Global oceanic diazotroph database version 2 and elevated estimate of global oceanic N 2 fixation

作者：Zhibo Shao, Yangchun Xu, Hua Wang, Weicheng Luo, Lice Wang, Yuhong Huang, Nona S. R. Agawin, Ayaz Ahmed, Mar Benavides, Mikkel Bentzon‐Tilia, Ilana Berman‐Frank, Hugo Berthelot, Isabelle C. Biegala, Mariana B. Bif, Antonio Bode, Sophie Bonnet, Deborah A. Bronk, Mark V. Brown, Lisa Campbell, Douglas G. Capone, Edward J. Carpenter, Nicolas Cassar, Bonnie X. Chang, Dreux Chappell, Yuh-ling Lee Chen, Matthew J. Church, Francisco M. Cornejo‐Castillo, Amália Maria Sacilotto Detoni, Scott C. Doney, Cécile Dupouy, Marta Estrada, Camila Fernández, Bieito Fernández Castro, Debany Fonseca-Batista, Rachel A. Foster, Ken Furuya, Nicole Garcia, Kanji Goto, Jesús Gago, Mary R. Gradoville, M. Robert Hamersley, Britt A. Henke, Cora Hörstmann, Amal Jayakumar, Zhibing Jiang, Shuh‐Ji Kao, David M. Karl, Leila Kittu, Angela N. Knapp, Sanjeev Kumar, Julie LaRoche, Hongbin Liu, Jiaxing Liu, Caroline Lory, Carolin R. Löscher, Emilio Marañón, Lauren F. Messer, Matthew M. Mills, Wiebke Mohr, Pia H. Moisander, Claire Mahaffey, Robert M. Moore, Beatriz Mouriño‐Carballido, Margaret R. Mulholland, Shin‐Ichiro Nakaoka, Joseph A. Needoba, Eric J. Raes, Eyal Rahav, Teodoro Ramı́rez, Christian Furbo Reeder, Lasse Riemann, Virginie Riou, Julie Robidart, V. V. S. S. Sarma, Takuya Sato, Himanshu Saxena, Corday R. Selden, Justin R. Seymour, Dalin Shi, Takuhei Shiozaki, Arvind Singh, Rachel E. Sipler, Jun Sun, Koji Suzuki, Kazutaka Takahashi, Yehui Tan, Weiyi Tang, Jean‐Éric Tremblay, Kendra A. Turk‐Kubo, Zuozhu Wen, Angelicque White, Samuel T. Wilson, Takashi Yoshida, Jonathan P. Zehr, Run Zhang, Yao Zhang, Ya‐Wei Luo · 发表于：Earth system science data · 年份：2023 · DOI：10.5194/essd-15-3673-2023 · 被引用次数：69 · 研究领域：Marine and coastal ecosystems、Methane Hydrates and Related Phenomena、Atmospheric and Environmental Gas Dynamics

Marine diazotrophs convert dinitrogen (N 2 ) gas into bioavailable nitrogen (N), supporting life in the global ocean. In 2012, the first version of the global oceanic diazotroph database (version 1) was published. Here, we present an updated version of the database (version 2), significantly increasing the number of in situ diazotrophic measurements from 13 565 to 55 286. Data points for N 2 fixation rates, diazotrophic cell abundance, and nifH gene copy abundance have increased by 184 %, 86 %, and 809 %, respectively. Version 2 includes two new data sheets for the nifH gene copy abundance of non-cyanobacterial diazotrophs and cell-specific N 2 fixation rates. The measurements of N 2 fixation rates approximately follow a log-normal distribution in both version 1 and version 2. However, version 2 considerably extends both the left and right tails of the distribution. Consequently, when estimating global oceanic N 2 fixation rates using the geometric means of different ocean basins, version 1 and version 2 yield similar rates (43–57 versus 45–63 Tg N yr −1 ; ranges based on one geometric standard error). In contrast, when using arithmetic means, version 2 suggests a significantly higher rate of 223±30 Tg N yr −1 (mean ± standard error; same hereafter) compared to version 1 (74±7 Tg N yr −1 ). Specifically, substantial rate increases are estimated for the South Pacific Ocean (88±23 versus 20±2 Tg N yr −1 ), primarily driven by measurements in the southwestern subtropics, and for...