton Counter (LOPC, Rolls Royce Canada Ltd.) that was mounted on a carousel water sampler together with a Conductivity-Temperature-Depth sensor (CTD, SBE19plusV2, Seabird Electronics, Inc., USA). Based on the LOPC data, abundance (individuals/m**3) and biovolume (mm3/m**3) were calculated as described in the LOPC Software Operation Manual [(Anonymous, 2006), http://www.brooke-ocean.com/index.html]. LOPC data were regrouped into 49 size groups of equal log10 (body volume) increments (Edvardsen et al., 2002, doi:10.3354/meps227205). LOPC data quality was checked as described in Basedow et al. (2013, doi:10.1016/j.pocean.2012.10.005). CTD data were screened for erroneous (out of range) values and then averaged to the same frequency as the LOPC data (2 Hz). All data were processed using especially developed scripts in the python programming language. The LOPC is an optical instrument designed to count and measure particles (0.1 to 30 mm equivalent spherical diameter) in the water column (Herman et al., 2004; doi:10.1093/plankt/fbh095). The size of particles as equivalent spherical diameter (ESD) was computed as described in the manual (Anonymous, 2006), and in more detail in Checkley et al. (2008, doi:10.4319/lo.2008.53.5_part_2.2123) and Gaardsted et al. (2010, doi:10.1111/j.1365-2419.2010.00558.x).

在北大西洋4个站位的浮游植物春季水华发生期间，同步采集了浮游动物丰度、生物体积数据及生物物理环境数据。冰岛海盆的1号站位共采样4次（3月26日、4月8日、4月18日、4月27日），挪威海南部的2号站位采样3次（3月30日、4月13日、4月23日），北海的3号站位采样2次（4月2日、4月15日），另有1个中间站位采样1次。数据由安装在转盘式采水器上的激光光学浮游生物计数器（Laser Optical Plankton Counter，LOPC，加拿大劳斯莱斯有限公司）采集，同时搭载的还有温盐深传感器（Conductivity-Temperature-Depth sensor，CTD，型号SBE19plusV2，美国Seabird电子公司）。基于LOPC数据，浮游动物丰度（个/立方米）及生物体积（立方毫米/立方米）的计算方法参照《LOPC软件操作手册》[(Anonymous, 2006), http://www.brooke-ocean.com/index.html]。LOPC数据按生物体积的对数10增量划分为49个等距大小组（Edvardsen等，2002，doi:10.3354/meps227205）。LOPC数据质量核查方法参照Basedow等（2013，doi:10.1016/j.pocean.2012.10.005）。CTD数据先筛选出错误（超出范围）值，再平均至与LOPC数据相同的频率（2赫兹）。所有数据均使用专门开发的Python编程语言脚本进行处理。LOPC是一种光学仪器，用于计数和测量水体中粒径为0.1至30毫米等效球直径的颗粒物（Herman等，2004；doi:10.1093/plankt/fbh095）。颗粒物的等效球直径（equivalent spherical diameter，ESD）计算方法参照上述手册（Anonymous, 2006），更详细的说明见Checkley等（2008，doi:10.4319/lo.2008.53.5_part_2.2123）及Gaardsted等（2010，doi:10.1111/j.1365-2419.2010.00558.x）。