Zooplankton abundance and size structure in the North Atlantic from M87/1_435-1

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期间的浮游动物丰度与生物体积数据，同时同步获取了对应海域的生物物理环境参数。其中冰岛海盆1号站位分别于3月26日、4月8日、4月18日、4月27日共开展4次采样；挪威海南部2号站位于3月30日、4月13日、4月23日共开展3次采样；北海3号站位于4月2日、4月15日共开展2次采样；另有1个中间站位仅开展1次采样。数据由搭载于旋转架式采水器的激光光学浮游生物计数器（Laser Optical Plankton Counter, LOPC，加拿大罗尔斯·罗伊斯有限公司）采集，该设备同步搭载了电导-温度-深度传感器（Conductivity-Temperature-Depth, CTD，型号SBE19plusV2，美国Seabird Electronics公司）。依据LOPC软件操作手册[(Anonymous, 2006), http://www.brooke-ocean.com/index.html]中的方法，基于LOPC数据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）。LOPC数据被重分组为49个尺寸组，各组以相等的log₁₀(体体积)间隔划分(Edvardsen等, 2002, doi:10.3354/meps227205)。LOPC数据的质量检查参照Basedow等(2013, doi:10.1016/j.pocean.2012.10.005)中的方法执行。CTD数据先筛查出超出量程的异常值，随后将其平均频率调整至与LOPC数据一致的2 Hz。所有数据均通过专为本次研究开发的Python语言脚本完成处理。LOPC是一款专用光学仪器，用于计数并测量水柱中粒径范围为0.1~30 mm的等效球形直径颗粒(Herman等, 2004; doi:10.1093/plankt/fbh095)。颗粒等效球形直径（Equivalent Spherical Diameter, ESD）的计算方法参照操作手册(Anonymous, 2006)，相关细节可参考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)。