Abundance of microbial bacteria and phytoplankton through the water column during the AMT29 (DY110) cruise in October-November 2019.

This dataset contains depth profiles of the mean abundance of microbial bacteria, cyanobacteria and small (&lt;20 um) phytoplankton reported in cells per millilitre. Samples were measured using flow cytometry during the Atlantic Meridional Transect (AMT) cruise AMT29 (DY110). The samples were collected between October and November 2019 from 200 m to the surface, using a Seabird CTD system with a rosette of 24 Niskin bottles of 20 L volume. Samples were collected from the predawn and noon CTDs and were stored in a refrigerator and analysed within 3 hours of collection. In total 820 discrete samples were analysed and quantified using a Becton Dickinson FACSort flow cytometer which characterised and enumerated <em>Prochlorococcus</em> sp. and <em>Synechococcus</em> sp. (cyanobacteria), pico- and eukaryotic phytoplankton and microbial bacteria based on their light scattering and autofluorescence properties. Data were analysed onboard the ship during the cruise.

本数据集包含微生物细菌、蓝细菌以及小型（<20 μm）浮游植物的平均丰度深度剖面数据，单位为细胞每毫升。样本于大西洋经向断面巡航（Atlantic Meridional Transect, AMT）的AMT29（DY110）航次中，采用流式细胞术（flow cytometry）完成检测。样本采集于2019年10月至11月期间，采集深度范围为200米至表层海水，所用设备为Seabird CTD系统，该系统搭载由24个容积20升的尼斯金采水器（Niskin bottles）组成的采水架。样本分别于黎明前和正午的CTD采水站位采集，采集后储存于冰箱，并在采样后3小时内完成分析。总计对820个离散样本进行了分析与定量，所用仪器为贝克顿-迪金森（Becton Dickinson）FACSort流式细胞仪，该仪器基于光散射与自发荧光特性，对原绿球藻属（*Prochlorococcus*）、聚球藻属（*Synechococcus*）蓝细菌、超微型及真核浮游植物与微生物细菌完成鉴定与计数。所有数据均在航次期间于船上完成分析。