Zooplankton abundance and size structure in the North Atlantic from MSM26_134-16

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，并同步获取了对应站位的生物物理环境参数；站位分布范围东起冰岛盆地，西至拉布拉多海。数据通过垂直剖面采样获取，所用设备为安装于旋转架采水器上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（Rolls Royce Canada Ltd.）），配套设备包括温盐深传感器（Conductivity-Temperature-Depth, CTD，型号SBE19plusV2，美国Seabird电子有限公司（Seabird Electronics, Inc., USA））与荧光传感器（F，ECO Puck叶绿素a荧光计，美国WET实验室有限公司（WET Labs Inc., USA））。基于LOPC采集的数据，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：ind./m³）与生物体积（单位：mm³/m³）。将LOPC数据按体体积的log₁₀值均等增量划分为49个尺寸组，具体方法参见Edvardsen等人（2002年，doi:10.3354/meps227205）的研究。LOPC数据的质量控制参照Basedow等人（2013年，doi:10.1016/j.pocean.2012.10.005）的方法执行。基于从拉布拉多海10号站位获取的过滤叶绿素数据，将荧光值粗略转换为叶绿素浓度；由于用于转换的过滤样品数量较少，对最终得到的叶绿素浓度数据需谨慎使用。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 Hz。所有数据均通过使用Python编程语言编写的专属脚本完成处理。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 mm）的光学仪器，相关说明参见Herman等人（2004年，doi:10.1093/plankt/fbh095）的研究。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。