Zooplankton abundance and size structure in the North Atlantic from MSM26_131-11

Data on zooplankton abundance and biovolume were collected in concert with data on the biophysical environment at 9 stations in the North Atlantic, from the Iceland Basin in the East to the Labrador Sea in the West. The data were sampled along vertical profiles 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) and a fluorescence sensor (F, ECO Puck chlorophyll a fluorometer, WET Labs 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, see 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). Fluorescence was roughly converted into chlorophyll based on filtered chlorophyll values obtained from station 10 in the Labrador Sea. Due to the low number of filtered samples that was used for the conversion the resulting chlorophyll values should be considered with care. 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, see 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9个站位的浮游动物丰度与生物体积数据，同步获取了对应站位的生物物理环境数据，站位范围东起冰岛盆地、西至拉布拉多海。数据沿垂直剖面采集，所用设备包括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，加拿大劳斯莱斯有限公司制造）、温盐深传感器（Conductivity-Temperature-Depth，CTD，型号SBE19plusV2，美国海鸟电子公司）以及荧光传感器（F，ECO Puck叶绿素a荧光计，美国WET实验室公司）。基于LOPC的原始数据，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）。随后将LOPC数据按照相等的log₁₀(个体体积)增量划分为49个粒径组，具体方法参见Edvardsen等人2002年的研究（doi:10.3354/meps227205）。LOPC数据的质量控制流程参照Basedow等人2013年的研究方法（doi:10.1016/j.pocean.2012.10.005）。基于从拉布拉多海10号站位获取的过滤叶绿素实测值，将荧光信号粗略转换为叶绿素浓度。由于用于转换的过滤样本量有限，因此对由此得到的叶绿素浓度数据需谨慎采用。对CTD数据进行异常值（超出量程范围）筛查，随后将其平均频率匹配至与LOPC数据一致的2赫兹。所有数据均通过基于Python编程语言定制开发的脚本完成处理。LOPC是一款光学仪器，用于计数并测量水柱中的颗粒物（等效球形直径范围为0.1至30毫米），相关说明参见Herman等人2004年的研究（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（匿名作者，2006年），详细推导过程可参见Checkley等人2008年（doi:10.4319/lo.2008.53.5_part_2.2123）与Gaardsted等人2010年（doi:10.1111/j.1365-2419.2010.00558.x）的研究文献。