Zooplankton abundance and size structure in the North Atlantic from M87/1_494-1

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，同时配套采集了生物物理环境相关数据。其中冰岛海盆的1号站位先后4次开展采样（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个中间站位仅采样1次。数据由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）与电导率-温度-深度传感器（Conductivity-Temperature-Depth，CTD，型号SBE19plusV2，美国海鸟电子公司）共同采集，二者均搭载于旋转式采水器。基于LOPC采集的数据，按照LOPC软件操作手册（匿名作者，2006年，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）为等步长的方式划分为49个粒径组（Edvardsen等，2002，doi:10.3354/meps227205）。LOPC数据的质量控制参照Basedow等（2013，doi:10.1016/j.pocean.2012.10.005）的方法开展。对CTD数据进行异常（超量程）值筛查，并将其平均频率统一至与LOPC数据一致的2赫兹。所有数据均通过Python编程语言编写的定制脚本完成处理。LOPC是一款用于计数并测量水柱中粒径范围为0.1至30毫米等效球形直径（equivalent spherical diameter，ESD）的颗粒的光学仪器（Herman等，2004；doi:10.1093/plankt/fbh095）。颗粒等效球形直径（ESD）的计算方法参照操作手册（匿名作者，2006年），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）的研究。