Porewater concentrations of nitrate, nitrite, ammonium, manganese, and iron in sediments from the Atacama and Kermadec Trench regions

<p>The file presents data collected during&nbsp;cruises on&nbsp;<em>RV&nbsp;</em>Tangaroa<em>&nbsp;</em>(TAN1711, 2017) to the Kermadec Trench and&nbsp;<em>RV</em>&nbsp;Sonne (SO261, 2018) to the Atacama Trench. Sample collection and analyses are described, and results are discussed in Thamdrup, B. et al. Anammox bacteria drive fixed nitrogen loss in hadal trench sediments<strong>.&nbsp;</strong>Proc. Natl. Acad. Sci. USA, in press, doi:&nbsp;10.1073/pnas.2104529118.</p>