Zooplankton abundance and size structure in the North Atlantic from M87/1_633-1

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次开展作业（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3次作业（3月30日、4月13日、4月23日），北海的3号站位2次作业（4月2日、4月15日），另有1个中间站位仅作业1次。数据由搭载于旋转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）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。基于LOPC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）。随后将LOPC数据按等log₁₀（体体积）增量划分为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）值筛查后，将其平均至与LOPC数据相同的采样频率（2赫兹）。所有数据均通过专门编写的Python编程语言脚本完成处理。LOPC是一款用于计数并测量水柱中颗粒物（等效球形直径0.1~30毫米）的光学仪器（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）。