Zooplankton abundance and size structure in the North Atlantic from M87/1_567-1

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，同时配套采集了生物物理环境相关数据。冰岛海盆的1号站位共开展4次调查（3月26日、4月8日、4月18日、4月27日），挪威海南部的2号站位共3次调查（3月30日、4月13日、4月23日），北海的3号站位共2次调查（4月2日、4月15日），另有1个中间站位仅开展1次调查。数据由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，该设备与温盐深传感器（Conductivity-Temperature-Depth，CTD，型号SBE19plusV2，美国Seabird Electronics公司）一同安装在转盘式采水器上。基于LOPC采集的数据，按照LOPC软件操作手册（Anonymous, 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）。LOPC数据被重新划分为49个尺寸组，每组的体积极数（log₁₀）增量相等（Edvardsen等, 2002, doi:10.3354/meps227205）。LOPC数据的质量控制流程参照Basedow等（2013, doi:10.1016/j.pocean.2012.10.005）中的方法执行。对CTD数据进行异常值（超出量程范围）筛查，随后将其平均至与LOPC数据一致的采样频率（2赫兹）。所有数据均通过基于Python编程语言开发的专属脚本完成处理。LOPC是一款光学仪器，用于计数并测量水柱中粒径范围为0.1至30毫米的等效球形直径颗粒物（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（Anonymous, 2006），详细推导过程可见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）。