Zooplankton abundance and size structure in the North Atlantic from M87/1_615-1

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).本数据集采集了北大西洋4个站位春季浮游植物水华发育过程中的浮游动物丰度与生物体积数据，同步配套了生物物理环境观测数据。冰岛海盆1号站位共开展4次巡航采样（3月26日、4月8日、4月18日、4月27日），挪威海南部2号站位共3次（3月30日、4月13日、4月23日），北海3号站位共2次（4月2日、4月15日），另有1个中间站位仅采样1次。数据采集采用加拿大罗尔斯·罗伊斯有限公司（Rolls Royce Canada Ltd.）生产的激光光学浮游生物计数器（Laser Optical Plankton Counter，LOPC），该设备与美国西毕电子有限公司（Seabird Electronics, Inc.）生产的电导-温度-深度传感器（Conductivity-Temperature-Depth sensor，CTD，型号SBE19plusV2）一同搭载于旋转式采水器上。基于LOPC采集数据，参照《LOPC软件操作手册》[匿名作者，2006，http://www.brooke-ocean.com/index.html]中的方法，计算得到浮游动物丰度（单位：个/立方米）与生物体积（单位：立方毫米/立方米）。将LOPC原始数据按以log₁₀(个体体积)为等间隔的方式划分为49个粒径组[Edvardsen等，2002，doi:10.3354/meps227205]。LOPC数据质量控制参照Basedow等（2013，doi:10.1016/j.pocean.2012.10.005）中的方法开展。对CTD数据进行异常值（超出量程范围）筛查，随后将其平均频率调整至与LOPC数据一致的2赫兹。所有数据均通过Python编程语言编写的专用脚本完成处理。LOPC是一款用于水体中颗粒物计数与粒径测量的光学仪器，可检测等效球形直径0.1~30毫米的颗粒[Herman等，2004，doi:10.1093/plankt/fbh095]。颗粒物等效球形直径（Equivalent Spherical Diameter，ESD）的计算方法参照操作手册[匿名作者，2006]，详细推导过程可参见Checkley等（2008，doi:10.4319/lo.2008.53.5_part_2.2123）与Gaardsted等（2010，doi:10.1111/j.1365-2419.2010.00558.x）。