Zooplankton abundance and size structure in the North Atlantic from M87/1_665-1

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，并同步采集了对应站位的生物物理环境数据。其中冰岛海盆1号站位先后开展4次采样（3月26日、4月8日、4月18日、4月27日）；挪威海南部2号站位开展3次采样（3月30日、4月13日、4月23日）；北海3号站位开展2次采样（4月2日、4月15日）；另有1个中间站位仅开展1次采样。数据由搭载于旋转式水样采集器的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 sensor, CTD，型号SBE19plusV2，美国Seabird Electronics, Inc.）共同采集。基于LOPC数据，参照《LOPC软件操作手册》[(佚名, 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数据按体体积的等对数10增量划分为49个尺寸分组（Edvardsen et al., 2002, doi:10.3354/meps227205）。LOPC数据的质量检查参照Basedow et al. (2013, doi:10.1016/j.pocean.2012.10.005)中的流程完成。对CTD数据先筛查超出合理范围的错误值，再将其平均频率调整至与LOPC数据一致（2赫兹）。所有数据均采用Python编程语言编写的专用脚本完成处理。LOPC是一款光学仪器，用于计数并测量水柱中等效球形直径0.1~30 mm的颗粒物（Herman et al., 2004; doi:10.1093/plankt/fbh095）。颗粒物等效球形直径（Equivalent Spherical Diameter, ESD）的计算方法参照上述操作手册[(佚名, 2006), http://www.brooke-ocean.com/index.html]，并在Checkley et al. (2008, doi:10.4319/lo.2008.53.5_part_2.2123)与Gaardsted et al. (2010, doi:10.1111/j.1365-2419.2010.00558.x)中进行了详细阐述。