Global distributions of diazotrophs abundance and biomass - Depth integrated values computed from a collection of source datasets - Contribution to the MAREDAT World Ocean Atlas of Plankton Functional Types

The MAREDAT atlas covers 11 types of plankton, ranging in size from bacteria to jellyfish. Together, these plankton groups determine the health and productivity of the global ocean and play a vital role in the global carbon cycle. Working within a uniform and consistent spatial and depth grid (map) of the global ocean, the researchers compiled thousands and tens of thousands of data points to identify regions of plankton abundance and scarcity as well as areas of data abundance and scarcity. At many of the grid points, the MAREDAT team accomplished the difficult conversion from abundance (numbers of organisms) to biomass (carbon mass of organisms). The MAREDAT atlas provides an unprecedented global data set for ecological and biochemical analysis and modeling as well as a clear mandate for compiling additional existing data and for focusing future data gathering efforts on key groups in key areas of the ocean.
The present data set presents depth integrated values of diazotrophs abundance and biomass, computed from a collection of source data sets.

MAREDAT图集（MAREDAT atlas）涵盖11类浮游生物（plankton），体型跨度涵盖细菌至水母。这些浮游生物类群共同决定了全球海洋的健康状况与生产力，并在全球碳循环中发挥至关重要的作用。研究团队以全球海洋统一规范的空间与深度网格（地图）为基础，整合了数千乃至数万条数据记录，以此精准识别浮游生物丰沛与匮乏的海域，同时标注出数据充足与不足的区域。在诸多网格点位上，MAREDAT研究团队完成了从生物丰度（生物体个体数量）到生物量（生物体碳质量）的高难度转换。MAREDAT图集为生态学与生物化学分析及建模提供了前所未有的全球数据集，同时明确了两项核心任务：一是整合更多现有数据，二是将未来的数据采集工作聚焦于海洋关键区域的关键类群。
本数据集给出了固氮生物（diazotrophs）的丰度与生物量深度积分值，该值基于多套源数据集计算得到。