Zooplankton abundance and size structure in the North Atlantic from MSM26_132-1

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，同步获取了其生物物理环境参数；站位范围东起冰岛海盆，西至拉布拉多海。数据通过激光光学浮游生物计数器（Laser Optical Plankton Counter，LOPC，劳斯莱斯加拿大有限公司）沿垂直剖面采集，该设备与传导温深传感器（Conductivity-Temperature-Depth sensor，CTD，型号SBE19plusV2，美国Seabird Electronics公司）及荧光传感器（F，ECO Puck叶绿素a荧光计，美国WET Labs公司）一同安装在旋转式采水器上。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：ind./m³）与生物体积（单位：mm³/m³）。将LOPC数据按以log₁₀(个体体积)为等步长的方式重分组为49个尺寸组别，详情参见Edvardsen等人(2002, doi:10.3354/meps227205)。LOPC数据的质量质控流程参照Basedow等人(2013, doi:10.1016/j.pocean.2012.10.005)中的方法执行。依据从拉布拉多海10号站位获取的过滤叶绿素数据，将荧光值近似转换为叶绿素浓度。由于用于转换的过滤样本量较少，所得叶绿素浓度数据需谨慎使用。对CTD数据进行异常（超量程）值筛查，随后将其平均至与LOPC数据相同的采样频率（2 Hz）。所有数据均通过基于Python编程语言编写的专属脚本完成处理。LOPC是一款用于水体中颗粒物（等效球形直径0.1~30 mm）计数与粒径测量的光学仪器，详情参见Herman等人(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)]，详细推导过程可参见Checkley等人(2008, doi:10.4319/lo.2008.53.5_part_2.2123)与Gaardsted等人(2010, doi:10.1111/j.1365-2419.2010.00558.x)。